干旱区生态环境知识资源中心(Arid): Grazing Decreases Soil Aggregation and Has Different Effects on Soil Organic Carbon Storage across Different Grassland Types in Northern Xinjiang, China

Arid

DOI	10.3390/land12081575
	Grazing Decreases Soil Aggregation and Has Different Effects on Soil Organic Carbon Storage across Different Grassland Types in Northern Xinjiang, China
	Fan, Lianlian; Liang, Yuanye; Li, Xiaofeng; Mao, Jiefei; Wang, Guangyu; Ma, Xuexi; Li, Yaoming
通讯作者	Li, YM
来源期刊	LAND
EISSN	2073-445X
出版年	2023
卷号	12 期号:8
英文摘要	Soil aggregates, as the basic component of soil, make great contributions to the stability of soil structure and soil carbon (C) sequestration. Recently, grasslands have been experiencing continuous grazing, which has had a significant impact on soil aggregation and soil C storage. However, how soil aggregates and soil C in different grasslands respond to grazing remains unclear. Therefore, three national fenced grassland-monitoring sites that represented mountain meadow (MM), temperate steppe (TS), and temperate steppe desert (TSD) were selected to investigate the differences in the responses of soil aggregates and soil C among grazing of different types of grasslands. Soil samples of 0-10 cm was collected from both inside and outside the fence of each site to analyze soil properties and soil aggregate characteristics. The results showed that soil nutrients varied greatly among the three grassland types, with the highest values in MM. At each site, grazing increased the content of sand and decreased the contents of silt and clay compared to fenced plots. Soil aggregate composition showed significant responses to both grassland type and grazing, especially the proportions of soil aggregates >2 mm, which significantly decreased by 51.7% on average in grazing plots compared with fenced plots. A significant decrease (on average, 25.1%) in the mean weight diameter (MWD) of soil aggregates under grazing was detected across all grassland types. The effect of grazing on nutrients in macroaggregates (>0.25 mm) was greater than that in microaggregates (<0.25 mm). Aggregate-associated SOC concentration decreased under grazing in MM and TS. However, grazing had no significant influence on the SOC density of MM, while it led to a significant decrease in TS and an increase in TSD. The magnitude of grazing effect size on aggregate-associated SOC varied with different soil particle sizes, with greater responses in aggregates >2 mm and the biggest value in TDS. In addition, the results of the correlation analysis and redundancy analysis (PDA) indicated that soil bulk density and nutrients made the main contribution to soil composition and stability of soil aggregates. Overall, grazing had a significant influence on soil aggregation, stability, and SOC, playing a crucial role in grassland soil stability and the accumulation of SOC.
英文关键词	grazing grassland type soil aggregates aggregates stability nutrients
类型	Article
语种	英语
开放获取类型	Green Submitted, gold
收录类别	SSCI
WOS记录号	WOS:001055489100001
WOS关键词	MOUNTAIN-BASIN SYSTEM ; ASIA ARID REGIONS ; NITROGEN ; STABILITY ; VEGETATION ; STEPPE ; RESTORATION ; PHOSPHORUS ; ECOTONE ; MATTER
WOS类目	Environmental Studies
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397681
推荐引用方式 GB/T 7714	Fan, Lianlian,Liang, Yuanye,Li, Xiaofeng,et al. Grazing Decreases Soil Aggregation and Has Different Effects on Soil Organic Carbon Storage across Different Grassland Types in Northern Xinjiang, China[J],2023,12(8).
APA	Fan, Lianlian.,Liang, Yuanye.,Li, Xiaofeng.,Mao, Jiefei.,Wang, Guangyu.,...&Li, Yaoming.(2023).Grazing Decreases Soil Aggregation and Has Different Effects on Soil Organic Carbon Storage across Different Grassland Types in Northern Xinjiang, China.LAND,12(8).
MLA	Fan, Lianlian,et al."Grazing Decreases Soil Aggregation and Has Different Effects on Soil Organic Carbon Storage across Different Grassland Types in Northern Xinjiang, China".LAND 12.8(2023).