【摘要】 对不同林龄油松人工林凋落物与土壤理化性质进行了测定分析。结果表明:油松人工林年凋落量与现存量随林龄增加均表现出递增趋势,30 a生油松林的年凋落量和23 a生油松林现存量分别达到4.236 t.hm-2和18.788 t.hm-2;枯枝落叶层主要营养元素储存量随着林龄的增加而增加;N、P、K的积累量分别为114.72～201.32、5.63～11.12、12.48～23.11 kg.hm-2;凋落物分解率呈波动式递增趋势,且与阔叶树混交比例密切相关;油松人工林林地土壤有机质、N含量、P含量、田间持水量随林龄增加呈波动式递增,而容重则呈递减趋势;年凋落量、现存量、分解率与土壤有机质、N、P、K的含量、pH、田间持水量呈正相关,与土壤容重呈负相关。更多还原

【Abstract】 Five stands of Pinus tabulaeformis plantation,a secondary forest in the Xiaolong Mountain of Gansu were investigated to study the impact of forest litter on soil physical and chemical properties.The results showed that annual litterfall and reserve of litter of P.tabulaeformis plantation fluctuatingly increased with ages,which had the maximal amount up to 4.236 t·hm-2 of 30 a P.tabulaeformis,18.788 t·hm-2 of 23 a P.tabulaeformis respectively.The content of main nutrients in forest floor increased with ages,the content of N ranged from 114.72 kg·hm-2 to 201.32 kg·hm-2,that of P from 5.63 kg·hm-2 to 11.12 kg·hm-2,that of K from 12.48 kg·hm-2 to 23.11 kg·hm-2.Litter decomposition rate increased with ages and correlated closely with broad leaf trees.The content of soil organic matter,soil total N,total P,field capacity was increased with ages,but bulk density was dicreased with ages.The soil factors of soil organic matter,total N,total P,total K,pH,field capacity showed positive correlation with annual litterfall,reserve of litter and decomposition rate,but contzary result could be found in soil bulk density.更多还原