Effects of permafrost degradation on alpine grassland in a semi-arid basin on the Qinghai-Tibetan Plateau
文献类型：期刊论文
| 作者 | Yi, Shuhua; Zhou, Zhaoye; Ren, Shilong; Xu, Ming; Qin, Yu; Chen, Shengyun; Ye, Baisheng |
| 刊名 | ENVIRONMENTAL RESEARCH LETTERS
 |
| 出版日期 | 2011-10-01 |
| 卷号 | 6期号:4页码:7 |
| 关键词 | fractional vegetation cover land surface temperature permafrost degradation alpine grassland Qinghai-Tibetan Plateau |
| ISSN号 | 1748-9326 |
| DOI | 10.1088/1748-9326/6/4/045403 |
| 通讯作者 | Yi, Shuhua(yis@lzb.ac.cn) |
| 英文摘要 | Permafrost on the Qinghai-Tibetan Plateau (QTP) has degraded over the last few decades. Its ecological effects have attracted great concern. Previous studies focused mostly at plot scale, and hypothesized that degradation of permafrost would cause lowering of the water table and drying of shallow soil and then degradation of alpine grassland. However, none has been done to test the hypothesis at basin scale. In this study, for the first time, we investigated the relationships between land surface temperature (LST) and fractional vegetation cover (FVC) in different types of permafrost zone to infer the limiting condition (water or energy) of grassland growth on the source region of Shule River Basin, which is located in the north-eastern edge of the QTP. LST was obtained from MODIS Aqua products at 1 km resolution, while FVC was upscaled from quadrat (50 cm) to the same resolution as LST, using 30 m resolution NDVI data of the Chinese HJ satellite. FVC at quadrat scale was estimated by analyzing pictures taken with a multi-spectral camera. Results showed that (1) retrieval of FVC at quadrat scale using a multi-spectral camera was both more accurate and more efficient than conventional methods and (2) the limiting factor of vegetation growth transitioned from energy in the extreme stable permafrost zone to water in the seasonal frost zone. Our study suggested that alpine grassland would respond differently to permafrost degradation in different types of permafrost zone. Future studies should consider overall effects of permafrost degradation, and avoid the shortcomings of existing studies, which focus too much on the adverse effects. |
| 收录类别 | SCI |
| WOS关键词 | VEGETATION FRACTIONAL COVERAGE ; LANDSAT TM ; CHINA ; REFLECTANCE ; QUANTIFICATION ; IMAGERY |
| WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
| WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000298674700055 |
| 出版者 | IOP PUBLISHING LTD |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2556556 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Yi, Shuhua |
| 作者单位 | Chinese Acad Sci, State Key Lab Cryosphere Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yi, Shuhua,Zhou, Zhaoye,Ren, Shilong,et al. Effects of permafrost degradation on alpine grassland in a semi-arid basin on the Qinghai-Tibetan Plateau[J]. ENVIRONMENTAL RESEARCH LETTERS,2011,6(4):7. |
| APA | Yi, Shuhua.,Zhou, Zhaoye.,Ren, Shilong.,Xu, Ming.,Qin, Yu.,...&Ye, Baisheng.(2011).Effects of permafrost degradation on alpine grassland in a semi-arid basin on the Qinghai-Tibetan Plateau.ENVIRONMENTAL RESEARCH LETTERS,6(4),7. |
| MLA | Yi, Shuhua,et al."Effects of permafrost degradation on alpine grassland in a semi-arid basin on the Qinghai-Tibetan Plateau".ENVIRONMENTAL RESEARCH LETTERS 6.4(2011):7. |
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来源：寒区旱区环境与工程研究所
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