%0 Journal Article
%T Simulating Net Primary Production of Agricultural Vegetation in China (Ⅱ): Model Validation and Estimation of Net Primary Production<br>中国农业植被净初级生产力模拟(Ⅱ)——模型的验证与净初级生产力估算
%A WANG Yu
%A HUANG Yao
%A ZHANG Wen
%A YU Yong-qiang
%A WANG Ping
%A <br>王彧
%A 黄耀
%A 张稳
%A 于永强
%A 王平
%J 自然资源学报
%D 2006
%I 
%X Models for simulating crop net primary production(NPP)have been developed well over the last three decades,while few of them are successfully put into practice in the agro-ecosystem of China.The objectives of this paper are to validate an existing model Crop-C developed by the authors,and to estimate crop NPP in China by employing Crop-C.Crop-C was validated against independent measurements from literature and the derived NPP from crop yields documented in national statistical yearbooks.Six crops of rice,wheat,maize,cotton,soybean and rapeseed,planted in approximately two thirds of agricultural soils in China,were involved in the validation.Model validation indicated that NPP of the six crops can be well simulated from weather,soil and N fertilization in various regions of China.A comparison between the simulated and the observed NPP resulted in a correlation coefficient(R2)of 0.80(n=786).By linking the Crop-C to GIS database,crop NPP in mainland China was estimated from 1980 to 2000.The GIS database includes soils,weather,N fertilization and some other related parameters that were interpolated or rasterized into grid layers.Model estimates indicated that the NPP increased from 472.9Tg C in 1980 to 607.2Tg C in 2000.Higher NPP occurred in eastern and southern China,and lower NPP appeared in most parts of northwestern and southwestern China.Nevertheless,NPP increased significantly in northern China and some parts of northwestern China from 1980 to 2000 as the consumption of synthetic fertilizer increased.It was concluded that Crop-C can reasonably simulate NPP for crops of rice,wheat,maize,cotton,soybean and rapeseed with common available datasets of climate,soil and nitrogen fertilizer application.NPP of agricultural vegetation in China could be estimated by coupling Crop-C to regional databases with a high spatial resolution.In addition,NPP of Chinese agricultural vegetation increased significantly from 1980 to 2000 according to the regional estimates.
%K crop
%K model
%K validation
%K GIS<br>作物
%K 模型
%K 验证
%K 地理信息系统
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=4DCB9A3AF3395AF0101DE5302EF3C300&aid=0EE89859556D3D16&yid=37904DC365DD7266&vid=659D3B06EBF534A7&iid=B31275AF3241DB2D&sid=DE4E739E935BD9A7&eid=F08C87DC7855E316&journal_id=1000-3037&journal_name=自然资源学报&referenced_num=1&reference_num=38