field ecosystem meaning in Chinese

农田生态系统

A study on the biomass of rice field ecosystem during slack winter season in xiangtan suburb
湘潭市郊稻田生态系统冬闲期间植物群落的生物量的研究
Health and biodiversity of field ecosystem ; agricultural pollution control ; environmental quality and clean agricultural production . innocent treatment and utilization of rural disposals
农田生态系统健康与生物多样性；农业环境污染控制；产地环境质量与农业清洁生产；农村废弃物资源化利用与无害化处理。