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赣中亚热带森林转换对土壤氮素矿化及有效性的影响
引用本文:宋庆妮,杨清培,余定坤,方楷,赵广东,俞社保.赣中亚热带森林转换对土壤氮素矿化及有效性的影响[J].生态学报,2013,33(22):7309-7318.
作者姓名:宋庆妮  杨清培  余定坤  方楷  赵广东  俞社保
作者单位:江西农业大学江西省竹子种质资源与利用重点实验室 南昌,江西农业大学江西省竹子种质资源与利用重点实验室 南昌,江西农业大学江西省竹子种质资源与利用重点实验室 南昌,江西农业大学江西省竹子种质资源与利用重点实验室 南昌,中国林业科学研究院森林生态环境与保护研究所,江西农业大学江西省竹子种质资源与利用重点实验室 南昌;中国林业科学研究院森林生态环境与保护研究所;
基金项目:公益性行业(林业)科研专项经费(201104009-2); 国家林业科技支撑计划课题(2006BAD03A0703,2012BAC11B02); 江西省教育厅科学技术研究项目(GJJ08192) ;收稿日期 *通讯作者Corresponding author. E-mail:Qingpeiyang@126.com.
摘    要:采用原位培养法和时空替代法,对江西中部亚热带常绿阔叶林、天然马尾松林、人工杉木林、人工马褂木林的土壤氮素矿化速率及其有效性进行了比较研究,以探讨森林转换对土壤氮素矿化作用的影响。结果表明:转换前后各森林土壤无机氮库(NH4 -N、NO3--N)及氮素矿化速率(氨化速率、硝化速率)均呈现明显的季节动态,NH4 -N库冬春较大,NO3--N库夏秋较大,氨化速率与硝化速率均以夏秋强烈。森林转换改变了土壤氮素矿化格局,常绿阔叶林转变成马尾松林、杉木林、马褂木林后,土壤年均氨化速率分别降低了110.67%、100.76%、96.20%,而硝化速率提高了54.92%、24.19%、 24.46%;马尾松林年均总净矿化速率与常绿阔叶林相近,杉木林、马褂木林分别降低了24.68%、26.01%;另外,除常绿阔叶林外,马尾松林、杉木林、马褂木林的土壤氮素矿化量都小于植被吸收量。这些研究结果说明亚热带地区常绿阔叶林转换成其它次生林会增加氮素流失的危险性,氮素缺乏会成为这些森林生长的限制因子。

关 键 词:氮素矿化  氮素有效性  森林转换  亚热带  大岗山
收稿时间:8/2/2012 12:00:00 AM
修稿时间:2013/3/14 0:00:00

The effects of forest conversion on soil N mineralization and its availability in central jiangxi subtropical region
SONG Qingni,YANG Qingpei,YU Dingkun,FANG Kai,ZHAO Guangdong and YU Shebao.The effects of forest conversion on soil N mineralization and its availability in central jiangxi subtropical region[J].Acta Ecologica Sinica,2013,33(22):7309-7318.
Authors:SONG Qingni  YANG Qingpei  YU Dingkun  FANG Kai  ZHAO Guangdong and YU Shebao
Institution:Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Application,JXAU,Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Application,JXAU,Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Application,JXAU,Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Application,JXAU,Institute of Forest Ecology Environment and Protection,CAF,Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Application,JXAU;Institute of Forest Ecology Environment and Protection,CAF;China
Abstract:In order to study the effects of forest transformation on soil nitrogen (N) mineralization and its availability, the inorganic nitrogen (NH4 -N and NO3--N) content, N mineralization (ammonification, nitrification) rates were examined using incubation method with a PVC tube in-situ in evergreen broad-leaved forest (EBF), Pinus massoniana forest (PMF), Cunninghamia lanceolata plantation (CLP), Liriodendron chinense plantation (LCP) in Dagangshan National Ecological Station, Jiangxi province. The results showed all forests performed seasonal dynamics for their soil inorganic N pools and mineralization rates, NH4 -N being larger in winter and spring, NO3--N being larger in summer and autumn, and ammonification and nitrification being intensively in summer and autumn. During forest conversion from EBF to PMF, CLP and LCP, N mineralization pattern had been changing, annual ammonification reducing by 110.67%, 100.76%, 96.20%, nitrification increasing by 54.92%, 24.19%, 24.46% respectively. Compared with EBF, N total mineralization rate of PMF remained nearly consistent, while CLP and LCP declined 24.68 %, 26.01% respectively. Meanwhile, N mineralization of PMF, CLP and LCP were less than their needs for N uptake. These findings indicated that the forest transformation from EBF to other secondary forests would induce N leaching out of the forest ecosystems, N deficiency might become a growth-limiting factor for these forests.
Keywords:Nitrogen mineralization  Availability  Forest transformation  Subtropical forest  Dagangshan Mountain
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