摘要
植被覆盖是评价生态环境的重要指标之一。基于1998-2013年SPOT VEGETATION数据集,采用趋势分析、偏相关分析及计算Hurst指数等方法,反演了釜溪河流域NDVI分布的时空格局及其变化趋势;并结合该地区同期降水量和温度数据,利用相关系数法对釜溪河流域植被覆盖变化的驱动因子进行分析。研究表明1998-2013年间釜溪河流域植被覆盖表现出上升趋势,增速为0.24%/16a;Hurst指数计算结果显示,流域内植被反向变化特征强于同向特征,结合NDVI趋势图,未来植被改善区域面积所占比例为60.98%,持续退化面积所占比重为5.97%,主要分布于自贡市南部及其他环绕城镇地区;植被覆盖变化主要以非气候因子驱动型为主,其面积所占比例为88.48%,而影响植被生长的气候因子中气温的作用强于降水的作用。
Vegetation coverage is an important index to evaluate the environment. On the basis of SPOT VEGETATION from 1998 to 2013,distribution,spatial pattern and trends of NDVI were analyzed by the methods of trend analysis,Hurst exponent and partial correlation analysis in Fuxi River Basin. Combined with precipitation and temperature,vegetation cover change driving factors were analyzed using correlation coefficient. The result indicates that vegetation cover shows a rising trend and the growth rate is 0. 24%/16 a. Hurst exponent shows that the reverse characteristics of vegetation coverage change are stronger than the same characteristic in Fuxi River Basin,and 60. 98% of the total area will follow a continuous increasing trend with the slope of NDVI. The proportion of persistent degradation area is 5. 97%,mainly distributed in the southern part of Zigong and surrounding towns. Vegetation cover change is mainly driven by non-climatic factors,which accounting for 88. 48% of the entire area. The growth of vegetation is more effected by temperature than precipitation in the climatic factors.
出处
《四川理工学院学报（自然科学版）》
CAS
2017年第5期83-89,共7页
Journal of Sichuan University of Science & Engineering(Natural Science Edition)
基金
四川省科技厅项目(2017GZ0303)
自贡市科技局项目(2016DZ11)
江河流域生态环境的集成感知与应用院士(专家)工作站项目(2016YSGZZ02)
企业信息化与物联网测控技术四川省重点实验室项目(2016WYY01)
四川省智慧旅游研究基地项目(ZHY17-01)
