Spatio-temporal responses of cropland phenophases to climate change in Northeast China  

作　　者：LI Zhengguo TANG Huajun YANG Peng WU Wenbin CHEN Zhongxin ZHOU Qingbo ZHANG Li ZOU Jinqiu 

机构地区：[1]Key Laboratory of Resources Remote Sensing ＆ Digital Agriculture, Ministry of Agriculture [2]Institute of Agricultural Resources ＆ Regional Planning, Chinese Academy of Agricultural Sciences

出　　处：《Journal of Geographical Sciences》2012年第1期29-45,共17页地理学报（英文版）

基　　金：National Basic Program of China （973 Program）,No.2010CB951502; National Natural Science Foundation of China,No.40930101,No.41001381 and No.41001246; Ministry of Finance of China through Non-profit National Research Institute,No.IARRP-2011-015

摘　　要：We investigated the responses of cropland phenophases to changes of agricultural thermal conditions in Northeast China using the SPOT-VGT Normalized Difference Vegetation Index （NDVI） ten-day-composed time-series data, observed crop phenophases and the climate data collected from 1990 to 2010. First, the phenological parameters, such as the dates of onset-of-growth, peak-of-growth and end-of-growth as well as the length of the growing season, were extracted from the smoothed NVDI time-series dataset and showed an obvious correlation with the observed crop phenophases, including the stages of seedling, heading, maturity and the length of the growth period. Secondly, the spatio-temporal trends of the major thermal conditions （the first date of ≥10℃, the first frost date, the length of the temperature-allowing growth period and the accumulated temperature （AT） of ≥10℃） in Northeast China were illustrated and analyzed over the past 20 years. Thirdly, we focused on the responses of cropland phenophases to the thermal conditions changes. The results showed that the onset-of-growth date had an obvious positive correlation with the first date of ≥10℃ （P 0.01）, especially in the northern part of the Songnen Plain, the eastern part of the Sanjiang Plain and the middle and eastern parts of Jilin Province. For the extracted length of growing season and the observed growth period, notable correlations were found in almost same regions （P 0.05）. However, there was no obvious correlation between the end-of-growth date and the first frost date in the study area. Opposite correlations were observed between the length of the growing season and the AT of ≥10℃. In the northern part of the Songnen Plain, the eastern part of the Sanjiang Plain and the middle part of Jilin and Liaoning Provinces, the positive correlation coefficients were higher than the critical value of 0.05, whereas the negative correlation coefficients reached a level of 0.55 （P 0.05） in the middle and southern parts of HeiloWe investigated the responses of cropland phenophases to changes of agricultural thermal conditions in Northeast China using the SPOT-VGT Normalized Difference Vegetation Index （NDVI） ten-day-composed time-series data, observed crop phenophases and the climate data collected from 1990 to 2010. First, the phenological parameters, such as the dates of onset-of-growth, peak-of-growth and end-of-growth as well as the length of the growing season, were extracted from the smoothed NVDI time-series dataset and showed an obvious correlation with the observed crop phenophases, including the stages of seedling, heading, maturity and the length of the growth period. Secondly, the spatio-temporal trends of the major thermal conditions （the first date of ≥10℃, the first frost date, the length of the temperature-allowing growth period and the accumulated temperature （AT） of ≥10℃） in Northeast China were illustrated and analyzed over the past 20 years. Thirdly, we focused on the responses of cropland phenophases to the thermal conditions changes. The results showed that the onset-of-growth date had an obvious positive correlation with the first date of ≥10℃ （P 0.01）, especially in the northern part of the Songnen Plain, the eastern part of the Sanjiang Plain and the middle and eastern parts of Jilin Province. For the extracted length of growing season and the observed growth period, notable correlations were found in almost same regions （P 0.05）. However, there was no obvious correlation between the end-of-growth date and the first frost date in the study area. Opposite correlations were observed between the length of the growing season and the AT of ≥10℃. In the northern part of the Songnen Plain, the eastern part of the Sanjiang Plain and the middle part of Jilin and Liaoning Provinces, the positive correlation coefficients were higher than the critical value of 0.05, whereas the negative correlation coefficients reached a level of 0.55 （P 0.05） in the middle and southern parts of Heilo

关 键 词：cropland phenophase SPOT/VGT NDVI time series climate change Northeast China 

分 类 号：S663.1[农业科学—果树学] P467[农业科学—园艺学]