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杨思遥,孟丹,李小娟,吴新玲.华北地区2001-2014年植被变化对SPEI气象干旱指数多尺度的响应.生态学报,2018,38(3):1028~1039 本文二维码信息
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华北地区2001-2014年植被变化对SPEI气象干旱指数多尺度的响应
Multi-scale responses of vegetation changes relative to the SPEI meteorological drought index in North China in 2001-2014
投稿时间:2016-11-24  
DOI: 10.5846/stxb201611242398
关键词华北地区  干旱  SPEI  植被变化  多尺度
Key WordsNorth China  drought  SPEI  vegetation changes  multi-scale
基金项目北京市教育委员会科技计划面上项目(KM201310028011)
作者单位E-mail
杨思遥 1 首都师范大学城市环境过程与数字模拟国家重点实验室培育基地, 北京 100048

2 资源环境与地理信息系统北京市重点实验室
, 北京 100048

3 首都师范大学资源环境与旅游学院
, 北京 100048 
 
孟丹 1 首都师范大学城市环境过程与数字模拟国家重点实验室培育基地, 北京 100048

2 资源环境与地理信息系统北京市重点实验室
, 北京 100048

3 首都师范大学资源环境与旅游学院
, 北京 100048 
mengdan@cnu.edu.cn 
李小娟 1 首都师范大学城市环境过程与数字模拟国家重点实验室培育基地, 北京 100048

2 资源环境与地理信息系统北京市重点实验室
, 北京 100048

3 首都师范大学资源环境与旅游学院
, 北京 100048 
 
吴新玲 1 首都师范大学城市环境过程与数字模拟国家重点实验室培育基地, 北京 100048

2 资源环境与地理信息系统北京市重点实验室
, 北京 100048

3 首都师范大学资源环境与旅游学院
, 北京 100048 
 
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摘要:
近年降水量的减少以及全球气候变暖的影响导致我国华北区域干旱程度加剧,影响植被生长状况,使得区域生态环境恶化。基于华北地区2001-2014年的TRMM及MODIS数据,以归一化植被指数NDVI、净初级生产力NPP、植被状态指数VCI作为植被状况表征指数,以标准化降水蒸散指数SPEI作为气象干旱表征指数,对华北地区近年的气象干旱及植被状况时空变化进行评价,并分析植被对干旱的多尺度响应。结果表明:(1)华北地区干旱在西南部地区呈明显加重趋势,东北部地区干旱状况有所好转;针对不同时间尺度的SPEI表示干旱的变化趋势,得出月份尺度干旱呈现干湿交替特征,选取SPEI时间尺度越长,干旱化趋势越明显;(2)NDVI与NPP所反馈的植被长势空间分布略有差异,总体而言华北地区植被状况大部分地区呈好转趋势,但研究区中部部分地区及部分沿海地区植被状况转差;(3)植被状况指数与SPEI指数在大部分地区呈正相关,NPP与SPEI的相关性强于NDVI与SPEI的相关性,且相关程度在草原地区及中高海拔地区最高,林地对干旱的敏感度最弱;各植被类型在植被生长季的多数月份对SPEI-3响应最明显,且在夏季相关程度最高,夏季及其前期的季尺度干旱更易影响植被生长状况,SPEI-12对植被的影响主要表现为影响植被生长季初期的植被状态。
Abstract:
In recent years, the decrease in precipitation and the effect of global warming have resulted in the increase in the degree of drought in the North China, affecting vegetation growth, and leading to the deterioration of the regional ecological environment. In this paper, based on the data of TRMM (Tropical Rainfall Measuring Mission) and MODIS (Moderate-resolution Imaging Spectroradiometer), Standardized Precipitation Evaporation Index (SPEI) was extracted to characterize meteorological drought status, while Normalized Difference Vegetation Index (NDVI), Net Primary Production (NPP), and Vegetation Condition Index (VCI) were used to characterize the vegetation status. Temporal and spatial variation of meteorological drought and vegetation, as well as the multi-scale response of vegetation changes relative to meteorological drought index in North China during 2001-2014 were comprehensive examined. The results indicated that drought showed a increasing trend in the southwestern region, whereas a decreasing trend in the northeastern region of North China. There were drought and wet alternating characteristics by month scale SPEI, and with the increase of time scale, a more obvious trend of drought characterized by SPEI were observed. In addition, the spatial distribution trends of NDVI and NPP in North China were slightly different, but generally, vegetation conditions have been improved in North China, while deteriorated in the central and coastal areas. Finally, the vegetation condition index were positively correlated with SPEI in most areas of North China. The degree of correlation was high in the grassland areas and middle-high altitude areas, whereas the response of forest land to drought was not sensitive relatively. The response of each vegetation type to SPEI-3 was most obvious in vegetation growing season, especially in the summer, and SPEI-12 mainly affected the early growth stage during the vegetation growing season. The results of meteorological drought on vegetation would assists on drought research in north China.
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