CAJ | 학술논문

分析了单作茭白(CK)、茭白田放养鸭20只·667 m-2(D20)、25只·667 m-2(D25)、30只·667 m-2(D30)等不同共作系统中氮素输入、输出与盈余(盈余=输入-输出),以及经济效益情况.结果表明:茭白-鸭共作系统中茭白平均产量为1 332.41 kg·667 m-2,比单作茭白增产26.31%.单作茭白总氮输入为22.27 kg N·667 m-2,其中化肥氮输入占到89.10%,产品氮输出为5.00 kg N·667 m-2,占总氮输入的22.45%,氮盈余为17.27 kg N·667 m-2,占总氮输入的77.55%,土壤氮残留为7.11 kg N·667 m-2,损失为10.16 kg N· 667 m-2;茭白-鸭共作系统总氮输入平均为23.72 kg N·667 m-2,其中化肥氮输入占65.13%,产品氮输出平均为7.65 kg N·667 m-2,占总氮输入的32.24%,氮盈余平均为16.07 kg N·667 m-2,占总氮输入的67.76%,土壤氮残留为7.18 kg N·667 m-2,损失为8.89 kg N· 667 m-2.茭白-鸭共作系统投入成本平均为3 114元·667 m-2,比单作茭白高84.59%,主要是鸭饲料、围网、鸭舍等成本增加.茭白-鸭共作系统产品产值平均为6 568元·667 m-2,比单作茭白高55.64%.D25处理经济效益(经济效益=产品产值-投入成本)最高为3 589元·667 m-2,比CK处理高41.69%.综合考虑氮平衡和经济效益,本试验条件下,茭白田放养鸭25只·667 m-2的共作系统的经济效益较高,并且氮素盈余和损失较少,可降低对环境的污染风险.
분석료단작교백(CK)、교백전방양압20지·667 m-2(D20)、25지·667 m-2(D25)、30지·667 m-2(D30)등불동공작계통중담소수입、수출여영여(영여=수입-수출),이급경제효익정황.결과표명:교백-압공작계통중교백평균산량위1 332.41 kg·667 m-2,비단작교백증산26.31%.단작교백총담수입위22.27 kg N·667 m-2,기중화비담수입점도89.10%,산품담수출위5.00 kg N·667 m-2,점총담수입적22.45%,담영여위17.27 kg N·667 m-2,점총담수입적77.55%,토양담잔류위7.11 kg N·667 m-2,손실위10.16 kg N· 667 m-2;교백-압공작계통총담수입평균위23.72 kg N·667 m-2,기중화비담수입점65.13%,산품담수출평균위7.65 kg N·667 m-2,점총담수입적32.24%,담영여평균위16.07 kg N·667 m-2,점총담수입적67.76%,토양담잔류위7.18 kg N·667 m-2,손실위8.89 kg N· 667 m-2.교백-압공작계통투입성본평균위3 114원·667 m-2,비단작교백고84.59%,주요시압사료、위망、압사등성본증가.교백-압공작계통산품산치평균위6 568원·667 m-2,비단작교백고55.64%.D25처리경제효익(경제효익=산품산치-투입성본)최고위3 589원·667 m-2,비CK처리고41.69%.종합고필담평형화경제효익,본시험조건하,교백전방양압25지·667 m-2적공작계통적경제효익교고,병차담소영여화손실교소,가강저대배경적오염풍험.
Nitrogen(N)input, N output, N surplus(N surplus=N input-N output), and economic benefit under different ecological systems were analyzed, including Zizania latifolia monoculture ecosystem and three Zizania latifolia-duck mutual ecosystems such as with 20 ducks per 667 m2(D20), 25 ducks per 667 m2(D25)and 30 ducks per 667 m2(D30). The results showed that the average yield of Zizania latifolia for three mutual ecosystems was 1 332.41 kg·667 m-2, 26.31%higher than that for monoculture ecosystem. For Zizania latifolia monoculture ecosystem, total N input was 22.27 kg N·667 m-2, and chemical fertilizer N was accounted for 89.10%, the N output by the harvest was 5.00 kg N·667 m-2, 22.45%of total N input, N surplus was 17.27 kg N·667 m-2, 77.55%of total N input. For three mutual ecosystems, the average total N input was 23.72 kg N·667 m-2, and chemical fertilizer N was accounted for 65.13%, the average N output by the harvest of Zizania lat-ifolia and duck mutual ecosystem was 7.65 kg N·667 m-2, 32.24%of total N input, the average N surplus was 16.07 kg N·667 m-2, 67.76%of total N input. Because of the costs of duck feed, fence and duck shed, the average input cost for three Zizania latifolia-duck mutual ecosys-tems was 3 114 yuan·667 m-2, 84.59%higher than that for Zizania latifolia monoculture ecosystem. The average economic income for three Zizania latifolia-duck mutual ecosystems was 6 568 yuan·667 m-2, 55.64%higher than that for Zizania latifolia monoculture ecosystem. For D25 treatment, the economic benefit (economic benefit=economic income-input cost)was the highest as 3 589 yuan·667 m-2, 41.69%higher than that for Zizania latifolia monoculture ecosystem. In view of N balance and economic benefit, Zizania latifolia-duck mutual e-cosystem with 25 ducks per 667 m2 had lower N surplus with less environmental risk, and higher economic benefit.