提孜那甫河流域冰-草生态交错带MODZS动态特征

摘要

The Ice-grass ecotone is an important part of Ecotone.Analyzing the environmental features of the Icegrass ecotone has great significance for protecting the fragile ecological environment under the background of global warming.Take the Tizinafu River Basin mountainous unique Ice-grass ecotone as the research subject,based on MODIS products,using remote sensing techniques for qualitative and quantitative analysis of its environmental characteristics.The results showed that:In the Ice-grass Ecotone year-round low temperature,the annual average temperature was-4.79℃,from May to September temperatures above 0℃,which was the main snowmelt period,the total amount of snowmelt was 5.4 × 108 m3,which accounted for 70.03％ of Tizinafu River water runoff.The water is an important water supply of Yerqiang Oasis,in September of that year to the following May with temperatures below 0℃,this period was mainly of snow;In the development of the primary stage of cold-frozen soil and colddesert soil is widely distributed within the Ice-grass ecotone,freeze-thaw desertification widespread and serious,vegetation is extremely sparse;The Ice-grass Ecotone included stream rock slope,pour rubble,sparsely-vegetated of the high mountain,three extremely arid landlocked plateau desert landscape types.%冰-草生态交错带是陆地生态交错带的重要组成部分,在全球气候变暖背景下,研究其环境特征对于保护该带脆弱的生态环境具有重要意义.以提孜那甫河流域山区特有的冰-草生态交错带为研究对象,利用MODIS产品,基于遥感技术对其环境特征进行定性、定量分析.结果表明:交错带常年低温,年平均温度为-4.79C,5-9月气温＞0℃,是主要的融雪期,融雪水量为5.4×108 m3,占提孜那甫河总径流量的70.03％,是叶尔羌绿洲重要的水源补给来源,当年9月到次年5月气温均在0℃以下为主要的积雪期;处在发育初级阶段的寒冻土和寒漠土广泛分布于交错带内,冻融荒漠化普遍且严重,植被分布极为稀疏;交错带主要包含高山流石坡、高山倒石堆、高山稀疏垫状植被等三种极干旱的内陆高原荒漠景观类型.