2007—2017年呼伦贝尔沙地植被覆盖度变化及驱动因素研究

利用呼伦贝尔沙地及周边区域2007-2017年生长期遥感和气象数据,结合第五次全国荒漠化和沙化监测数据,对区域内植被覆盖度变化及气候因素的响应进行了研究。结果表明:2007—2017年呼伦贝尔沙地植被覆盖度呈现先上升后下降的趋势,2007-2013年植被覆盖度呈现整体增加的趋势,年均增加2.76%,显著增加的区域所占面积比例为20.52%,2013—2017年植被覆盖度呈现整体下降的趋势,年均下降6.57%,显著下降的区域所占面积比例为15.69%;区域植被覆盖度年际变化与降水量呈现显著正相关关系,与温度呈现非显著性负相关关系,与日照的相关性不明显。

Vegetation Cover Change and Response to Climate Change from 2007 to 2017 in Hulun Buir Sandy Land

In this study, the growing season satellite and meteorological data from 2007 to 2017 were used to analyze the vegetation cover change and responses to climatic factors in combination with the fifth national sandy land surveying data. Results showed that the vegetation cover in Hulun Buir increased first and then decreased during 2007 to 2017. From 2007 to 2013 , vegetation cover increased overall, with annual increase rate of 2. 76 %, and the significant increase areas accounting for 20. 52 %. From 2013 to 2017 , vegetation cover decreased overall, with annual decrease rate of 6. 57 %, and the significant decrease areas accounting for 15. 69 %. The vegetation cover annual change has significant positive correlation with precipitation, non - significant negative correlation with temperature, and not obvious correlation with sunlit.