Long-term active restoration of extremely degraded alpine grassland accelerated turnover and increased stability of soil carbon
文献类型：期刊论文
| 作者 | Bai, Yanfu; Ma, Lina; Degen, Abraham A.; Rafiq, Muhammad K.; Kuzyakov, Yakov; Zhao, Jingxue; Zhang, Rui; Zhang, Tao; Wang, Wenyin; Li, Xiaogang |
| 刊名 | GLOBAL CHANGE BIOLOGY
 |
| 出版日期 | 2020 |
| 关键词 | active restoration soil organic matter mineralization soil warming structural equation model Tibetan grassland topsoil and subsoil |
| 英文摘要 | Soil nutrient contents and organic carbon (C) stability are key indicators for restoration of degraded grassland. However, the effects of long-term active restoration of extremely degraded grassland on soil parameters have been equivocal. The aims of this study were to evaluate the impact of active restoration of degraded alpine grassland on: (a) soil organic matter (SOM) mineralization; and (b) the importance of biotic factors for temperature sensitivity (Q(10)) of SOM mineralization. Soils were sampled from intact, degraded and restored alpine grasslands at altitudes ranging between 3,900 and 4,200 m on the Tibetan Plateau. The samples were incubated at 5, 15 and 25 degrees C, andQ(10)values of SOM mineralization were determined. Structural equation modeling was used to evaluate the importance of vegetation, soil physico-chemical properties and microbial parameters forQ(10)regulation. TheQ(10)of N mineralization was similar among intact, degraded and restored soils (0.84-1.24) and was higher in topsoil (1.09) than in subsoil (0.92). The best predictive factor of CO2-Q(10)for intact grassland was microbial biomass, for degraded grassland was basal microbial respiration, and for restored grassland was soil bulk density. Restoration by planting vegetation decreased theQ(10)of SOM mineralization as soil bulk density, the most important negative predictor, increased in restored grassland. TheQ(10)of SOM mineralization in topsoil was 14% higher than in subsoil because of higher microbial abundance and exo-enzyme activities. The NH(4)(+)content was greatest in intact soil, while NO(3)(-)content was greatest in degraded soil. The SOM mineralization rate decreased with grassland degradation and increased after long-term (>10 years) restoration. In conclusion, extremely degraded grassland needs proper long-term management in active restoration projects, especially for improvement of soil nutrients in a harsh environment. |
| 源URL | [http://210.75.249.4/handle/363003/60228]  |
| 专题 | 西北高原生物研究所_中国科学院西北高原生物研究所 |
| 推荐引用方式 GB/T 7714 | Bai, Yanfu,Ma, Lina,Degen, Abraham A.,et al. Long-term active restoration of extremely degraded alpine grassland accelerated turnover and increased stability of soil carbon[J]. GLOBAL CHANGE BIOLOGY,2020. |
| APA | Bai, Yanfu.,Ma, Lina.,Degen, Abraham A..,Rafiq, Muhammad K..,Kuzyakov, Yakov.,...&Shang, Zhanhuan.(2020).Long-term active restoration of extremely degraded alpine grassland accelerated turnover and increased stability of soil carbon.GLOBAL CHANGE BIOLOGY. |
| MLA | Bai, Yanfu,et al."Long-term active restoration of extremely degraded alpine grassland accelerated turnover and increased stability of soil carbon".GLOBAL CHANGE BIOLOGY (2020). |
入库方式： OAI收割
来源：西北高原生物研究所
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