| 气候变化和人类活动在榆林市荒漠化过程中的相对作用 |
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| 引用本文： | 孙建国,王涛,颜长珍.气候变化和人类活动在榆林市荒漠化过程中的相对作用[J].中国沙漠,2012,32(3):625-630. |
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| 作者姓名： | 孙建国 王涛 颜长珍 |
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| 作者单位： | 1. 兰州交通大学数理与软件工程学院,甘肃兰州730070 中国科学院寒区旱区环境与工程研究所,甘肃兰州730000
2. 中国科学院寒区旱区环境与工程研究所,甘肃兰州,730000 |
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| 基金项目： | 数字制图与国土信息应用工程国家测绘局重点实验室开放研究基金项目，国家重点基础研究发展计划“973”项目，中国博士后科学基金项目 |
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| 摘 要： | 针对已有研究的不足,提出一个集成时序和空间两方面特征的植被-气候时空关系统计模型,并用来在栅格尺度上定量区分陕西省榆林市荒漠化动态中气候变化和人类活动的相对作用。结果显示,1986—2000年,榆林市荒漠化发展主要发生在南部丘陵沟壑区,逆转主要发生在北部风沙草滩区,这一空间格局特别明显且在研究期内没有发生根本改变。从第1时段(1986—1990年)至第2时段(1991—1995年),荒漠化整体上处于发展状态,且无论是荒漠化发展区还是逆转区,人类活动的作用均占据绝对主导地位,分别为98.7%和101.4%,气候变化的作用甚微；从第2时段(1991—1995年)至第3时段(1996—2000年),荒漠化过程整体上达到稳定态势,在荒漠化发展区,气候变化和人类活动的作用基本相当,分别为46.2%和53.8%,而在荒漠化逆转区,人类活动的作用达到了119.0%,气候变化的作用则为-19.0%。另外,气候变化和人类活动的相对作用有很大的空间异质性。
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| 关 键 词： | 荒漠化 植被-气候时空关系 气候变化 人类活动 相对作用 榆林市 |
| 收稿时间： | 2011-09-01; |
The Relative Roles of Climate Change and Human Activities in Desertification Process： A case study in Yulin, Shaanxi Province, China |
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| SUN Jian-guo,WANG Tao,YAN Chang-zhen.The Relative Roles of Climate Change and Human Activities in Desertification Process： A case study in Yulin, Shaanxi Province, China[J].Journal of Desert Research,2012,32(3):625-630. |
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| Authors: | SUN Jian-guo WANG Tao YAN Chang-zhen |
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| Institution: | 1.School of Mathematics,Physics and Software Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;2.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China) |
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| Abstract: | To overcome shortcoming of current research on relative roles of climate change and human activities in desertification process,we put forward a vegetation-climate spatio-temporal relationship statistical model.Based on this model,we quantitatively discriminated the relative roles of climate change and human activities in the desertification process in Yulin,Shaanxi Province from 1986 to 2000 on grid scale.Results showed that desertification development occurred mainly in the southern hilly and gully area of Yulin whereas desertification reversion took place in the northern sand and marsh area.The spatial pattern was especially evident and had no significant change in the study period.From the first time section(1986-1990) to the second(1991-1995),the desertification process was developing as a whole,and human activities’ roles were always overwhelmingly dominant in the desertification development district and the desertification reversion district(they were 98.7% and 101.4% respectively),but the role of climate change was extremely slight.From the second time section(1991-1995) to the third time section(1996-2000),the desertification process reached a stable state,and the role of climate change was nearly equivalent to that of human activities in the desertification development district(they were 46.2% and 53.8% separately),yet the role of human activities came up to 119.0% in the desertification reversion district,while the role of climate change amounted to-19.0%.In addition,the relative roles of climate change and human activities possessed great spatial heterogeneity.The conclusion rather coincides with the qualitative analysis in many literatures,it indicates that this method has certain rationality and can be utilized as a reference for desertification monitoring and research in other areas. |
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| Keywords: | desertification vegetation-climate spatio-temporal relationship climate change human activi-ties relative role Yulin |
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