安徽老山亚热带常绿阔叶林降雨中氮和可溶性有机碳的动态变化  

Dynamics of TOC and N in Precipitation in Subtropical Evergreen Broad-leaved Forest at Laoshan Mountains,South Anhui

作　　者：张赟齐[1] 王陆军[1] 丁正亮[1] 曾玲梅[1] 徐小牛[1] 

机构地区：[1]安徽农业大学林学与园林学院,合肥230036

出　　处：《水土保持学报》2010年第2期146-149,164,共5页Journal of Soil and Water Conservation

基　　金：国家自然科学基金资助项目(30471386;30771719)

摘　　要：对安徽老山自然保护区亚热带常绿阔叶林降雨中可溶性碳和氮动态进行了研究。结果表明,该地区大气降雨pH为6.82,呈中性;TOC含量为3.330mg/L,NH4+-N含量为0.405mg/L,NO3-N含量0.501mg/L。降雨经过冠层后,物质成分的含量发生显著改变。穿透雨的TOC含量为10.498mg/L,NH4+-N含量为0.454mg/L,NO3-N含量为0.959mg/L,分别是林外降雨的3.15,1.12,1.91倍。树干径流的TOC含量为21.157mg/L,NH4+-N含量为0.972mg/L,NO3-N含量为1.040mg/L,分别是林外降雨的6.35,2.40,2.08倍。TOC及氮含量的低值都是出现在夏季生长旺盛期,可能与树木在此期需要大量的养分来维持有关,而林外雨各物质含量的出现低值主要与降雨强度、降雨量有关。In nutrient cycling study,a growing attention has been paid to TOC and DON in forest ecosystems,particularly focusing on the soil-vegetation-atmosphere interaction.There was little information on the transportation of TOC and DON during the hydrological processes in forest ecosystems.In this study,the seasonal dynamic patterns of TOC and DON were investigated in a subtropical evergreen broad-leaved forest over one year in Laoshan Natural Reserve,south Anhui.The results showed that the concentrations of TOC,NH4^＋-N,NO3^--N were significantly increased after rain passed through forest canopies.The mean concentration of TOC,NH4^＋-N,NO3^--N were,respectively,3.330,0.405,0.501 mg/L for the bulk precipitation;10.498,0.454,0.959 mg/L for the throughfall and 21.157,0.972,1.040 mg/L for the stemflow.No clear monthly variation in TOC concentration was found in throughfall and stemflow.However,DON concentration tended to be lower during high precipitation months,particularly during July and August.TOC concentration in the hydrological processes fluctuated with pH of rainwater intensively.

关 键 词：森林水文 可溶性有机碳 可溶性氮 穿透雨 树干径流 

分 类 号：S715[农业科学—林学] X824[环境科学与工程—环境工程]