作者：李正国 ; 唐华俊 ; 杨鹏 ; 吴文斌 ; 陈仲新 ; 周清波 ; 张莉 ; 邹金秋

机构：Key Laboratory of Resources Remote Sensing & Digital Agriculture, Ministry of Agriculture;Institute of Agricultural Resources & Regional Planning, Chinese Academy of Agricultural Sciences;

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 Heilongjiang Province and some parts of the Sanjiang Plain. This finding indicated that the crop growth periods were shortened because of the elevated temperature; in contrast, the extended growth period usually meant a crop transformation from early- or middle-maturing varieties into middle or late ones.

年：2012

出版单位：Journal of Geographical Sciences

作者：李正国 ; 杨鹏 ; 唐华俊 ; 吴文斌 ; 陈仲新 ; 周清波 ; 邹金秋 ; 张莉

机构：中国农业科学院农业资源与农业区划研究所/农业部资源遥感与数字农业重点开放实验室;

关键词：作物物候期;;气候变化;;生育期;;东北三省

摘要：【目的】分析气候变化背景下东北三省主要作物类型(水稻、玉米、春小麦和大豆)典型物候期(出苗期、抽穗期和成熟期)的变化趋势。【方法】应用气候倾向率(θ)确定农业气候资源特征和典型物候期的变化趋势与整体对应关系。【结果】近20年来,东北三省大部分地区≥10℃初日出现了提前趋势,初霜日不断推迟,温度生长期天数持续增加,≥10℃积温总体呈升高趋势。在此背景下,水稻和玉米均出现了出苗期提前(0.04<θ<0.55 d.a-1和0.04<θ<0.35 d.a-1)、成熟期推后(0.09<θ<0.35 d.a-1和0.23<θ<0.38 d.a-1)、以及生育期延长(0.31<θ<1.26 d.a-1和0.11<θ<0.57 d.a-1)的趋势;大豆则表现为出苗期提前(0.01<θ<0.61d.a-1)、成熟期提前(0.18<θ<0.19 d.a-1)、生育期缩短(0.06<θ<0.17 d.a-1)的趋势;而春小麦典型物候期的变化趋势不明显。【结论】东北三省农业气候资源变化使作物生长期内温度适宜程度偏向好转,总体上有利于早种晚收、生育期长的作物品种的推广种植。

年：2011

出版单位：中国农业科学