摘要
植被在全球变化中影响着地-气系统的能量平衡,是自然和人文因素对环境影响的敏感指标。分析地表植被的覆盖现状并探究影响植被变化的驱动力因素对区域生态恢复以及区域经济发展和区域生态文明建设都有促进作用。本研究基于中分辨率成像光谱仪-归一化植被指数(MODIS-NDVI)数据,结合宝鸡11个气象站的气温和降水量实测数据、净初级生产力(NPP)以及宝鸡统计年鉴数据,采用趋势分析方法、Pearson相关分析法、主成分分析方法对2001-2013年宝鸡地区植被覆盖的时空演化特征进行了分析,并对自然驱动因子和人为驱动因子双重影响下的宝鸡地区植被覆盖演化状况进行了综合评价。结果显示:(1)2001-2013年宝鸡地区年均NDVI以0.025/10a的速度上升,比三北防护林工程区1982-2006年植被覆盖的增速(0.007/10a)快,且2001-2002年、2003-2004年两个年份段为年均NDVI值的两次高恢复期;(2)植被覆盖以轻度改善为主,基本不变和中度改善次之,严重退化和中度退化最弱。植被覆盖恢复状况整体上呈稳中上升的趋势(个别地区除外);(3)自然因素中的降水量和NPP是制约植被生长的主要因素。整体来看,人为因素相对于自然因素对宝鸡全区的植被覆盖影响较大,贡献率在90%左右,呈先减小后增加的趋势。
Vegetation influences the energy balance of the Earth-atmosphere system in the global change and is a sensitive indicators of natural and human factors to environmental impact. Analysis of the status of surface vegetation cover and exploration of the driving forces that affect vegetation change will promote the restoration of regional ecology and the development of the regional economy and regional ecological civilization. This study was based on the Moderate Resolution Imaging Spectroradiometer-Normalized Difference Vegetation Index（ MODIS-NDVI） combined with temperature and precipitation data from 11 meteorological stations in Baoji,as well as net primary productivity（ NPP） and Baoji statistical yearbook data. We applied trend analysis, Pearson correlation analysis, and principalcomponent analysis to analyze the vegetation in Baoji area from 2001 to 2013. The spatiotemporal evolution of vegetation cover in Baoji area under the dual effects of natural and anthropogenic driving factors was analyzed comprehensively. Results showed that：（ 1） From2001-2013,the annual average NDVI in Baoji increased by 0.025/10 years,which was faster than the growth rate of vegetation coverage in the Three-North Shelter Forest Program（ TNSFP） from 1982 to 2006. There were two high recovery periods of annual NDVI,that is,2001 to 2002 and 2003 to 2004;（ 2） Overall,vegetation cover was mildly improved,followed by unchanged and moderately improved,severely and moderately degraded. The restoration of vegetation cover exhibited a steady increasing tendency（ except individual areas of the study site）;（ 3） Precipitation and NPP of natural factors were the main aspects restricting vegetation growth. Human factors had more influence on vegetation coverage of Baoji area than natural factors,contributing about 90% and showing a decreasing then increasing trend.
作者
王静
万红莲
张翀
Wang Jing;Wan Hong-Lian;Zhang Chong(Shaanxi Key Laboratory of Disaster Monitoring and Mechanism Simulation, Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China;College of Geography and Environment, Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China)
出处
《植物科学学报》
CAS
CSCD
北大核心
2018年第3期336-344,共9页
Plant Science Journal
基金
国家自然科学基金(41601016)
陕西省哲学社会科学基金(2017E003)
陕西省教育厅重点实验室项目(09JS073)
宝鸡文理学院自然地理学陕西省重点学科基金(15JS008)
