干旱
环境科学
植被(病理学)
土壤碳
横断面
风积作用
温带气候
腐蚀
土壤科学
土壤水分
碳纤维
生态系统
生物结皮
碳循环
天蓬
生态学
土壤结构
水文学(农业)
大气科学
成土作用
全球变化
固碳
农学
土壤肥力
土壤有机质
自行车
土壤生物多样性
作者
Yuntao Wu,Josep Peñuelas,Jalaid Naersige,Jie Luo,Heng Ge,Xingming Zhang,Pengfei Chang,Ping Li,Lingli Liu
标识
DOI:10.1021/acs.est.5c07643
摘要
Intensified aridity beyond a critical threshold could disrupt vegetation, microbial, and soil processes, reshaping the mechanisms controlling soil carbon (C) storage in drylands. However, the aridity threshold at which the transition occurs and how the controls over different soil C fractions shift remain unclear. Here, we conducted a 2400 km transect survey across 45 sites spanning a broad aridity gradient in temperate grasslands of China. We identified a pronounced shift in the dominant drivers of soil C storage at an aridity threshold of 0.749. Below this threshold, complex vegetation structures enhanced soil C by promoting microbial activity and mineral abundance, which stimulated the accumulation of both POM and MAOM, with a stronger effect on POM. Above the threshold, fine roots dominated soil biochemical processes, sustaining microbial activity and mineral formation that indirectly stabilized SOC, particularly via MAOM. Across the entire aridity gradient, vegetation structure mediated surface soil susceptibility to wind erosion with complex structures providing effective protection, while simpler structures offered limited buffering. These findings highlight the dual role of vegetation-mediated C input and wind erosion protection in sustaining soil stocks in drylands, underscoring the need to account for canopy and root structure when species are selected for dryland restoration.
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