基于China-DNDC模型和环境效益最优的猪当量和农田种养匹配算法及应用

Based on China-DNDC model and optimal environmental benefits pig equivalent and planting farmland matching algorithm and application

种养养分循环利用是我国绿色农业发展的关键路径,但以经验公式法估算农田作物对养殖粪尿的消纳量,会带来较大的不确定性。本研究建立了一种基于氮素生物地球化学循环和环境效益最优的方法计算养殖(猪当量)排放和种植农田匹配算法。通过开发网络版China-DNDC模型并建立相关数据库,以保证农田产量和环境负效益最低为目标函数,归纳出猪田比(每亩土地可消纳的猪当量值)的计算公式。在江苏盐城市大丰区上海农场的实际条件下,计算出适宜的猪田比为5∶1。这个结果可为当地合理布局种养结合农场,实现畜禽养殖资源化和生态化提供科学依据。

Nutrient recycling in farming culture is the key path for the development of green agriculture in China.However,estimating farmland crop’s consumption of manure and urine by empirical formula method may bring uncertainties.In this study,a matching algorithm based on the nitrogen biogeochemical cycle and the best environmental benefits was established to calculate the farming(pig equivalent)emissions and cropland.Through developing the network version of China-DNDC model and establishing relevant database to ensure the yield and the lowest environmental negative effects of the farmland,the formula for calculating the pig-field ratio(the equivalent value of pig per acre)was hence induced.Under the actual conditions of Shanghai branch farm of Dafeng Farm(Yancheng City,Jiangsu),the suitable pig-field ratio was 5∶1.This result can provide scientific basis for rational distribution for farming culture,and realizing the resource and treatment of livestock and poultry farming ecologically.