希拉穆仁草原不同放牧强度植被群落特征对土壤团聚体的影响
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1.山东农业大学林学院/泰山森林生态系统定位研究站;2.水利部牧区水利科学研究所

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基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)(42177347,51879155);中国水利水电科学研究院内蒙古阴山北麓草原生态水文国家野外科学观测研究站开放研究基金(YSS202104)


Effects of vegetation community characteristics under different grazing intensities on soil aggregates in Xilamuren grassland
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Affiliation:

1.College of Forestry, Shandong Agricultural University, Taishan Forest Ecosystem Research Station;2.Co-Innovation Center for Soil-Water and Forest-Grass Ecological Conservation in Yellow River Basin of Shandong Higher Education Institutions

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)(42177347,51879155);Open Research Fund of Yinshanbeilu National Field Research Station of steppe Eco-hydrological System, China Institute of Water Resources and Hydropower Research (YSS202104)

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    摘要:

    [目的]植被群落是影响土壤团聚体的重要因素,然而针对放牧压力下植被群落的改变对土壤团聚体的影响程度仍不明晰。[方法]以希拉穆仁荒漠草原控制放牧试验区为研究对象,采用野外调查、室内分析相结合的方法,分析了轻度放牧(LG)、中度放牧(MG)、重度放牧(HG)和禁牧(CK)下植被群落特征和土壤团聚体特征及二者的关系,揭示了植物群落变化对土壤团聚体的影响。[结果](1)植物群落物种数随放牧强度的增加而增加,LG的群落Shamnon-Wiener多样性指数(H")和Simpson优势度指数(D)显著低于其他放牧强度(P<0.05)。地上生物量随放牧强度的增加而降低,HG的地上生物量显著低于其他放牧强度(P<0.05)。不同放牧强度下地下生物量差异显著,且不同土层的地下生物量均以LG最高。(2)平均重量直径(MWD)和几何平均直径(GMD)的变化趋势与大团聚体含量一致,在0-5 cm和5-10 cm土层表现为随放牧强度的增加先增加后降低再增加(LG最高、MG最低)。(3)群落Shamnon-Wiener多样性指数(H")、Pielous均匀度指数(J")、地上生物量、容重、有机碳和全氮含量是影响大团聚体含量、MWD和GMD的显著性因子(P<0.05)。[结论]研究结果可以为希拉穆仁草原合理放牧以及生态恢复工作提供理论支撑和科学依据。

    Abstract:

    [Objective] Vegetation community is an important factor affecting soil aggregates. However, the impact of changes in vegetation communities on soil aggregates under grazing pressure is still unclear. [Method] Taking Xilamuren Desert Steppe as the research object, the characteristics of vegetation community and soil aggregates under light grazing (LG), moderate grazing (MG), heavy grazing (HG) and no grazing (CK) and their relationship were analyzed by field investigation and indoor analysis. The effects of plant community changes on soil aggregates were revealed. [Results] (1) The number of plant community species increased with the increase of grazing intensity. The Shamnon-Wiener diversity index (H") and Simpson dominance index (D) of LG community were significantly lower than those of other grazing intensities (P<0.05). The aboveground biomass decreased with the increase of grazing intensity, and the aboveground biomass of HG was significantly lower than that of other grazing intensities (P<0.05). The underground biomass under different grazing intensities was significantly different, and the underground biomass of different soil layers was the highest in LG. (2) The change trend of mean weight diameter (MWD) and geometric mean diameter (GMD) was consistent with the content of macroaggregates. In 0-5 cm and 5-10 cm soil layers, it increased first, then decreased and then increased with the increase of grazing intensity (LG was the highest and MG was the lowest). (3) The community Shamnon-Wiener diversity index (H"), Pielous evenness index (J"), aboveground biomass, bulk density, organic carbon and total nitrogen content were significant factors affecting macroaggregate content, MWD and GMD (P<0.05). [Conclusion] The research results can provide theoretical support and scientific basis for rational grazing and ecological restoration in Xilamuren grassland.

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  • 收稿日期:2023-12-28
  • 最后修改日期:2024-01-29
  • 录用日期:2024-01-29
  • 在线发布日期: 2024-04-29
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