气象因子对南京市草坪冬季杂草发生规律的影响

2000-2002年对南京地区草坪冬季杂草的出苗进行连续观察研究,明确了草坪中4种主要冬季杂草的出苗动态.采用偏相关分析和通径分析,研究了杂草出苗与气象因子间的关系.偏相关分析结果表明,地表0 cm的土壤温度为杂草出苗的主导因子,地表蒸发率、空气湿度、降水、日照时数等因子与杂草出苗的相关性不显著.通径分析结果表明,地表温度和地表蒸发率对杂草的出苗以间接影响为主,而空气湿度、降水、日照时数对杂草的出苗 以直接影响为主.地表温度与地表蒸发率间的互作对杂草出苗产生的效应较大,其它因子之间的互作效应较小.

Effect of meteorological factors on emergence of winter turfweeds in Nanjing

A consecutive survey on the emergence of winter turfweeds in Nanjing was conducted from 2000 to 2002. The emergence dynamics of 4 major weed species were determined. Relationship between weed emergence and meteorological factors were analyzed by partial correlation analysis (PCA) and path analysis (PA). PCA results showed that soil temperature in 0 cm depth was the principal factor affecting the emergence of turf weeds, but soil evaporation, air humidity, rainfall and sunshine had no significant effects. PA results indicated that soil temperature and soil evaporation affected weed emergence in an indirect way, while air humidity, rainfall and sunshine gave a direct impact on the seedling emergence. The interaction between soil temperature and soil evaporation was higher compared with other interactions among meteorological factors.