黑斑蛙养殖模式对稻田土壤肥力、土壤酶活性的影响及其经济效益

对两种黑斑蛙养殖模式即黑斑蛙精养和稻蛙共生进行田间对比试验,旨在比较分析两种模式下的稻田土壤肥力、生物酶活性变化特征,并与水稻单作进行经济效益比较.试验结果表明,与黑斑蛙精养田相比,进行稻—蛙共生的稻田土壤全磷、全钾、碱解氮、速效钾均有所增加,增幅分别为87.5%、28.4%、10.0%、120.7%,而全氮、有效磷、有机质却低于精养田(p<0.05),分别减少了41.6%、66.7%、41.3%;但两种模式的C/N无明显差异.在土壤生物酶活方面,精养田土壤中的中性磷酸酶、脱氢酶和脲酶均明显高于稻蛙田(p<0.05),分别提高43.4%、65.9%、62.6%.水稻单作模式一般利润为1650元/公顷左右,而两种黑斑蛙养殖模式的经济效益显著高于水稻单作,其利润分别为297750、119250元/公顷,三者的产投比分别为1.99、1.60、1.18.从经济效益看,精养模式明显高于稻蛙共生模式,但从养殖管理和风险管控而言,稻蛙共生模式操作更为稳当,且经济效益较水稻单作仍较为可观,可在确保粮食安全前提下,有效提高农民生产积极性,实现保产增收、提质增效.

Effects of Breeding Models of Rana nigromaculata on Soil Fertility and Enzyme Activity in Paddy Field and Economic Benefit Analysis

A field comparative experiment was conducted on the intensive culture of Rana nigromaculata and rice frog symbiosis in order to compare and analyze the changes of soil fertility and enzyme activities in paddy fields under the two models, and to compare the economic benefits with that of rice monoculture.'Hie results showed that the total phosphorus .total potassium .alkali - hydrolyzed nitrogen and available potassium in rice - frog symbiotic paddy soil increased by 87.5%, 28.4%,10.0% and 120. 7%.respectively.compared with the intensive cultivation field of Rana nigromaculata, but the total nitrogen .available phosphorus and organic matter were lower than those of intensive culture of Rana nigromaculata (p < 0. 05 ).which decreased by 41. 6%,66. 7% and 41.3% respectively .however, there was no significant difference in C/N between the two models. In terms of soil bio-enzymatic activity, the neutral phosphatase.dehydrogena.se and urease in the intensive field were significantly higher than those in the rice - frog field (p < 0. 05 ).which increased by 43. 4%,65. 9% and 62. 6% respectively. The profit of rice monoculture was about 1650 yuan per hectare, while the economic benefit of two cultivation modes of Rana nigromaculata was significantly higher than that of rice monoculture. Their profit is 297 750 yuan per hectare and 119 250 yuan per hectare, respectively. The ratio of production to investment was 1.99 yuan. 1.60 yuan and 1.18 yuan per hectare. From the point of view of economic benefit .intensive breeding mode was obviously higher than rice frog symbiosis mode, but from the point of view of breeding management and risk control, rice frog symbiosis mode was more stable in operation .and its economic benefit was still considerable compared with rice monoculture. Under the premise of ensuring food security.it can effectively improve farmers’ production enthusiasm.achieve yield .income.quality and efficiency.