Effects of herbivore assemblage on the spatial heterogeneity of soil nitrogen in eastern Eurasian steppe
Effects of herbivore assemblage on the spatial heterogeneity of soil nitrogen in eastern Eurasian steppe
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欧亚东部草原草食动物组合对土壤氮空间异质性的影响
DOI：
10.1111/1365-2664.13655
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发表时间：
2020-05
影响因子：
5.7
通讯作者：
Deli Wang
中科院分区：
文献类型：
--
作者：
Minna Zhang;Guangyin Li;Bai Liu;Jushan Liu;Ling Wang;Deli Wang
土壤限制资源的空间异质性是维持生物多样性和生态系统功能的重要因素之一。草食动物放牧在改变土壤资源异质性中起着核心作用，这是一个普遍关注的问题。然而，大多数研究都研究了大型食草动物作为一个群体如何影响土壤异质性。不同草食动物组合如何影响土壤异质性，以及草食动物组合效应是否会因草地类型而异，这些方面的知识有限。通过4年的放牧试验，研究了不同食草动物组合（不放牧、牛放牧、羊放牧和牛羊混合放牧）对欧亚东部草原3种草地类型（草甸草原、典型草原和荒漠草原）土壤氮有效性空间异质性的影响。结果表明：所有草食放牧均增加了不同降水条件下3个草原土壤氮有效性的异质性（草甸草原只有放牛和牛羊混放牧未达到统计学显著水平）。土壤氮有效性异质性的持续增加主要是由于动物排泄物的增加，而在干燥草原，动物排泄物分解速度较慢，这种影响减弱。此外，绵羊排泄物对土壤氮异质性的贡献大于其他食草动物组合，且在草甸草原和典型高降水草原的影响具有统计学意义。合成与应用。研究表明，在高降水草地生态系统中，绵羊比牛更有可能维持和增强草地异质性。因此，我们认为管理地上食草动物对保护和促进草地土壤异质性具有重要意义，并且管理还应考虑当地的环境条件，如降水。
The spatial heterogeneity of soil limiting resources is one of the most important factors maintaining biodiversity and ecosystem functions. There is a general concern that herbivore grazing plays a central role in modifying soil resources heterogeneity. However, most studies have examined how large herbivores as a group affect soil heterogeneity. There is limited knowledge about how assemblages of different herbivore species may influence soil heterogeneity, and whether the herbivore assemblage effects might vary with grassland types.Here we conducted a 4‐year grazing experiment to examine 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 availability across three types of grasslands (meadow steppe, typical steppe and desert steppe) in eastern Eurasian steppe.The results showed that all the herbivore grazing increased the heterogeneity of soil N availability in the three grasslands with different precipitation (only cattle grazing and mixed grazing of cattle and sheep in meadow steppe did not reach a statistically significant level). The consistently increased heterogeneity of soil N availability was primarily due to the effect of animal excreta addition, which weakened in drier grasslands, likely because of the slower excreta decomposition. Moreover, sheep excreta contributed more to soil N heterogeneity than that of other herbivore assemblages, and the effect was statistically significant in meadow steppe and typical steppe with relative high precipitation.Synthesis and applications. Our study indicates that sheep could have larger potential to maintain and enhance grassland heterogeneity than cattle especially in grassland ecosystems with high precipitation. We therefore suggest that managing above‐ground herbivore species is important for conserving and promoting grassland soil heterogeneity, and that the management should also take into account local environmental conditions such as precipitation.
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影响因子：
2.9
作者：
HUSTON, M
通讯作者：
HUSTON, M
DOI：
10.1002/eap.1640
发表时间：
2018
期刊：
Ecological applications : a publication of the Ecological Society of America
影响因子：
--
作者：
Jingzhi Wang;Deli Wang;Chunqiang Li;T. Seastedt;C. Liang;Ling Wang;Wei Sun;Maowei Liang;Yu Li
通讯作者：
Jingzhi Wang;Deli Wang;Chunqiang Li;T. Seastedt;C. Liang;Ling Wang;Wei Sun;Maowei Liang;Yu Li
影响因子：
5.7
作者：
C. C. Schwartz-C.;J. Ellis
通讯作者：
C. C. Schwartz-C.;J. Ellis
影响因子：
2.8
作者：
Riin Tamme;Inga Hiiesalu;L. Laanisto;R. Szava-Kovats;M. Pärtel
通讯作者：
Riin Tamme;Inga Hiiesalu;L. Laanisto;R. Szava-Kovats;M. Pärtel
影响因子：
1.6
作者：
Aeschbacher, J;Liniger, H;Weingartner, R
通讯作者：
Weingartner, R