模拟氮沉降对杉木人工林土壤有效养分的影响  

Available nutrients with increased N deposition in soils of Cunninghamia lanceolata plantations

作　　者：袁颖红[1] 樊后保[1] 王强[2] 裘秀群[2] 陈秋凤[2] 李燕燕[1] 黄玉梓[3] 廖迎春[1] 

机构地区：[1]南昌工程学院生态与环境科学研究所,江西南昌330099 [2]福建农林大学林学院,福建福州350002 [3]福建农林大学生命科学学院,福建福州350002

出　　处：《浙江林学院学报》2007年第4期437-444,共8页Journal of Zhejiang Forestry College

基　　金：国家自然科学基金资助项目(30370259);教育部留学回国人员科研启动基金资助项目;福建省自然科学基金重点资助项目(B0320001)

摘　　要：通过野外模拟试验,研究了氮沉降增加对杉木Cunninghamia lanceolata人工林土壤有效养分的影响。试验设计为4种处理,分别为N0(0 kg.hm-2.a-1),N1(60 kg.hm-2.a-1),N2(120 kg.hm-2.a-1),N3(240 kg.hm-2.a-1),每处理重复3次。以CO(NH2)2作为氮源,每月以溶液方式对林地进行喷施。通过2 a的处理后发现,随着氮沉降水平的增加,各处理土壤pH值、土壤速效磷、土壤速效钾、土壤交换性钙和土壤交换性镁质量分数均呈下降趋势,而铵态氮和硝态氮质量分数则不断上升。各处理中,不同层次土壤铵态氮、硝态氮、速效磷、速效钾、交换性钙和交换性镁质量分数随土层深度增加而下降,而土壤pH值随土层深度增加而增加。A field experiment was set up to study the effects of increased N deposition on the chemical properties of the soils under Chinese fir（Cunninghamia lanceolata）plantations growing in mid-western Fujian,China.Treatments were designed as 0 kg·hm^-2·a^-1N,60 kg·hm^-2·a^-1N,120 kg·hm^-2·a^-1 N,and 240 kg·hm^-2·a^-1N,with three replicates in each treatment.Urea was used as the source of N and its solutions were sprayed on the forest ground each month for two years.Results showed that pH,available P and K,and exchange-eable Ca^2＋ and Mg^2＋ in the soils decreased,but NH4^＋-N and NO3^--N increased with increasing N deposition.For all the treatments,soil available nutrient levels decreased（P〈0.01）with the soil depth,but soil pH increased（P〈0.05）with increasing depth.

关 键 词：土壤学 模拟氮沉降 杉木人工林 土壤有效养分 铵态氮 硝态氮 

分 类 号：S153.6[农业科学—土壤学] S714.5[农业科学—农业基础科学]