日光诱导叶绿素荧光在估算半干旱草原生态系统总初级生产力中的应用  

Application of Sun-Induced Chlorophyll Fluorescence in Estimating Gross Primary Productivity of a Semi-Arid Grassland Ecosystem

作　　者：郝勇 姜海梅 叶昊天[1,2] 曹乐 王成刚 HAO Yong;JIANG Hai-mei;YE Hao-tian;CAO Le;WANG Cheng-gang(Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing 210044,China;School of Atmospheric Physics,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]中国气象局气溶胶与云降水重点开放实验室,南京210044 [2]南京信息工程大学大气物理学院,南京210044

出　　处：《内蒙古大学学报（自然科学版）》2020年第2期154-162,共9页Journal of Inner Mongolia University：Natural Science Edition

基　　金：国家重点研发计划(2017YFC0209801);国家自然科学基金(41505006)。

摘　　要：陆地生态系统总初级生产力(gross primary productivity,GPP)是陆地生态系统碳循环研究的重要组成部分。日光诱导叶绿素荧光(sun-induced chlorophyll fluorescence,SIF)与GPP之间存在的密切联系使得SIF逐渐被应用于全球和区域的GPP的模拟研究中。利用锡林浩特国家气候观象台涡度相关通量观测系统数据以及GOME-2卫星Level2SIF数据,分析2010~2012年生长季锡林郭勒半干旱区针茅(Stipa)草原生态系统GPP与SIF之间的联系,并对SIF进行光学几何校正以消除观测引起的误差,分析光学几何校正对该生态系统SIF的改善效果,探讨SIF在该生态系统中模拟GPP的应用潜力。结果显示在该生态系统生长季GPP与SIF之间具有较显著的线性相关性,在15天和8天的时间尺度上R^2分别为0.564、0.373;经过光学几何校正可以改善SIF与GPP之间相关性,但其改善受到植被叶面积指数的影响导致效果并不显著;2010年和2011年,生长季降水量较少,生态系统受到一定程度的干旱胁迫使得植被触发光保护机制,造成SIF和GPP变化趋势存在一定差异。研究结果表明,SIF在模拟和监测半干旱针茅草原生态系统GPP时,效果受土壤干旱程度的影响,适用性有限。Gross primary productivity(GPP)of terrestrial ecosystem is an important part of terrestrial ecosystem carbon cycle research.Since a close relationship existed between sun-induced chlorophyll fluorescence(SIF)and Gross Primary Productivity,SIF has been gradually applied to simulate global and regional GPP.In this research,data observed by eddy covariance system from Xilinhot National Climate Observatory and SIF data from GOME-2 Level2 were used to analysis the relationship between GPP and SIF during the growing seasons from 2010 to 2012 for Xilin Gol League semi-arid Stipagrassland ecosystem.In order to eliminate the observation error,optical geometry correction was used to correct the GOME-2 SIF and then its effectiveness was evaluated.Finally,the potentiality of SIF in estimating GPP in this grassland ecosystem was discussed.The research find that SIF and GPP had a good linear correlation during growing seasons in this semi-arid grassland ecosystem,and R^2 between them during 15-day average and 8-day average were 0.564 and 0.373,respectively.We also found that the relationship between SIF and GPP could be improved after optical geometry correction.However,the improvement was not obvious for the influence caused by relatively low leaf area index in this area.Low precipitation in 2010 and 2011 leaded to a certain degree of drought stress for this ecosystem,which caused photoinhibition of plant photosynthesis,resulting in some differences in the trends of SIF and GPP.These results revealed that SIF could be effected by the arid extent of soil when simulating and monitoring GPP,which may made its applicability limited.

关 键 词：半干旱草原 总初级生产力 日光诱导叶绿素荧光 光学几何校正 

分 类 号：P49[天文地球—大气科学及气象学]