稻蟹共生系统河蟹放养密度对水稻和河蟹的影响

The Effect of Stocking Density of Chinese Mitten Crab on Yields of Rice and Crab in Rice-crab Culture System

采用稻田陆基围隔方法,研究了成蟹放养密度对水稻产量、河蟹生长以及产量的影响,并对稻田放养不同密度的河蟹进行了经济效益分析。结果表明,河蟹的放养密度对稻田土壤化学指标影响不显著(P>0.05);河蟹的放养密度对河蟹的产量影响极显著(P<0.01);放养不同密度河蟹对水稻产量影响不显著(P>0.05);经济效益分析的结果表明,0.75只/m2稻田养蟹的净利润最高,而其他各组差异显著(P<0.05)。稻田养殖成蟹的最佳放养密度为0.75只/m2左右。

This paper aims to do a research, by the means of rice land-based enclosure method, on the stocking density of crab＇s effects on rice yield, growth and production of crabs, and do an economic benefit analysis about different stocking density of crab in paddy fields.The stocking density of crab was set by three kinds, that was, 0.45,0.75 and 1.05 inds per m2.The results showed： Chemical indexes of soil in the paddy field were not significantly affected by the stocking density of crabs （P〉0.05）; The yield of crabs was significantly affected by the stocking density （P〈0.01）; Different stocking densities had not an significant effect on rice yield （P〉0.05）; The size of 0.75 inds crab in each square meter for net profit was the highest while the other two had almost the same profit （P〈0.05）.These results showed that the optimal stocking density of crab in paddy fields was 0.75 inds crab in each square meter.