内蒙古羊草草原物候及其对气候变化的响应  

Phenology of Leymus Chinensis Steppe in Inner Mongolia and Its Response to Climate Changes

作　　者：范德芹[1] 赵学胜[1] 郑周涛[2] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]北京师范大学资源学院,北京100875

出　　处：《地理与地理信息科学》2016年第6期81-86,共6页Geography and Geo-Information Science

基　　金：国家自然科学基金项目(41171306;41601456)

摘　　要：为了有效分析内蒙古羊草草原的物候及其对气候变化的响应,基于NOAA归一化差值植被指数(NDVI)时序数据,利用S-G滤波拟合方法对原始NDVI时序数据进行了重建,然后采用滑动平均法对重建后的NDVI数据进行了物候期识别,利用地面物候观测数据对识别结果的验证结果表明,"S-G滤波+滑动平均法"识别的物候期与地面物候观测结果具有较好的一致性。在此基础上,获取了各气象站点的物候期及其生长季长度,结合气候数据进行物候期和生长季长度对气候变化的响应分析显示,返青期呈提前趋势,主要与当年春季温度升高和前一年10月到当年4月的累积降水量增加相关;黄枯期呈提前趋势,主要与当年8月份温度升高相关;生长季长度呈延长趋势,主要是由返青期提前的幅度较黄枯期提前幅度更大所致。Along with the global climate change,plant phenology has also changed.In order to analyze the response of phenology for Leymus chinensis steppe in Inner Mongolia to climate effectively,we first used the Savitzky-Golay function to reconstruct the National Oceanic and Atmospheric Administration Normalized Difference Vegetation Index(NDVI)time series for the selected test pixels,then used moving average methods to derive the phenology for Leymus chinensis steppe.The performance of the methods for green-up date and the end of season date identification were verified by the ground observation samples.The phenology dates identified by the moving average method using the reconstructed NDVI time series,were well consistent with the observed ground phenology data.The correlations coefficient(r)of the phenology derived from remote sensing and the ground observation were between 0.43 and 0.63,while the significant level(P)were between 0.005 and 0.05.The differences of the phenology derived from remote sensing and the ground observation were between 10 and 30days.On this basis,we acquired phenology stages(e.g.green-up dates and end of season dates)and the length of the growing season at each weather station,and analyzed their response to climate change combing with climate data(temperature and precipitation data)from 1982to2013.The result showed that the mean green-up dates for Leymus chinensis steppe in Inner Mongolia were mainly occurred between DOY(Day Of Year)110and 130,and the green-up dates were advanced at a rate of 2.2days per decade during 1982-2013.The mean end of season dates for Leymus chinensis steppe in Inner Mongolia were mainly occurred between DOY 255and275,which were slightly advanced during 1982-2013.The trend of green-up dates for Leymus chinensis steppe in Inner Mongolia advanced,which was related with the rising spring temperature and the increasing accumulated precipitation between October of the last year and April of this year.The trend of end of season dates also advanced,which was related with the

关 键 词：羊草 草原 NDVI 物候 遥感 气候 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]