Based on TIMESAT 3.2 platform, MODIS NDVI data(2000–2015) of Qaidam Basin are fitted, and three main phenological parameters are extracted with the method of dynamic threshold, including the start of growth season(SG...Based on TIMESAT 3.2 platform, MODIS NDVI data(2000–2015) of Qaidam Basin are fitted, and three main phenological parameters are extracted with the method of dynamic threshold, including the start of growth season(SGS), the end of growth season(EGS) and the length of growth season(LGS). The spatial and temporal variation of vegetation phenology and its response to climate changes are analyzed respectively. The conclusions are as follows:(1) SGS is mainly delayed as a whole. Areas delayed are more than the advanced in EGS, and EGS is a little delayed as a whole. LGS is generally shortened.(2) With the altitude rising, SGS is delayed, EGS is advanced, and LGS is shortened and phenophase appears a big variation below 3000 m and above 5000 m.(3) From 2000 to 2015, the temperature appears a slight increase along with a big fluctuation, and the precipitation increases evidently.(4) Response of phenophase to precipitation is not obvious in the low elevation humid regions, where SGS arrives early and EGS delays; while, in the upper part of the mountain regions, SGS delays and EGS advances with temperature rising, SGS arrives early and EGS delays with precipitation increasing.展开更多
植物物候记录了植物重复生命周期事件的发生时间,是指示全球变化的重要指标。植物物候研究有助于理解生态系统对全球变化的响应,也是模拟陆地生态系统的物质和能量平衡的重要基础。本数据集基于过去70年欧洲物候项目(Pan European Pheno...植物物候记录了植物重复生命周期事件的发生时间,是指示全球变化的重要指标。植物物候研究有助于理解生态系统对全球变化的响应,也是模拟陆地生态系统的物质和能量平衡的重要基础。本数据集基于过去70年欧洲物候项目(Pan European Phenology Project,PEP725)整编的6种代表性木本植物的地面观测物候数据,采用三种考虑春季冷激和积温累积过程的物候模型(Unified、Unichill和时空耦合模型)在大洲尺度上对物候数据进行建模和分析,研制了欧洲地区代表性木本植物格网物候数据集。本数据集包含1951–2021年欧洲地区(34°57′N–72°3′N,25°3′W–40°3′E)6种木本植物的逐年展叶始期和开花始期格网数据,空间分辨率为0.1°,时间分辨率为天。数据集的质量评估表明,欧洲地区各物种展叶始期和开花始期平均误差分别为7.9和7.6天,与其他区域尺度研究中春季物候的模拟误差接近,因此本文格网物候数据具有较高的模拟精度。本数据集旨在更好地表征欧洲地区大洲尺度植物物候的时空格局,为区域其他来源的植物物候数据产品提供有价值的验证参考,亦可为全球变化和陆地生态系统模拟等研究领域提供支撑物候数据。展开更多
为模拟气候变化对夏玉米发育期影响,本文将河南省划分为4个夏玉米主栽区,分区进行主栽品种遗传参数调试验证,确定各区域品种平均遗传参数。将未来气候变化情景（A 2和B 2）下,2 0 2 0 s、2 0 5 0 s和2 0 8 0 s各时段的温度和降水增量加...为模拟气候变化对夏玉米发育期影响,本文将河南省划分为4个夏玉米主栽区,分区进行主栽品种遗传参数调试验证,确定各区域品种平均遗传参数。将未来气候变化情景（A 2和B 2）下,2 0 2 0 s、2 0 5 0 s和2 0 8 0 s各时段的温度和降水增量加上基准值,模拟未来气候变化对河南省夏玉米发育期的影响。模型调参验证结果表明：各区域品种遗传参数存在一定差异,豫西地区当前种植品种播种-开花所需积温高于其它地区,而豫北和豫东当前种植品种开花-成熟所需积温高于其它地区;各区开花期调参和验证误差R M S E为2-4 d,相对误差N R M S E均小于1 0%;各区域成熟期调参误差R M S E均小于4 d,验证误差R M S E为3-7 d,除豫西区外,各区域调参及验证期间的成熟期相对误差N R M S E均小于1 0%。表明C E R E S-M a i z e模型对河南省各区域夏玉米发育期模拟精度均较高。未来气候变化影响模拟结果表明：A 2和B 2情景下,夏玉米营养生长期平均缩短4.7 d和3.1 d,全生育期平均缩短1 2.9 d和8.6 d。夏玉米生育期缩短日数与各时段增温幅度趋势一致,全省4个区域中豫西区生育期日数缩短最多。展开更多
基金National Natural Science Foundation of China,No.40971118Physical Geography Key Disciplines Construction Subjects of Hebei Province
文摘Based on TIMESAT 3.2 platform, MODIS NDVI data(2000–2015) of Qaidam Basin are fitted, and three main phenological parameters are extracted with the method of dynamic threshold, including the start of growth season(SGS), the end of growth season(EGS) and the length of growth season(LGS). The spatial and temporal variation of vegetation phenology and its response to climate changes are analyzed respectively. The conclusions are as follows:(1) SGS is mainly delayed as a whole. Areas delayed are more than the advanced in EGS, and EGS is a little delayed as a whole. LGS is generally shortened.(2) With the altitude rising, SGS is delayed, EGS is advanced, and LGS is shortened and phenophase appears a big variation below 3000 m and above 5000 m.(3) From 2000 to 2015, the temperature appears a slight increase along with a big fluctuation, and the precipitation increases evidently.(4) Response of phenophase to precipitation is not obvious in the low elevation humid regions, where SGS arrives early and EGS delays; while, in the upper part of the mountain regions, SGS delays and EGS advances with temperature rising, SGS arrives early and EGS delays with precipitation increasing.
文摘植物物候记录了植物重复生命周期事件的发生时间,是指示全球变化的重要指标。植物物候研究有助于理解生态系统对全球变化的响应,也是模拟陆地生态系统的物质和能量平衡的重要基础。本数据集基于过去70年欧洲物候项目(Pan European Phenology Project,PEP725)整编的6种代表性木本植物的地面观测物候数据,采用三种考虑春季冷激和积温累积过程的物候模型(Unified、Unichill和时空耦合模型)在大洲尺度上对物候数据进行建模和分析,研制了欧洲地区代表性木本植物格网物候数据集。本数据集包含1951–2021年欧洲地区(34°57′N–72°3′N,25°3′W–40°3′E)6种木本植物的逐年展叶始期和开花始期格网数据,空间分辨率为0.1°,时间分辨率为天。数据集的质量评估表明,欧洲地区各物种展叶始期和开花始期平均误差分别为7.9和7.6天,与其他区域尺度研究中春季物候的模拟误差接近,因此本文格网物候数据具有较高的模拟精度。本数据集旨在更好地表征欧洲地区大洲尺度植物物候的时空格局,为区域其他来源的植物物候数据产品提供有价值的验证参考,亦可为全球变化和陆地生态系统模拟等研究领域提供支撑物候数据。
文摘为模拟气候变化对夏玉米发育期影响,本文将河南省划分为4个夏玉米主栽区,分区进行主栽品种遗传参数调试验证,确定各区域品种平均遗传参数。将未来气候变化情景（A 2和B 2）下,2 0 2 0 s、2 0 5 0 s和2 0 8 0 s各时段的温度和降水增量加上基准值,模拟未来气候变化对河南省夏玉米发育期的影响。模型调参验证结果表明：各区域品种遗传参数存在一定差异,豫西地区当前种植品种播种-开花所需积温高于其它地区,而豫北和豫东当前种植品种开花-成熟所需积温高于其它地区;各区开花期调参和验证误差R M S E为2-4 d,相对误差N R M S E均小于1 0%;各区域成熟期调参误差R M S E均小于4 d,验证误差R M S E为3-7 d,除豫西区外,各区域调参及验证期间的成熟期相对误差N R M S E均小于1 0%。表明C E R E S-M a i z e模型对河南省各区域夏玉米发育期模拟精度均较高。未来气候变化影响模拟结果表明：A 2和B 2情景下,夏玉米营养生长期平均缩短4.7 d和3.1 d,全生育期平均缩短1 2.9 d和8.6 d。夏玉米生育期缩短日数与各时段增温幅度趋势一致,全省4个区域中豫西区生育期日数缩短最多。
