岷江上游干旱河谷区域空间变化的定量判定  

Long-term dynamics of dry valleys in the upper reaches of Mingjiang River,China

作　　者：杨兆平[1] 常禹[1] 布仁仓[1] 刘淼[1] 张文广[1] 

机构地区：[1]中国科学院沈阳应用生态研究所

出　　处：《生态学报》2007年第8期3250-3256,共7页Acta Ecologica Sinica

基　　金：国家重点基础研究发展规划资助项目(2002CB111506)~~

摘　　要：采用遥感和地理信息系统技术,准确界定了岷江上游干旱河谷的范围,在此基础上分析了岷江上游干旱河谷的面积变化及其边界分布海拔的最高上限在垂直方向上的抬升距离。结果表明,干旱河谷面积在不断扩大,由1974年的93140hm2扩大到2000的123078hm2,其中1995～2000年间年变化率较1974～1995年有所降低;岷江上游干旱河谷的边界沿山体向上攀升非常迅速,1974岷江上游干旱河谷边界的最高上限海拔为3128m,1995年为3167m,较1974年抬升了39m;2000年为3181m,与1995年相比沿垂直方向向上抬升了14m。1974到2000年间岷江上游干旱河谷边界最高上限沿垂直方向抬升了53m,大约平均每年抬升2m。为了遏制干旱河谷进一步扩大的趋势,必须加大植被恢复和生态建设力度。The dry valleys in Hengduan Mountains of Southwesten China are located in unique geographical regions where ecological security and environment conservation are crucial for local sustainable development. Depending on the microclimatic （ thermal ） conditions, vegetation characteristics and soils, dry valleys in the region can be divided into three major types： the dry-hot valley, the dry-warm valley and the dry-cool valley. The dry valleys in the upper reaches of Minjiang River are the dry-cool valley with increasing population and rapid economy growth, serious soil erosion, droughts, deterioration, and desertification have greatly shaped the ecosystem structure, function, and service of the dry valleys across the region. In this study, we quantified the distribution of the Dry Valleys in the Upper Reaches of Mingjiang River, using geographic information system （ GIS ） and various remote sensing products. A special attention was paid to the changes of the total area of dry valleys and the upper boundaries of the valleys. We found that the total area of dry valleys increased from 93140 hm^2 in 1974 to 123078 hm^2 in 2000; and the change rate from 1995 to 2000 was lower than that from 1974 to 1995. The upper boundaries of the valleys also ascended rapidly with the upper limit of 3128 m in 1974, 3167 m in 1995 （ i.e. 39 m increase ）, and 3181 m in 2000-an average of 2 m per year over the 26-year study period. We conclude that vegetation recovery and ecological constructions are urgently needed to slow the expansions of these dry valleys.

关 键 词：岷江 干旱河谷 景观动态 空间变化 定量方法 

分 类 号：Q14[生物学—生态学]