密度调控对女贞人工林土壤铵态氮和硝态氮季节变化的影响  

Effect of Density-Dependent on Seasonal Variation of Soil NH_4^+-N and NO_3^--N in Ligustrum lucidum Plantation

作　　者：卢雯[1] 邱雷[1] 丁辉[1] 关庆伟[1] 陈信力[1] 彭婷婷[1] 

机构地区：[1]南京林业大学森林资源与环境学院,江苏南京210037

出　　处：《西南林业大学学报（自然科学）》2014年第2期1-7,24,共8页Journal of Southwest Forestry University：Natural Sciences

基　　金："十二五"国家科技支撑项目(2011BAD38B03-2)资助

摘　　要：以江苏扬州市江都区7年生女贞人工林为对象,研究密度调控对其土壤铵态氮(NH+4-N)和硝态氮(NO-3-N)含量剖面分布特征及季节变化的影响。结果表明:不同调控密度下女贞人工林土壤NH+4-N和NO-3-N含量均随着土层深度的增加而逐渐降低,且表现出明显的季节变化;3种密度调控下土壤NH+4-N含量均是秋冬两季较高,春季最低,夏季又有明显回升,且3种密度中的2 275株/hm2下NH+4-N含量在4个季节均高于另外2种密度;土壤NO-3-N季节变化与NH+4-N大体一致,在春季含量最低,但不同密度间变化趋势差异较大;土温、含水量及有机质均与土壤NH+4-N和NO-3-N含量存在显著的相关关系(p<0.05),且在夏季均达到极显著相关(p<0.01)。The effect of density-dependent of plantation on the characteristics of profile distribution and season-al variation of soil NH4＋-N and NO3--N contents were studied based on the 7 a Ligustrum lucidum plantation in Jiangdu District of Yangzhou Municipality.The results showed that the contents of soil NH4＋-N and NO3--N in plantations with different densities decreased with soil depth,which also showed significant changes with different seasons.The content of NH4＋-N in 3 densities was all higher in autumn and winter with the lowest value in the spring,and the content increased again in the summer.The NH4＋-N content of the plantation with density of 2 275 trees/hm2 was always higher than that of plantations with another two densities in the four different seasons. The seasonal change of NO3--N content basically followed the same trend as NH4＋-N content,with the lowest value in the spring,but there were significant differences among plantations with different densities.Contents of NH4＋-N and NO3--N were significantly correlated with soil moisture,temperature,and organic matter content （p〈0.05）,and they were extremely significantly correlated with those factors in the summer （p〈0.01）.

关 键 词：女贞人工林 硝态氮 铵态氮 分布特征 季节变化 密度调控 

分 类 号：S714.8[农业科学—林学]