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Effects of grazing on soil spatial heterogeneity depend on herbivore assemblages and components of heterogeneity
被引:0
作者:
Bai, Yue
[1
]
Xu, Tongtong
[1
]
Huang, Yue
[2
,3
]
Song, Mingrui
[1
]
Xie, Beilong
[1
]
Zhang, Lei
[1
]
Wu, Jiaru
[1
]
Liu, Chen
[1
]
机构:
[1] Northwestern Polytech Univ, Sch Ecol & Environm, Shaanxi Key Lab Qinling Ecol Intelligent Monitorin, Xian 710129, Peoples R China
[2] Northeast Normal Univ, Inst Grassland Sci, Jilin Songnen Grassland Ecosyst Natl Observat & Re, Key Lab Vegetat Ecol,Minist Educ, Changchun 130024, Peoples R China
[3] Chinese Acad Sci, CAS Key Lab Forest Ecol & Management, Inst Appl Ecol, Shenyang 110016, Peoples R China
基金:
中国博士后科学基金;
关键词:
Compositional heterogeneity;
Configurational heterogeneity;
Geostatistics;
Grassland ecosystem;
Herbivore grazing;
Soil limiting resources;
PLANT-SPECIES DIVERSITY;
LANDSCAPE HETEROGENEITY;
VEGETATION STRUCTURE;
N MINERALIZATION;
ORGANIC-CARBON;
NITROGEN;
VARIABILITY;
NUTRIENTS;
COMMUNITIES;
PATTERN;
D O I:
10.1016/j.still.2025.106520
中图分类号:
S15 [土壤学];
学科分类号:
0903 ;
090301 ;
摘要:
The spatial heterogeneity of soil limiting resources, particularly nitrogen (N) and phosphorus (P), are vital for maintaining grassland productivity, biodiversity, and ecosystem functions. Grazing by large herbivores is a prevalent land use in grasslands, significantly modifying nutrient cycling and spatial heterogeneity. However, the differential impacts of various herbivore assemblages on the spatial heterogeneity of soil N and P, and their association with heterogeneity components (compositional and configurational heterogeneity), remain inadequately understood. Here, we conducted a 7-year field experiment in the Horqin sandy grassland of northeast China to assess the effects of different herbivore assemblages (no grazing, cattle grazing, sheep grazing, and mixed grazing of cattle and sheep) on the spatial heterogeneity of soil N and P. Our findings indicate that the effects of herbivore grazing on spatial heterogeneity of soil limiting resources are strongly dependent on herbivore assemblages and the components of heterogeneity. All herbivore species impacted soil configurational heterogeneity, while their impact on compositional heterogeneity was negligible. This suggests that grazing primarily modifies the spatial distribution patterns of limiting resources rather than altering nutrient content variability. Variation partitioning analysis revealed that herbivore grazing increased the spatial heterogeneity of soil N and P mainly by changing the plant community characteristics, such as diversity and composition, with a lesser contribution from the direct return of animal excreta. Cattle grazing significantly increased plant community heterogeneity and legume abundance, leading to increased configurational heterogeneity of all soil limiting resources, especially inorganic N. In contrast, mixed grazing and sheep grazing exhibited inconsistent effects on soil configurational heterogeneity, ranging from weak to strong spatial dependence. Our results suggest cattle grazing plays a significant role in promoting the spatial heterogeneity of both plant community and soil limiting resources in intensively managed grasslands. We emphasize that configurational heterogeneity is highly sensitive and critical for evaluating the responses of grazing on soil nutrient heterogeneity, providing valuable evidence for the spatial impacts of large herbivores on grassland ecosystems.
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页数:12
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