| Pasture degradation impact on soil carbon and nitrogen fractions of alpine meadow in a Tibetan permafrost region | |
Yuan, Zi-Qiang; Wu, Qing-Bai; Song, Xin1; Jiang, Xiao-Jin ; Gao, Si-Ru; Wang, Qing-Feng; Li, Guo-Yu
| |
| 2020 | |
| Source Publication | JOURNAL OF SOILS AND SEDIMENTS
 |
| ISSN | 1439-0108 |
| Volume | 20Issue:5Pages:2330-2342 |
| Abstract | Purpose Knowledge of the effects of pasture degradation on soil organic carbon (SOC) and nitrogen (N) fractions in permafrost soils on the Tibetan Plateau is limited. The aims of this study were (1) to evaluate the changes in SOC and N contents in density fractions under Kobresia pasture due to degradation and (2) to explore the contributions of the changes of SOC and N in density fractions to the changes of SOC and N in whole soil. Materials and methods The impact of Kobresia pasture degradation on SOC and N fractions was investigated in the permafrost region of the Tibetan Plateau. A continuously degraded pasture was identified and classified into three categories of vegetation cover according to their degrees of degradation (i.e., vegetation cover decline from 90% +/- 6.6% to 70% +/- 8.3% and 45% +/- 8.7%). The SOC and N fractions were separated by using the density separation method. Results and discussion The Kobresia pasture degradation significantly decreases SOC and N contents and stocks in soils. The SOC and N contents in the whole soil were positively correlated with the SOC and N contents in the light and heavy fractions (p < 0.001, respectively). The SOC and N contents were significantly correlated with soil pH and the contents of soil moisture, clay, silt, and sand. The ratio of SOC to total N in the whole soil was positively correlated with the ratio of SOC to N in heavy fractions (p < 0.001) rather than the ratio of SOC to N in light factions (p > 0.05). When pasture degraded from vegetation covers 90% to 45%, SOC stock at 0-40-cm soil layer decreased by 28.7% and N stock decreased by 39.2% in the whole soil; 56.6% and 47.6%, respectively, in the light fractions and 14.3% and 40.6%, respectively, in the heavy fractions. The depletion rates of N were higher than those of SOC in the heavy fractions and whole soil. At all sites, more than 80% of the SOC and N stocks were protected in heavy fractions. Conclusions These results indicate that a decoupling depletion of SOC and soil N appeared with the Kobresia pasture degradation in the permafrost region of the Tibetan Plateau. The Kobresia pasture degradation affects the SOC and N fractions differently and thus regulates soil carbon and N cycling in the permafrost soils on the Tibetan Plateau. |
| Keyword | ORGANIC-MATTER FRACTIONS DIFFERENT VEGETATION TYPES GRASSLAND DEGRADATION LAND-USE DENSITY FRACTIONS PLANT DIVERSITY HEAVY-FRACTION STORAGE PLATEAU STOCKS |
| Subject Area | Environmental Sciences & Ecology ; Agriculture |
| DOI | 10.1007/s11368-020-02596-1 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000528598500002 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | https://ir.xtbg.ac.cn/handle/353005/11681 |
| Collection | 2012年后新成立研究组 |
| Affiliation | 1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China 2.Lanzhou Univ, Sch Life Sci, Inst Arid Agroecol, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Gansu, Peoples R China 3.Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Menglun 666303, Yunnan, Peoples R China |
| Recommended Citation GB/T 7714 | Yuan, Zi-Qiang,Wu, Qing-Bai,Song, Xin,et al. Pasture degradation impact on soil carbon and nitrogen fractions of alpine meadow in a Tibetan permafrost region[J]. JOURNAL OF SOILS AND SEDIMENTS,2020,20(5):2330-2342. |
| APA | Yuan, Zi-Qiang.,Wu, Qing-Bai.,Song, Xin.,Jiang, Xiao-Jin.,Gao, Si-Ru.,...&Li, Guo-Yu.(2020).Pasture degradation impact on soil carbon and nitrogen fractions of alpine meadow in a Tibetan permafrost region.JOURNAL OF SOILS AND SEDIMENTS,20(5),2330-2342. |
| MLA | Yuan, Zi-Qiang,et al."Pasture degradation impact on soil carbon and nitrogen fractions of alpine meadow in a Tibetan permafrost region".JOURNAL OF SOILS AND SEDIMENTS 20.5(2020):2330-2342. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| Pasture degradation （3021KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment