水土保持通报2016，Vol.36Issue(6)：308-314,7.DOI:10.13961/j.cnki.stbctb.2016.06.052
半湿润半干旱过渡区洮河流域植被盖度变化特征
Vegetation Coverage Variation Features River in Semi-humid and Semi-dry Transitional Region of Taohe River Basin
摘要
Abstract
[Objective] The objective of this paper was to analyze the variation of vegetation coveragein in semi-humid and semi-dry transitional region of Taohe River basin through high resolution RS image in order to provide a reference for the implementation of new way of returning farmland to forest and grassland,and for decision making of the basin's ecological civilization construction and sustainable development.[Methods] Landsat 5TM in 1993,Landsat 7ETM+ in 2000,Landsat 8OLI in 2015 and ASTER GDEM data sets were used in this paper.Firstly,Dimidiate Pixel Model was used to invert vegetation coverage.Then base units extracted from the basin partition,elevation,slope and aspect were used to count and analyze the mean and variation area ratio of vegetation coverage.[Results] On a whole level,vegetation coverage mean increased by 17.52％ in Taohe River basin from 1993 to 2015.Increased area covered 62.24％ and the decreased covered 6.41％.The date sets showed that the lowest vegetation coverage was below the altitude of 2 000 m.The sum area ratio of decrease and no significant change run up to the maximum as the altitude is above 4 000 m.Vegetation coverage reached the lowest but increased fast in the slopes between 0°～5° and 10°～15°.The sum area ratio of decrease and no significant change grew with the increase of slope,and reached its highest as it was above 60° (covered 67.48％).Effect of slope exposure to the the distribution of the vegetation coverage was weaken.[Conclusion] The results showed that the basin's general trend of vegetation coverage was increasing,but there were still decrease in some areas and had significant variation features.In the future we should pay great attention to vegetation restoration in the areas as the elevation is below 2 500 m,slope grade is below 20° and the slope aspect is western,southern or at level ground.Existing vegetation should be well protected in the elevation above 4 000 m,and when slope is above 45° and slope aspect is eastern and northeast.关键词
植被盖度变化/高程/坡度/坡向/半干旱半湿润过渡区/洮河流域Key words
vegetation coverage/elevation/slope/aspect/semi-humid and semi-dry transitional region/Taohe basin分类
农业科技引用本文复制引用
许幼霞,周旭,赵娟,周秋文,韦小茶..半湿润半干旱过渡区洮河流域植被盖度变化特征[J].水土保持通报,2016,36(6):308-314,7.基金项目
国家“十二五”科技支撑计划项目“黄河中游河川径流锐减驱动力及人为调控效应研究”(2012BAB02B00) （2012BAB02B00）
黄河水利委员会科技项目 （）
贵州省教育厅教改项目 （）
