2000-2014年疏勒河流域植被覆盖时空变化

doi:10.11934/j.issn.1673-4831.2016.05.011

摘要/Abstract

摘要：

基于MODIS NDVI数据，借助ArcGIS和Matlab软件，采用线性趋势分析、M-K检验法和Hurst指数等方法，对2000-2014年疏勒河流域植被覆盖时空变化进行研究。结果表明，近15 a来，疏勒河中下游平均植被覆盖呈快速、平稳增加趋势，上游呈波动性轻微上升态势；整个流域植被覆盖明显改善，显著和极显著改善区占30.86%，集中于坡度小于20°的上游山区以及中下游灌区周边，显著和极显著退化区不足1%，集中在中下游的自然植被区；整个流域在2004年后进入相对暖湿期，6-8月降水量和均温对上游植被生长影响最大，呈显著正相关关系，且降水的影响大于均温，中下游植被受气候要素的影响明显小于上游；流域未来植被改善区占18.63%，主要为持续改善区，集中在移民安置点周边、疏勒河中下游自然保护区以及祁连-阿尔金山北部山麓西段；退化区占14.25%，主要是由现在的改善区转化而来，集中于党河南山、野马山、照壁山等坡度小于20°的上游山区。

关键词: 植被覆盖, 归一化植被指数, 线性趋势分析, M-K检验, Hurst指数, 疏勒河流域

Abstract:

Based on relevant MODIS NDVI data, spatio-temporal variation of the vegetation cover in the Shule River Valley during 2000-2014 was analyzed using the linear trend analysis, M-K test and Hurst index methods, with the aid of ArcGIS and Matlab software. Results show that in the past 15 years, vegetation cover has been increasing rapidly and steadily in the middle and lower reaches of the Shule River Valley, while fluctuating with a mild rising trend in the upper reaches. However, as a whole, it has been improving remarkably in the river valley. The areas with vegetation cover significantly or extra-significantly improved now account for 30.86% of the valley, and are mainly distributed in the irrigated agricultural regions in the middle and lower reaches and mountainous areas with slope less than 20 degree in the upper reaches; while the areas with vegetation cover significantly or extra-significantly degraded do less than 1%, and are concentrated in the regions with natural vegetation cover in the middle and lower reaches of the valley. Since 2004, the valley has been under a relatively warm and humid climate. The total precipitation and mean temperature of the period from June to August affects growth of the vegetation the most significantly in the upper reaches of the valley, showing a significant positive relationship, and that the effect of precipitation is much higher than that of temperature. The vegetation in the middle and lower reaches is not so sensitive to meteorological factors as that in the upper reaches. The areas with vegetation to be improved in future, mostly to be continuously improved, account for 18.63%, and are mainly distributed around the new settlements and in nature reserves in the middle and lower reaches of the Shule River Valley and the west section of the northern piedmont of the Qilian-Altun Mountains, whereas the areas with vegetation degraded amount to 14.25%, and are mostly transformed from areas with vegetation improved and mainly distributed on slopes less than 20 degree in the mountainous areas of Danghenan Mountain, Yema Mountains and Zhaobi Mountain, in the upper reaches of the valley.

Key words: vegetation cover, NDVI, linear trend analysis, M-K test, Hurst index, Shule River Valley

中图分类号:

齐敬辉, 牛叔文, 马利邦, 何红. 2000-2014年疏勒河流域植被覆盖时空变化[J]. 生态与农村环境学报, 2016, 32(5): 757-766.

QI Jing-hui, NIU Shu-wen, MA Li-bang, HE Hong. Spatio-Temporal Variation of Vegetation Cover in Shule River Valley During 2000-2014[J]. Journal of Ecology and Rural Environment, 2016, 32(5): 757-766.

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