气候变化驱动的草地灌丛化过程中地表植被与土壤水分效应变化数据集

全球草地正经受大面积灌丛化，影响生态系统水文过程和生态功能。然而，不同程度灌丛化草地如何影响草本植物生长和土壤水力特性尚不清楚。为解决这一问题，本研究调查了四个站点的不同灌丛化阶段（未入侵的原生草地，轻度、中度和重度灌丛化草地）草地植被及土壤特征。结果表明，灌丛化草地的草本植物盖度、密度、地上和地下生物量以及物种丰富度均显著低于未入侵的原生草地，而土壤田间持水量，总孔隙度和非毛管孔隙度显著高于原生草地，随着灌丛盖度的增加，灌下草地土壤体积含水量下降。总体上，灌丛化改善了土壤性质，但代价是草本植物生长受限，同时表层土壤含水量降低。

Global grasslands are undergoing extensive shrub encroachment, which disrupts ecosystem hydrological processes and ecological functions. However, it remains unclear how grasslands with varying degrees of shrub encroachment influence herbaceous plant growth and soil hydraulic properties. To address this research gap, this study investigated vegetation and soil characteristics of grasslands at four sites covering four shrub encroachment stages: uninvaded native grassland, lightly, moderately, and severely encroached grasslands. The results demonstrated that herbaceous plant coverage, density, aboveground and belowground biomass, as well as species richness in encroached grasslands were significantly lower than those in uninvaded native grasslands. Conversely, soil field capacity, total porosity, and non-capillary porosity were significantly higher than those in native grasslands. Moreover, soil volumetric water content in the understory grasslands beneath shrub canopies decreased with increasing shrub coverage. Overall, shrub encroachment improves soil properties, but at the cost of restricted herbaceous plant growth and reduced surface soil water content.

搜集汇总

背景与挑战

背景概述

该数据集研究了气候变化驱动的草地灌丛化过程中地表植被与土壤水分效应的变化，基于青海省达日县窝赛乡直却村的实地调查，涵盖未入侵原生草地及不同灌丛化阶段。关键发现显示，灌丛化虽改善了土壤持水性和孔隙度，但导致草本植物生长受限和表层土壤含水量下降，揭示了灌丛化对生态系统水文和植被的复杂影响。