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| 洞庭湖区不同土地利用方式耕作土壤氮素含量与循环 | |
| 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,2007,15(4):49-52. |
| 作者姓名： | 黄伟生 彭佩钦 黄道友 苏以荣 朱奇宏 |
| 作者单位： | 1. 中国科学院亚热带农业生态研究所,长沙,410125;惠州大亚湾经济技术开发区环境监测站,惠州,516081 2. 中国科学院亚热带农业生态研究所,长沙,410125 3. 华中农业大学资源环境学院,武汉,430070 |
| 基金项目： | 中国科学院知识创新工程项目;国家重点基础研究发展计划(973计划);中国科学院基金 |
| 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/kg2、.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/hm2.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 |
| 收稿时间： | 2005-06-26 |
| 修稿时间： | 2005-10-17 |
Nitrogen cycle and content in plowable soil layer under different land-use types in Dongting Lake region |
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| HUANG Wei-Sheng,PENG Pei-Qin,HUANG Dao-Yo u,SU Yi-Rong and 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. | |
| Authors: | HUANG Wei-Sheng PENG Pei-Qin HUANG Dao-Yo u SU Yi-Rong and ZHU Qi-Hong |
| Institution: | 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;Institu te of Subtropical Agriculture, Chinese Academy of S ciences, Changsha 410125, China;Institu te of Subtropical Agriculture, Chinese Academy of S ciences, Changsha 410125, China;Institu te of Subtropical Agriculture, Chinese Academy of S ciences, Changsha 410125, China;College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China |
| 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). |
| Keywords: | Dongting Lake Land-use types Total N Microbial biomass N N cycle N balance |
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