JOURNAL OF NATURAL RESOURCES ›› 2006, Vol. 21 ›› Issue (5): 790-801.doi: 10.11849/zrzyxb.2006.05.013

• Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS • Previous Articles     Next Articles

Simulating Net Primary Production of Agricultural Vegetation in China(Ⅰ):Model Establishment and Sensitivity Analysis

HUANG Yao1, WANG Yu2, ZHANG Wen1, YU Yong-qiang1, WANG Ping2   

  1. 1. LAPC,Institute of Atmospheric Physics,CAS,Beijing 100029,China;
    2. College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China
  • Received:2006-01-13 Revised:2006-04-03 Online:2006-10-25 Published:2006-10-25

Abstract: Plant net primary production(NPP) of agriculture vegetation represents the capacity of sequestrating atmospheric CO2 in agro-ecosystem,and plays an important role in terrestrial carbon cycling.In comparison with natural ecosystems of forest and grassland,agro-ecosystem is much complex due to human activities.To better understand the contribution of agro-ecosystem to regional carbon budget,the simulation models of crop NPP have been developed well since the 1970s.However,few models are successfully put into practice in the agro-ecosystem of China,being mainly due to the unavailability of model inputs and the verification of reliability in different regions of China.The objectives of this paper are to establish a crop NPP model that could be put into practice in the agro-ecosystem of China and to make sensitivity analysis of the model. In light of a preliminary model established by the authors that simulates NPP of rice and wheat crops,a model named as Crop-C was developed.Crop-C is dedicated to the simulation of NPP of those crops of rice,wheat,maize,cotton,rapeseed and soybean planted in approximately two-thirds of agricultural soils in China.The model includes two main functional modules:photosynthesis and respiration,and nitrogen transport within soil-plant system.The processes of photosynthesis and respiration are mainly driven by environmental variables of temperature,solar radiation,precipitation,atmospheric CO2 concentration and crop tissue nitrogen.The transportation of nitrogen within soil-plant system is determined by simulating the processes of crop nitrogen uptake,soil nitrogen mineralization and synthetic nitrogen release. Model sensitivity analysis suggests that the sensitive significance of Crop-C to input parameters is in descending order of temperature,PAR,atmospheric CO2 concentration,soil nitrogen concentration,rate of nitrogen application and precipitation when the input parameters vary at-10% and 10%,respectively.In addition,global warming would have a negative effect on NPP of agricultural vegetation in China based on the model sensitivity analysis.

Key words: agricultural vegetation, net primary production, simulation model, sensitivity analysis, carbon cycling, global warming