| 柴达木盆地尕海湖区白刺灌丛沙堆剖面土壤养分的分布和富集特征 |
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| 引用本文： | 王湘,焦菊英,曹雪,李建军,白雷超,孙晓晨. 柴达木盆地尕海湖区白刺灌丛沙堆剖面土壤养分的分布和富集特征[J]. 应用生态学报, 2022, 33(3): 765-774. DOI: 10.13287/j.1001-9332.202203.011 |
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| 作者姓名： | 王湘 焦菊英 曹雪 李建军 白雷超 孙晓晨 |
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| 作者单位： | 1.西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱作农业国家重点实验室, 陕西杨凌 712100;2.中国科学院水利部水土保持研究所, 陕西杨凌 712100 |
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| 基金项目： | 第二次青藏高原综合考察研究项目(2019QZKK0603)和中国科学院战略性先导科技专项(XDA20040202)资助。 |
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| 摘 要： | 白刺沙堆作为柴达木沙漠地区一种特殊的生物地貌景观,在固定流沙、改良土壤和维持区域生态环境稳定等方面发挥着极为重要的作用。本研究以柴达木盆地尕海湖区的白刺沙堆为对象,选取了盖度分别约15%、25%、45%和60%的白刺沙堆分析其剖面及堆间地的土壤有机质(SOM)、全氮(TN)、全磷(TP)、全钾(TK)、碱解氮(AN)、速效磷(AP)、速效钾(AK)含量,探究白刺灌丛沙堆土壤养分垂直分布规律和富集特征。结果表明: 研究区SOM、TN、TP、TK、AN、AP、AK含量在4个沙堆中变化范围分别为1.67～10.22 g·kg-1、0.05～0.42 g·kg-1、0.31～0.54 g·kg-1、15.87～18.84 g·kg-1、2.26～11.68 mg·kg-1、0.80～15.00 mg·kg-1、45～161 mg·kg-1。垂直方向上,在盖度15%的白刺沙堆中,除TP无明显变化外,其余土壤养分指标均随土层深度的增加呈先减少后增加再减少趋势;在盖度25%、45%和60%的白刺沙堆中,SOM、TN、AN、TP、AP均表现为随土层深度的增加整体呈减少趋势,而TK、AK随土层变化不明显。在沙堆地平面以上,除TP未表现出富集效应外,SOM、TN、TK、AN、AP、AK均有富集,且基本在表层富集程度最大,其中AN富集率达5.19;在沙堆地平面以下,TN、TK、AN、AK、AP也均表现出富集效应。Pearson相关性分析和逐步回归分析表明,SOM、TN、AN、TP、AP、TK、AK均与土壤含水量呈显著正相关,与海拔呈极显著负相关;其中除TP外,其余养分指标均主要受海拔的影响。综上,白刺沙堆剖面土壤养分含量在表层最高,其富集效应不仅体现在沙堆内部,在沙堆地平面以下也有所体现。本研究结果可为柴达木盆地地区白刺沙堆科学利用和环境保护提供参考。
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| 关 键 词： | 白刺灌丛沙堆 土壤养分 富集效应 沙堆剖面 |
| 收稿时间： | 2021-06-09 |
Distribution and enrichment characteristics of soil nutrients in the nebkhas profile of Nitraria tangutorum in Gahai Lake Area,Qaidam Basin. |
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| WANG Xiang,JIAO Ju-ying,CAO Xue,LI Jian-jun,BAI Lei-chao,SUN Xiao-chen. Distribution and enrichment characteristics of soil nutrients in the nebkhas profile of Nitraria tangutorum in Gahai Lake Area,Qaidam Basin.[J]. The journal of applied ecology, 2022, 33(3): 765-774. DOI: 10.13287/j.1001-9332.202203.011 |
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| Authors: | WANG Xiang JIAO Ju-ying CAO Xue LI Jian-jun BAI Lei-chao SUN Xiao-chen |
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| Affiliation: | 1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, China;2.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China |
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| Abstract: | As a special bio-geomorphic landscape in the Qaidam desert area, Nitraria tangutorum nebkhas play a critical role in fixing quicksand, improving soil quality, and maintaining the stability of regional ecological environment. Taking the N. tangutorum nebkhas with coverage of approximately 15%, 25%, 45% and 60% in Gahai Lake area of Qaidam Basin as the research objects, we analyzed the vertical distribution and enrichment characteristics of soil organic matter (SOM), total nitrogen (TN), total phosphorus (TP), total potassium (TK), alkali-hydrolyzable nitrogen (AN), available phosphorus (AP) and available potassium (AK). The results showed that the contents of SOM, TN, TP, TK, AN, AP and AK varied in the range of 1.67-10.22 g·kg-1, 0.05-0.42 g·kg-1, 0.31-0.54 g·kg-1, 15.87-18.84 g·kg-1, 2.26-11.68 mg·kg-1, 0.80-15.00 mg·kg-1 and 45-161 mg·kg-1, respectively. Vertically, soil nutrients in the N. tangutorum nebkhas with 15% coverage showed a decreasing trend first then increased, and then decreased again with the increase of soil depth, except for TP, which did not show any significant change. In the nebkhas with 25%, 45% and 60% coverage, SOM, TN, AN, TP and AP all showed a decreasing trend with increasing soil depth ,whereas TK and AK did not change significantly with soil layer. Above the nebkhas ground level of N. tangutorum, SOM, TN, TK, AN, AP and AK were all enriched, especially in the surface layer.Aamong all the nutrients, the enrichment rate of AN reached 5.19. In addition, below the nebkhas ground level of N. tangutorum, TN, AN, TK, AK and AP also showed enrichment. SOM, TN, AN, TP, AP, TK and AK were all significantly positively correlated with soil water content, and negatively correlated with altitude. All nutrients except TP were mainly affected by altitude. In conclusion, soil nutrient content of N. tangutorum nebkhas was the highest in the surface layer, the enrichment effect of which was not only reflected in the interior of the nebkhas, but also below the ground level of the nebkhas. Our results could provide reference for the scientific utilization of N. tangutorum nebkhas and ecological environment protection in Qaidam Basin area. |
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| Keywords: | Nitraria tangutorum nebkhas soil nutrient enrichment effect nebkhas profile |
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