[目的]研究鄂尔多斯地区生态格局以及在全球变化下的自然演变规律,揭示中国西部矿区人工扰动生态环境的时空变化。[方法]利用1982—2012年GIMMS NDVI 3g数据集和年均气温、降水量等气象数据,分别进行最大值合成、反距离加权法插值、线...[目的]研究鄂尔多斯地区生态格局以及在全球变化下的自然演变规律,揭示中国西部矿区人工扰动生态环境的时空变化。[方法]利用1982—2012年GIMMS NDVI 3g数据集和年均气温、降水量等气象数据,分别进行最大值合成、反距离加权法插值、线性回归与变化率分析、相关性分析等处理,揭示植被覆盖的时空变化趋势下蕴含的植物生理学机理,及其对气温和降水变化趋势的响应特征。[结果]鄂尔多斯地区植被返青期(start of season,SOS)始于4月下旬,枯黄期(end of season,EOS)结束于11月上旬,植被生长期(duration of season,DOS)NDVI初始阈值为0.12,平均生长期为198d;31a间鄂尔多斯地区植被绿度变化率(slope)为0.0023,植被变化趋势逐像元回归分析表明研究区80.8%的植被有轻微改善;31a间鄂尔多斯地区NDVI变化与年均气温和降水量的相关性分别为0.054和0.400。[结论]31a间鄂尔多斯地区植被返青期有提前趋势,枯黄期有滞后趋势,生长期有延长趋势;研究区大部分区域植被均有轻微改善;年均气温与降水量均呈现升高趋势,NDVI变化受温度和降水的共同作用,且NDVI最大值增高与年均降水量增加相关性较高,与年均气温升高相关性较低。展开更多
[Objectives]To investigate the dynamic evolution of vegetation index in Qinling Mountains from 2000 to 2019.[Methods]Based on MODIS13 NDVI data,the regularity of dynamics of vegetation index in Qinling Mountains from ...[Objectives]To investigate the dynamic evolution of vegetation index in Qinling Mountains from 2000 to 2019.[Methods]Based on MODIS13 NDVI data,the regularity of dynamics of vegetation index in Qinling Mountains from 2000 to 2019 was analyzed using maximum value composite method and trend analysis method.[Results]The NDVI in Qinling Mountains was in the range of 0.799-0.863 during 2000-2019.It showed a slow upward trend overall,and the growth rate was 0.033/(10 a).The area with declined NDVI accounted for 4.111%of the study area.It was distributed in the surrounding areas of cities,and was manly affected by the process of urbanization.The improved area accounted for 36.224%of the study area.It was widely distributed in Qinling Mountains,and was mainly affected by natural factors and national policies.[Conclusions]This study provides a basis for the protection of ecological environment and the sustainable development and utilization of resources in Qinling Mountains.展开更多
文摘[目的]研究鄂尔多斯地区生态格局以及在全球变化下的自然演变规律,揭示中国西部矿区人工扰动生态环境的时空变化。[方法]利用1982—2012年GIMMS NDVI 3g数据集和年均气温、降水量等气象数据,分别进行最大值合成、反距离加权法插值、线性回归与变化率分析、相关性分析等处理,揭示植被覆盖的时空变化趋势下蕴含的植物生理学机理,及其对气温和降水变化趋势的响应特征。[结果]鄂尔多斯地区植被返青期(start of season,SOS)始于4月下旬,枯黄期(end of season,EOS)结束于11月上旬,植被生长期(duration of season,DOS)NDVI初始阈值为0.12,平均生长期为198d;31a间鄂尔多斯地区植被绿度变化率(slope)为0.0023,植被变化趋势逐像元回归分析表明研究区80.8%的植被有轻微改善;31a间鄂尔多斯地区NDVI变化与年均气温和降水量的相关性分别为0.054和0.400。[结论]31a间鄂尔多斯地区植被返青期有提前趋势,枯黄期有滞后趋势,生长期有延长趋势;研究区大部分区域植被均有轻微改善;年均气温与降水量均呈现升高趋势,NDVI变化受温度和降水的共同作用,且NDVI最大值增高与年均降水量增加相关性较高,与年均气温升高相关性较低。
基金Project of Shaanxi Provincial Land Engineering Construction Group(DJNY2021-33).
文摘[Objectives]To investigate the dynamic evolution of vegetation index in Qinling Mountains from 2000 to 2019.[Methods]Based on MODIS13 NDVI data,the regularity of dynamics of vegetation index in Qinling Mountains from 2000 to 2019 was analyzed using maximum value composite method and trend analysis method.[Results]The NDVI in Qinling Mountains was in the range of 0.799-0.863 during 2000-2019.It showed a slow upward trend overall,and the growth rate was 0.033/(10 a).The area with declined NDVI accounted for 4.111%of the study area.It was distributed in the surrounding areas of cities,and was manly affected by the process of urbanization.The improved area accounted for 36.224%of the study area.It was widely distributed in Qinling Mountains,and was mainly affected by natural factors and national policies.[Conclusions]This study provides a basis for the protection of ecological environment and the sustainable development and utilization of resources in Qinling Mountains.
