田园杂草群落，包括群落内各种群，会受各种条件及农业措施的影响。因而在同一地域的田园中，杂草群体不仅会因一年中季节的变化而表现出一定的动态。杭州市稻田杂草有30多种，分布较广且难以防除的恶性杂草仅数种。要有效地防除恶性杂草，必须对其种群动态有正确的认识。为此 Pastoral weed communities, including the various groups in the community, are subject to various conditions and agricultural practices. Thus in the same area of ​​the pastoral, weed population will not only show a certain dynamic due to the seasonal changes in the year. There are more than 30 species of weeds in rice fields in Hangzhou City, with only a few species of widely distributed and difficult to control malignant weeds. To effectively control the weeds, we must have a correct understanding of their population dynamics. to this end