杭州西湖风景区外来杂草的调查研究

Study on alien weeds of the West-lake scenic spot in Hangzhou

通过野外调查和文献资料的整理分析,确定杭州西湖风景区有外来杂草56种,隶属于21科44属。对西湖风景区外来杂草的种类组成、来源、分布特点进行分析,结果表明:(1)种类较多的科是菊科、苋科、豆科;(2)原产地以来源于北美洲的最多;(3)容易入侵地表裸露较大的生境;(4)发生具有季节差异;(5)种类、分布上呈动态变化。并就外来杂草近二十至三十年的变化进行了讨论。

According to the field investigation and literature analyzing,there are 56 alien weeds belonging to 44 genera,21 families are identified and recorded in West-Lake scenic spot. The species composition, source,and the distribution characteristics are discussed in this paper. The results show that.. （1）Compositae,Amaranthaceae,Legumino- sac are the three main families; （2）most of the alien weeds originated from North America; （3）uncovered habitats such as wasteland trend to be invaded and settled more easily than others; （4）their occurrences have seasonal differences; （5）species and distribution have dynamic alteration. The changes of alien weeds in 20-30 years were also discussed.