Physiological response of riparian plants to watering in hyper-arid areas of Tarim River,China

The physiological responses and adaptive strategies of Populus euphratica Oliv.(arbor species),Tamarix ramosissima Ldb.(bush species),and Apocynum venetum L.(herb species)to variations in water and salinity stress were studied in the hyper-arid environment of the Tarim River in China.The groundwater table,the saline content of the groundwater,as well as the content of free proline,soluble sugars,plant endogenous hormones (abscisic acid (ABA),and cytokinins (CTK))of the leaves of the three species were monitored and analyzed at the lower reaches of the Tarim River in the study area where five transects were fixed at 100 m intervals along a vertical sampling line before and after water release.Saline stress dramatically increased soluble sugar concentration of the three species.Differences in sugar accumulation were determined among the species at different transects.The free proline concentration of the leaves of T.ramosissima and P.euphratica showed a proportional decrease with various degrees of elevation of the groundwater table after water release.There was a least correlation between the soluble sugars and proline stimulation in T.ramosissima.It was strongly suggested that T.ramosissima developed a different strategy to accumulate organic solutes to adapt to the stress environment.The soluble sugars and proline accumulation responded to the changes of groundwater table independently:the former occurred under salt stress,whereas the latter was more significant under drought stress.The concentration and the increase in concentration of ABA and CTK involved in stress resistance of the three species were also determined.This increase in the hormone concentration in P.euphratica was different from that of the other two species.Expressed as a function of increase of ABA concentration in leaves,A.venetum and T.ramosissima showed a different solute accumulation in response to groundwater table.There was a significant correlation between ABA accumulation and A [proline] in A.venetum as well as between ABA accumulation and △ [sugar] in T.ramosissima.     

塔里木河流域荒漠河岸植物对应急输水的生理响应

选择塔里木河沿岸典型样地,以乔木树种胡杨(Populuseuphratica)、灌木柽柳(Tamarixspp.)和草本植物罗布麻(Apo-cynumvenetum)为研究材料,垂直距离输水河道500m范围内,间隔100m设置一个采样断面。监测并分析塔里木河下游应急输水前后5个断面地下水位、地下水含盐量及3种植物叶片游离脯氨酸、可溶性糖、内源植物激素脱落酸(ABA)和细胞分裂素(CTK)含量的变化。研究3种荒漠植物对水盐双重胁迫环境的生理响应及适应策略。结果表明:盐胁迫显著增加3种植物叶片或同化枝的可溶性糖浓度,断面间不同植物叶片或同化枝可溶性糖积累存在差异;输水后断面间随地下水位不同程度的抬升,胡杨和柽柳叶片或同化枝脯氨酸含量出现了成比例的下降;柽柳同化枝可溶性糖与脯氨酸积累相关性最小,发展了不同于另外两种植物的通过有机溶剂积累适应胁迫环境的策略,即同化枝可溶性糖与脯氨酸作为响应于地下水位变化的功能物质独立地起作用,可溶性糖积累对盐胁迫的响应明显,而脯氨酸积累对干旱胁迫的响应更为明显;对与胁迫抗性有关的植物内源激素ABA、CTK浓度及浓度增长量变化进行分析,发现胡杨具有不同于其他两种植物的内源ABA、CTK浓度增量变化趋势;胡杨和罗布麻叶片ABA积累量与脯氨酸积累百分量(△[脯氨酸])而柽柳中ABA积累量与可溶性糖积累百分量(△[可溶性糖])显著相关。     

锌硼营养对苦瓜产量品质与叶片多胺、激素及衰老的影响

采用田间试验、植株生理生化测定方法,研究了锌硼营养对苦瓜(株洲长白)产量品质与叶片多胺、激素及衰老的影响。结果表明,在锌硼缺乏的土壤中施用硫酸锌和硼砂均可提高苦瓜产量,并可提高苦瓜蛋白质、Vc和17种氨基酸含量,尤其是人体必需氨基酸含量,降低NO3^-含量,改善苦瓜品质。这与锌硼提高了叶片多胺(PAs)、腐胺(Put)、亚精胺(Spd)、精胺(Spm)、抗坏血酸(ASA)、吲哚乙酸(IAA)、赤霉素(GA3)含量以及超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)酶的活性,减少脱落酸(ABA)、丙二醛(MDA)含量,从而抑制膜脂过氧化有关试验结果同时表明苦瓜产量与叶片PAs、Put、Spd、Spm、GA3、SOD、POD、CAT呈极显著正相关,与叶片MDA与ABA含量呈极显著负相关。叶片MDA含量与ABA呈极显著正相关,而与PAs、Put、Spd、Spm、ASA、IAA、CA3、SOD、POD、CAT呈极显著负相关。     

温水浸种对杜仲种子萌发过程中保护酶活性及内源激素含量变化的影响

探讨杜仲（Eucommia ulmoides Oliver）种子萌发过程中保护酶活性及内源激素含量的变化，为其种子破眠及萌发不同时期采取有效处理措施，从而提高出苗率提供参考。利用室温（CK）、40℃、50℃、60℃和70℃不同水温，探讨温水浸种对杜仲种子萌发的影响。种子萌发进程中，利用常规生理生化方法测定种子内超氧化物歧化酶（SOD）、过氧化物酶（POD）活性和丙二醛（MDA）含量，以及酶联免疫法测定赤霉素（GA₃）、吲哚乙酸（IAA）、脱落酸（ABA）和玉米素核苷（ZR）含量。结果表明：①温水浸种处理能提高了杜仲种子的发芽率及发芽势，其中以50℃温水处理最为显著。②与室温浸种处理相比，50℃温水浸种处理提高了种子内SOD及POD活性，减轻了质膜氧化损伤程度，致使MDA含量的持续下降，从而促使种子朝向有利于萌发的方向发展。此外，50℃温水浸种处理在提高种子内促进生长内源GA₃、IAA及ZR含量的同时，并降低了抑制生长的内源ABA含量，致使GA₃/ABA、IAA/ABA和ZR/ABA值均明显高于室内浸种处理，最终促进了杜仲种子的萌发。     

塔里木河中游地区3种植物的抗旱机理研究

对塔里木河中游地区沙吉力克、阿其河等断面地下水位进行监测并对胡杨、柽柳、芦苇3种植物的可溶性糖、脯氨酸等生理指标进行测定分析.研究显示：（1）塔里木河中游地区植物生长与地下水位变化关系密切,随着不同断面地下水位埋深程度的增加,植物体内可溶性糖与脯氨酸含量呈增加趋势;（2）在干旱胁迫情况下,植物通过可溶性糖、脯氨酸等渗透调节物质的积累来提高自身的抗旱性;（3）植物叶片可溶性糖和脯氨酸的积累存在互相补偿的关系.研究表明在相同水分胁迫下,柽柳和芦苇对地下水位的变化更为敏感,胡杨的抗旱性较强.     

塔克拉玛干沙漠南缘柽柳和胡杨水势季节变化研究

对塔克拉玛干沙漠南缘的柽柳和胡杨生长周期内的清晨水势和水势日变化的连续野外测定表明,两种植物在整个生长期内均未出现明显的水分亏缺.清晨水势的季节变化幅度不大,正午水势有不同程度的降低;一次性人工灌溉对植物水分状况没有明显影响.采伐利用方式不影响植物的水分状况.地下水是柽柳和胡杨生存与生长的先决条件.维持该区域地下水位的基本稳定是保证该区域柽柳和胡杨恢复重建的重要前提.     

新疆塔里木河下游生态输水与胡杨叶片的生理及形态响应

选择塔里木河下游3个典型断面的15个研究样地,分析和测定了塔里木河下游2000～2002年生态输水前后不同研究样地的地下水位、地下水含盐量和胡杨(Populus euphratica Oliv.)叶片中脯氨酸、可溶性糖、植物内源激素脱落酸和细胞分裂素的含量以及胡杨叶片的形态结构变化,研究了塔里木河下游主要建群种胡杨对生态输水的生理与形态的响应和适应性.结果表明,塔里木河下游胡杨生长已受到不同程度的干旱胁迫;输水后各样地地下水位均有所上升,胡杨对浅层地下水位的变化表现出明显响应,胡杨受到的生理胁迫降低,胡杨叶片角质层厚度、维管束导管官腔直径及管壁厚度皆随地下水位的上升而减少;随着地下水位的上升,地下水含盐量分别提高1.76～2.47倍,输水效果由于盐对植物的生理胁迫作用的增加而有所减弱;在塔里木河下游极端干旱环境下,胡杨林保育恢复的合适地下水位埋深为3.15～4.12 m,地下水含盐量为67.15～72.65 mm.     

新疆塔里木河下游生态输水与胡杨叶片的生理及形态响应

选择塔里木河下游3个典型断面的15个研究样地,分析和测定了塔里木河下游2000￣2002年生态输水前后不同研究样地的地下水位、地下水含盐量和胡杨(Populus　euphratica　Oliv.)叶片中脯氨酸、可溶性糖、植物内源激素脱落酸和细胞分裂素的含量以及胡杨叶片的形态结构变化,研究了塔里木河下游主要建群种胡杨对生态输水的生理与形态的响应和适应性。结果表明,塔里木河下游胡杨生长已受到不同程度的干旱胁迫;输水后各样地地下水位均有所上升,胡杨对浅层地下水位的变化表现出明显响应,胡杨受到的生理胁迫降低,胡杨叶片角质层厚度、维管束导管官腔直径及管壁厚度皆随地下水位的上升而减少;随着地下水位的上升,地下水含盐量分别提高1.76　￣　2.47倍,输水效果由于盐对植物的生理胁迫作用的增加而有所减弱;在塔里木河下游极端干旱环境下,胡杨林保育恢复的合适地下水位埋深为3.15　￣　4.12　m,地下水含盐量为67.15　￣　72.65　mm。     

新疆策勒绿洲外围四种多年生植物的水分生理特征

对新疆策勒绿洲外围多年生植物胡杨、柽柳、沙拐枣和骆驼刺的水分生理特性进行了试验研究.结果表明：4种植物在生长季内没有受到严重的水分胁迫,灌溉对植物水分生理指标变化的影响不显著(P＞0.05).4种植物水分生理特性的季节变化各不相同.其中,骆驼刺的清晨水势和日均茎流量最高,但其平均水分利用效率最低;沙拐枣的平均水分利用效率最高,而且其清晨水势与日均茎流量的变化最为稳定,季节变幅不大;柽柳的清晨水势最低,具有较好的环境适应性;胡杨水分生理指标的季节变化相对平稳.在新疆策勒绿洲外围的极端干旱环境中,4种植物通过深根系和地下水相连接,并利用地下水来维持其生存与生长.     

UV-B辐射增强和O3浓度升高对大豆叶片内源激素和抗氧化能力的影响

揭示大豆叶片内源激素对UV-B和臭氧胁迫的代谢机制和响应方式,为从分子水平研究植物内源激素对UV-B(Ultraviolet-B)和O3(Ozone)胁迫的适应机制奠定基础。以大豆(Glycine max.)为试验材料,利用开顶式气室研究UV-B(0.32W/m2)和O3((110±10)nmol/mol)复合胁迫对大豆叶片内源激素含量及活性氧代谢系统的影响。结果表明:在大豆整个生育期内,与对照相比,UV-B胁迫使大豆叶片ABA(Abscisic acid)含量、ZR(Zeatin riboside)含量和IAA(Indoleacetic acid)含量显著降低,IAA/ABA、ZR/ABA、(IAA+ZR)/ABA比值升高,O·-2(Superoxide anion free radical,O·-2)产生速率和MDA(Malonaldehyde)含量升高,SOD(Superoxide dismutase)、CAT(Catalase)和POD(Peroxidase)活性显著降低;高浓度O3胁迫下,大豆叶片ABA和IAA含量显著下降、ZR含量显著增加,IAA/ABA、ZR/ABA、(IAA+ZR)/ABA值显著升高,O·-2产生速率和MDA含量增加,SOD、CAT和POD活性显著降低;UV-B和O3复合胁迫下,大豆叶片ABA含量、ZR含量和IAA含量降低,ZR/ABA、(IAA+ZR)/ABA值下降,而IAA/ABA值升高,O·-2产生速率和MDA含量显著增加,SOD、CAT和POD活性显著降低。UV-B辐射增强和O3浓度升高单一及复合作用使大豆叶片内源激素间平衡改变,进而影响大豆叶片的代谢水平。持续胁迫下,植株抗氧化能力下降,对大豆表现为伤害效应。UV-B和O3复合胁迫比单独胁迫时的影响有所加深,但是小于两者单独作用时影响的简单累加。     

Clonal structure and genetic diversity of three desert phreatophytes

The objective of this paper was to assess clone sizes of three perennial desert plant species with AFLP markers and to relate them to clonal and genetic diversity and to hydroecology. The study was carried out at the southern rim of the Taklamakan Desert, where sexual regeneration is only possible shortly after rare flooding events, resulting in rarely established cohorts with subsequent extensive vertical growth and horizontal clonal spread. In this environment, repeated seedling establishment is excluded. We expected decreasing clonal and genetic diversity with increasing clone size and increasing distance to the groundwater table and a common response pattern among all study species. Maximum sizes of Populus euphratica and Alhagi sparsifolia clones were 121 ha and 6.1 ha, respectively, while Tamarix ramosissima clones reached a maximum size of only 38 m(2). In P. euphratica and A. sparsifolia, clonal diversity declined with increasing clone size and increasing distance to the groundwater table, while genetic diversity remained unaffected. Tamarix ramosissima differed from the other species because of a much smaller clonality. Clone size and clonal diversity were found to be good proxy variables for clone age. Despite the considerable age of the clones, genetic diversity is maintained in the populations.     

塔里木河下游柽柳ABA累积对地下水位和土壤盐分的响应

近年来发现在逆境下(干旱、低温、高温、盐渍等)的植物体内大量积累ABA,从而引导人们去研究ABA与植物抗逆性之间的关系。在塔里木河下游地区影响植被正常生长发育的各种胁迫因子中,地下水位和土壤盐分是导致"绿色走廊"衰败的主要因素。柽柳是塔里木河下游荒漠植被的主体,对于改善生态环境、遏制沙漠化、保护生物多样性等诸多方面具有重要作用。因此,研究柽柳和地下水位以及土壤盐分的关系,对于维护塔里木河流域天然植被赖以生存的环境,保护柽柳这一重要的生物资源,维持生态平衡的良性循环具有重要意义。运用国际通用软件SAS6.12对塔里木河下游柽柳ABA和地下水位以及土壤盐分进行相关分析表明,柽柳ABA含量与地下水位呈极显著正相关,相关系数R=0.80305(显著性程度P=0.0003);与土壤盐分呈显著负相关,相关系数R=-0.59036(显著性程度P=0.0205)。由各断面柽柳ABA含量变化与地下水位和土壤盐分关系分析结果可以初步推断:3.12m的地下水位和0.96g/L的土壤盐分已经威胁到柽柳的正常生长发育,地下水位超过5.59m、土壤盐分大于1.61g/L则会对柽柳造成严重胁迫。在恢复和保育塔里木河流域天然植被的过程中,应该把对植被造成胁迫的外界条件的成因和植被自身的抗旱、抗盐等抗逆特性结合起来进行考虑:根据耐旱耐盐植被的合理生态水(盐)位,在主河道两岸维持一定范围的地下水位,使乔木、灌木、草本植被能良好地生长,发挥多种生态功能,这样既可以避免水资源的浪费又能充分发挥生态输水的功效,有利于从根本上解决"绿色走廊"的问题。     

Sex-related adaptive responses of Populus cathayana to photoperiod transitions

Populus cathayana Rehd., a dioecious tree species, occupies a wide range of habitats in southwest China. Both males and females were grown under two regimes of photoperiod, from mid-length to short-day photoperiod (SD shift), or to long-day photoperiod (LD shift). SD shift triggered leaf senescence in both males and females by decreasing net photosynthesis rate ( A ), transpiration ( E ), and chlorophyll pigment ( Chl ), non-structural carbohydrate (NSC) and indoleacetic acid (IAA) contents, while increasing abscisic acid (ABA), malonaldehyde (MDA) and free proline (Pro) contents. The antioxidant enzyme (e.g. POD, CAT and SOD) activities and capability to maintain ultrastructural integrity also decreased under SD shift. Males exhibited faster leaf senescence than did females, as shown by greater decreases in A , E , Chl and IAA. However, males maintained a less senescent stage than did females, as indicated by higher values of A , Chl , NSC, IAA and antioxidant enzyme activities. Conversely, A , E , NSC and IAA contents and antioxidant enzyme activities were enhanced by lower O₂^•− in females, whereas reduced by higher O₂^•− in males under LD shift. Such sex-dependent responses of P. cathayana to photoperiod transitions showed that males and females possess different adaptabilities, which may relate to sex-specific leaf senescence speed under changing environments.     

Biochemical Genetics of Short-Season Cotton Cultivars that Express Early Maturity Without Senescence

The present study is aimed to investigate the mechanism of the biochemical genetic in shortseasoned cotton (Gossypium hirsutum L.) (SSC). Ten cultivars from two types of SSC were selected, five SSC with no prematuresenescence crossed with five SSC with premature senescence. The parents, F1, and F2 from the reciprocal crosses were field tested in replication in 2001 and 2002. The results indicated that the activities of protective enzymes of the antioxidant system, such as catalase (CAT), superoxide dismutase (SOD), and peroxidase (POD), were higher in the early maturing SSC with premature senescence compared with activities in the SSC parental cultivars that showed premature senescence, whereas the malondialdehyde (MDA) content in former group was lower than that in latter group. Various genetic variances and heritabilities for these biochemical traits and auxin (IAA), abscisic acid (ABA), and chlorophyll (Chl a b) contents were also estimated. Significant additive variance for CAT, POD, ABA, and IAA existed, whereas CAT specific activity and SOD activity were largely controlled by dominant effects. Both maternal and dominant variances played equally predominant roles in the specific activity of POD and SOD, MDA, and soluble portents. The relative contribution of the various genetic components to the phenotypic variation varied in the boll-setting period.     

激动素和丁二酸拌种对玉米衰老过程中抗氧化系统和植物激素的影响

以‘郑单958’（晚衰型品种）和‘豫单2002’（早衰型品种）为实验材料,采用盆栽方式,0．03μg·kg-1的外源激动素（KT）和300mg·kg-1丁二酸复合剂进行拌种处理,研究拌种后玉米根叶衰老指标的变化及其化学调控效应。结果表明：激动素和丁二酸混合拌种后根系与叶片中超氧阴离子（O2-）产生速率、丙二醛（MDA）及脱落酸（ABA）含量低于其对照,而超氧化物歧化酶（SOD）活性和生长素（IAA）含量却较高,据此认为膜脂过氧化得到缓解,根叶的生理功能期延长;且在整个生育期内各个叶位叶的MDA含量、SOD活性、ABA和IAA含量高于根系,但其O2-和IAA／ABA较低,表明根系的衰老早于叶片。综上可以推测,激动素和丁二酸拌种能有效防止根叶早衰,为提高玉米产量打下基础。     

塔里木荒漠绿洲过渡带主要种群生态位与空间格局分析

于新疆塔里木盆地荒漠绿洲过渡带设置3条样带(长900 m×宽50 m)进行植物群落调查,运用生态位测度指标和点格局法对种群空间格局、空间关联性及生态位特征进行研究。结果显示,胡杨(Populus euphratica Oliv.)、多枝柽柳(Tamarix ramosissima Ledeb.)和甘草(Glycyrrhiza inflate Bat.)具有较大的重要值和生态位宽度,对其它生态位较窄的物种具有资源竞争和扩张优势,生态适应能力强,对群落结构和环境变化起决定性作用;生态过渡带植物的种间生态位重叠普遍较高,尤其是草本植物间更明显,此分配格局反映出荒漠植物长期适应旱化生境而发生趋同适应,生态位分化程度低,种间资源竞争激烈;优势种群空间格局呈明显的空间变异性,0~25 m尺度内多枝柽柳和甘草分别呈随机分布和聚集分布,胡杨种群在≤5 m尺度内呈聚集分布,并随尺度增大转为随机分布;胡杨与多枝柽柳、胡杨与甘草、多枝柽柳与甘草分别在4 m、≤16 m和≤25 m尺度内呈显著空间负关联,种间相互排斥。表明在匮乏环境资源条件下植物趋同适应与资源竞争是驱动荒漠植物群落演替和限制物种共存的主要原因。     

塔里木河中下游地区不同地下水位对植被的影响

 根据近几年塔里木河中下游地区的大量监测结果,分析了不同地下水位对植被的影响。结果显示：1)在塔里木河中下游,地下水位与植被盖度和植物种类的回归模型分别可以表示为：Y=159.32e-0.314 8X,R2=0.819 3,　p<0.01;Y=9.113e-0.162 3X,R2=0.606 7, p<0.01。2)地下水位对植被的影响在很大程度上是通过改变土壤含水率来实现的,当地下水位在1～4 m时,其回归模型为：Y=64.898e-0.515X,R2=0.727,p<0.01;当地下水位在4～12 m时,Y=21.147e-0.178X,R2=0.658,p<0.01。当地下水位在3.5～4.0 m时,土壤含水率出现明显变化,因此认为3.5 m是塔里木河中下游地区草本植被生态恢复的最低水位。3)通过胡杨叶脯氨酸(Pro)和脱落酸(ABA)在不同水位条件下的含量变化,可以认为引起胡杨水分胁迫的地下水位出现在5.0 m。其后随着水位的降低,胡杨脱落酸的积累更加明显,地下水位与胡杨叶脱落酸含量可以表示为：Y=0.703 5e0.408X,R2=0.830 4, p<0.01。4)通过塔里木河下游输水后的植被调查,当地下水位出现明显升高后,植被的地表生态响应非常明显,乔灌草植被在水位升高至不同水位后均出现相应的变化,说明以上的分析是符合实际的。     

沙生柽柳扦插生根过程插穗相关理化特征分析

选取沙生柽柳半木质化枝条进行苗床扦插,通过实验测定插穗生根过程中内源激素(IAA、GA3、ZR、ABA)含量、可溶性营养物质(糖、蛋白质)含量及相关氧化酶(PPO、POD、SOD、IAAO)活性的动态变化特征,探讨沙生柽柳插穗扦插生根机理。结果表明:(1)沙生柽柳插穗内源激素含量随生根进程而发生变化,其中,IAA含量在扦插35d最大,并出现较大的波动变化;ZR含量在扦插55d前后变化明显,呈现低水平向高水平转化趋势;ABA、GA3含量依次呈先升高后降低再升高的变化过程,并在扦插15d和55d(80d)呈现变化的峰值和谷值。(2)沙生柽柳扦插生根与相关氧化酶活性密切相关,其中,POD、IAAO活性在插穗扦插35d后长时间保持较高水平,直至插穗生根后POD活性明显降低,IAAO活性有所增加;PPO、SOD活性则在插穗扦插15d保持较高活性,且PPO活性的变化均匀,SOD活性的高低交替变化明显。(3)在沙生柽柳扦插生根期间,插穗可溶性糖含量呈现生根前消耗减少与生根后积累增加两大变化过程,可溶性蛋白质含量表现为扦插后逐步积累增加的变化趋势。研究表明,高水平的IAA、ZR和低水平的GA3、ABA共同调控着沙生柽柳插穗生根;IAA能够通过促进插穗POD、PPO、IAAO活性变化来影响生根,较高的POD、IAAO活性可调节插穗IAA水平,高水平的PPO活性则催化插穗IAA-酚酸复合物的形成,进而诱导插穗生根。     

Biochemical Genetics of Short-Season Cotton Cultivars that Express Early Maturity Without Senescence

The present study is aimed to investigate the mechanism of the biochemical genetic in shortseasoned cotton (Gossypium hirsutum L.) (SSC). Ten cultivars from two types of SSC were selected, five SSC with no premature senescence crossed with five SSC with premature senescence. The parents, F1, and F2 from the reciprocal crosses were field tested in replication in 2001 and 2002. The results indicated that the activities of protective enzymes of the antioxidant system, such as catalase (CAT), superoxide dismutase (SOD), and peroxidase (POD), were higher in the early maturing SSC with premature senescence compared with activities in the SSC parental cultivars that showed premature senescence, whereas the malondialdehyde (MDA) content in former group was lower than that in latter group. Various genetic variances and heritabilities for these biochemical traits and auxin (IAA), abscisic acid (ABA), and chlorophyll (Ch1 a b) contents were also estimated. Significant additive variance for CAT, POD, ABA, and IAA existed, whereas CAT specific activity and SOD activity were largely controlled by dominant effects. Both maternal and dominant variances played equally predominant roles in the specific activity of POD and SOD, MDA, and soluble portents. The relative contribution of the various genetic components to the phenotypic variation varied in the boll-setting period.     

差巴嘎蒿幼苗对沙埋的生态适应和生理响应

沙埋对于沙漠植物存活和生长影响的研究文献已有很多,但迄今有关沙漠植物对于沙埋生理生态适应的研究还很少见有报道。差巴嘎蒿(Artemisia halodendron)广泛分布于我国半干旱沙地中,是流动半流动沙地的优势种。为了解沙生植物对沙埋的生态适应及其生理响应,2010—2011年在内蒙古科尔沁沙地研究了不同沙埋深度下差巴嘎蒿幼苗的存活率、株高等生长特性和渗透调节物质含量,保护酶活性和膜透性的变化,得到以下结果:沙埋对差巴嘎蒿幼苗的存活与生长有着显著影响,特别是沙埋深度超过其株高后,其存活率和高生长受到严重抑制,但和非沙生植物相比,差巴嘎蒿幼苗具有很强的耐沙埋能力,即使沙埋深度达到其株高的200%时仍有部分幼苗存活。随着沙埋深度的增加,差巴嘎蒿幼苗叶片含水量没有显著变化,但过氧化物歧化酶活力降低,过氧化物酶活性增强,过氧化氢酶活性变化不明显,脯氨酸含量增加,可溶性糖含量下降,丙二醛含量下降,膜透性增强。和水分、盐分胁迫不同,沙埋并未造成差巴嘎蒿幼苗的水分亏缺,沙埋胁迫下差巴嘎蒿幼苗死亡率增加、生长受到抑制的主要原因是沙埋导致植物光合面积下降,沙埋叶片无法进行正常呼吸和部分幼苗无法破土生长,但沙埋胁迫下脯氨酸含量的和过氧化物酶活性增强分别在渗透调节和保护细胞膜免受损伤中起到了关键作用。