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2001-2010年秦岭森林物候时空变化遥感监测

DOI: 10.18306/dlkxjz.2015.10.010, PP. 1297-1305

Keywords: EVI,时间序列谐波分析,物候,时空变化,秦岭

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Abstract:

植被物候是陆地生态系统对全球气候变化响应的最佳指示器,研究其时空变化对深入理解陆面水热过程、碳循环过程及预测陆地生态系统的时空变化具有重要意义。本文采用2001-2010年MODISMOD09A1产品,通过引入MOD09A1的时间控制层DOY(DayofYear)提高EVI的时间精度;采用最大变化速率法和阈值法相结合提取秦岭森林物候期。结果表明,随着水热条件变化,由低海拔至高海拔,东南向西北,生长季始期(StartofGrowthSeason,SOG)逐渐推迟,集中在第81~120d(即从3月下旬-4月末);生长季末期(EndofGrowthSeason,EOG)逐渐提前,集中在第270~311d(10月初-11月上旬);生长季长度(LengthofGrowthSeason,LOG)逐渐缩短,集中在150~230d。秦岭森林物候期与海拔关系密切,海拔每升高100m,SOG推迟2d,EOG提前1.9d,LOG缩短3.9d。2001-2010年,森林SOG提前、EOG延后和LOG延长主要分布于秦岭中高海拔区;SOG延后、EOG提前和LOG缩短主要分布在海拔1000m以下部分区域。高海拔区物候的年际变化要比低海拔区复杂,2000m以上区域SOG提前、EOG提前、LOG缩短。上述研究结果量化了不同海拔梯度森林的物候差异,揭示了近10年秦岭森林物候的时空格局,可为秦岭地区生态环境评价和保护提供科学依据。

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