三峡库区不同土地利用方式下土壤氧化亚氮排放及其影响因素  

Soil N_2O flux and its affecting factors under different land use patterns in Three Gorges Reservoir Area of China.

作　　者：林杉[1] 冯明磊[1] 阮雷雷[1] 胡荣桂[1] 彭业轩 肖宏宇[1] 卢兰[1] 

机构地区：[1]华中农业大学资源与环境学院,武汉430070 [2]湖北省秭归县水土保持局,湖北秭归443600

出　　处：《应用生态学报》2008年第6期1269-1276,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(40471131);教育部重点基金资助项目(03118)

摘　　要：采用静态箱-气相色谱法对菜地、旱地、林地、果园、水改旱土壤N2O排放特征及其相关影响因子进行研究．结果表明：不同土地利用方式下土壤N2O的排放通量在-21～435μg·m^-2·h^-1之间变化，N2O年排放总量为菜地〉果园〉旱地〉水改旱〉林地，分别为447．14、313．57、167．00、124．87和7．24mg·m^-2．土壤N2O排放通量呈现明显的季节性变化，以春夏季最高，秋季次之，冬季最低，并与对应的大气及土壤温度的变化趋势基本一致．N2O排放通量与5cm土壤温度及土壤硝态氮含量呈显著或极显著正相关，与土壤水分及土壤铵态氮含量无明显相关关系．By using static chamber techniques, the N2O emission from soils under different land use patterns was measured. The results showed that the N2O flux ranged from - 21 to 435 μg·m^-2·h^-1, and the annual N20 flux was decreased in the order of vegetable field 〉 orchard 〉 upland 〉 upland transferred from paddy field 〉woodland, being 447. 14, 313.57, 167.00, 124. 875 and 7.24 -2 mg · m^-2, respectively. The N2O flux presented significant seasonal fluctuation, with the maximum in spring and summer, followed by in autumn, and the minimum in winter, which was approximately consistent with the changes of air- and soil temperature. N2O flux had significant positive correlation with the soil temperature at 5 cm depth and soil NO2^- -N content, but no significant correlation with soil moisture and NH4^＋ -N contents.

关 键 词：N2O排放 土地利用方式 土壤硝态氮 

分 类 号：S154[农业科学—土壤学]