Spatially-explicit monitoring of crop photosynthetic capacity through the use of space-based chlorophyll fluorescence data
Spatially-explicit monitoring of crop photosynthetic capacity through the use of space-based chlorophyll fluorescence data
复制标题
通过使用天基叶绿素荧光数据对作物光合能力进行空间明确监测
DOI:
10.1016/j.rse.2018.03.031
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发表时间:
2018-06
影响因子:
13.5
通讯作者:
Kaiyu Guan
中科院分区:
文献类型:
--
作者:
Yongguang Zhang;Luis Guanter;Joanna Joiner;Lian Song;Kaiyu Guan
Plant functional traits such as photosynthetic capacity are critical parameters for terrestrial biosphere models. However, their spatial and temporal characteristics are still poorly represented. In this study, we used satellite observations of sun-induced fluorescence (SIF) to estimate top-of-canopy photosynthetic capacity (maximum carboxylation rate,Vcmaxat a reference temperature of 25 °C) for crops, which was in turn utilized to simulate regional gross primary production (GPP). We first estimate the key parameter,Vcmax, in the widely-used FvCB photosynthesis model using field measurements of CO2and water fluxes during 2007–2012 at seven crop eddy covariance flux sites over the US Corn Belt. The results showed that satellite far-red SIF retrievals have a stronger link toVcmaxat the seasonal scale (R2= 0.70 for C4 and R2= 0.63 for C3 crop) as compared with widely-used vegetation indices. We calibrate an empirical model linkingVcmaxwith SIF that was used to estimate spatially and temporally varying cropVcmaxfor the US Corn Belt region. The resultingVcmaxmaps are used together with meteorological data from MERRA reanalysis data and vegetation structural parameters derived from the satellite-based spectral reflectance data to constrain the Soil-Canopy Observation of Photosynthesis and Energy (SCOPE) balance model in order to estimate regional crop GPP. Our results show a substantial improvement in the seasonal and spatial patterns of cropland GPP when compared with crop yield inventory data. The evaluation with tall tower atmospheric CO2measurements further supports our estimation of spatiotemporalVcmaxfrom space-borne SIF. Considering that SIF has a direct link to photosynthetic activity, our findings highlight the potential to infer regionalVcmaxusing remotely sensed SIF data and to use this information for a better quantification of regional cropland carbon cycles.
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DOI:
10.1016/0005-2728(87)90190-3
发表时间:
1987-11-19
期刊:
BIOCHIMICA ET BIOPHYSICA ACTA
影响因子:
--
作者:
WEIS, E;BERRY, JA
通讯作者:
BERRY, JA
DOI:
10.5065/d6rr1w7m
发表时间:
2013
期刊:
--
影响因子:
--
作者:
K. Oleson;M. Lawrence;B. Bonan;B. Drewniak;Maoyi Huang;D. Koven;S. Levis;Fang Li;J. Riley
通讯作者:
K. Oleson;M. Lawrence;B. Bonan;B. Drewniak;Maoyi Huang;D. Koven;S. Levis;Fang Li;J. Riley
影响因子:
7.3
作者:
K. Wilson;D. Baldocchi;P. Hanson
通讯作者:
K. Wilson;D. Baldocchi;P. Hanson
DOI:
10.1080/00224065.1986.11978989
发表时间:
1975-03
期刊:
--
影响因子:
--
作者:
M. Kutner
通讯作者:
M. Kutner
影响因子:
7.3
作者:
B. Medlyn;D. Loustau;S. Delzon
通讯作者:
B. Medlyn;D. Loustau;S. Delzon