| 关中-天水经济区土地利用变化对净第一性生产力影响测评 |
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| 引用本文： | 周自翔,李晶,韩艳飞.关中-天水经济区土地利用变化对净第一性生产力影响测评[J].干旱区地理,2013,36(6):1058-1066. |
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| 作者姓名： | 周自翔 李晶 韩艳飞 |
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| 作者单位： | （ 陕西师范大学旅游与环境学院， 陕西 西安 710062 ） |
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| 基金项目： | 国家自然科学基金项目（41001388，41371020）；陕西省科技计划项目（2012JM5011） |
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| 摘 要： | 净第一性生产力是表现陆地生态过程的关键参数，土地利用变化深刻影响区域的净第一性生产力。选取关中-天水经济区为研究区域，尝试对30 m精度的1980-2011年4期9月份左右Landsat 7的遥感影像以及CASA模型来估算关中-天水经济区的净第一性生产力，并用2011年遥感图像解译获得该年的土地利用数据，以及土地利用变化情况。在此基础上分析土地利用变化对净第一性生产力的影响，并且对关天经济区各县市净初级生产力进行了对比和分析。结果表明：1980-2011年，关中-天水经济区土地利用耕地、林地、居民建筑用地变化明显，南部秦岭山区多为林地与草地，净第一性生产力高达625.37 g C·m-2·a-1，而关中平原与天水地区人口居住区与开垦区净第一性生产力明显下降，最低达47.78 g C·m-2·a-1，人为的开发与利用土地降低了区域的净第一性生产力。所以，要继续施行落实退耕还林政策，控制城镇用地较大速度的扩增，以保持好区域的生态服务功能。
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| 关 键 词： | 关天经济区 土地利用变化 CASA 净初级生产力 |
| 收稿时间： | 2013-01-08 |
Evaluation and effect of LUCC on [NPP] in Guanzhong-Tianshui Economic Zone |
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| ZHOU Zi-xiang,LI Jing,HAN Yan-fei.Evaluation and effect of LUCC on [NPP] in Guanzhong-Tianshui Economic Zone[J].Arid Land Geography,2013,36(6):1058-1066. |
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| Authors: | ZHOU Zi-xiang LI Jing HAN Yan-fei |
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| Institution: | （College of Tourism and Environment Sciences, Shaanxi Normal University, Xi'an Shaanxi 710062, Shaanxi, China） |
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| Abstract: | Net primary productivity is the key parameter of terrestrial ecological processes，and an important indicator of estimating the Earth's support and sustainable development evaluation of land ecological system. Net primary productivity is influenced by LUCC. Changing land uses and cover types influences the vegetation composition and health，so it is an important tool for monitoring ecosystem responses to environmental change with understanding the effects of these changes on net primary production （NPP）. Guanzhong-Tianshui economic region is one of key construction of economic zone which is proposed in the "Eleven-Five" Plan of development of the western part of the country. Using remote-sensing images and precipitation，temperature，and total solar radiation data from 1980，2000，2005 and 2011，and a light utilization efficiency model，we studied the effects of changes in these parameters and land use and cover types on NPP in China’Guanzhong-Tianshui region. We determined the NDVI of vegetation in the basin，and used these results to estimate the NPP of vegetation in the basin and the influence of land use and cover type changes on NPP under two climate scenarios. Using CASA model to estimate the NPP and get LUCC in Guanzhong-Tianshui Economic region for four years. Based on the analysis，get the effect of land use change which impact on net primary productivity. At last，give a solution for Guanzhong-Tianshui Economic region make the area developing sustainable. Results indicate as follows：（1） the net primary productivity is 2.3×107 gC·m-2·a-1 in 1980，1.7×107 gC·m-2·a-1 in 2000；2.4×107 gC·m-2·a-1 in 2005；2.1×107 gC·m-2·a-1 in 2011. returning farmland to regional net primary productivity growth has significant effects，form 2000 to 2005 years，the net primary productivity of forest increased 3.15×107 gC·m-2·a-1，accounting for 41.2%.（2） It is obvious that the relationship with spatial distribution of the net primary productivity and land use types，economic development level and terrain. High net primary productivity distributed in Qinling Mountains and Baoji and Tianshui junction of the mountainous area，and low value area distributed in Guanzhong Plain of the economic developed area，Xi’an is representative area.（3） In all types of land use，the woodland of net primary productivity mean maximum，the second is the grass，and cultivated land. The change of land use type of regional net primary productivity is obvious. Cultivated land changed into land for urban and rural residents mining make net primary productivity reduced，and cultivated land changed into the grass make net primary productivity increase，and cultivated land changed into forest land need longer fixed number of year to show its real net primary productivity effect. |
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| Keywords: | Guanzhong-Tianshui Economic region LUCC CASA NPP |
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