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| 西藏班戈县草地退化动态变化及其驱动力分析 | |
| 引用本文： | 徐瑶,何政伟,陈涛.西藏班戈县草地退化动态变化及其驱动力分析[J].草地学报,2011,19(3):377-380. |
| 作者姓名： | 徐瑶 何政伟 陈涛 |
| 作者单位： | 1. 成都理工大学地球科学学院, 成都, 610059; 2. 西华师范大学国土资源学院, 南充, 四川, 637002 |
| 基金项目： | 西藏重大农业生态环境问题防护技术研究 |
| 摘 要： | 为了监测班戈县近20年(1990-2009年)草地退化状况,利用3个时相的TM和ETM数据,以及CEBERS数据,分别提取了班戈县的植被指数,并通过植被指数转化模型计算出植被覆盖度。按植被覆盖度将草地划分为4个不同退化等级,比较了班戈县近20年草地退化情况,分析了草地退化的原因。结果表明:草地退化面积前10年(1990-1999年)呈增加趋势,后10年(2000-2009年)呈减少趋势,从总体变化趋势看,草地退化面积在不断增加。造成草地退化的原因包括自然原因如气候高寒、干旱,土壤贫瘠、鼠虫害,以及人为因素如超载、不合理的开采活动以及滥挖药材等。 |
| 关 键 词： | 植被指数 草地退化 驱动力 西藏 班戈县 |
| 收稿时间： | 2010-12-30 |
Dynamics and Its Driving Factor of Grassland Degradation in Bange County |
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| XU Yao,HE Zheng-wei,CHEN Tao.Dynamics and Its Driving Factor of Grassland Degradation in Bange County[J].Acta Agrestia Sinica,2011,19(3):377-380. | |
| Authors: | XU Yao HE Zheng-wei CHEN Tao |
| Institution: | 1. College of Earth Sciences, Chengdu University of Technolog, Chengdu 610059, China; 2. Land and Resources College, China West Normal University, Nanchong, Sichuan Province, 637002, China |
| Abstract: | Vegetation coverage level was calculated using vegetation index according to vegetation index transformation model.Deteriorated grasslands of Bange County were investigated using three-phase TM,TM data and CEBERS data.The deteriorated grasslands were classified as four different levels according to vegetation coverage degree.The dynamics and driving factors of grassland deterioration in recent 20 years were analyzed in Bange County.Results showed that Results showed that grasslands in Bange County were increasingly deteriorating in the last 20 years.Grassland deterioration was caused by both natural and human elements.Natural elements included frigid climate,poor soil and disaster of rats and pests,while human elements included overgrazing,irregular mining activities and excessive picking medicinal materials. |
| Keywords: | Vegetation index Grassland degradation Driving factor Tibet Bange County |
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