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通过1987—1990年在无锡、如东、如皋3个市县的现场实验和河沟钉螺调查。发现低密度钉螺的消长与环境因子密切有关,只要环境适宜,即使留下1对钉螺,也能大量繁殖增长。实验沟放置有1、5和10对钉螺的螺笼经3年后,钉螺密度各增长了171.9倍、69.5倍和28.4倍。其螺口数分别增长了354倍、135倍和75倍,其中2条积水沟的1对钉螺组螺口数增长543和426.5倍。在现场1条水沟钉螺密度增长了34倍,1条河钉螺密度没有增长,但都没有自然消亡。提示当“基本消灭”或“消灭”以后,应重视低密度钉螺的清查,坚持长期监测,一旦发现钉螺,要及时杀灭。
Through field experiments and snail snail surveys in three cities and counties in Wuxi, Rudong and Rugao in 1987-1990. It was found that the growth and development of low-density snails are closely related to environmental factors. As long as the environment is suitable, even if a pair of snails are left, they can also multiply in large numbers. After 3 years, the density of snails increased by 171.9 times, 69.5 times and 28.4 times respectively in experimental ditch with 1,5 and 10 pairs of snails. The number of screw holes increased by 354 times, 135 times and 75 times, respectively, of which the screw holes of one pair of snails in two of the water gutters increased 543 and 426.5 times. In the field a ditch snail density increased 34 times, a river snail density did not increase, but did not die out. Prompt when “basically eliminate” or “eliminate” after, should pay attention to low-density snails inventory, adhere to long-term monitoring, once found snails, to kill in time.