Monitoring and analysis of grassland desertification dynamics using Landsat images in Ningxia, China

文献类型： 外文期刊

第一作者： Li, Jinya

作者： Li, Jinya;Yang, Xiuchun;Jin, Yunxiang;Gao, Tian;Yu, Haida;Ma, Hailong;Qin, Zhihao;Xu, Bin;Yang, Zhi;Huang, Wenguang;Zhao, Lina

作者机构：

关键词： Grassland desertification;Grazing ban;Ningxia;Spatiotemporal analysis;Spectral mixture analysis

期刊名称：REMOTE SENSING OF ENVIRONMENT （ 影响因子：10.164； 五年影响因子：11.057 ）

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收录情况： SCI

摘要： State and local governments in China have implemented a series of grassland protection policies to address the problem of grassland degradation. In 2003, Ningxia was the first province to implement a province-wide grazing ban. The effect of this ban is contentious at all levels of government and has become a topic of public concern. Grassland desertification is the most direct indicator of the effect of the grazing ban. We selected 14 counties and cities in north-central Ningxia as the study area. A desertification classification and grading system for Ningxia's grassland was then designed based on fieldwork and expert review. Using the Spectral Mixture Analysis (SMA) and decision-tree methods, we interpreted Landsat TM/ETM+ images of the study area during four years: 1993, 2000, 2006 and 2011. The following results were obtained: from 1993 to 2011, the area of desertified grassland in north-central Ningxia decreased gradually from 8702km~2 in 1993 to 7485km~2 in 2011, a decrease of 13.98%; the degree of desertification gradually decreased from 3573km~2 of severely desertified grassland in 1993 to 1450km2 in 2011, a decrease of 59.41%; desertified grassland vegetation was restored rapidly during 2000-2006 and 2006-2011, reducing the total area of desertified grassland annually by 1.87 and 0.61%, respectively; finally, the area of severely desertified grassland decreased annually by 5.78 and 6.28% during 2000-2006 and 2006-2011, respectively. These results show that the region-wide grazing ban, together with other ecological engineering measures, has helped reverse desertification and promote the restoration of grassland vegetation.

分类号： X83`TP70`P3

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