Biodiversity and sustainability of the integrated rice-fish system in Hani terraces, Yunnan province, China

浮游生物 底栖区 环境科学 富营养化 生物多样性 水质 养鱼业 农业 单作 农学 生态学 水产养殖 渔业 生物 营养物
作者
Feifan Li,Jiancao Gao,Yue Xu,Zhijuan Nie,Jinghui Fang,Qunlan Zhou,Gangchun Xu,Nailin Shao,Dongpo Xu,Pao Xu,Mingyu Wang
出处
期刊:Aquaculture Reports [Elsevier BV]
卷期号:20: 100763-100763 被引量:27
标识
DOI:10.1016/j.aqrep.2021.100763
摘要

Agricultural nonpoint source pollution is a critical issue that causes eutrophication in water bodies, due to the application of fertilizers. The traditional rice-fish coculture systems may develop a novel sustainable agriculture. The present study was undertaken to understand the ecological mechanisms of integrated fish farming especially water chemistry, dynamics of plankton, and benthic populations and their community compositions. In the rice-fish coculture system (RF), the total nitrogen in the water was higher compared to the rice monoculture system (RM), but significantly lower than in conventional fertilized rice farming. Dissolved oxygen (DO) presented a significant "Month x Treatment" interaction (p < 0.05) with differences across sampling period (p < 0.05). Higher DO concentrations and lower ammonium nitrogen levels suggested better water quality. The dominant zoobenthos were Chironomus spp. and oligochaetes worms in RF, which indicated the mesotrophic water levels. The plankton biodiversity and soil benthic fauna were dynamic in the integrated farming. More plankton species in RF were discovered and could serve as natural feeds for fish. A complementary use of nitrogen (N) between rice and fish in RF results in low N fertilizer application and low N release into the environment. These findings provide unique insights into how water environment could be improved and how the integrated farming practice could balance the production and environmental contamination.
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