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| 朱溪流域植被覆盖的时空变化及地形分异特征 |
| Analysis of Spatio-temporal Variation of Vegetation Coverage and Characteristics of Topographic Differentiation in Watershed of Zhuxi River,China |
| 投稿时间：2015-05-14 修订日期：2015-08-20 |
| DOI：10.14050/j.cnki.1672-9250.2016.02.002 |
| 中文关键词: 植被覆盖;时空变化;重心迁移;地形响应指数;地形分异 |
| 英文关键词: vegetation coverage;patio-temporal variation;mean-center migration;topography response index;topographical variation |
| 基金项目:国家自然科学基金项目(41371512);福建省自然科学基金项目(2013J01156) |
| 作者 | 单位 | E-mail | | 徐芮1, 陈志强2,3, 陈志彪2,3 | 1. 福建师范大学 地理科学学院, 福州 350007
2. 湿润亚热带山地生态国家重点实验室培育基地, 福州 350007
3. 福建师范大学 地理研究所, 福州 350007 | soilqiang061@163.com |
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| 中文摘要: |
| 分析2003~2011年朱溪流域植被覆盖的时空分布状况及其变化的地形响应特征,为该地区进一步治理水土流失和生态恢复工程提供决策支持。基于RS和GIS技术,采用像元二分法模型计算植被覆盖度,通过植被重心模型、地形响应指数表征其植被覆盖的时空变化规律。(1)朱溪流域植被覆盖度整体呈上升趋势,Ⅳ、Ⅴ类的植被覆盖面积比率已达到区域的62.28%;格局动态上,Ⅰ、Ⅱ类重心向东北方向移动,Ⅲ、Ⅳ、Ⅴ类重心向西南方向移动,表现为流域植被中、西部改善,东部零散退化的空间格局;(2)在海拔0~300 m、坡度小于5°和大于35°区域各等级植被覆盖面积变化最显著,治理措施有效到位,而海拔450~500 m处I类植被覆盖面积增加,应引起相关注意。8年间该流域植被覆盖有明显改善,各等级植被覆盖变化在不同地形条件下差异明显。 |
| 英文摘要: |
| To analyze the spatio-temporal variation of vegetation coverage and its change responding to the terrain factors from 2003 to 2011 in watershed of Zhuxi River, China and to provide reference for the region to further control of soil erosion and ecological restoration engineering. Based on the RS and GIS technology, the dimidiate pixel model was applied to calculate the regional vegetation fraction distribution, by using the center of gravity model and the topography response index to characterize the spatio-temporal variation of vegetation coverage. Results show that (1)the vegetation coverage in watershed of Zhuxi River was holistically in a rising trend, and the area proportion of Ⅳ and Ⅴ types were up to 62.28%. On the spatial dynamics, the center of Ⅰ and Ⅱ type were shifting northeast, and that of Ⅲ,Ⅳ and Ⅴ types was shifting southwest, presenting an increasing pattern in the middle and the west, and a decreasing pattern in the east; (2)at the altitude of 0-300 m and in micro slop (<5°) and steep slop (>35°),all types of vegetation coverage have a significant area change. Management measures are effective and performed. The area of Ⅰ coverage type between at altitude of 450-500 m is increasing which should be paid attention to by correlated departments. During the past eight years, the basin's vegetation coverage has been greatly improvedwith obvious difference of each vegetation coverage type under different terrain conditions. |
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