Physicochemical and Mineralogical Characterization of Uranium-Contaminated Soils

Physicochemical and mineralogical properties of the contaminants should be taken into account to decide a remediation strategy for a given radionuclide because development and optimization of soil remedial technologies are based on physicochemical and mineralogical separation techniques. The objectives of this study are to (1) demonstrate how a priori physicochemical and mineralogical characterization of soil contaminants can direct the development of remediation strategies and their performance evaluation for soil treatments and (2) understand the nature of uranium contamination and its association with the soil matrix by chemical extractions. This study examined two U-contaminated sites (K311 and K1300) at the DOE K-25 site, presently located at East Tennessee Technology Park, Oak Ridge, Tennessee. Uranium concentrations of the soils ranged from 1499 to 216,413 Bq kg^?1 at both sites. Scanning electron microscopy with backscattered electron spectroscopy and X-ray diffraction analysis showed that the dominant U phases are U oxides (schoepite), U-Ca-silicate (uranophane) and U silicate (coffinite) from the K311 site soils, whereas U-Ca-oxide and U-Ca-phosphate dominate in the K1300 site soils. Sodium carbonate/bicarbonate leaching was effective on the K1300 site soils, whereas citric acid leaching is effective on the K311 site soils. Sequential leaching showed that the majority of the uranium in the contaminated soils was contained in carbonate minerals (45%) and iron oxides (40%). Conventional leaching showed that citric acid treatment was most effective on the K311 site soils, whereas the sodium carbonate/ bicarbonate treatment was most effective on the K1300 site soils.     

Acid-Generating and Leaching Potential of Soils in a Coal Waste Rock Pile in Northeastern China

The present study involved the assessment of potential generation of acid drainage and also metal leaching from an abandoned large (175 m) low sulfur waste rock pile—the dominant mine waste at the site—at the Haizhou coal mine. Laboratory-based static and column leaching tests on waste rock samples were conducted. The static tests were done for 8 composite samples collected from different parts of pile. A column study was performed using mixture of waste rock soil samples to assess metals attenuation process of background soils in vicinity of pile when rainwater reacts with low-sulfide waste rocks. Total concentration of major elements in solid samples was determined using dispersive X-ray fluorescence spectrometry (XRF) and chemical analysis of leachate were measured by inductively coupled plasma optical emission spectrometry (ICP-OES), ion chromatography and titration methods. The inverse geochemical modeling using PHREEQC was applied to explain possible mass transfer processes between column leachates of waste pile and background soils. Static tests (including acid–base accounting (ABA) and net acid generation (NAG)) and mineralogical information suggest that the waste rock is non-acid generating. The large amount of aluminosilicate minerals and probably trace amounts of carbonates with respect to low sulfur content of waste rock pile represents a potentially large source of neutralization potential according to static test results. It was also found that presence of inherent neutralizing materials in waste rock and also in surrounding background soils provide sufficient neutrality and possibly immobilize the trace and heavy metal contents of waste rocks and potentially protects water resources.     

Comparison of Extractants for Removing Heavy Metals from Contaminated Clayey Soils

This article describes the removal of heavy metals from contaminated clayey soils by soil washing using various extractants. Two clayey soils, kaolin, a low buffering soil with pH of 5, and glacial till, a high buffering soil with pH of 8, were used to represent various soil conditions. These soils were spiked with chromium (Cr), nickel (Ni), and cadmium (Cd) to simulate improper disposal of typical electroplating waste constituents. The following extracting solutions were investigated for the removal of heavy metals from the soils: deionized water, distilled water, and tap water; acetic acid and phosphoric acid; chelating agents ethylenediaminetetraacetic acid (EDTA) and citric acid; and the oxidizing agents potassium permanganate and hydrogen peroxide. The effect of extractant concentration on removal of heavy metals was also investigated. Complete removal of Cr was achieved using 0.1?M potassium permanganate for kaolin, while a maximum of 54% was removed from glacial till. A maximum Ni removal of 80% was achieved using tapwater for kaolin, while a maximum removal of 48 to 52% was achieved using either 1?M acetic acid or 0.1?M citric acid for glacial till. A maximum Cd removal of 50% was achieved using any of the extractants for kaolin, while a maximum removal of 45 to 48% was obtained using either acids or chelating agents for glacial till. Overall, this study showed that complete removal of Cr, Ni, and Cd from clayey soils is difficult to achieve using the soil-washing process, and also the use of one extractant may not be effective in removing all metals. A sequential extraction using different extractants may be needed for the removal of multiple metal contaminants from clayey soils.     

Mineralogy of the rhizosphere in forest soils of the eastern United States

Chemical and mineralogical studies of forest soils from six sites in the northeastern and southeastern United States indicate that soil in the immediate vicinity of roots and fine root masses may show marked differences in physical characteristics, mineralogy and weathering compared to the bulk of the forest soil. Examination of rhizosphere and rhizoplane soils revealed that mineral grains within these zones are affected mechanically, chemically and mineralogically by the invading root bodies. In SEM/EDS analyses, phyllosilicate grains adjacent to roots commonly aligned with their long axis tangential to the root surface. Numerous mineral grains were also observed for which the edge abutting a root surface was significantly more fractured than the rest of the grain. Both the alignment and fracturing of mineral grains by growing roots may influence pedogenic processes within the rhizosphere by exposing more mineral surface to weathering in the root-zone microenvironment. Chemical interactions between roots and rhizosphere minerals included precipitation of amorphous aluminium oxides, opaline and amorphous silica, and calcium oxalate within the cells of mature roots and possible preferential dissolution of mineral grains adjacent to root bodies. Mineralogical analyses using X-ray diffraction (XRD) techniques indicated that kaolin minerals in some rhizosphere samples had a higher thermal stability than kaolin in the surrounding bulk forest soil. In addition, XRD analyses of clay minerals from one of the southeastern sites showed abundant muscovite in rhizoplane soil adhering to root surfaces whereas both muscovite and degraded mica were present in the immediately surrounding rhizosphere soil. This difference in mineral assemblages may be due to either K-enrichment in rhizoplane soil solutions or the preferential dissolution of biotite at the root-soil interface     

不同pH值土壤及其浸提液对羊草种子萌发和幼苗生长的影响

研究了不同pH值土壤以及重度盐碱土和非盐碱土浸提液对羊草(Leymus chinensis)种子萌发及幼苗生长的影响。不同pH值土壤由配土和调酸两种方式取得,前者由重度盐碱土(pH=10．24)与非盐碱土(pH=7．49)按不同比例配制,后者是由重度苏打盐碱土经硫酸调酸处理得到。配土发芽的实验结果表明,当pH值在7．49-9．14时,种子的发芽率均在50％以上,且幼苗能够正常生长;pH=9．53时,羊草种子的发芽率低于50％,仅部分幼苗个体能够成活;当pH>9．86时,幼苗在萌发后50天左右全部枯死。说明羊草种子个体萌发期最大耐受pH值在9．14-9．53之间。重度苏打盐碱土调酸发芽实验结果表明,当调酸后的土壤pH值降至7．0-10．0时,均能显著促进羊草种子的萌发,且幼苗生长正常。确定了羊草种子萌发的最适pH值为8．0-8．5。土／水比为1:1的非盐碱土浸提液能够显著提高羊草种子发芽率,而重度苏打盐碱土浸提液对羊草种子萌发没有产生显著抑制。     

Preparation and properties of a double-coated slow-release NPK compound fertilizer with superabsorbent and water-retention

A double-coated slow-release NPK compound fertilizer with superabsorbent and water-retention was prepared by crosslinked poly(acrylic acid)/diatomite - containing urea (the outer coating), chitosan (the inner coating), and water-soluble granular fertilizer NPK (the core). The effects of the amount of crosslinker, initiator, degree of neutralization of acrylic acid, initial monomer and diatomite concentration on water absorbency were investigated and optimized. The water absorbency of the product was 75 times its own weight if it was allowed to swell in tap water at room temperature for 2 h. Atomic absorption spectrophotometer and element analysis results showed that the product contained 8.47% potassium (shown by K(2)O), 8.51% phosphorus (shown by P(2)O(5)), and 15.77% nitrogen. We also investigated the water-retention property of the product and the slow release behavior of N, P and K in the product. This product with excellent slow release and water-retention capacity, being nontoxic in soil and environment-friendly, could be especially useful in agricultural and horticultural applications.     

电子垃圾拆解地区土壤和植物中邻苯二甲酸酯分布特征

近年来,电子垃圾不当拆解带来的环境问题引起国际社会的极大关注.本研究对浙江省台州市不同电子垃圾拆解地区土壤和植物样品中5种邻苯二甲酸酯类（PAEs）污染物进行了测定分析.结果表明：土壤（以干质量计）中PAEs类污染物的浓度为12.566~46.669 mg·kg^-1,其中邻苯二甲酸二异辛酯（DEHP）、邻苯二甲酸二丁酯（DBP）和邻苯二甲酸二乙酯（DEP）相对含量较高,约占PAEs总量的94%以上.拆解地区蚕豆（Vicia faba L.）中PAEs总量明显高于同地区其他植物,且土壤和所有植物体内PAEs浓度相关性均不显著(P>0.05).与美国国家环保局制定的土壤PAEs治理标准比较,台州电子垃圾拆解地区土壤PAEs污染较为严重.     

Nitrogen deposition promotes the production of new fungal residues but retards the decomposition of old residues in forest soil fractions

Atmospheric nitrogen (N) deposition has frequently been observed to increase soil carbon (C) storage in forests, but the underlying mechanisms still remain unclear. Changes in microbial community composition and substrate use are hypothesized to be one of the key mechanisms affected by N inputs. Here, we investigated the effects of N deposition on amino sugars, which are used as biomarkers for fungal‐ and bacterial‐derived microbial residues in soil. We made use of a 4‐year combined CO₂ enrichment and N deposition experiment in model forest ecosystems, providing a distinct ¹³C signal for ‘new’ and ‘old’ C in soil organic matter and microbial residues measured in density and particle‐size fractions of soils. Our hypothesis was that N deposition decreases the amount of fungal residues in soils, with the new microbial residues being more strongly affected than old residues. The soil fractionation showed that organic matter and microbial residues are mainly stabilized by association with soil minerals in the heavy and fine fractions. Moreover, the bacterial residues are relatively enriched at mineral surfaces compared to fungal residues. The ¹³C tracing indicated a greater formation of fungal residues compared to bacterial residues after 4 years of experiment. In contradiction to our hypotheses, N deposition significantly increased the amount of new fungal residues in bulk soil and decreased the decomposition of old microbial residues associated with soil minerals. The preservation of old microbial residues could be due to decreased N limitation of microorganisms and therefore a reduced dependence on organic N sources. This mechanism might be especially important in fine heavy fractions with low C/N ratios, where microbial residues are effectively protected from decomposition by association with soil minerals.     

亚热带地区阔叶林与杉木林土壤活性有机质比较

通过对亚热带3个地区地带性阔叶林和杉木林土壤活性有机质的比较,分析森林类型变化及杉木连栽对土壤有机碳和养分含量的影响.结果表明：地带性阔叶林转变为杉木林后,土壤总有机碳含量下降27.8%～52.1%、腐殖酸碳下降32.2%～52.8%、胡敏酸下降36.4%～59.0%、富里酸下降29.7%～50.0%;杉木连栽也使土壤总有机碳和腐殖质含量下降.森林类型改变和杉木连栽对土壤活性有机质的影响更明显.杉木林取代阔叶林后,土壤微生物生物量碳、微生物生物量氮、可溶性有机碳和可溶性有机氮含量的最大降幅分别为61.8%、38.2%、43.3%和69.0%;与第1代杉木林相比,第2代杉木林土壤微生物生物量碳、微生物生物量氮、可溶性有机碳和可溶性有机氮含量的最大降幅分别为34.7%、29.3%、30.4%、18.4%.经相关性分析,除冷水浸提有机氮外,土壤活性有机质与养分含量之间具有密切的相关关系.     

Studies on Fractionation of Arsenic in Soil in Relation to Crop Uptake

Widespread arsenic (As) contamination in West Bengal and Bangladesh is of great concern as it affects millions of people due to its toxicity. Groundwater, when used for irrigation, helps entry of arsenic into the food chain via a soil-plant-animal continuum. In this study the extent of geo accumulation is measured in order to assess the degree of As contamination in soil. A sequential fractionation study of As revealed the concentration of different arsenic fractions in the order: As held at the internal surfaces of soil aggregates (20.7%) > freely exchangeable As (20.3%) > calcium associated As (18.7%) > chemisorbed As (17%) > residual As (15.7%) > labile As (3.29%). The variation in fractions may be attributed to the mineralogical make-up of soils along with some physicochemical factors. Statistical correlations and path analyses revealed that total and Olsen extractable arsenic (plant available arsenic) are dependent upon the As held at the internal surfaces of soil aggregates and chemisorbed arsenic fraction, which are directly influenced by the mineralogy of these experimental soils. The crop uptake by Kharif rice and mustard grown in these areas also corroborates the above fact. The poor reflection of exchangeable forms of soil arsenic in crop availability revealed that arsenic has undergone transformation via minerals through the continuous use of arsenic-laden water for irrigation.     

黄土区不同类型土壤可溶性有机氮的含量及特性

测定了黄土高原地区不同生态系统土壤中可溶性有机氮（SON）和游离氨基酸的含量,并分析了其与土壤其他性质之间的关系。结果表明,黑垆土、红油土和淋溶褐土中SON的平均含量分别为24．75、39．10mg／kg和41．80mg／kg,占可溶性总氮（TSN）的51．25％、68．28％和68．57％,分别为土壤全氮的2．54％、3．75％和4．00％;土壤游离氨基酸的含量分别为7．18、7．42mg／kg和7．41mg／kg,分别占SON的30．53％、19．23％和17．50％,占全氮的0．74％、0．71％和0．71％．方差分析结果表明,土壤类型对土壤SON含量及其在TSN和全氮中所占的比例、游离氨基酸在SON中所占的比例有显著影响,而对游离氨基酸的含量及其占土壤全氮比例的影响未达显著水平。枯枝落叶层中SON含量（248．26mg／kg）为农田土壤（24．75mg／kg）的10倍左右,且林地土壤0～20cm土层SON含量（31．03mg／kg）显著的高于当地农田,两种生态系统0～20cm土层土壤中游离氨基酸含量（7．18～7．32mg／kg）相当,但均极显著低于枯枝落叶层中游离氨基酸平均含量（18．57mg／kg）。相关分析结果表明,TSN、SON以及游离氨基酸与全氮、硝态氮、铵态氮、有机质等各养分之间均有极显著的相关性。     

施肥和增水对弃耕草地土壤酸中和容量的影响

大气氮沉降增加是草地土壤酸化的主要原因。土壤酸缓冲性能作为评估土壤酸化的重要指标,对氮输入的响应受到降水与其他限制养分含量的影响。本研究以我国北方温带弃耕草地氮、磷、水添加试验13年后的土壤为对象,利用二次多项式模型拟合酸滴定曲线,计算了土壤酸缓冲容量(ABC)以及以pH 5.0和4.0为参比的土壤酸中和容量(ANC)。结果表明: 不增水处理下,单独加氮和同时添加氮磷均显著降低土壤pH,降低以pH 5.0和4.0为参比时的酸中和容量(ANC_pH5.0和ANC_pH4.0);单独加磷对土壤pH、ANC_pH5.0和ANC_pH4.0均无显著影响。增水处理下,加氮及加氮磷显著降低土壤pH、ANC_pH5.0和ANC_pH4.0;加磷显著降低土壤pH,但增加了ANC_pH4.0,而对ANC_pH5.0无显著影响。与不增水处理相比,增水处理对土壤pH、酸中和容量均具有显著的正效应。对于初始pH值不同的土壤,采用土壤酸中和容量比酸缓冲容量能更好地指示土壤抗酸化能力。     

Chemical characterization of humic substances extracted from organic-waste-amended soils

Humic substances were extracted from a soil treated, in a 4-year experiment, at different rates with a sludge from anaerobic treatment of combined civil and industrial wastes, and with agricultural manure. Elemental and chemical analyses, molecular weight (MW) distribution and infrared (IR) spectroscopy were performed on the purified humic acids (HA). Organic wastes significantly increased the HA content of the treated soils and improved CEC. The C/N, C/H and C/O ratios of HA extracted from the original wastes showed a higher degree of humification for sludge than for manure. This difference was also noticed for the C/N ratio of soil humic extracts, indicating a faster humification process for the sludges in soil. The content of oxygen-containing functional groups was lower than the ‘model’ HA reported in the literature, and even more so for HA from sludges, reflecting their anaerobic formation. MW distribution and E₄/E₆ ratios showed that the sludge material had a higher molecular complexity than manure, supporting the high degree of humification attributed to the former. HA extracted from sludge-treated soils revealed a molecular dimension increasing with the application doses of waste material. Infrared spectra showed that HA formed in soils after waste additions reflected the chemical composition of the original organic material, which was rich in aliphatic groups and peptides for sludge and in carbohydrates for manure. On the basis of this study, it is concluded that not only are organic waste additions able to build up the HA content in soils but the HA formed assume the chemical characteristics and the degree of humification of the original material.     

Changes in soil mineralogy and exchangeable cation pools in stands of Norway spruce planted on former pasture land

Chemical and mineralogical properties of the soils in 35- and 70-year-old stands of Norway spruce (Picea abies (L.) Karst), planted on former pasture and were studied at Asa Experimental Forest, southern Sweden. Remnant deciduous forests bordering the spruce stands were used as controls to assess possible tree-species-related effects on soil development. All soils are acid with little difference in soil pH between the spruce and deciduous stands. However, the saturation of the exchange complex with Mg is lower beneath spruce and the total exchangeable Mg pool in the upper meter of these soils is one third of the Mg store beneath the deciduous stands. Amphibole, biotite and chlorite are the major sources of Mg in the parent soil. The clay fraction of the topsoil beneath spruce has been depleted of all these easily weatherable ferromagnesian minerals. Apart from weathering-resistant primary silicates, the clay fraction consists almost exclusively of expandable, smectitic mixed-layer minerals, which are believed to be the products of advanced stages of biotite weathering. In contrast, vermiculite is the dominant secondary mineral in the A-horizon in the deciduous stands, and some chlorite has survived. Moreover, a greater depth of in situ weathering is indicated for the soil of the old spruce stands where biotite/vermiculite mixed-layers have formed in the C-horizon as products of early stages of biotite weathering. Thus, differences between the paired sites in soil solution chemistry are supported by the qualitative differences in soil mineralogy, and are believed to reflect divergent biotic and/or abiotic processes in the different stand types. This revised version was published online in August 2006 with corrections to the Cover Date.     

云冷杉林林隙内倒木腐烂等级及其形成的微立地类型对土壤理化性质的影响

为揭示倒木腐烂等级及其形成的微立地类型对土壤理化性质的影响,分析了小兴安岭凉水国家级自然保护区谷地云冷杉林由倒木形成的林隙内不同腐烂等级倒木形成的3种微立地(丘顶、坑底和倒木下)的土壤理化性质(容重、毛管孔隙度、总孔隙度、毛管持水量、饱和持水量、土壤有机碳、全氮、全磷、有效磷、速效钾和pH值)和化学计量特征(C/N、N/P和C/P)的差异.结果表明: 倒木腐烂等级对土壤物理性质的影响不显著,而倒木形成的微立地类型对其影响显著.除土壤饱和持水量外,倒木下的其他土壤物理性质均最好,坑底最差;随着倒木腐烂等级的上升,除有效磷外的其他土壤养分含量呈显著上升趋势;3种微立地中,坑底土壤养分含量最低,pH最高;随倒木腐烂等级的上升,3种微立地浅层土壤C/N、N/P和C/P下降,而丘顶和坑底深层土壤C/N上升,N/P和C/P下降,C/P的变化趋势与土壤有效磷的一致.综上,随倒木腐烂等级的提高,土壤养分含量显著增加,且不同类型微立地之间差异明显,其中坑底始终最低.     

Spectroscopic Evidence of the Improvement of Reactive Iron Mineral Content in Red Soil by Long-Term Application of Swine Manure

Mineral elements in soil solutions are thought to be the precursor of the formation of reactive minerals, which play an important role in global carbon (C) cycling. However, information regarding the regulation of mineral elements release in soil is scarce. Here, we examined the long-term (i.e., 23 yrs) effects of fertilisation practices on Fe minerals in a red soil in Southern China. The results from chemical analysis and Fourier-transform infrared spectroscopy showed that long-term swine manure (M) treatment released greater amounts of minerals into soil solutions than chemical fertilisers (NPK) treatment, and Fe played a dominant role in the preservation of dissolved organic C. Furthermore, Fe K-edge X-ray absorption near-edge fine structure spectroscopy demonstrated that reactive Fe minerals were mainly composed of less crystalline ferrihydrite in the M-treated soil and more crystalline goethite in the NPK-treated soil. In conclusion, this study reported spectroscopic evidence of the improvement of reactive Femineral content in the M-treated soil colloids when compared to NPK-treated soil colloids.     

模拟增温对西藏高原高寒草甸土壤供氮潜力的影响

过去几十年青藏高原呈现显著的增温趋势,冬季增温幅度显著高于生长季的季节非对称特征。气候变暖会对生态系统氮素循环产生重要影响,但关于全年增温与冬季增温对高寒生态系统氮循环的不同影响仍缺乏研究。在青藏高原高寒草甸区开展模拟增温试验,研究季节非对称增温对高寒草甸生态系统氮循环的影响。该试验布设于2010年7月,设置3种处理(不增温、冬季增温与全年增温)。研究结果发现,开顶箱增温装置造成了小环境的暖干化:显著提高了地表空气温度和表层土壤温度,降低了表层土壤含水量。冬季增温会加剧土壤中氮素的流失,所以在经历了冬季增温后土壤氮含量显著降低;在生长季节,土壤氮素周转速率受土壤水分的调控,在降雨较少的季节,增温引起的土壤含水量降低会抑制土壤氮周转速率。对于土壤微生物量而言,高寒草甸土壤微生物量碳表现出明显的季节动态,在生长季旺盛期较低,在生长季末期和初冬季节反而较高,这说明为了降低对土壤养分的竞争,高寒草甸植物氮吸收与土壤微生物氮固持在时间上存在分离。研究结果表明,冬季增温导致的土壤养分含量变化会影响随后生长季植物群落的生产力、结构组成与碳氮循环等过程,对生态系统过程产生深远的影响。     

Influence of Electrolytes on the Thicknesses of the Phospholipid Bilayers of Lamellar Lecithin Mesophases

Over a wide range of water contents, aqueous lecithin-water mixtures are mesophases in which lecithin bilayers alternate with water layers. This paper reports on low-angle X-ray diffraction measurements of the effects of electrolytes, at 1.0 N concentration, on the thicknesses of the bilayers in mesophases formed by the synthetic lecithin: 1-octadec-9-enyl-2-hexadecylglycerophosphocholine. With solutions of LiCl, NaCl, Na₂SO₄, KCl, and CsCl, the bilayer thicknesses are less than with pure water. The maximum reduction in bilayer thickness with these electrolytes is about 10% and occurs with mesophases of high content of KCl and CsCl solutions. With HCl solutions the bilayer thicknesses are about 5% greater than with pure water, and with CaCl₂ solutions the bilayer thicknesses are about the same as with pure water. The maximum amount of solution which can be mixed with lecithin before a second, purely aqueous phase is formed is also affected by electrolytes, the order for the various 1.0 N solutions being CsCl = KCl > NaCl > Na₂SO₄ > (pure water) = LiCl > CaCl₂.     

Effects of tannery waste on growth dynamics and metal uptake in Salix alba L

Abstract

This paper aims at providing a preliminary study of the effects of different doses of tannery waste containing high amounts of organic substances, mineral elements and heavy metals on growth dynamics and metal accumulation in willow plants. Scions of Salix alba L., clone S61-02, were grown in the open near Pisa (Italy), in pots filled with a natural soil. Willows were pruned for a unique shoot and cultivated with three different treatments: non-amended soil, soil amended with 150 or 300 g of tannery waste. Non-destructive measures of plant height and leaf area were performed during one growth season. Determination of biomass, and chemical analyses of the minerals were performed at the end of the experiment. The waste-treated plants increased all growth parameters significantly more than the non-treated ones. The concentration of the analysed elements (N, P, K, Ca, Mg, S, B, Fe, Mn, Cu, Zn, Cr) changed significantly between treatments and organs. The results can be useful for developing phytostabilization and/or phytoextraction strategies of tannery waste using S. alba.     

钻井废弃物配合外源有机物质对风沙土理化性质及菠菜生长的影响

采用室内盆栽试验研究水基废弃钻井泥浆、岩屑等钻井废弃物配合腐植酸、木本泥炭等外源有机物质在风沙土中的施用效果,并分析其对菠菜生长的影响,以期为钻井废弃物资源化利用和风沙土改良提供参考。共设3组室内盆栽试验:基础组共4个处理,以风沙土为对照(CK),将风沙土与岩屑按质量比1∶1混合后分别添加0、2%、4%含量水基废弃钻井泥浆(干基);基础组处理分别添加1%腐植酸、1%腐植酸+3%木本泥炭混合物,作为腐植酸组和木本泥炭组。结果表明: 基础组中,与CK相比,施用钻井废弃物显著增加了土壤有机质含量,pH和电导率上升,2%含量水基废弃钻井泥浆显著促进菠菜生长。腐植酸和木本泥炭使土壤pH降低,有机质含量显著增加,电导率上升,腐植酸组株高、总叶面积、鲜重、干重等植物生长指标均高于基础组中对应处理,混合添加腐植酸和木本泥炭后对植物生长促进效果不显著。最佳处理为腐植酸组添加2%含量水基废弃钻井泥浆,土壤有机质含量为13.1 g·kg^-1,播种40 d后菠菜株高、总叶面积、鲜重和干重分别比CK显著增加49.7%、93.4%、83.3%、34.6%。钻井废弃物配合有机物质施用可以显著增加土壤有机质含量,促进菠菜生长,风沙土+岩屑+水基废弃钻井泥浆(2%)+腐植酸(1%)是最佳组合模式。