摘要
为了解盐碱地稻渔复合系统运作机理,于2021年4月至9月对系统稻田、环沟、主沟的水体、土壤、稻蟹进行采样,同时测定氮、磷、钾的含量,应用截留率及物质流分析方法研究稻渔复合系统营养元素累积特征及运移。结果表明,该系统有效截留了营养元素,土壤累积营养元素能力弱,并释放了一些营养元素,土壤营养元素的累积效果呈现稻田>主沟>环沟;通过物质流分析,系统营养元素出入比和产投比较好,总氮主要被稻蟹利用,系统盈余总磷和全钾较多;系统截留营养元素效果好,稻蟹利用营养元素能力强,特别是对总氮利用能力突出,全钾在土壤有所贮存;系统有效净化了水体,输入的营养元素能满足稻蟹及其他生物生长需求。
To understand the operation mechanism of the rice and fishery complex system in the saline land,the water,soil,and rice crabs in the paddy fields,ring ditch,and main ditch of the system were sampled from April to September 2021 to determine the contents of nitrogen,phosphorus,and potassium,and the interception rate and material flow analysis methods were applied to study the accumulation characteristics and transport of nutrients in the rice and fishery complex system.The results showed that the system effectively intercepted nutrients,among which the soil accumulation capacity of the system was weak and released some nutrients,and the cumulative effect of soil nutrients showed rice field>main ditch>ring ditch;the material flow analysis showed that the nutrients of the system had a relatively good out-in ratio and output-input ratio,with total nitrogen being used mainly by rice crabs,and the system had a high surplus of total phosphorus and total potassium.It could be seen that the system intercepted nutrients effectively,the rice crabs were able to use the nutrients,especially the ability to use total nitrogen,and total potassium was also stored in the soil;the system effectively purified the water body,and the input nutrients could meet the growth demand of rice crabs and other organisms.
作者
周琼
石伟
邱小琮
杨涓
ZHOU Qiong;SHI Wei;QIU Xiao-cong;YANG Juan(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;School of Life Sciences,Ningxia University,Yinchuan 750021,China;Yinchuan Aquaculture Technology Promotion Service Center,Yinchuan 750001,China)
出处
《湖北农业科学》
2022年第24期49-52,共4页
Hubei Agricultural Sciences
基金
宁夏回族自治区重点研发计划项目(2020BBF02009)
宁夏高等学校一流学科建设(水利工程)项目(NXYLXK2021A03)。
关键词
稻渔
复合系统
营养元素
累积特征
运移
rice and fishery
complex system
nutrients
accumulation characteristics
transport
