Response of soil nutrients and erodibility to slope aspect in the northern agro-pastoral ecotone, China

IF 5.8 2区农林科学 Q1 SOIL SCIENCE

Soil Pub Date : 2024-01-17 DOI:10.5194/soil-10-61-2024

Yuxin Wu, Guodong Jia, Xinxiao Yu, Honghong Rao, Xiuwen Peng, Yusong Wang, Yushi Wang, Xu Wang

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引用次数: 0

Abstract

Abstract. Soil erosion, considered a major environmental and social problem, leads to the loss of soil nutrients and the degradation of soil structure and impacts plant growth. However, data on the effects of land use changes caused by vegetation restoration on soil nutrients and erodibility for different slope aspects are limited. This study was conducted to detect the response of soil nutrients and erodibility to slope aspect in a typical watershed in the northern agro-pastoral ecotone in China. The following indexes were used to determine the improvement in soil nutrients and erodibility through a weighted summation method: the comprehensive soil nutrient index and the comprehensive soil erodibility index. The results showed that the vegetation types with the highest comprehensive soil quality index (CSQI) values on western, northern, southern, and eastern slopes were Pinus sylvestris and Astragalus melilotoides (1.45), Caragana korshinskii and Capillipedium parviflorum (2.35), Astragalus melilotoides (4.78), and Caragana korshinskii and Lespedeza bicolor (5.00), respectively. Slope aspect had a significant effect on understory vegetation characteristics, soil nutrients, and soil erodibility. Understory vegetation and soil characteristics explained 50.86 %–74.56 % of the total variance in soil nutrients and the erodibility. Mean weight diameter and total phosphorus were the main factors that affected the CSQI for different slope aspects. Our study suggests that the combinations of species, such as C. korshinskii and L. bicolor, were the optimal selection to improve soil nutrients and soil erodibility for any slope aspect.

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中国北方农牧生态区土壤养分和侵蚀性对坡度的响应

摘要水土流失被认为是一个重大的环境和社会问题，它会导致土壤养分流失、土壤结构退化并影响植物生长。然而，关于植被恢复引起的土地利用变化对不同坡度土壤养分和侵蚀性影响的数据却很有限。本研究以中国北方农牧生态区典型流域为研究对象，探讨土壤养分和侵蚀性对坡度的响应。通过加权求和法确定了土壤养分和侵蚀性的改善指数：土壤养分综合指数和土壤侵蚀性综合指数。结果表明，西坡、北坡、南坡和东坡上土壤综合质量指数（CSQI）值最高的植被类型分别是欧洲赤松和黄芪（1.45）、高山乌骨鸡和毛蕊花（2.35）、黄芪（4.78）和高山乌骨鸡和双色芒（5.00）。坡度对林下植被特征、土壤养分和土壤侵蚀性有显著影响。林下植被和土壤特性解释了土壤养分和侵蚀性总方差的 50.86 %-74.56 %。平均重量直径和总磷是影响不同坡向 CSQI 的主要因素。我们的研究表明，对于任何坡度，树种组合（如 C. korshinskii 和 L. bicolor）都是改善土壤养分和土壤侵蚀性的最佳选择。

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来源期刊

Soil Agricultural and Biological Sciences-Soil Science

CiteScore

10.80

自引率

2.90%

发文量

审稿时长

30 weeks

期刊介绍： SOIL is an international scientific journal dedicated to the publication and discussion of high-quality research in the field of soil system sciences. SOIL is at the interface between the atmosphere, lithosphere, hydrosphere, and biosphere. SOIL publishes scientific research that contributes to understanding the soil system and its interaction with humans and the entire Earth system. The scope of the journal includes all topics that fall within the study of soil science as a discipline, with an emphasis on studies that integrate soil science with other sciences (hydrology, agronomy, socio-economics, health sciences, atmospheric sciences, etc.).