黄土高原人工油松林土壤碳氮对短期氮添加的响应  

Responses of Soil Carbon and Nitrogen to Short Term Nitrogen Addition in Pinus tabulaeformis Carrière Forest on the Loess Plateau

作　　者：陈磊 朱广宇 刘玉林 上官周平[1] 邓蕾[1] CHEN Lei;ZHU Guangyu;LIU Yulin;SHANGGUAN Zhouping;DENG Lei(State Key Laboratory of Soil Erosion and DryZand Farming on the Loess Plateau,Northwest A＆ F University,Yangling,Shaanxi 712100)

机构地区：[1]西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100

出　　处：《水土保持学报》2018年第4期346-352,共7页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(41730638);国家"十二五"科技支撑计划项目(2015BAC01B03)

摘　　要：为了更好地理解土壤碳氮元素对氮添加的响应,通过短期原位模拟氮沉降试验,揭示黄土高原子午岭人工油松(Pinus tabulaeformis Carrière)林土壤碳氮对外源氮添加的响应过程和机制。从2015—2016年设置4个氮添加水平,分别为对照(0kg/(hm^2·a),N0)、低氮(50kg/(hm^2·a),N50)、中氮(100kg/(hm^2·a),N100)和高氮(200kg/(hm^2·a),N200),研究人工油松林地不同深度土层土壤有机碳和全氮以及土壤碳氮储量对模拟氮添加的响应。结果表明:土层对土壤有机碳、全氮和碳氮储量有显著影响,上层土壤有机碳、全氮和碳氮储量显著高于下层土壤;氮添加水平对土壤有机碳、土壤碳储量影响不显著,但可显著影响土壤全氮和氮储量。此外,土壤有机碳、全氮和碳氮储量和土壤碳氮储量比受地下生物量碳氮比的影响显著。因此,短期氮添加对人工油松林地土壤碳的影响不显著,但可显著影响土壤氮,地下生物量碳氮比是影响土壤碳氮的重要因素。To better understand the responses of soil carbon and nitrogen to the nitrogen addition,this paper revealed the response processes and mechanisms of soil carbon and nitrogen to exogenous nitrogen addition through a short-term simulated nitrogen deposition experiment in artificial Pinus tabulaeformis Carrière plantation in Ziwuling Mountain of the Loess Plateau.From 2015 to 2016,four nitrogen addition levels,including control（0 kg/（hm^2·a）,N0）,low nitrogen（50 kg/（hm^2·a）,N50）,medium nitrogen（100 kg/（hm^2·a）,N100）,and high nitrogen（200 kg/（hm^2·a）,N200）,were set up to study the responses of soil organic carbon（SOC）,total nitrogen（TN）and soil carbon and nitrogen storage（CSand NS）in different soil depths to the simulated addition nitrogen.The results showed that soil layer had significantly influence on SOC,TN,CSand NS.SOC,TN,CSand NSin the surface layer were significantly higher than those in the deeper soil layers.Nitrogen addition level had no significant impact on the SOC and CS,while significantly affected the TN and NS.In addition,SOC,TN,CSand NS,and CS/NSwere significantly affected by the carbon nitrogen ratio（C/N）of belowground biomass.Therefore,short-term nitrogen addition had no significant influence on soil carbon,but it could significantly affect soil nitrogen,and C/N of belowground biomass was the important factor affecting soil carbon and nitrogen.

关 键 词：氮添加 有机碳 全氮 地下生物量 凋落物 

分 类 号：S153[农业科学—土壤学] S791.254[农业科学—农业基础科学]