草业学报2026，Vol.35Issue(2)：15-27,13.DOI:10.11686/cyxb2025079
高寒草甸不同草地微斑块土壤团聚体分布及其与有机碳矿化的关系
Distribution of soil aggregates in different vegetation micro-patches in alpine meadows and the relationship with organic carbon mineralization
摘要
Abstract
Micro-vegetation patchification is a critical process during the retrogressive succession of grasslands.This study explored how vegetation patches influence soil aggregate distribution and stability,and the subsequent effects on soil organic carbon(SOC)mineralization in the Qinghai-Tibet Plateau.Soil aggregates were fractionated using the wet-sieving method into three size classes:macro-aggregates(>250 μm),micro-aggregates(53-250 μm),and silt-clay fractions(<53 μm).SOC mineralization was quantified through indoor incubation experiments.It was found that macro-aggregates dominated all vegetation patches(55.31%-74.01%),but their content and aggregate stability significantly decreased in non-native patches compared to the native vegetation(CK).Notably,macro-aggregate loss was as high as 25.27%in bare areas(BA)(P<0.05).SOC content in macro-,micro-,and silt-clay fractions was highest in CK,Potentilla fruticosa,and Polygonum viviparum patches,followed by Ligularia virgaurea(LV)and BA.SOC cumulative mineralization quantity peaked in LV patches(12.38 g·kg⁻¹)and was lowest in BA(8.26 g·kg⁻¹).Additionally,cumulative mineralization rate was significantly higher in LV and BA than in other patches(P<0.05).Positive correlations were observed between SOC cumulative mineralization quantity and macro-aggregate content as well as aggregate stability(P<0.05).Conversely,cumulative mineralization rate was negatively correlated with aggregate stability and C/N ratio(P<0.01).These findings suggest that analyzing aggregate composition,stability,and mineralization dynamics during patchification processes can provide scientific insights for sustainable grassland management and accurate climate change assessments in the Qinghai-Tibet Plateau.关键词
青藏高原/土壤粒级分布/土壤有机碳/矿化速率Key words
Qinghai-Tibet Plateau/soil particle size distribution/soil organic carbon(SOC)/mineralization rate引用本文复制引用
王静,李旭东,韩天虎,牛得草,白春利,郭丁..高寒草甸不同草地微斑块土壤团聚体分布及其与有机碳矿化的关系[J].草业学报,2026,35(2):15-27,13.基金项目
甘肃省林业和草原局(QYRZ-GSLC2023-009),国家自然科学基金(31502010),青藏高原环境与生态教育部重点实验室开放基金(2018-QHS-K07)和甘肃省自然科学基金重点项目(22JR5RA400)资助. （QYRZ-GSLC2023-009）
