Modeling nitrogen cycling in studying farmland ecosystem has been an important tool and has been paid much attention.
农田生态系统中的氮循环是影响农业生产力的主要因素之一，同时也会对环境产生影响。
2
The modeling object is the food chain in grassland ecosystem which is a representative one.
该模型采用比较典型的草原生态系统中的食物链作为建模对象。
3
The main research progress in China and oversea on system analysis and modeling for rice, soybean, alfalfa and their main insect pest ecosystem is surveyed.