Soil environment and annual rainfall co-regulate the response of soil respiration to different grazing intensities in saline-alkaline grassland

放牧 环境科学 土壤呼吸 草原 土壤碳 农学 非生物成分 生态系统 土壤水分 生态系统呼吸 生态学 初级生产 土壤科学 生物
作者
Huajie Diao,Jie Hao,Qianwen Yang,Yangyang Gao,Tianjiao Ma,Fuzhu Han,Wenjun Liang,Jie Chang,L. H. Yi,Guibin Pang,Dong Kuan-hu,Changhui Wang
出处
期刊:Catena [Elsevier]
卷期号:236: 107709-107709
标识
DOI:10.1016/j.catena.2023.107709
摘要

Grazing is a prevalent management strategy in grassland ecosystems that has profound effects on plants and soil microorganisms, consequently altering soil carbon (C) fluxes. However, the difference responses and regulatory mechanisms of soil autotrophic respiration (SRa) and heterotrophic respiration (SRh) to different grazing intensities remain unclear, especially in saline-alkaline grasslands. A six–year (2017–2022) field experiment involving four grazing intensities (no grazing, light grazing, moderate grazing, and heavy grazing) was conducted in a saline-alkaline grassland located in the agro-pastoral ecotone of northern China. Soil total respiration (SRtot) and its components (SRa and SRh), and the related biotic and abiotic factors (plants, soil microorganisms, and soil environment) were measured. The results showed that light grazing significantly decreased the mean SRh by 17.7% across six measuring years. The effects size of grazing on soil respiration fluctuated consistently with soil water content during the growing seasons (May–September), resulting in a neutral effect of grazing on the seasonal mean SRa. The cumulative soil C emissions of the current year varied with the seasonal precipitation in the previous year, whereas the changes in cumulative soil C emissions induced by grazing showed the same trends as annual precipitation. In addition, the key control factors for SRh and SRa differed and varied with grazing intensity and the soil environment played a critical role in regulating soil C fluxes. In conclusion, light grazing reduces soil microbial-driven C emissions and the soil environment and precipitation co-regulate the response of soil C fluxes to different grazing intensities in saline-alkaline grasslands.
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