目的 评价鄱阳湖南岸区草洲实行封洲禁牧措施后不同垦种方式的灭螺及经济效果.方法 在鄱阳湖区选择4块草洲采用不围垦种植方法,按机耕后种植、除草并机耕后种植及除草后直接种植等3种不同耕作方式,同时设立对照组,观察有螺草洲的螺情变化,并评价经济效果.结果 3种方式实施前,活螺密度分别为0.063只/0.11m2、0.070只/0.11m2和0.04只/0.11m2,对照组活螺密度为0.131只/0.11m2,实施后分别下降了88.25%、95.57、40.25%和35.88%.垦种前与垦种后,机耕组和除草加机耕组的有螺框出现率间的差异有统计学意义(χ2=11.021,13.798;P<0.05).3种方式实施后每亩的平均经济收益为12.5元、41.8元和-29.3元.结论 3种种植方式中,除草并机耕后种植方法 能够取得较好的灭螺及经济效果.%Objective To evaluate the effect of snail control and economic benefits from planting after marshland isolation and grazing prohibition in the south coast of Poyang Lake region. Methods Four marshlands in Poyang Lake were selected for planting with different reclaiming and cultivating ways, including planting sesame after weeding, planting sesame after ploughing, or planting sesame after either ploughing and weeding, and no planting as control group, and the change of snail situation and economic benefits were observed. Results The density of living snails was 0.063/0. llm2, 0.07/0. llm2 and 0.04/0. llm2 before planting sesame, respectively, and the density of living snail was 0.131/m2 in the control marshland. The density of living snails decreased by 88.25%, 95.57%, 40.25%, and 35.88%, respectively, in the four marshlands after planting sesame. The appearance rate of snail had significant difference (X2=ll.021,13.798; P<0.05) between group of planting sesame after ploughing and group of planting sesame after either ploughing and weeding. The mean income of three groups were 12.5 yuan, 41.8 yuan and -29.3 yuan, respectively. Conclusion Planting sesame after ploughing and weeding had a better effect on snail control and economic benefits compared to the other two planting manner.
展开▼
