不同采伐方式对林地土壤养分的影响

The Influence of Different Cutting Method to the Soil Nutrients

对吉林省东部林区长白山系张广才岭南段西坡针阔混交林、落叶松林、阔叶混交林十几年来的不同采伐方式迹地的土壤理化性质进行了定位及不定位的外业调查和室内分析，研究结果表明不同采伐方式对林地土壤养分影响有明显的差异：有机质、全氮、水解氮含量，择伐迹地及保留带皆高于皆伐迹地；针阔混交林、落叶松人工林高于阔叶混交林；速效钾含量皆伐还地高于择伐迹地及保留带；速效钾磷含量针阔混交林变化无规律，阔叶混交林、落叶松人工林择伐迹地高于皆伐迹地；ｐＨ值针阔混交林、落叶松人工林皆伐迹地比择伐迹地保留带高，阔叶混交林择伐迹地比皆伐迹地ｐＨ值高，水解酸低；枯落层厚度择伐迹地高于皆伐迹地，同一林分，随着采伐后时间推移，速效磷、速效钾逐渐降低；有机质含量针阔混交林、落叶松人工林择伐迹地逐渐增加，皆伐迹地逐渐降低；阔叶混交林全部降低；针叶混交林、阔叶混交林ｐＨ值逐渐升高，水解酸逐渐降低，落叶松人工林水解酸逐渐升高，ｐＨ值逐渐降低。

Authors have been investgated and analyzed the Soil physicochemical characteristics in differentlogged areas of the coniferous and broad leaved mixed forest.the artificial Dahurian larch forest and the broadleaved mixed forest,which are located in the east forest reqion of Jilin province-South part of Zhang GuangcaiRidge of Changbai Mountain,The researching results revealed that the Soil nutriects in the different logged ar-eas have obvious differences. The organic matters.full nitrogen、hydrolysis nitrogen contents are higher in se-lect cutting areas than those in the clear cutting areas and higher in the coniferous and broad leaved mixed for-est and the artificial Dahurian larch forest than those in the broad leaved mixed forest;The quick resultspotassium contents are higher in clear cutting areas than in the select cutting areas and the reserve strips;Thequick resuIts potassium and phosphorics contents have no reqularity in the coniferous and broad leaved mixedforest,and are higher in the select cutting broad leaved mixed forest and the artifical Dahurian larch forestthan that those in the select cutting’s and the reserve strips,and are higher in the clear cutting’s.The litterthickness is higher in select cutting areas than in the clear cutting areas. In the same stand,along with the timechanges after logging,the quick results phosphorus and potassium are gradually reduced; Organic matter con-tents are gradually increased in the select cutting coniferous and broad leaved mixed forest and artificialDahurian larch forest,and gradually reduced in the clear cutting’s. But it’ s reduced in clear cutting and selectcutting broad leaved mixed forest;The PH-values are gradually increased in the coniferous and broad leavedmixed forest and the broad leaved mixed forest, and the hydrolysis acid is gradually reduced, pH-values isgradually reduced in the artificial Dahurian larch forest.