Chin J Plan Ecolo ›› 2015, Vol. 39 ›› Issue (4): 388-397.DOI: 10.17521/cjpe.2015.0038
Special Issue: 碳水能量通量
• Orginal Article • Previous Articles Next Articles
LIU Cheng1,*(), HUANG Jian-Ping1,**(), DIAO Yi-Wei1, WEN Xue-Fa2, XIAO Wei1, ZHANG Mi1, LEE Xu-Hui1, LIU Shou-Dong1
Received:
2014-09-04
Accepted:
2015-01-10
Online:
2015-04-01
Published:
2015-04-21
Contact:
Cheng LIU,Jian-Ping HUANG
About author:
# Co-first authors
LIU Cheng,HUANG Jian-Ping,DIAO Yi-Wei,WEN Xue-Fa,XIAO Wei,ZHANG Mi,LEE Xu-Hui,LIU Shou-Dong. Optimization and evaluation of vegetation photosynthesis and respiration model using the measurements collected from the forest site of subtropical coniferous-evergreen[J]. Chin J Plan Ecolo, 2015, 39(4): 388-397.
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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2015.0038
Fig. 1 Schematic diagram of the vegetation photosynthesis respiration model (VPRM). EVI, enhanced vegetation index; GEE, gross ecosystem CO2 exchange; LSWI, land surface water index; NEE, net ecosystem CO2 exchange; PAR, photosynthetically active radiation; R, respiration; T, temperature.
方案 Scheme | λ | PAR0 (μmol·m-2·s-1) | α (μmol CO2·m-2·s-1·℃-1) | β (μmol CO2·m-2·s-1) |
---|---|---|---|---|
1 | 0.048 | 514 | 0.164 | 0.906 |
2 | 0.203 | 345 | 0.164 | 0.906 |
Table 1 A comparison of the parameters derived from two schemes at Qianyanzhou site
方案 Scheme | λ | PAR0 (μmol·m-2·s-1) | α (μmol CO2·m-2·s-1·℃-1) | β (μmol CO2·m-2·s-1) |
---|---|---|---|---|
1 | 0.048 | 514 | 0.164 | 0.906 |
2 | 0.203 | 345 | 0.164 | 0.906 |
Fig. 2 A comparison of VPRM-simulated net ecosystem CO2 exchange (NEE-VPRM) with observed NEE (NEE-Obs) for year 2012 at Qianyanzhou site. +, simulated NEE with optimized parameters of scheme 1; ·, simulated NEE with optimized parameters of scheme 2; Solid black line, 1:1 line.
2012年 Year 2012 | 斜率 Slope | 截距 Intercept (μmol·m-2·s-1) | R平方值 R square | 均方根误差 Root mean squared error (μmol·m-2·s-1) | 平均误差 Mean bias (μmol·m-2·s-1) | 有效数据 Valid data | |
---|---|---|---|---|---|---|---|
方案一 Scheme 1 | 全年0.5 h NEE All year 0.5 h NEE | 0.17 | 2.44 | 0.51 | 9.58 | 6.68 | 5 909 |
生长旺季时刻平均 Mean diurnal variation during the peak growing season | 0.27 | 3.49 | 0.97 | 8.01 | 5.63 | 48 | |
非生长旺季时刻平均 Mean diurnal variation during the non-peak growing season | 0.06 | 1.78 | 0.61 | 4.12 | 2.24 | 48 | |
方案二 Scheme 2 | 全年0.5 h NEE All year 0.5 h NEE | 0.73 | -2.23 | 0.52 | 6.23 | -0.86 | 5 909 |
生长旺季时刻平均 Mean diurnal variation during the peak growing season | 0.92 | 0.65 | 0.96 | 1.72 | 0.87 | 48 | |
非生长旺季时刻平均 Mean diurnal variation during the non-peak growing season | 0.50 | 0.66 | 0.89 | 2.15 | 0.91 | 48 |
Table 2 Statistical analysis between simulated net ecosystem CO2 exchange (NEE) and observed NEE
2012年 Year 2012 | 斜率 Slope | 截距 Intercept (μmol·m-2·s-1) | R平方值 R square | 均方根误差 Root mean squared error (μmol·m-2·s-1) | 平均误差 Mean bias (μmol·m-2·s-1) | 有效数据 Valid data | |
---|---|---|---|---|---|---|---|
方案一 Scheme 1 | 全年0.5 h NEE All year 0.5 h NEE | 0.17 | 2.44 | 0.51 | 9.58 | 6.68 | 5 909 |
生长旺季时刻平均 Mean diurnal variation during the peak growing season | 0.27 | 3.49 | 0.97 | 8.01 | 5.63 | 48 | |
非生长旺季时刻平均 Mean diurnal variation during the non-peak growing season | 0.06 | 1.78 | 0.61 | 4.12 | 2.24 | 48 | |
方案二 Scheme 2 | 全年0.5 h NEE All year 0.5 h NEE | 0.73 | -2.23 | 0.52 | 6.23 | -0.86 | 5 909 |
生长旺季时刻平均 Mean diurnal variation during the peak growing season | 0.92 | 0.65 | 0.96 | 1.72 | 0.87 | 48 | |
非生长旺季时刻平均 Mean diurnal variation during the non-peak growing season | 0.50 | 0.66 | 0.89 | 2.15 | 0.91 | 48 |
Fig. 3 A comparison between the observed and modeled mean diurnal variation of net ecosystem CO2 exchange (NEE) during the peak growing season (April to September) of 2012 at Qianyanzhou site. NEE-Obs, observed NEE; NEE-Mod, simulated NEE with optimized parameters of scheme 2.
Fig. 4 Regression analyses between the VPRM modeled net ecosystem CO2 exchange (NEE-VPRM) and observed NEE (NEE-Obs) during growing season (April to September) in year 2012 at Qianyanzhou site. Black circle: simulated NEE with optimized parameters of scheme 2; dotted line: 1:1 line.
Fig. 5 A comparison between the observed and modeled mean diurnal variation of net ecosystem CO2 exchange (NEE) during the non-peak growing season of 2012 at Qianyanzhou site. NEE-Obs, observed NEE; NEE-Mod, simulated NEE with optimized parameters of scheme 2.
Fig. 6 A comparison of simulated net ecosystem CO2 exchange (NEE) with observations at Qianyanzhou site during the day 184-190 of 2012 (sunny). NEE-Obs, observed NEE; NEE-Mod, simulated NEE with optimized parameters of scheme 2; GEE-Mod, simulated gross ecosystem CO2 exchange with optimized parameters of scheme 2; R-Mod,simulated respiration with optimized parameters of scheme 2.
Fig. 7 A comparison of simulated net ecosystem CO2 exchange (NEE) with observations at Qianyanzhou site during the day 152-158 of 2012 (cloudy). NEE-Obs, observed NEE; NEE-Mod, simulated NEE with optimized parameters of scheme 2; GEE-Mod, simulated gross ecosystem CO2 exchange with optimized parameters of scheme 2; R-Mod,simulated respiration with optimized parameters of scheme 2.
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