滴灌下青椒地N_2O排放规律研究  

N_2O Emission from Green Pepper Field under Drip Irrigation

作　　者：王维汉[1] 毛前[1] 严爱兰[1] 

机构地区：[1]浙江水利水电学院,杭州310018

出　　处：《中国农村水利水电》2014年第7期31-34,共4页China Rural Water and Hydropower

基　　金：浙江省自然科学基金项目(LQ12E09003);2011年浙江省重大科技专项计划项目(2011C12030)

摘　　要：滴灌下青椒地土壤湿润方式与常规灌溉有很大的不同,这将会改变N2O的硝化和反硝化过程,从而影响土壤中的N2O向大气中的排放。采用静态暗箱-气相色谱法,研究了滴灌下青椒地N2O的排放规律。结果表明,青椒地N2O日变化呈现单峰型模态,排放速率均随着土壤温度的升高而增加,在土壤温度下降后N2O排放速率随之减小;最大值均出现在下午14:00左右,最小值出现在早上8:00左右,这与土壤温度的变化规律是一致的。滴灌下青椒地N2O排放通量随着生长季节的延长而逐渐增加,与畦灌相比,滴灌下N2O排放通量波动较小,但排放通量要高出27.90%。因此,在其他农艺条件相同的情况下,滴灌促进了青椒地N2O的排放。The green pepper soil wetting pattern under the mode of drip irrigation technique is very different from the traditional irri- gation mode, which will change the Nz O nitrification and denitrification processes. By using the static opaque chamber and gas chro- matography, N2O emission from green pepper field under the mode of drip irrigation technique is studied. The results show that, the diurnal variation of N2O presents one peak mode, emission rate increases as soil temperature increases, the soil temperature decrea- ses as N2O emission rate decreases, the maximum values appear at about 14 ： 00 PM, the minimum occurs around 8 ： 00 in the morning, it is identical with the variation rule of soil temperature. The N2O emission flux under the model of drip irrigation technol- ogy increases with the growing season. By contrast, smaller fluctuation of N2O emission flux in the mode of drip irrigation technolo- gy, hut its emission flux is 27. 90% higher than conventional irrigation. Therefore, under the same agronomic conditions, the drip irrigation technology model promote the N2 O emissions of green pepper field.

关 键 词：滴灌技术 青椒地 氧化亚氮 排放通量 

分 类 号：S131[农业科学—农业基础科学]