落叶松落叶病与林地土壤关系的研究

Study on Relationship between Larch Needle Cast and Forest Soil

通过对吉林省伊通县落叶松人工纯林落叶病病情与林地土壤关系调查发现:生长在白浆土类土壤上的落叶松纯林病情明显重于生长在暗棕壤土类土壤上的落叶松纯林。经两个土类A层(腐殖质层)、B层(淀积层)土壤理化性质分析测定及落叶松根际施肥试验表明:林分病情的轻重与林地A层(腐殖质层)、B层(淀积层)土壤氮、磷、钾营养元素的含量关系不显著,与B层(淀积层)土壤的吸湿水含量、pH值,容重等关系显著,而与A层腐殖质层的关系不显著。确定了林地B层(淀积层)土壤质地粘重、板结、透水透气性差及酸性增强是导致病情加重的重要因素。

Through investigation on relationship beween larch pure crop needle cast condition and forest soil in county Yitong of province Jilin, getting conclusion： pure crop needle cast condition growing on white betonies is more serious than growing on deeply brown soil. Showing through A and B level of two kinds of soil physically and chemically analysis and experiment of fertilizing from boot： needle cast condition is light or heavy is not totally according to relationship of N,P,K content of A and B level of soil, but according to relationship of observing water eontent,pH and hulk specific gravity. B level of forest soil is sticking,hardening, permeability is bad and acidic enhancement lead to needle cast condition more seriously.