Warm- and cold- season grazing affect plant diversity and soil carbon and nitrogen sequestration differently in Tibetan alpine swamp meadows

文献类型： 外文期刊

第一作者： Tian, Lihua

作者： Tian, Lihua;Bai, Yanfu;Wang, Weiwei;Zhao, Jingxue;Bai, Yanfu;Wang, Weiwei;Zhao, Jingxue;Qu, Guangpeng;Zhao, Jingxue;Deng, Zhaoheng;Li, Ruicheng;Zhao, Jingxue;Li, Ruicheng;Zhao, Jingxue

作者机构：

关键词： Grazing practices; Diversity conservation; Litter mass; Grassland restoration; Alpine grasslands

期刊名称：PLANT AND SOIL （ 影响因子：4.993； 五年影响因子：5.44 ）

ISSN： 0032-079X

年卷期： 2021 年 458 卷 1-2 期

页码：

收录情况： SCI

摘要： Background and aims Seasonal grazing is a traditional grassland management practice in alpine swamp meadows on the Tibetan Plateau, but little information is available on the interactions between plant diversity and soil carbon and nitrogen sequestration in warm- and cold- season grazed alpine swamp meadows. Methods A multisite survey was conducted to investigate the plant characteristics and soil properties of Tibetan alpine swamp meadows under warm-season grazing (WG) and cold-season grazing (CG). Results Our study showed that plant biomass, litter mass, soil water content (SW), soil available nitrogen, soil microbial biomass carbon and nitrogen were significantly lower in the WG meadows than in the CG meadows (P < 0.05). However, plant diversity, species richness and the evenness index tended to increase in the WG meadows. Soil C and N storage were significantly lower in the WG meadows than in the CG meadows (P < 0.01). Grazing-induced changes in SW, plant diversity, plant biomass and litter mass were the major factors resulting in the decrease in soil C and N storage. Conclusions Our results indicate that warm-season grazing is beneficial for species diversity conservation, whereas cold-season grazing is suitable for soil C and N sequestration in alpine swamp meadows. Grazing-induced changes in litter mass greatly contributed to variations in plant diversity and soil C and N storage. In view of the accelerated vegetation and soil degradation in alpine grasslands, periodic warm- and cold-season grazing strategies should be considered to maintain alpine swamp meadow sustainability.

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