Nitrous oxide emissions under different soil and land management conditions

被引:108
作者
Henault, C
Devis, X
Page, S
Justes, E
Reau, R
Germon, JC
机构
[1] INRA, Ctr Microbiol Sol & Environm, F-21034 Dijon, France
[2] INRA, Ctr Rech Agron, Unite Agron, F-51686 Reims 2, France
[3] CETIOM, F-75016 Paris, France
关键词
nitrous oxide emissions; soil chamber method; water-filled pore space; nitrous oxide reduction; nitrogen fertilization;
D O I
10.1007/s003740050368
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Nitrous oxide (N2O) emissions of three different soils - a rendzina on cryoturbed soil, a hydromorphic leached brown soil and a superficial soil on a calcareous plateau - were measured using the chamber method. Each site included four types of land management: bare soil, seeded unfertilized soil, a suboptimally fertilized rapeseed crop and an overfertilized rapeseed crop. Fluxes varied from -1 g to 100 g N2O-nitrogen ha(-1) day(-1). The highest rates of N2O emissions were measured during spring on the hydromorphic leached brown soil which had been fertilized with nitrogen (N); the total emissions during a 5-month period exceeded 3500 g N ha(-1). Significant fluxes were also observed during the summer. Very marked effects of soil type and management were observed. Two factors - the soil hydraulic behaviour and the ability of the microbial population to reduce N2O - appear to be essential in determining emissions of N2O by soils. In fact, the hydromorphic leached brown soil showed the highest emissions, despite having the lowest denitrification potential because of its water-filled pore space and low N2O reductase activity. Soil management also appears to affect both soil nitrate content and N2O emissions.
引用
收藏
页码:199 / 207
页数:9
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