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在水稻的返青期、分蘖期、拔节期、扬花期和灌浆期,对稻蟹共作水环境的浮游甲壳动物群落进行研究。本实验设置了4个处理:单株/穴养蟹田(T1),双株/穴养蟹田(T2),四株/穴养蟹田(T4)和双株/穴不养蟹田(CK)。各处理均设3个平行。通过收集和分析实验田的浮游甲壳动物,经鉴定:枝角类有13种、桡足类有5种,共18种,其中4种为优势种。枝角类平均密度呈现先升高后下降趋势,分蘖期升至峰值,不养蟹田灌浆期下降至较低水平,养蟹田扬花期下降至较低水平随后上升但上升幅度不大,返青期和分蘖期各处理之间无显著差异(P>0.05),而拔节期、扬花期和灌浆期养蟹田和不养蟹田之间差异极显著(P<0.01)。桡足类平均密度总体呈上升趋势,返青期平均密度极低,仅为0.48 ind/L,平均生物量变化趋势与密度变化趋势基本相同。水稻的不同栽培模式对浮游甲壳动物有一定的影响。从生产的角度分析T1的栽培模式综合收益最大,因此,T1更有益于稻蟹共作生态系统。
In the greening, tillering, jointing, flowering and filling stages of rice, the community of plankton crustaceans in water environment was studied. In this experiment, four treatments were set up: T1, T2, T4 and T4 / CK. Each treatment is set to 3 parallel. By collecting and analyzing the plankton crustaceans in the experimental field, 13 species of cladocerans and 5 species of copepods were identified, of which 18 species were dominant, of which 4 species were the dominant species. The average densities of cladocera increased firstly and then decreased, reached the peak at tillering stage, decreased to a lower level at the tillering stage, decreased to a lower level at the flowering stage and then increased but did not increase much at the tillering stage There was no significant difference between treatments (P> 0.05) at tillering stage, but at jointing stage, flowering stage and filling stage, there was significant difference (P <0.01). The average density of copepods generally showed an upward trend, and the average density of turning green was extremely low, only 0.48 ind / L. The trend of average biomass and density was basically the same. Different cultivation modes of rice have certain influence on plankton crustaceans. From the production point of view of T1 cultivation mode of comprehensive income is the largest, therefore, T1 is more beneficial to rice crab ecosystem.