从时空异质性看东湖富营养化中原生动物的演替

On the protozoan succession from the viewpoint of temporal and spatial heterogeneity in eutrophic Donghu Lake

1993-0 8～ 1 994 -0 8,东湖原生动物年均丰度为 59,391 ind./ L,年均生物量为 1 .4 0 mg/ L。从 V站到 0站 ,随着营养水平 ( TSI)增加 ,数量 ( A)和生物量 ( B)显著增加 :Ln A=-58.32 3+1 6.50 3Ln TSI( n=5,r=0 .983,p=0 .0 0 3) ;Ln B=-1 6.84 0 +0 .2 56TSI( n=5,r=0 .996,p<0 .0 0 1 ) ,两者均表现出明显的空间异质性。同时 ,丰度的周年动态模式也发生了明显演替 ,原来的春季和秋季高峰演变为冬季高峰 ,营养水平越高 ,冬季高峰越明显 ,随营养水平增加形成的原生动物群落结构 -种类组成和现存量 -的空间格局与年代变化趋势一致。

The spatial heterogeneity of the standing crop of protozoa in Lake Donghu was observed during 1993 08\|1994 08.The annual mean abundance of protozoa was 59 391 ind./L,and the biomass was 1.40 mg/L.With the increase of the trophic levels( TSI ),there was an obvious increase both in abundance( A ) and biomass( B )of protozoa.The succession of the annual dynamic model of protozoan abundance was found,the higher the trophic level,the higher peak in winter.The horizontal spatial pattern of protozoan community structure had a same trend with long\|term changes caused by trophic levels in Donghu Lake.