Abstract: For two successive years, a study was conducted on the rule of weed emergence in the summer and autumn on turfs of ponyfoot (Dichondra carolinensis) and bermudagrass (Cynodon dactylon) in the Nanjing area. The emergence dynamics of the 5 noxious weeds were analysed, as well as the soil surface temperature, and the meteorological data during the initial, peak, and final stages of the weeds’ growth. The result shows that the surface temperature strongly induces the weeds emergence which is negatively correlated with the surface evaporation and slightly affected by the air moisture, precipitation, and length of shunshine time. Path analysis indicates that the surface temperature and evaporation initiate the weed emergence indirectly rather than directly, while the interaction between the two most strongly affects the weed emergence. The interactions among the other factors yield rather slight effect.

Key words: Truf weeds, Emergence dynamics, Meteorological factors, Partial correlation analysis, Path analysis

摘要： 连续两年研究南京地区马蹄金(Dichondrarepens Forst.)和狗牙根(Cynodon dactylon (L.)Pers.)草坪杂草的出苗规律,统计分析5种草坪夏秋季恶性杂草的出苗动态,即始发期、高峰期、终发期时间及其出苗期的土壤温度。气象资料偏相关分析结果表明:地表0cm的温度为杂草出苗的主导因子,地表蒸发率与杂草出苗率呈显著负相关;空气湿度、降水、日照时数等因子与杂草出苗率的相关性不显著。通径分析结果表明:地表温度和地表蒸发率对杂草出苗的间接影响稍大于直接影响;地表温度及其蒸发率互作对杂草出苗产生的效应最大,其它因子之间的互作效应较小。

关键词: 草坪杂草, 出苗动态, 气象因子, 偏相关分析, 通径分析