英语语法分析

Second, traditional agroecosystem is usually at N-Limitation and water-limitation.

第二，传统农业生态系统常处于氮约束和水约束状态。

It also introduces the structure, functions, regulation and application of agroecosystem.

介绍了农业生态系统的结构、功能、调控及理论应用。

Then potassium balance studies in agroecosystem are especially necessary for crop production.

农田生态系统钾平衡研究对作物生产有重要意义。