草业科学2026，Vol.43Issue(8)：1927-1939,13.DOI:10.11829/j.issn.1001-0629.2026-0107
青藏高原东北边缘区不同草地类型碳密度及其影响因素研究
Carbon density and influencing factors of different grassland types in the northeastern marginal area of the Qinghai-Xizang Plateau
摘要
Abstract
Carbon density varies among grassland types owing to differences in productivity and soil properties.This study focused on the northeastern marginal area of the Qinghai-Xizang Plateau.Based on systematic investigations at 108 sampling sites and laboratory analyses,this study aimed to reveal the carbon density patterns of different grassland types and their key influencing factors.The results indicate that within the study area,vegetation and soil carbon densities decreased significantly along a gradient from alpine meadow,mountain meadow,and temperate meadow steppe to temperate steppe.The alpine meadow exhibited the highest carbon density,whereas the temperate steppe displayed the lowest.Belowground root biomass constituted the predominant component of the ecosystem carbon pool,accounting for an average proportion exceeding 60%.Grassland types differed in the dominant component of their carbon density:Soil inorganic carbon dominated in the temperate steppe and temperate meadow steppe,while soil organic carbon prevailed in the alpine meadow and montane meadow,contributing 65.87%-91.34%of the soil carbon pool.The carbon density in alpine meadows was synergistically regulated by the slope aspect and plant species richness,whereas that in montane meadows was influenced by multiple factors including the grazing intensity,slope position,and vegetation coverage.In temperate steppes,the carbon density was primarily controlled by grazing management regimes,whereas in temperate meadow steppes,it was predominantly governed by altitudinal gradients.These findings provide a scientific basis for implementing"zoning-classification-grading"precision management for different grassland types in the northeastern margin of the Qinghai-Xizang Plateau and for enhancing regional carbon sink capacity.关键词
青藏高原东北边缘区/山地草甸/高寒草甸/温性草原/温性草甸草原/碳密度/影响因素Key words
the northeastern marginal area of the Qinghai-Xizang Plateau/mountain meadow/alpine meadow/temperate steppe/temperate meadow steppe/carbon density/influencing factors引用本文复制引用
张永辉,张蔚,高丽丽,俞慧云,莫负涛,施昌玉,刘兴明..青藏高原东北边缘区不同草地类型碳密度及其影响因素研究[J].草业科学,2026,43(8):1927-1939,13.基金项目
甘肃省林草科技创新项目(LCCX202608) （LCCX202608）
甘肃省林业和草原科技项目(2022kj074) （2022kj074）
