Changes and Relationships between Components in the Plant-Soil System and the Dominant Plant Functional Groups in Alpine Kobresia Meadows Due to Overgrazing
文献类型：期刊论文
| 作者 | Lin, Li1,2; Cao, Guangmin1; Xu, Xingliang3; Li, Chunli4; Fan, Bo1; Li, Bencuo1; Lan, Yuting1; Si, Mengke1; Dai, Licong5 |
| 刊名 | DIVERSITY-BASEL
 |
| 出版日期 | 2022-03-01 |
| 卷号 | 14期号:3页码:18 |
| 关键词 | alpine meadow multi-stable state soil nutrient soil microorganism plant community stoichiometry overgrazing |
| DOI | 10.3390/d14030183 |
| 通讯作者 | Cao, Guangmin(caogm@nwipb.cas.cn) ; Xu, Xingliang(xuxingl@hotmail.com) |
| 英文摘要 | In the last several decades, overgrazing has led to various changes in the plant communities, soil nutrients and soil microbial communities in alpine Kobresia meadows, which contain various plant communities coexisting on the Qinghai-Tibet Plateau. Investigating the variations in the biomass and concentration of nutrients in the plant-soil system in these communities may improve understanding of the biochemical responses and adaptation strategies they use to resist disturbances due to overgrazing. We therefore assessed 12 factors across four grazing intensities in alpine Kobresia meadows to explore the following three questions. (1) What the responses are in alpine Kobresia meadows to overgrazing. (2) How they affect plant-soil systems in alpine Kobresia meadows under overgrazing. (3) What factors can be used to evaluate the effects of overgrazing on the ecosystem health status of alpine Kobresia meadows. The results gave the following answers to the above questions. (1) Overgrazing caused the total aboveground biomass to decrease from 333.2 +/- 17.4 g/m(2) to 217.4 +/- 30.2 g/m(2), the coverage of plant functional groups of Gramineae and Cyperaceae to decrease from 74.2 +/- 3% to 22.5 +/- 1.9%, and the total belowground biomass to increase from 4028.5 +/- 7.3 g/m(2) to 6325.6 +/- 24.8 g/m(2). (2) Overgrazing resulted in variations in plant-soil systems at three levels. The concentrations of carbon (C) in soil nutrients and plant communities, explained 50.9% of the variation of biomass in plant functional groups; the concentration of soil available nutrients, explained 22.2% of the variation; and the ratio of C and N in shoots and soil total N, explained 11.0% of the variation. (3) The variations in C/N stoichiometry in total soil nutrients and soil microorganisms were 3.4-8.4% and 2.0-3.0%, respectively, and the load of (ammonium-nitrogen (NH4+-N) + nitrate-nitrogen (NO3--N)) to growth of roots tissue increased from 84.1 +/- 5.0 g/m(2)/(mg/kg) via 99.0 +/- 1.3 g/m(2)/(mg/kg) to 86.1 +/- 2.1 g/m(2)/(mg/kg) at 0 to 40 cm soil in an alpine meadow with grazing intensities rising. Overgrazing would thus increase the deficit of those two kinds of inorganic N on roots growing by 11.4%, 17.7% and 2.4% as grazing rates increased by 93.3%, 126.7% and 213.3%, respectively, compared to a meadow grazed at the lowest rate in the research. We concluded that the alpine meadow changed its distribution of biomass in the plant community, which increased the limiting nutrient deficit on production and altered the concentration and ratio of C and N. This destroyed the original balance to enable the plant community to resist overgrazing. Plot "KH"-a pasture with a grazing intensity next to the lowest one-was the key state in which persistent overgrazing could increase the limiting nutrient load on plant community production, change the dominant position of functional plant groups and species, and lead to plant community degradation. Using ratio of Gramineae to Cyperaceae or Kobresia humilis to K. pygmaea to monitor plant community succession could indirectly estimate these limiting nutrients deficit and balance, and their strategy for incorporating matter into roots and shoots. However how to use those outward characteristics to assess the ecosystem health requires further studies. |
| WOS关键词 | ECOLOGICAL STOICHIOMETRY ; ECOSYSTEM STRUCTURE ; ORGANIC-MATTER ; NITROGEN ; GRASSLAND ; CARBON ; MICROORGANISMS ; DEGRADATION ; COMPETITION ; DIVERSITY |
| 资助项目 | Natural Science Foundation of Qinghai Province[2020-ZJ-720] ; Nutrient Regulation Technology System for Grassland Recovery[2019YFC0507704] |
| WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000775514300001 |
| 出版者 | MDPI |
| 资助机构 | Natural Science Foundation of Qinghai Province ; Nutrient Regulation Technology System for Grassland Recovery |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/173633]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Cao, Guangmin; Xu, Xingliang |
| 作者单位 | 1.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810008, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 130028, Peoples R China 4.Qinghai Univ, State Key Lab Plateau Ecol & Agr, Xining 810016, Peoples R China 5.Hainan Univ, Coll Ecol & Environm, Haikou 570228, Hainan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lin, Li,Cao, Guangmin,Xu, Xingliang,et al. Changes and Relationships between Components in the Plant-Soil System and the Dominant Plant Functional Groups in Alpine Kobresia Meadows Due to Overgrazing[J]. DIVERSITY-BASEL,2022,14(3):18. |
| APA | Lin, Li.,Cao, Guangmin.,Xu, Xingliang.,Li, Chunli.,Fan, Bo.,...&Dai, Licong.(2022).Changes and Relationships between Components in the Plant-Soil System and the Dominant Plant Functional Groups in Alpine Kobresia Meadows Due to Overgrazing.DIVERSITY-BASEL,14(3),18. |
| MLA | Lin, Li,et al."Changes and Relationships between Components in the Plant-Soil System and the Dominant Plant Functional Groups in Alpine Kobresia Meadows Due to Overgrazing".DIVERSITY-BASEL 14.3(2022):18. |
入库方式： OAI收割
来源：地理科学与资源研究所
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