| 重庆缙云山4种典型林分土壤氮素动态变化 |
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| 引用本文： | 孙素琪,王玉杰,王云琦,张会兰,于 雷,刘 勇.重庆缙云山4种典型林分土壤氮素动态变化[J].环境科学研究,2015,28(1):66-73. |
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| 作者姓名： | 孙素琪 王玉杰 王云琦 张会兰 于 雷 刘 勇 |
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| 作者单位： | 北京林业大学, 水土保持与荒漠化防治教育部重点实验室, 北京 100083 |
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| 基金项目： | 国家自然科学基金项目(31100515) |
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| 摘 要： | 于2012年4—10月逐月月末采集重庆缙云山4种典型林分(常绿阔叶林、毛竹林、针阔混交林和针叶林)样地中不同深度(0~15、>15~30、>30~60 cm)的土壤样品,测定土壤中w(TN)、w(NH4+-N)和w(NO3--N),分析土壤氮素含量的分布特征,并探讨土壤理化性质对土壤氮素含量的影响. 结果表明:①不同林分土壤中氮素含量的垂直分布规律相一致,均表现为随土壤深度的增加而不断降低,并且w(NH4+-N)>w(NO3--N)；②不同林分0~60 cm土壤平均氮密度表现为毛竹林(1.037 kg/m2)>针阔混交林(0.783 kg/m2)≈常绿阔叶林(0.778 kg/m2)>针叶林(0.747 kg/m2)；③不同林分土壤中w(TN)的季节性变化规律不明显,而w(NH4+-N)和w(NO3--N)的季节性变化规律相似,均表现为春季<夏季<秋季；④不同林分土壤中w(TN)、w(NH4+-N)和w(NO3--N)与容重、w(SOC)均呈显著线性相关(P<0.05),而且与土壤其他养分含量之间也存在一定的相关性.
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| 关 键 词： | 缙云山 林分类型 土壤氮素含量 氮密度 土壤理化性质 |
| 收稿时间： | 2014/1/10 0:00:00 |
| 修稿时间： | 2014/7/10 0:00:00 |
Dynamic Variation of Soil Nitrogen Contents in Four Typical Forest Stands on Jinyun Mountain, Chongqing |
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| SUN Suqi,WANG Yujie,WANG Yunqi,ZHANG Huilan,YU Lei and LIU Yong.Dynamic Variation of Soil Nitrogen Contents in Four Typical Forest Stands on Jinyun Mountain, Chongqing[J].Research of Environmental Sciences,2015,28(1):66-73. |
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| Authors: | SUN Suqi WANG Yujie WANG Yunqi ZHANG Huilan YU Lei and LIU Yong |
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| Affiliation: | Key Laboratory of Soil and Water Conservation and Combating Desertification, Ministry of Education, Beijing Forestry University, Beijing 100083, China |
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| Abstract: | An evergreen broad-leaved forest (EBF), a bamboo forest (BF), a mixed forest (MF) and a coniferous forest (CF) on Jinyun Mountain, Chongqing, were selected to investigate the distribution characteristics of soil nitrogen affected by soil physical and chemical properties. The soil samples at 0-15, >15-30 and >30-60 cm depths were collected at the end of each month from April to October, 2012, and w(TN), w(NH4+-N) and w(NO3--N) were subsequently measured. The results indicated that:1) w(TN), w(NH4+-N) and w(NO3--N) showed decreasing trends in the vertical distribution with increasing depths for different forests, and w(NH4+-N)>w(NO3--N). 2) The average nitrogen density at 0-60 cm depths for different forests was in the decreasing order:BF(1.037 kg/m2)>MF(0.783 kg/m2)≈EBF(0.778 kg/m2)>CF(0.747 kg/m2). 3) The seasonal variation of w(TN) was not regular, but seasonal variation regulations of w(NH4+-N) and w(NO3--N) were spring+-N) and w(NO3--N) had positive relation to soil bulk density and w(SOC) (P<0.05), and there was certain correlation among other nutrients. |
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| Keywords: | Jinyun Mountain forest stands soil nitrogen contents nitrogen density soil physical and chemical properties |
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