稻田环境植物多样性研究

 选择稻田灌溉水无工业废水污染的禹山坞和受工业废水污染的城北村两地进行稻田环境植物多样性调查。禹山坞稻田普遍使用化学除草剂，杂草种数明显少于城北村，水竹叶成为禹山坞稻田的优势种；城北村稻田未用除草剂及低洼积水环境保护了槐叶萍、满江红、轮藻和尖头丽藻等。禹山坞的畦畔植物种数显著高于城北村。城北村灌溉水质差有利于部分耐性植物蔓延形成优势种，如空心莲子草的强烈竞争，使部分竞争力弱的植物逐步消失，植物种数减少。两村的沟渠植物种类差异明显。

Plant Diversity Research in Rice Field Habitat

Plant diversity in rice field habitat was investigated between two villages at Yushanwu where ricefields were irrigated with spotless water, and at Chengbei where rice fields were irrigated with polluted water by industrial waste. Application of herbicides to paddy field at Yushanwu was widespread which resulted in less weedspecies than that at Chengbei. Murdannia triquetra became a major species in paddy field at Yushanwu. Salvinianatans and Niteua acuminata etc. have been protected because of less herbicides use and lowland environments inChengbei. The plant species of ridges in Yushanwu were more than those in Chengbei where the waste water tolerant plant Alternanthera philoxeroides has spread and became a troublesome weed species so that some plants thatfailed to compete with it have disappeared. Plant species in irrigation canals and ditches were different between twovillages, Spirogyra sp. developed in Yushanwu and Ceratophyllum demersum grew in Chengbei.