浙江天童森林砍伐对土壤养分库和氮矿化-硝化特征的影响  

Effects of clear-felling on soil nutrient pools and nitrogen mineralization and nitrification in Tiantong,Zhejiang Province

作　　者：李光耀[1,2] 杨晓东[2,3] 史青茹[2,3] 马文济[2,3] 王希华[2,3] 阎恩荣[2,3] 

机构地区：[1]皖西学院资源环境与旅游管理学院,安徽六安237012 [2]华东师范大学环境科学系,上海200241 [3]浙江天童森林生态系统国家野外科学观测研究站,浙江宁波315114

出　　处：《生态学杂志》2014年第3期709-715,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31270475和31070383);安徽高校省级自然科学研究重点项目(KJ2013A263)资助

摘　　要：揭示不同砍伐频率对森林土壤养分库和氮周转的影响,对于理解森林养分循环的干扰响应具有重要意义。本研究以浙江天童常绿阔叶林为对象,选择了3个具有不同砍伐频率的群落比对组,分析各组内土壤有机碳和氮磷养分库,以及氮素矿化、硝化速率的变化。结果表明:3组群落中,重复砍伐群落的土壤总氮和总有机碳储量显著减小(P<0.05),而土壤总磷、铵态氮和硝态氮储量、土壤容重显著增加(P<0.05)。土壤氨化速率和氮矿化速率在比对组间无显著差异(P>0.05),但硝化速率在重复砍伐后显著增加(P<0.05)。本研究表明,土壤养分库和氮转化对森林重复砍伐的响应方式不同。森林重复砍伐后,土壤有机碳库和氮库含量降低,磷库和无机氮库含量增加,氮素矿化和氨化速率变化不显著,硝化速率显著提高。Revealing the effects of forest clear-felling frequencies on soil nutrient pools and nitro- gen transformation is important for understanding the response of nutrient cycling to clear-felling. In this study, three pairs of control and clear-felling （ at different frequencies） communities were selected in evergreen broad-leaved forests in Tiantong, Zhejiang Province, to study the influence of clear felling on soil organic carbon, nitrogen and phosphorus pools, as well as soil nitrogen mineralization and nitrification. The results showed that repeated clear felling significantly low- ered the stocks of soil total nitrogen and organic carbon （P〈0.05） , while significantly increased soil phosphorus, ammonium and nitrate contents, and soil bulk density （P〈0.05）. Repeated clear felling did not cause significant changes in soil nitrogen mineralization and ammonification rates （P〉0.05）, but significantly increased the soil nitrogen nitrification rate （P〈0.05）.

关 键 词：森林砍伐 土壤有机碳库 土壤氮库 土壤磷库 氮转化 常绿阔叶林 

分 类 号：S154.1[农业科学—土壤学]