基于Landsat数据的白龙江上游迭部林区植被覆盖度动态变化  

Analysis of Vegetation Coverage Change in Diebu Forest of the Upper Bailong River Base on Landsat Satellite Data

作　　者：孙守涛[1,2] 王立[1] 车克钧[1,2] 

机构地区：[1]甘肃农业大学林学院,兰州730070 [2]甘肃省白龙江林业管理局,兰州730050

出　　处：《四川农业大学学报》2016年第1期39-47,共9页Journal of Sichuan Agricultural University

基　　金：甘肃省科技厅科技创新服务平台建设计划(1306TTPK029)

摘　　要：【目的】基于1993、2003、2011和2015年的Landsat数据,提取并定量分析白龙江上游迭部林区的植被覆盖度及其不同年份间的动态。【方法】采用归一化植被指数(NDVI)和植被覆盖度遥感定量模型,运用像元二分法,计算得到4个年份的植被覆盖度等级和不同时段的植被覆盖度转移矩阵与变化强度。【结果】22a来林区低覆盖度植被共有56.94%转出,中低和中覆盖度植被主要向中高覆盖度转移,高覆盖度植被变化强度较弱,各等级正向转移面积共1 477.72km^2,中高和高覆盖度植被面积达到2 225.09km^2;不同时段植被覆盖度变化明显且具有各自特点。总的来说,在时间尺度上,区域植被覆盖度增长和衰退的变化强度均减小,维持稳定的能力逐步增强,呈现出增长区明显破碎化、不变区域稳中扩大、衰退区从干旱河谷逐渐向高寒山地转移的空间格局。【结论】由于大面积采伐的停止和各级政府生态保护措施的持续开展,1993-2015年研究区植被覆盖度渐次提升,先快后慢,平均覆盖度增长到67.48%,植被得到明显恢复。【Objective】Based on the Landsat satellite data in 1993,2003,2011 and 2015,annual change in vegetation coverage in Diebu forest area of the upper Bailong river were analyzed.【Method】The vegetation index（NDVI）and remote sensing quantitative model were used to estimate vegetation coverage.In addition,the pixels dichotomy was used to calculate vegetation coverage,decadal transfer matrix of vegetation coverage and intensity of annual variation.【Results】During the 22 years,low vegetation coverage（levelⅠ）had a total of 56.94% of transfermation.There were obvious transformations from medium to low coverage（levelⅡ）and from moderate coverage（levelⅢ）to high coverage（levelⅣ）.High vegetation coverage（levelⅤ）had a relatively small change.The total area of positive transformation for each level was 1 477.72km^2 andⅣ and Ⅴlevels totally had a net increase of 2 225.09km^2.The vegetation coverage changed significantly in different ways during different periods in this region.In general,on temporal scale,both increase and decrease intensity showed a reduction and the ability to maintain stability gradually increased.Growth areas increased from continuous to scattered and regional of intergenera-tional expanded annually.The degraded area transformed from the dry valleys to alpine mountains gradually.【Conclusion】As a result of prohibition of harvest and ecological protection measures of the governments,vegetation coverage increased gradually to 67.48%from 1993 to 2015in this region and the vegetation was recovered obviously.

关 键 词：白龙江上游 迭部林区 NDVI 植被覆盖度 转移矩阵 

分 类 号：Q948[生物学—植物学] TP79[自动化与计算机技术—检测技术与自动化装置]