基于多尺度遥感数据的塔里木河干流地区植被覆盖动态

doi:10.7522/j.issn.1000-694X.2015.00147

摘要/Abstract

摘要： 利用地面观测数据，Landsat TM和MODIS数据，基于尺度上推的研究思路，采用修正的三波段最大梯度差模型反演植被覆盖度，分析了塔里木河干流地区2000-2013年植被覆盖度时空分布及其动态变化特征。结果表明：（1）地面观测数据、Landsat TM与MODIS数据相结合进行尺度上推，尺度转换相对误差控制在4%以内，可以实现分析大范围长时间序列植被变化；（2）塔里木河干流区域植被覆盖度年内最大值出现在7、8月，2000-2013年平均植被覆盖度变化整体上呈现增长的趋势，上游年均植被覆盖度18.67%~23.67%，中游10.6%~12.44%，下游4.7%~6%，但呈现两段式发展（2000-2006年显著提高，2006-2013年小伏波动变化）；（3）塔里木河干流区域植被覆盖度空间差异明显，上游植被覆盖度增长速率最高，中游次之，下游增长速率最小。上游植被覆盖度年增长速率为0.37%，且增长趋势显著；中游年增长速率为0.06%，没有显著的变化趋势；下游年增长速率为0.05%，增长变化显著区域位于河道或稍远离河道附近及台特玛湖附近。

关键词: 修正的三波段最大梯度差模型, 尺度上推, 植被覆盖度, 时空变化特征, 塔里木河

Abstract: This paper, by using ground observation data with Landsat TM data and MODIS data, based on upscaling method,employing the modified three-band maximal gradient difference model which reverses vegetation fractional cover, analyzed the spatial-tempo change characters as well as dynamic changes of vegetation fractional cover on the mainstream of the Tarim River during 2000-2013. The result indicated that:(1) The method of upscaling combined with ground observation data, Landsat TM and MODIS data could realize the analysis of vegetation changes of a wide range during long time series, scale conversion error controlled within 4%; (2) The maximum value of vegetation fractional cover appeared in July and August within a year on the mainstream of the river, the annual average vegetation fractional cover changes overall showed a positive trends where the range of vegetation fractional cover between 18.67%-23.67% on the upper reaches, 10.6%-12.44% on the middle reaches, 4.7%-6% on the lower reaches. There was a remarkable increase during 2000-2006 and a small fluctuation during 2006-2013; (3) The fractional vegetation cover on the mainstream had a significant spatial variation. The upper reaches had a highest growth rate, followed by the middle reaches, the lower reaches had a minimum growth rate. The growth rate of upper reaches was 0.37%, the growth rate of the middle reaches was 0.06%, but there is no significant change trend in it, the growth rate of lower reaches wass 0.05%.

Key words: modified three-band maximal gradient difference model, upscaling, vegetation fractional cover, spatial-tempo change characters, Tarim River

中图分类号:

P901

郭辉, 黄粤, 李向义, 包安明, 宋洋, 孟凡浩. 基于多尺度遥感数据的塔里木河干流地区植被覆盖动态[J]. 中国沙漠, 2016, 36(5): 1472-1480.

Guo Hui, Huang Yue, Li Xiangyi, Bao Anming, Song Yang, Meng Fanhao. Dynamic Changes of Fractional Vegetation Cover along the Mainstream of the Tarim River[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(5): 1472-1480.

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