气候和土地利用变化对中国北方农牧交错带植被覆盖变化的影响

基于1986、2000年中国北方农牧交错带的遥感影像及研究区的气象数据，利用植被覆盖度信息提取模型研究了1986—2000年间研究区植被覆盖度的时空变化，并分析了气候和土地利用变化对植被覆盖度变化的影响.结果表明：1986—2000年，研究区高盖度植被的面积缩减，低盖度植被的面积增加；植被覆盖升高区主要位于该区东北段的东部、北段的西部和西北段的西部，其他地段的植被覆盖明显退化；植被覆盖度与降水、干燥度指数呈正相关，与温度呈负相关；不同土地利用类型的植被覆盖度变化方向和程度各异.

Effects of climate and land use change on the changes of vegetation coverage in farming-pastoral ecotone of Northern China.

Based on the remote sensing images and the meteorological data in 1986 and 2000, and by using the model of extracting vegetation coverage, the spatiotemporal changes of vegetation coverage in the farming pastoral ecotone of Northern China in 1986-2000 were studied, with the effects of climate and land use change on the changes analyzed. The results showed that in this ecotone, the area with lower vegetation coverage was increasing, while that with higher vegetation coverage was in adverse. The regions with increasing vegetation coverage were mainly in the east of northeast section, the west of north section, and the west of northwest section of the ecotone, while the vegetation coverage in the other sections was obviously degraded. The vegetation coverage were positively correlated with precipitation and aridity index, but negatively correlated with temperature. The change direction and extent of the vegetation coverage varied with land use types.