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从本文开始将陆续报道BHC在稻田陆生生态系中的残留动态。 1983年以前,农民使用BHC防治水稻害虫,BHC对土壤的污染水平与施药量有关、施药后即能呈现污染高峰。1983年停用后土壤中BHC残留最已下降至1982年的67～74％,同时也未呈现污染高峰,1984年土壤中BHC又继续降至1983年的40％,可以认为BHC在稻田生态系中并非为“土壤高残留农药”。 萧山试验基地土壤中BHC各异构体百分数的变迁动态,平常是β>α>δ≈γ体,但施药期α体百分数递增,而δ体又比其它异构体降解缓慢。
From the beginning of this article will continue to report BHC terrestrial ecosystem in rice residue dynamics. Before 1983, farmers use BHC to control rice pests. The level of soil pollution caused by BHC is related to the amount of pesticide applied. After the pesticides are applied, pollution peaks can occur. The BHC residue in soils dropped to 67-74% of that in 1982 after it was decommissioned in 1983, and no pollution peak was observed at the same time. In 1984, the BHC in soils continued to fall to 40% of that in 1983. It can be considered that the BHC in paddy field ecosystem Is not a “high residual pesticide soil.” The dynamics of the percentages of BHC isomers in soils at Xiaoshan Experimental Station are usually β> α> δ≈γ, but the percentages of α in the soil are increasing while those of δ are slower than those of other isomers.