小兴安岭土壤化学性质对红松活立木树干腐朽的影响  

Effects of soil chemical properties on trunk decay of Korean pine standing trees in Xiao Xing'an Mountains,northeastern China

作　　者：孙天用[1] 王立海[2] 徐华东[1] 鲍震宇[1] 

机构地区：[1]东北林业大学工程技术学院 [2]东北林业大学森林作业与森林环境中心

出　　处：《北京林业大学学报》2014年第2期30-37,共8页Journal of Beijing Forestry University

基　　金：林业公益性行业科研专项(201104007)

摘　　要：为研究土壤化学性质与红松活立木腐朽之间的关系，选取了18株腐朽和9株健康的成熟龄红松活立木为试验样木，对每株样木距离地面40～50cm处的一个横截面用Resistograph阻抗仪进行检测，确定腐朽情况。从每株样木根部取土样200g，测定pH、有机质、全N、水解N、全P、速效P、全K和速效K含量8项指标。对土壤各项化学指标与活立木腐朽之间的关系进行相关分析。结果表明：成熟龄红松活立木腐朽程度与立地土壤有机质含量之间显著正相关（R2=0．615，P=0．007），与pH之间存在明显的非线性关系，pH5．58时腐朽程度最高，pH远离该值时腐朽程度降低。健康样木立地土壤中全N、水解N和速效P含量的整体水平显著高于腐朽样木立地土壤，可能是由于过高的N和P元素含量抑制了木腐菌的生长，使活立木不易腐朽。建立的最优多元线性回归方程包括土壤pH、有机质和全N含量3个自变量（R2=0．758，P〈0．01），相关程度较高，相关性极显著。In order to study the relationship between soil chemical properties and decay of Korean pine standing trees, an investigation was carried out in Dailing Forest District of Xiao Xing＇ an Mountains of northeastern China. Eighteen rotten and nine healthy mature Korean pine standing trees were chosen as sample trees. One transverse section of each sample tree about 40 - 50 cm above the ground was tested by Resistograph to determine its inner decay status. And soil of 200 g was obtained from root zones of each sample tree. Eight chemical indicators of soil including pH, organic matter, total N, hydrolyzed N, total P, available P, total K and available K contents were tested in soil analysis laboratory of Northeast Forestry University by chemical process. Relationship between standing tree trunk decay and the eight soil chemical indicators was analyzed using one-way analysis of variance and ordinary least square regression. The results indicated that decay degree of mature Korean pine standing trees had a significant positive correlation with organic matter content of soil （ R2 = 0. 615, P = 0. 007 ） , obvious non-linear correlation with pH of soil. Decay degree reached the maximum when pH equaled 5.58 and decreased when pH was far from this value. Total N, hydrolyzed N and available P contents of soil at the root zones of healthy standing trees were significantly higher than that of decayed standing trees because that an excess of N and P impeded the growth of wood decay fungi, and protected standing trees from being rotten. The optimal multi-variable linear regression equation included three soil indicators of pH, organic matter and total N contents （R2 = 0. 758, P〈〈0.01 ） , showing a high degree of correlation and extremely significant relevance.

关 键 词：红松活立木 树干腐朽 土壤化学性质 

分 类 号：S718.53[农业科学—林学] S791.247