论文部分内容阅读
在遥感和地理信息系统支持下,利用风蚀输沙率模型,对1986—2006年期间黑河下游重要生态功能区植被的防风固沙功能及其价值进行了估算。结果表明:1986、1996和2006年研究区植被防风固沙量分别为9 056×104t、4 972×104t和6 296×104t;不同植被覆盖的土地类型中,有林地防风固沙能力最强,其次为灌木林,低覆盖度草地最小;1986—2006年,区域植被生态系统的防风固沙功能呈现出先减弱后增强的趋势;植被防风固沙功能的空间分布差异性明显,防风固沙能力较高的区域主要零散分布在河流、湖泊沿岸等植被覆盖状况较好的区域;研究区域植被生态系统的防风固沙功能价值较大,2006年达到53.1×108元,明显高于当年研究区的GDP。
Using the model of wind erosion and sediment transport, the windbreak and sand fixation functions and their values of vegetation in the important ecological function areas in the lower reaches of the Heihe River from 1986 to 2006 were estimated with the support of remote sensing and geographic information system. The results showed that the windbreak and sediment concentrations of the vegetation in the study area in 1986, 1996 and 2006 were 9 056 × 104t, 4972 × 104t and 6 296 × 104t, respectively. Of the land cover types with different vegetation types, the windbreak and sand fixation capacity of the forestland was the strongest, followed by Shrubs and grasslands with low coverage were the smallest. From 1986 to 2006, the function of windbreak and sand fixation of regional vegetation ecosystems showed a trend of first decreasing and then increasing. The spatial distribution of windbreak and sand fixation was distinct, and the areas with high windbreak and sand fixation capacity were mainly scattered Distributed in the river, lakeshores and other vegetation cover better conditions; the study area vegetation ecosystem wind and sand fixation value is greater, in 2006 reached 53.1 × 108 yuan, significantly higher than that of the study area of GDP.