【摘要】 文章对辽宁东部地区油松落针病的发生与土壤条件的关系进行了研究分析,结果表明:在7个县的油松发病林分内共有4种森林土壤类型,分别为石质棕色森林土、暗棕色森林土、草甸棕色森林土、生草棕色森林土。石质棕色森林土类型发病率(86.34%)和发病指数(50.01)最高。土壤肥力测定显示共同规律是随着土壤中速效氮、速效磷、钙和镁含量的减少而油松落针病均呈现病情加重的趋势,速效氮含量比正常下降了87.73%,表现最明显。发病林分的土壤pH值皆呈弱酸性,林分病情随着土壤的pH值减小而加重。更多还原

【Abstract】 Relationships of Lophodermium conigenum of Pinus tabulaeformis and soil conditions in eastern Liaoning were studied and analyzed in this paper.The results indicated that: There were 4 types(mainly stony brown forest soil,darkbrown forest soil,meadow brown forest soil and no-rotten weed brown forest soil) of forest soils in stands which Lophodermium conigenum occurred in 7 counties. The highest pathogenic rates and indices were for stony brown forest soil,which were 86.34% and 50.01 respectively;the results of soil fertility determination showed a common regularity,namely,available N,P,Ca and Mg contents decreased progressively as Lophodermium conigenum aggravated,and available N decreased significantly by 87.73% compared with the normal values in soil;the pH values in soils of stands with serious diseases showed weak acid levels,the situations of Lophodermium conigenum aggravated as pH decreased.更多还原