Coupling of Phosphorus Processes With Carbon and Nitrogen Cycles in the Dynamic Land Ecosystem Model: Model Structure, Parameterization, and Evaluation in Tropical Forests

被引:17
作者
Wang, Zhuonan [1 ,2 ]
Tian, Hanqin [1 ,2 ]
Yang, Jia [3 ]
Shi, Hao [1 ,2 ,4 ]
Pan, Shufen [1 ,2 ]
Yao, Yuanzhi [1 ,2 ]
Banger, Kamaljit [5 ]
Yang, Qichun [6 ]
机构
[1] Auburn Univ, Int Ctr Climate & Global Change Res, Auburn, AL 36849 USA
[2] Auburn Univ, Sch Forestry & Wildlife Sci, Auburn, AL 36849 USA
[3] Mississippi State Univ, Coll Forest Resources, Mississippi State, MS 39762 USA
[4] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing, Peoples R China
[5] Univ Guelph, Plant Agr, Guelph, ON, Canada
[6] Univ Melbourne, Dept Infrastruct Engn, Melbourne, Vic, Australia
基金
美国国家科学基金会;
关键词
phosphorus cycle; Earth System Model; phosphorus limitation; biogeochemistry; terrestrial ecology; NET PRIMARY PRODUCTION; SOIL ORGANIC-MATTER; PHOTOSYNTHETIC CAPACITY; NUTRIENT LIMITATION; PLANT-GROWTH; RAIN-FOREST; PART; CLIMATE; AVAILABILITY; PRODUCTIVITY;
D O I
10.1029/2020MS002123
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The biogeochemical processes of carbon (C), nitrogen (N), and phosphorous (P) are fully coupled in the Earth system, which shape the structure, functioning, and dynamics of terrestrial ecosystems. However, the representation of P cycle in terrestrial biosphere models (TBMs) is still in an early stage. Here we incorporated P processes and C-N-P interactions into the C-N coupled Dynamic Land Ecosystem Model (DLEM-CNP), which had a major feature of the ability in simulating the N and P colimitation on vegetation C assimilation. DLEM-CNP was intensively calibrated and validated against daily or annual observations from four eddy covariance flux sites, two Hawaiian sites along a chronosequence of soils, and other 13 tropical forest sites. The results indicate that DLEM-CNP significantly improved simulations of forest gross and net primary production (R-2: 0.36-0.97, RMSE:1.1-1.49 g C m(-2) year(-1) for daily GPP at eddy covariance flux sites; R-2 = 0.92, RMSE = 176.7 g C m(-2) year(-1) for annual NPP across 13 tropical forest sites). The simulations were also consistent with field observations in terms of biomass, leaf N:P ratio and plant response to fertilizer addition. A sensitivity analysis suggests that simulated results are reasonably robust against uncertainties in model parameter estimates and the model was very sensitive to parameters of P uptake. These results suggest that incorporating P processes and N-P interaction into terrestrial biosphere models is of critical importance for accurately estimating C dynamics in tropical forests, particularly those P-limited ones.
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页数:23
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