氮添加对典型阔叶红松林净初级生产力的影响  

Impacts of nitrogen addition on net primary productivity in the typical mixed broadleaved-Korean pine forest

作　　者：毛宏蕊 金光泽[1] MAO Hong-rui JIN Guang-ze(Center for Ecological Research, Northeast Forestry University, Harbin,Heilongjiang, 150040, P. R. China.)

机构地区：[1]东北林业大学生态研究中心

出　　处：《北京林业大学学报》2017年第8期42-49,共8页Journal of Beijing Forestry University

基　　金：中央高校基本科研业务费专项(2572017EA02);国家重大科学研究计划项目(2014CB953803)

摘　　要：大气氮(N)浓度日益升高,N沉降对森林生态系统生产力的影响成为当前研究的热点。本研究在典型阔叶红松林内,使用尿素(CO(NH_2)_2)作为N源,通过向森林地表施N肥的方式对森林生态系统进行为期6年的N添加试验,探究N对森林生态系统各组分碳(C)密度及净初级生产力(NPP)的影响。施N水平分别为N0(0 kg/(hm^2·a))、N1(30 kg/(hm^2·a))、N2(60 kg/(hm^2·a))和N3(120 kg/(hm^2·a))。结果表明:N添加对森林生态系统植被C库、碎屑C库及土壤C库C密度均无显著影响(P>0.05);对整个森林生态系统的NPP无显著影响,然而对针叶NPP表现出显著抑制作用(P<0.05),对阔叶NPP表现出显著促进作用。土壤全N含量不受施N影响,但与土壤有机C浓度呈现极显著(P<0.01)的正相关关系,表明土壤全N含量是土壤有机C的重要影响因素。The impact of nitrogen（ N） on net primary productivity（ NPP） of forest ecosystem has become focus of the researchers since N deposition is increasingly serious. A six-year field experiment was conducted in the typical mixed broadleaf-Korean pine forest in Xiaoxing＇an Mountains,northeastern China,to explore the effects of N addition on carbon（ C） density and NPP of forest ecosystem and its components. Urea was selected as N source and four levels of N addition were control（ N0,0 kg/（ ha·a）,low N（ N1,30kg/（ ha·a）,medium N（ N2,60 kg/（ ha·a） and high N（ N3,120 kg/（ ha·a）. Results showed that N addition had no significant effects on C density of vegetation C pool,detritus C pool and soil organic C pool（ P 〉0. 05）. N addition had no significant effects on the NPP of whole forest ecosystem,however,it inhibited NPP of coniferous tree leaf but promoted that of broadleaved trees（ P 〈0. 05）. Soil total N concentration had no significant difference among different N addition treatments,but it had a highly significantly positive correlation with soil organic C concentration（ P 〈0. 01）. We suggest that soil total N concentration has a significant influence on soil organic C in forest ecosystem,rather than N addition amount.

关 键 词：氮 碳密度 净初级生产力 典型阔叶红松林 土壤全氮含量 土壤有机碳浓度 

分 类 号：S718.556[农业科学—林学]