太湖地区稻田甲烷排放模拟的粒度效应研究  

SIZE EFFECT ON SIMULATION OF METHANE EMISSION FROM PADDY SOILS IN TAIHU LAKE REGION

作　　者：孙欣[1,2] 史学正[2] 潘剑君[1] 王洪杰[2] 

机构地区：[1]南京农业大学资源与环境科学学院,南京210095 [2]土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008

出　　处：《土壤学报》2010年第4期659-664,共6页Acta Pedologica Sinica

基　　金：国家自然科学基金创新群体项目(40621001);中国科学院知识创新工程领域前沿项目(ISSASIP0715)资助

摘　　要：利用DNDC(DeNitrification–DeComposition)模型,估算了由太湖地区1∶50000土壤数据库转换集成的1km、2km、4km、8km、16km、32km和64km七种栅格粒度下1982～2000年共19年的稻田CH4的排放总量,研究了稻田CH4排放总量随栅格粒度增加的变化特征。结果表明,太湖地区稻田19年的CH4排放总量在16km栅格粒度处有明显的转折点,表现为在1km至16km栅格粒度之间,稻田CH4排放总量的极差仅为0.27TgC,模拟结果变异很小;而在16km至32km和64km栅格粒度之间,由较大的栅格单元所引起的面积误差导致了稻田CH4排放总量的极差达到2.96TgC,模拟结果迅速增大。因此,综合考虑空间数据量和模型运算周期,基于1∶50000土壤数据库转换集成栅格数据模拟估算农田温室气体排放时,16km栅格粒度是最适宜的模拟粒度。With the aid of the DeNitrification - DeComposition （DNDC） model,the total CH4 emission from of paddy fields in the period from 1982 to 2000 in the Taihu Lake region, as was affected by grid size, was estimated and variation of the total emission with grid size characterized A total of 7 grid sizes,i, e. 1 km,2 km,4 kin,8 km,t6 km,32 km and 64 km, were designed, based on the 1 ： 50 000 soil database. Results showed that an apparent turning point was observed with the grid size of 16 km,and displayed as a limited range of the estimation of the total CH4 emission being only 0.27 Tg C and low variation of the simulation of grid sizes from 1 km to 16 km. However, the range of the estimation expanded to 2.96 Tg C due to errors in area calculation in grid sizes from 16 km to 64 kin,and the variation increased rapidly. Taking into account the amount of spatial data and computing cycle of the model, 16 km was the optimal grid size for estimating emission of greenhouse gas from the farmlands.

关 键 词：太湖地区 水稻土 栅格粒度 DNDC模型 CH4排放总量 

分 类 号：S126[农业科学—农业基础科学]