改变碳源输入对针阔叶混交林土壤氮矿化的影响  

Effects of controlling carbon input on nitrogen mineralization in soils of broadleaved-needle mixed forest plantation

作　　者：李茂金[1] 闫文德[1,2] 李树战[1] 赵大勇[1] 多祎帆[1] 

机构地区：[1]中南林业科技大学,湖南长沙410004 [2]南方林业生态应用技术国家工程实验室,湖南长沙410004

出　　处：《中南林业科技大学学报》2012年第5期108-112,共5页Journal of Central South University of Forestry & Technology

基　　金："十二五"农村领域国家科技计划课题(2011BAD38B0204);教育部新世纪优秀人才支持计划(NCET-10-0151);湖南省科技厅项目(2010TP4011-3);湖南省教育厅项目(湘财教字[2010]70号);长沙市科技局项目(K1003009-61);中南林业科技大学校青年基金(QJ2010029B)

摘　　要：为了解不同碳输入对混交林土壤中有效氮含量及氮矿化速率的影响,采用树脂芯原位测定法对马尾松+樟树混交林不同处理(添加凋落物、去除凋落物、去根、去根添加凋落物、去根去除凋落物)下的土壤氮矿化进行研究。结果表明:5种处理下土壤累计净氮矿化量为添加凋落物(12.10 mg/kg)>去根添加凋落物(6.03 mg/kg)>去根(0.96 mg/kg)>去除凋落物(-0.46 mg/kg)>去根去除凋落(-0.63 mg/kg);NH4+-N、NO3--N含量在培养前后均发生了显著变化;培养后,NH4+-N含量在添加凋落物、去除凋落物、去根、去根去除凋落物4种处理之间差异显著(P<0.05);各处理之间NO3--N含量差异显著(P<0.05)。研究结果为揭示亚热带森林生态系统氮循环机理提供科学依据。In order to understand the available nitrogen content and nitrogen mineralization rates under different carbon inputs in the soils of mixed forest, the nitrogen mineralization in the soils of mixed forest of Pinus massoniana and Cinnamomum camphora was measured under different treatments （extra litter addition with root （LAR）, litter removal with root （LRR）, control without root （CNR）, extra litter addition without root （LANR）, litter removal without root （LRNR） by using a resin-core technique. The results show that after incubation the contents of NH4＋-N and NO3--N were significantly changed. The differences in content of NH4＋-N were found under 4 different treatments （LAR, LRR, CNR, LRNR）. The significant differences were found in content of NO3--N. Under 5 different conditions （CR, LAR, LRR, CNR, LANR, LRNR）, the net nitrogen mineralization contents of 5 different treatment were extra litter addition with root （12.10 mg/kg）〉extra litter addition without root （6.03 mg/kg）〉control without root （0.96 mg/kg）〉litter removal with root （-0.46 mg/kg）〉litter removal without root （-0.63 mg/kg）. The researching results provide a scientific method for revealing circulation mechanism of nitrogen in subtropical forest ecological system.

关 键 词：针阔叶混交林 凋落物 氮矿化 树脂芯法 

分 类 号：S714.5[农业科学—林学]