| 引用本文: | 黄伟生,彭佩钦,黄道友,苏以荣,朱奇宏. 洞庭湖区不同土地利用方式耕作土壤氮素含量与循环[J]. 中国生态农业学报(中英文), 2007, 15(4): 49-52 |
| HUANG Wei-Sheng,PENG Pei-Qin,HUANG Dao-Yo u,SU Yi-Rong,ZHU Qi-Hong. Nitrogen cycle and content in plowable soil layer under different land-use types in Dongting Lake region[J]. Chinese Journal of Eco-Agriculture, 2007, 15(4): 49-52 |
| DOI： | DOI:10.3724/SP.J.1011.year_id].049 |
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| 摘要: 通过对洞庭湖典型地区的密集采样分析和农户调查,研究了4种利用方式耕作土壤全N、微生物生物量氮（MB-N）含量、两者关系和N素循环特征。结果表明：耕作土壤全N、MB-N含量平均值为3.00±0.48g/kg和 101.4±49.2mg/ kg。双季稻、一季稻、水田旱作和旱地全N平均含量依次为3.12±0.40g/kg、3.03±0.39g/kg、2.79±0.43g/kg、2.10±0.46g/kg。4种利用方式的MB-N含量分别为124.0±56.6mg/kg、96.4±39.2mg/kg、108.0±48.6mg/kg、75.2±30.5mg/kg。除水田旱作外，MB-N 与全N之间存在极显著的正相关关系（P<0.01)。土壤N素盈余量依次为双季稻（105.0kg/hm2·a）>一季稻（75.1kg/hm2·a）>水田旱作油菜（64.5kg/ hm 2·a)>旱地苎麻(51.9kg/hm2·a)。 |
| 关键词: 洞庭湖区 土地利用方式 全N 微生物生物量氮 N循环 N平衡 |
| 中图分类号: |
| 基金项目:中国科学院知识创新工程项目（KZCX3-SW-426）、 国家重点基础研究发展规划项目（2002CB412503）和中国科学院知识创新工程领域前沿项目 （02200220020223） |
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| Nitrogen cycle and content in plowable soil layer under different land-use types in Dongting Lake region |
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HUANG Wei-Sheng1,2, PENG Pei-Qin3, HUANG Dao-Yo u3, SU Yi-Rong3, ZHU Qi-Hong4
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1.Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;2.Environmental Monitoring Station of Huizhou Dayawan Economic Technological Development Zone, Huizhou 516081,China;3.Institu te of Subtropical Agriculture, Chinese Academy of S ciences, Changsha 410125, China;4.College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
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| Abstract: By high density sampling and farming household investigation,total N content,microbial biomass N(MB-N) content, total N and MB-N relationship,and N cycle characteristics and N balance of plowable soil layer under different land-use types were studied in Dongting Lake region.Results show 3.00±0.48g/kg total N content and 101.4±49.2mg/kg MB-N content in farmlands respectively.Total N contents for double cropping paddy fields,single cropping paddy fields,dry farming paddy fields and dry lands are 3.12±0.40g/kg,3.03±0.39g/kg,2.79±0.43g/kg and 2.10±0.46g/kg;and MB-N contents are 124.0±56.6mg/kg,96.4±39.2mg/kg,108.0±48.6mg/kg and 75.2±30.5mg/kg respectively. Except for dry farming in paddy soils ,MB-N and total N are significantly passively correlative (P<0 .01)for all other land-use types.The order of N surplus for the different land-use types is:double cropping paddy field(105.0 kg/hm2·a)>single cropping paddy field (75.1kg/hm2·a)>dry farming paddy soil (64.5kg/hm2·a)>dry land(51.9kg/hm2·a). |
| Keyword: Dongting Lake, Land-use types, Total N, Microbial biomass N, N cycle, N balance |
