Overgrazing decreases soil organic carbon stocks the most under dry climates and low soil pH: A meta-analysis shows
Overgrazing decreases soil organic carbon stocks the most under dry climates and low soil pH: A meta-analysis shows
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DOI：
10.1016/j.agee.2016.01.026
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发表时间：
2016-04-01
影响因子：
6.6
通讯作者：
Chaplot, Vincent
中科院分区：
文献类型：
--
作者：
Dlamini, Phesheya;Chivenge, Pauline;Chaplot, Vincent
草地约占全球陆地面积的40%，储存着全球约10%的土壤有机碳。这SOC池，其中较大的比例是在表土（0-0.3英寸），草地管理的强烈影响。尽管如此，目前还没有完全了解草地SOC库存如何应对退化，特别是在全球不同的环境条件下。本综述的目的是阐明草地退化对SOC储量变化的影响以及全球范围内的主要环境控制措施，作为恢复的先决条件。利用温带、湿润、亚湿润、热带和半干旱条件下的55项研究、628个土壤剖面进行了全面的荟萃分析，比较了非退化和退化草原土壤表层土壤的SOC储量。在干旱气候（1000 mm）下，草原退化使SOC储量显著减少16%，亚洲是受影响最严重的大陆（-23.7%）。此外，SOC股票的损耗引起的退化更明显的桑迪（= 32%粘土）土壤。此外，草地退化显著降低了14%的酸性土壤（pH
Grasslands occupy about 40% of the world's land surface and store approximately 10% of the global soil organic carbon (SOC) stock. This SOC pool, in which a larger proportion is held in the topsoil (0-0.3 in), is strongly influenced by grassland management. Despite this, it is not yet fully understood how grassland SOC stocks respond to degradation, particularly for the different environmental conditions found globally. The objective of this review was to elucidate the impact of grassland degradation on changes in SOC stocks and the main environmental controls, worldwide, as a prerequisite for rehabilitation. A comprehensive meta-analysis was conducted using 55 studies with 628 soil profiles under temperate, humid, sub-humid, tropical and semi-arid conditions, to compare SOC stocks in the topsoil of non degraded and degraded grassland soils. Grassland degradation significantly reduced SOC stocks by 16% in dry climates (1000 mm) and Asia was the most affected continent (-23.7%). Moreover, the depletion of SOC stock induced by degradation was more pronounced in sandy (= 32% clay) soils. Furthermore, grassland degradation significantly reduced SOC by 14% in acidic soils (pH