AgroecosystemsCOCA¹³⁵⁹²⁴BNC¹⁴⁴⁶⁶⁴⁺³ 基本例句 农业生态系统¹⁰⁰原型agroecosystem的三单 The sustainable fertility index SFI in different agroecosystems was discussed by integrating soil nutrients and biological indices. 运用土壤生物和养分指标讨论了不同农田土壤肥力可持续性指数。 cnki Compared with the natural ecosystems, agroecosystems possess their own special characteristics. 与自然生态系统相比，农业生态系统具有自己的独特性质。 cnki