Acta Agrestia Sinica ›› 2023, Vol. 31 ›› Issue (7): 2068-2076.DOI: 10.11733/j.issn.1007-0435.2023.07.017

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Soil Water Repellency and Its Influencing Factors in the Enclosed Grasslands in Yunwu Mountain in Ningxia

WANG Wei-wei1, CHAI Xiao-hong1, PALIXIATI Ge-ming1, REN Xiu-zi1, WANG Jun-feng1, XU Xue-xuan2   

  1. 1. College of Grassland Agriculture, Northwest A&F University, Yangling Shaanxi Province 712100, China;
    2. Institute of Soil and Water Conservation, Northwest A&F University, Yangling Shaanxi Province 712100 China
  • Received:2022-12-02 Revised:2023-03-14 Online:2023-07-15 Published:2023-08-01

宁夏云雾山封育草地的土壤斥水性及影响因素研究

王维维1, 柴晓虹1, 帕力夏提·格明1, 任秀子1, 王军锋1, 徐学选2   

  1. 1. 西北农林科技大学草业与草原学院, 陕西 杨凌 712100;
    2. 西北农林科技大学水土保持研究所, 陕西 杨凌 712100
  • 通讯作者: 徐学选,E-mail:xuxuexuan@nwsuaf.edu.cn
  • 作者简介:王维维(1998-),女,汉族,陕西省潼关县人,硕士研究生,主要从事是草原利用与生态修复研究,E-mail:wangweiwei422@163.com
  • 基金资助:
    国家自然科学基金项目“黄土丘陵区土壤斥水性及其对降雨入渗机制的影响研究”(41977426)资助

Abstract: To understand the performance of soil water repellency (SWR) and its influencing factors in grasslands on the Loess Plateau after enclosure,a study was conducted using five different grasslands with varying enclosure periods (13,22,31,39,and 50 years) at Yunwu Mountain,Ningxia. Field measurements of SWR were taken from 0~3 cm and 3~10 cm depths,and soil physical and chemical properties and microbial characteristics were tested in a laboratory. Results show that no SWR was observed in the soil in the 13-year enclosed grassland,while mild SWR was observed in the 0~3 cm depth of soil in the enclosed grassland from 22~50 years,which increased with increasing enclosure length. No SWR was observed in the 3~10 cm depth of soil in all enclosed grasslands. By correlation analysis,it was indicated that soil total nitrogen,nitrate nitrogen,and moisture content were positively correlated with SWR,while available potassium,available phosphorus,and soil organic carbon are linearly positively correlated with SWR,but microbial biomass carbon and nitrogen are negatively correlated with SWR. Based on the path analysis results,the soil moisture content,total nitrogen,nitrate nitrogen,and microbial biomass carbon were the main influencing factors to SWR in the studied grasslands. The study was helpful to assess the risk of SWR under climate change in the future and provids a scientific basis for vegetation restoration in the Loess hilly region.

Key words: Enclosed grasslands, Water droplet penetration time, Soil water repellency, Soil microbial biomass carbon and nitrogen, Path analysis

摘要: 为了解黄土高原草地封育后的土壤斥水性(Soil water repellency,SWR)表现及其影响因素,以宁夏云雾山5个不同封育年限草地(13年,22年,31年,39年和50年)为例开展研究。野外原位测定其土壤斥水性,取0~3 cm和3~10 cm土样,室内测定土壤理化性质和微生物生物量。结果表明:13年封育草地土壤无斥水性表现,22~50年封育草地0~3 cm土层土壤均表现为轻度斥水,且斥水性随着封育年限的增加而增加,而3~10 cm土层土壤均无斥水性。相关性分析表明:土壤全氮含量、硝态氮含量、含水量与SWR呈指数正相关关系,速效钾、速效磷和有机碳含量与SWR呈线性正相关关系,微生物生物量碳、氮含量与SWR呈负相关关系。基于通径分析得出土壤含水量、全氮含量、硝态氮含量和土壤微生物生物量碳含量是当地SWR的主要影响因素。上述研究有助于评估未来气候变化背景下的斥水风险,也能为黄土丘陵区植被恢复的评价提供良好的科学基础。

关键词: 封育草地, 滴水穿透时间, 土壤斥水性, 土壤微生物生物量碳、氮, 通径分析

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