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当前位置: 首页 > 文章 > 退化红壤区不同重建模式森林土壤氮素矿化过程及其有效性 江西农业大学学报 2009,31 (2) 102-106
Position: Home > Articles > Comparative Nitrogen Mineralization and Its Availability in Different Rehabilitating Forests in Degraded Red Soil Acta Agriculturae Universitatis Jiangxiensis 2009,31 (2) 102-106

退化红壤区不同重建模式森林土壤氮素矿化过程及其有效性

作  者：
秦晓蕾;余明泉;杨清培;刘苑秋
单  位：
江西农业大学园林与艺术学院
关键词：
退化红壤;重建森林;氮矿化;土壤氮素
摘  要：
采用PVC顶盖埋管法,开展退化红壤区不同重建模式森林土壤N素矿化特征研究,结果表明:(1)不同重建模式森林土壤有效N差异极显著(P<0.001),其中铵态N:无林地=阔叶林=针阔混交林>针叶林;硝态N:针阔混交林>阔叶林>针叶林=无林地;矿质N:针阔混交林>阔叶林>无林地>针叶林。(2)在所有重建模式中NH4+-N是有效N的主体部分,氨化过程更强烈。(3)不同重建模式森林土壤氨化速率差异不显著(P=0.354),而硝化速率和矿化速率均为极显著(P<0.001),硝化速率、矿化速率均表现为阔叶林≥针叶林≥针阔混交林=无林地。总体来看,无论是有效N含量还是N矿化速率阔叶林均为最高,是一种比较好的植被重建模式。深入开展生态系统N平衡的研究有利于更好地评价重建森林的功能。
译  名：
Comparative Nitrogen Mineralization and Its Availability in Different Rehabilitating Forests in Degraded Red Soil
作  者：
QIN Xiao-lei1,YUMing-quan1,2*,YANG Qing-pei1,LIUYuan-qiu1(1.College of Landscape Architecture and Art,JAU,Nanchang330045,China;2.Department of Biolo-gy,Jiangxi Science &Technology Normal University,Nanchang 330038,China)
关键词：
degraded red soil;rehabilitating forest;N mineralization;soil nitrogen
摘  要：
In this study,soil nitrogen mineralization process and its availability were examined by themethod of in situ closed-top PVC tube incubation under different rehabilitating forests in degraded red soil.Results indicated:(1) the available nitrogen was significantly affected by the different rehabilitating forest(P<0.001),NH4+-Nin these forests ranked as:grassland =broadleaf forest=conifer and broadleaf mixed for-est>coniferous forest;NO3--N ranked as:conifer and broadleaf mixed forest >broadleaf forest >coniferousforest=grassland;mineral N was conifer and broadleaf mixed forest>broadleaf forest>grassland >coniferousforest.(2)NH4+-N was the main form of available nitrogen in all rehabilitating forests,its ammonificationprocess was stronger.(3)The effect on ammonification rate was not significant(P=0.354).But both of therates of nitrification and net mineralization were significant,the rates of nitrification and net mineralizationranked as:broadleaf forest≥coniferous forest≥conifer and broadleaf mixed forests grassland.Based on the cor-responding results,it is concluded that broadleaf forest is selectable rehabilitating forests pattern in the study area.To comprehensively assess the ecosystemfunctions,the knowledge of Nbalance in reha bilitating forests is necessary.

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