凋落物管理和城市环境胁迫对湿地松林土壤氮素矿化过程的耦合效应  

Interactive Effects of Litter Removal and Urbanization Environment Change on Soil Nitrogen Mineralization in Slash Pine Plantations

作　　者：沈文清[1] 余明泉[2] 胡小飞[3] 冯雪[3] 任文[3] 陈伏生[3] 

机构地区：[1]江西省山江湖开发治理委员会办公室,江西南昌330046 [2]江西科技师范学院生命科学学院,江西南昌330038 [3]南昌大学江西省植物资源重点实验室,江西南昌330031

出　　处：《江西农业大学学报》2011年第6期1236-1241,共6页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家自然科学基金项目(30960311);国家自然科学青年基金项目(30600473)

摘　　要：以南昌"城区—郊区—乡村"梯度下的湿地松(Pinus elliottii)人工林为对象,采用原位控制和PVC顶盖埋管法,开展凋落物管理措施和城市化所引起的环境变化对森林土壤氮素(N)转化及其有效性季节动态影响的研究。结果表明,凋落物移除有利于抑制土壤硝化过程,提高土壤NH4+-N含量。城市化过程易加速土壤N转化速率,尤其是提高土壤硝化速率和NO3--N含量。凋落物移除和城市环境胁迫对森林土壤N矿化速率和N有效性的含量、组成及其季节动态均存在明显的耦合效应;城区森林可通过移除凋落物来应对N沉降等城市环境所带来的负面影响,而乡村森林保持完整的凋落物层有利于提高土壤N矿化及其供应能力;城市森林的管理对策应该有别于传统林业。The effects of litter management practice and urbanization environment change on soil nitrogen（N） transformation and its availability were studied in slash pine（Pinus elliottii） plantations across urban-suburban-rural gradients of Nanchang City using in situ PVC tube incubation method.The results showed that litter removal would inhibit nitrification and decrease soil NH4＋-N concentrations.Urbanization would lead to acceleration of soil N transformation rate,and especially improve nitrification rate and soil NO3——N concentration.The interactive effects of litter removal and urbanization environment pressure were found on the amount,components and seasonality of soil N mineralization rate and N availability.Therefore,litter removal in urban forests would be helpful to alleviate the negative urbanization influence on N cycling,however litter input in rural forest should be a good way to increase soil N mineralization and N availability.In sum,urban forests management would differ with that in traditional forestry.

关 键 词：城市森林 土壤氮素矿化 顶盖埋管法 生态系统管理 

分 类 号：S791.246[农业科学—林木遗传育种]