杉木采伐迹地造林树种转变对土壤可溶性有机质的影响  

Effects of tree species transfer on soil dissolved organic matter pools in a reforested Chinese fir( Cunninghamia lanceolata) woodland

作　　者：万晓华[1,2] 黄志群[1,2] 何宗明[3] 胡振宏[1,2] 余再鹏[1,2] 王民煌[1,2] 杨玉盛[1,2] 范少辉[4] 

机构地区：[1]湿润亚热带山地生态国家重点试验室培育基地,福州350007 [2]福建师范大学地理科学学院,福州350007 [3]福建农林大学林学院,福州350002 [4]国际竹藤网络中心,北京100102

出　　处：《应用生态学报》2014年第1期12-18,共7页Chinese Journal of Applied Ecology

基　　金：2011年教育部新世纪优秀人才支持计划项目(DB-168);2012年福建省杰出青年科学基金项目(2060203)资助

摘　　要：以二代杉木林采伐迹地上营造的19年生米老排与杉木人工林为对象，采用冷水、热水和2mol·L-1KCl溶液提取0～5、5～10和10～20cm层土壤中的可溶性有机碳（DOC）和有机氮（DON），研究造林树种转变对土壤可溶性有机质的影响．结果表明：造林树种转变对林地土壤DOC和DON库有显著影响．米老排人工林土壤中用冷水、热水和KCl溶液浸提的DOC含量均显著高于杉木人工林，0～5和5～10cm层土壤中用冷水和热水浸提的DON含量显著高于杉木林．不同方法浸提的DOC和DON含量大小顺序均为KCl〉热水〉冷水．在0—5cm土层，米老排人工林土壤微生物生物量碳（MBC）含量比杉木林高76．3％．相关分析结果显示，热水浸提的DOC和DON与土壤MBC之间均呈显著正相关．不同树种人工林间土壤可溶性有机质的差异主要与凋落物输入的数量和质量有关．在杉木采伐迹地上营造米老排，能锈明昂改善＋壤肥力．Based on the comparison between reforested 19-year-old Mytilaria laosensis and Cun- ninghamia lanceolata plantations on cut-over land of C. lanceolata, effects of tree species transfer on soil dissolved organic matter were investigated. Cold water, hot water and 2 mol· L-1 KCl solu- tion were used to extract soil dissolved organic carbon （DOC） and dissolved organic nitrogen （DON） from 0-5, 5-10 and 10-20 cm soil layers. In M. laosensis plantaion, the concentrations of soil DOC extracted by cold water, hot water and 2 mol. L-1 KCl solutions were significantly high- er than that in C. lanceolata plantation. In the 0-5 and 5-10 cm layers, the concentrations of soil DON extracted by cold water and hot water in M. laosensis plantation were significantly higher than that in C. lanceolata plantation. The extracted efficiencies for DOC and DON were both in order of KC1 solution〉hot water〉cold water. In the 0-5 cm layers, soil microbial biomass carbon （MBC） under M. laosensis was averagely 76.3% greater than under C. lanceolata. Correlation analysis showed that there were significant positive relationships between hot water extractable organic matter and soil MBC. Differences in the sizes of soil DOC and DON pools between the M. laosensis and C. lanceolata forests might be attributed to the quality and quantity of organic matter input. The trans-fer from C. lanceolata to M. laosensis could improve soil fertility in the plantation.

关 键 词：杉木 采伐迹地 土壤可溶性有机碳氮 微生物生物量 树种 

分 类 号：S791.27[农业科学—林木遗传育种]