草业学报2026，Vol.35Issue(4)：14-28,15.DOI:10.11686/cyxb2025198
高寒草甸退化斑块恢复演替对土壤持水能力的影响
Effects of recovery succession of degraded patches on soil water holding capacity in an alpine meadow
摘要
Abstract
This research investigated recovery processes in a patchy degraded alpine meadow in the source region of the Yellow River.Variation in soil water holding capacity and related parameters during natural recovery and succession of the studied alpine meadow was evaluated for two site categories,low-lying and sloping grassland.For both site categories,the degraded alpine meadow was divided into four recovery and succession stages defined by vegetation conditions:bare patch(BP),short-term recovered patch(SRP),long-term recovered patch(LRP),and healthy alpine meadow(HAM).Both a field quadrat survey and an indoor experiment were conducted to ascertain the variation in soil water holding capacity,porosity,bulk density,organic carbon,and aboveground and underground biomass of plants.To reveal how soil water holding capacity varied at different recovery or succession stages,the correlations between these variables are explored.The results show that saturated soil water holding capacity,capillary water holding capacity,field water holding capacity,capillary porosity,total porosity,organic carbon and aboveground and underground biomass of plants in the bare patches of the degraded alpine meadow increased gradually with the recovery succession stage,while soil bulk density and non-capillary porosity decreased gradually.In addition,the low-lying grassland had higher soil saturated water holding capacity,capillary water holding capacity,field water holding capacity,capillary porosity,total porosity,organic carbon,aboveground and underground biomass of plants than the sloping grassland at all recovery succession stages,while soil bulk density and non-capillary porosity were lower than those in sloping grassland.Furthermore,soil saturated water holding capacity,capillary water holding capacity and field water holding capacity of low-lying and sloping grassland were significantly positively correlated with soil organic carbon,capillary porosity,total porosity and aboveground and underground biomass of plants(P＜0.05),and were significantly negatively correlated with soil bulk density and non-capillary porosity(P＜0.05).In addition,there was a significant positive correlation between soil bulk density and non-capillary porosity of both the low-lying and sloping grassland sites(P＜0.05),and a significant negative correlation between soil bulk density and soil organic carbon,capillary porosity,total porosity,and aboveground and underground biomass of plants(P＜0.05).There was a significant positive correlation between soil organic carbon,capillary porosity,total porosity,and aboveground and underground biomass of plants(P＜0.05).In short,the natural recovery succession of the patchily degraded alpine meadow promoted soil water holding capacity and improved the water conservation function of soil.关键词
土壤持水能力/滩地/坡地/斑块化退化/高寒草甸/恢复演替/相关性分析Key words
soil water holding capacity/low-lying grassland/sloping grassland/patchy degradation/alpine meadow/recovery succession/correlation analysis引用本文复制引用
马婧娟,李希来,尹通江,鲍玉英,张玉芳,丁北桥,袁颖..高寒草甸退化斑块恢复演替对土壤持水能力的影响[J].草业学报,2026,35(4):14-28,15.基金项目
国家自然科学联合基金重点支持项目(U23A20159,U21A20191),青海省科学技术厅项目(2023-QY-210)和高等学校学科创新引智计划项目(D18013)资助. （U23A20159,U21A20191）
