捕食线虫真菌在北京地区果园中的季节性分布(英文)

NOTES ON THE SEASONAL FLUCTUATION OF THE NEMATODE-TRAPPING FUNGI POPULATION IN ORCHARDS AT THE VICINITY OF BEIJING

通过对北京海淀区2个苹果园和2个葡萄园根际捕食线虫真菌2年的季节性变化调查,共分离到199个捕食线虫真菌菌株,隶属3个属16个种,Arthrobotrysdactyloides分离频率最高,其次是A.oligospora,A.conoides和Stylopagesp.。捕食线虫真菌的数量在晚春夏初最丰富,秋季次之,冬夏最少。通过统计分析,捕食线虫真菌数量的季节性变化与温度线性相关,而与线虫总数S形相关,与土壤湿度和植物寄生线虫数量无显著相关。

Seasonal distribution of nematode-trapping fungi in 2 apple and 2 grape orchards in the vicinity of Beijing was investigated from April 1990 to April 1992. 199 fungal strain, belonging to 3 genera and 16 species, were isolated. Arthrobotrys dactyloides was the predominant species in all four orchards, and A. oligospora, A. conoides and Stylopage sp. were frequently encountered. The fungi were abundant in late spring and early summer and slightly so in the autumn. A SAS stepwise regression between the seasonal fluctuation of nematode-trapping fungi and soil moisture, soil temperature and the density of total nematodes as well as styled nematodes indicated that soil temperature was positively correlated with the number of nematode-trapping fungi in a linear tendency while the density of total nematodes was correlated with nematode-trapping fungi in a sigmoid state