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将林带内有芦苇的鱼塘分别设置留苇 0 ,1/4,1/2 ,3/4和 1 0等 5种类型。在林带和芦苇的不同高度 (5种 )、不同时间分别测定了光照度、植物表面温度、气温、水温、风速和水中溶氧含量变化 ,发现林带与不同的留苇密度对鱼塘内环境均有明显的调节作用 ,并存在着明显的差异 ,导致鱼塘内的生物组成有差异 ;鱼塘内不同留苇密度的螃蟹产量差异明显 ,分别为 1/4(74 8 4 0kg/hm2 ) ,1/2 (70 8 0 3kg/hm2 ) ,3/4(6 10 6 5kg/hm2 ) ,1 0 (5 5 3 6 3kg/hm2 ) ,0(5 31 2 2kg/hm2 ) ;单只螃蟹的重量分别为 5 6 6 8g/只 ,5 5 35g/只 ,5 3 4 3g/只 ,5 2 39g/只 ,4 3 37g/只。留苇密度 1/4高产的原因有二 ,一是林苇调节了鱼塘内小环境 ,二是林苇鱼塘内增加了生物的多样性 ,增加了螃蟹饲料源
Five types of reed 0,1 / 4,1 / 2, 3/4 and 1 0 were set in the reed ponds. The changes of illumination, plant surface temperature, air temperature, water temperature, wind speed and dissolved oxygen in water were measured at different altitudes (5 kinds) and different times in forest zone and reed. The results showed that there were There were significant differences between the two groups in the biological composition of fish ponds. The differences in the yield of crabs with different residual densities in fish ponds were significant (1/4 (74 8 4 0 kg / hm2), 1 / 2 (70 8 0 3 kg / hm2), 3/4 (6 10 6 5 kg / hm2), 10 (5 536 3 kg / hm2), 0 Respectively, 5 6 6 8g / only, 5 35g / only, 5343g / only, 5239g / only and 4337g / only. There are two reasons for the one-fourth high yield of reed density. One is that Lin Wei regulated the small environment in fish ponds, the other was the increased biological diversity in Linyi fish ponds and the increase of crab feed sources