摘要
土壤条件对箭杆杨溃疡病的流行与抗病性及发病程度具有明显影响。40～60cm深层土壤中的速效P与病情指数是显著正相关,pH与病情指数呈负相关。树皮中全P含量与该层土壤速效P含量及感病指数均具有显著的正相关性。通径分析指出,该层土壤的速效P及其pH对病情指数产生正效应;而全N、速效K对病情指数产生负效应。它们的效应大小依次为:P>K>N>pH。
Soil condition affects the epidemic of Dothiorella gregaria Sacc. severely in that a positive correlation was found between the available phosphorus in 41~60cm depth of soil and disease index of the canker , while a negative correlation was found between pH of the soil layer and the disease index. Phosphorus content of the poplar bark was correlated positively with both the disease index and the available P in the soil layer. The available P and pH of the soil layer showed positive effect on the canker whereas the total nitrogen and the available potassium of the soil layer showed negative effect as revealed by path analysis. The order of effect is: P>K>N>pH .
出处
《西北林学院学报》
CSCD
1991年第2期55-61,共7页
Journal of Northwest Forestry University
基金
林业部七.五攻关项目(75-07-04-09-04)子课题
关键词
杨树
溃疡病
流行规律
土壤因素
Populus usbekistanica Kom. cv Afghauica
canker
epidemic
soil factor
