辽西天然油松林土壤碳氮分布规律

摘要

We analyzed the distribution patterns of soil organic carbon and total nitrogen in Vitex negundo-P.tabulaeformis ( YⅠ) , Lespedeza hedysaroides-P.tabulaeformis ( YⅡ) and Spiraea fritschiana-P.tabulaeformis ( YⅢ) , to provide basic data for exploring the soil carbon and nitrogen distribution pattern in natural P.tabulaeformis forests in China and provide ecological fragile edge area response to global climate change.The soil organic carbon and total nitrogen of these three for-ests all decreased with the increase of the profile depth, and the distribution characteristics of soil organic carbon and total nitrogen in the same profile depth within three forests were not the same.By the correlation analysis of the impact factors of surface soil organic carbon partial, soil properties, total nitrogen, carbon nitrogen ratio and soil organic carbon had signifi-cant positive correlation, however, bulk density and pH value had significantly negative correlation with the soil organic carbon.For vegetation cover, litter total nitrogen and litter carbon nitrogen ratio and soil organic carbon had significantly positive correlation, and the litter organic carbon had significant negative correlation.%为探索我国天然油松林土壤碳氮分布格局，研究生态脆弱边缘区对全球气候变化的响应。对辽宁西部医巫闾山3种油松林（荆条-油松林、胡枝子-油松林、华北绣线菊-油松林）土壤碳氮分布特征进行了综合分析。结果表明：土壤碳氮分布随着土壤剖面深度的增加而降低；而同一土壤剖面层次内3种林分土壤碳氮分布规律不尽相同；表层土壤全氮质量分数、碳氮比与土壤有机碳质量分数呈极显著的正相关关系，而土壤密度、pH值呈显著的负相关；地表枯落物全氮质量分数、碳氮比与土壤有机碳质量分数呈显著的正相关，枯落物有机碳质量分数则呈显著的负相关。