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
作者： Tian, Lihua 1 ; Bai, Yanfu 2 ; Wang, Weiwei 2 ; Qu, Guangpeng 4 ; Deng, Zhaoheng 5 ; Li, Ruicheng 6 ; Zhao, Jingxue 2 ;
作者机构： 1.Southwest Minzu Univ, Inst Qinghai Tibetan Plateau, Chengdu 610041, Peoples R China
2.Lanzhou Univ, State Key Lab Grassland Agroecosyst, Inst Innovat Ecol, Lanzhou 730000, Peoples R China
3.Lanzhou Univ, Coll Life Sci, Lanzhou 730000, Peoples R China
4.State Key Lab Hulless Barley & Yak Germplasm Reso, Lhasa 850002, Peoples R China
5.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol, Beijing 100101, Peoples R China
6.Peking Univ, Dept Ecol, Coll Urban & Environm Sci, 5 Yiheyuan Rd, Beijing 100871, Peoples R China
7.Peking Univ, Key Lab Earth Surface Proc, Minist Educ, 5 Yiheyuan Rd, Beijing 100871, Peoples R China
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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