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Journal of Geographical Sciences  2013, Vol. 23 Issue (1): 98-112    DOI: 10.1007/s11442-013-0996-8
  Research Articles 本期目录 | 过刊浏览 | 高级检索 |
Response of vegetation restoration to climate change and human activities in Shaanxi-Gansu- Ningxia Region
LI Shuangshuang, YAN Junping, LIU Xinyan, WAN Jia
College of Tourism and Environment Science, Shaanxi Normal University, Xi’an 710062, China
Response of vegetation restoration to climate change and human activities in Shaanxi-Gansu- Ningxia Region
LI Shuangshuang, YAN Junping, LIU Xinyan, WAN Jia
College of Tourism and Environment Science, Shaanxi Normal University, Xi’an 710062, China
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摘要 

The “Grain for Green Project” initiated by the governments since 1999 were the dominant contributors to the vegetation restoration in the agro-pastoral transitional zone of northern China. Climate change and human activities are responsible for the improvement and degradation to a certain degree. In order to monitor the vegetation variations and clarify the causes of rehabilitation in the Shaanxi-Gansu-Ningxia Region, this paper, based on the MODIS-NDVI and climate data during the period of 2000-2009, analyzes the main characteristics, spatial-temporal distribution and reasons of vegetation restoration, using methods of linear regression, the Hurst Exponent, standard deviation and other methods. Results are shown as follows. (1) From 2000 to 2009, the NDVI of the study area was improved progressively, with a linear tendency being 0.032/10a, faster than the growth of the Three-North Shelter Forest Program (0.007/10a) from 1982 to 2006. (2) The vegetation restoration is characterized by two fast-growing periods, with an “S-shaped” increasing curve. (3) The largest proportion of the contribution to vegetation restoration was observed in the slightly improved area, followed by the moderate and the significantly improved area; the degraded area is distributed sporadically over southern part of Ningxia Hui Autonomous Region as well as eastern Dingbian of Shaanxi province, Huanxian and Zhengyuan of Gansu province. (4) Climate change and human activities are two driving forces in vegetation restoration; moreover anthropogenic factors such as “Grain for Green Project” were the main causes leading to an increasing trend of NDVI on local scale. However, its influencing mechanism remains to be further investigated. (5) The Hurst Exponent of NDVI time series shows that the vegetation restoration was sustainable. It is expected that improvement in vegetation cover will expand to the most parts of the region.

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关键词 the vegetation cover“Grain for Green Project”spatial-temporal vegetation patternsclimate changeShaanxi-Gansu-Ningxia Region    
Abstract

The “Grain for Green Project” initiated by the governments since 1999 were the dominant contributors to the vegetation restoration in the agro-pastoral transitional zone of northern China. Climate change and human activities are responsible for the improvement and degradation to a certain degree. In order to monitor the vegetation variations and clarify the causes of rehabilitation in the Shaanxi-Gansu-Ningxia Region, this paper, based on the MODIS-NDVI and climate data during the period of 2000-2009, analyzes the main characteristics, spatial-temporal distribution and reasons of vegetation restoration, using methods of linear regression, the Hurst Exponent, standard deviation and other methods. Results are shown as follows. (1) From 2000 to 2009, the NDVI of the study area was improved progressively, with a linear tendency being 0.032/10a, faster than the growth of the Three-North Shelter Forest Program (0.007/10a) from 1982 to 2006. (2) The vegetation restoration is characterized by two fast-growing periods, with an “S-shaped” increasing curve. (3) The largest proportion of the contribution to vegetation restoration was observed in the slightly improved area, followed by the moderate and the significantly improved area; the degraded area is distributed sporadically over southern part of Ningxia Hui Autonomous Region as well as eastern Dingbian of Shaanxi province, Huanxian and Zhengyuan of Gansu province. (4) Climate change and human activities are two driving forces in vegetation restoration; moreover anthropogenic factors such as “Grain for Green Project” were the main causes leading to an increasing trend of NDVI on local scale. However, its influencing mechanism remains to be further investigated. (5) The Hurst Exponent of NDVI time series shows that the vegetation restoration was sustainable. It is expected that improvement in vegetation cover will expand to the most parts of the region.

Key wordsthe vegetation cover    “Grain for Green Project”    spatial-temporal vegetation patterns    climate change    Shaanxi-Gansu-Ningxia Region
收稿日期: 2012-06-09     
基金资助:

National Natural Science Foundation of China, No.41171090; No.40871052

通讯作者: Yan Junping, Professor, E-mail: yanjp@snnu.edu.cn     E-mail: yanjp@snnu.edu.cn
作者简介: Li Shuangshuang (1988-), Master, specialized in global change and disaster prevention. E-mail: 40609010@stu.snnu.edu.cn
引用本文:   
LI Shuangshuang, YAN Junping, LIU Xinyan, WAN Jia. Response of vegetation restoration to climate change and human activities in Shaanxi-Gansu- Ningxia Region[J]. Journal of Geographical Sciences, 2013, 23(1): 98-112.
LI Shuangshuang, YAN Junping, LIU Xinyan, WAN Jia. Response of vegetation restoration to climate change and human activities in Shaanxi-Gansu- Ningxia Region. Journal of Geographical Sciences, 2013, 23(1): 98-112.
链接本文:  
http://www.geogsci.com/CN/10.1007/s11442-013-0996-8      或      http://www.geogsci.com/CN/Y2013/V23/I1/98

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