Selection of the most suitable sampling time for static chambers for the estimation of daily mean N2O flux from soils

被引：198

作者：

Alves, Bruno J. R. ^{[1
]}

Smith, Keith A. ^{[2
]}

Flores, Rilner A. ^{[3
]}

Cardoso, Abmael S. ^{[3
]}

Oliveira, William R. D. ^{[3
]}

Jantalia, Claudia P. ^{[1
]}

Urquiaga, Segundo ^{[1
]}

Boddey, Robert M. ^{[1
]}

机构：

[1] Embrapa Agrobiol, BR-23890000 Seropedica, RJ, Brazil

[2] Univ Edinburgh, Sch Geosci, Edinburgh EH9 3JN, Midlothian, Scotland

[3] Univ Fed Rural Rio Janeiro, Inst Agron, Dept Soils, BR-23890970 Seropedica, RJ, Brazil

来源：

SOIL BIOLOGY & BIOCHEMISTRY | 2012年 / 46卷

关键词：

Air temperature; Diurnal variation; Nitrous oxide; Soil moisture; Static chamber; NITROUS-OXIDE EMISSION; FILLED PORE-SPACE; CH4; FLUXES; TEMPERATURE; WATER; FOREST; IMPACT;

D O I：

10.1016/j.soilbio.2011.11.022

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Soil N2O fluxes are frequently assessed by the use of static chambers with a single daily sampling. In this study, two experiments were conducted in two contrasting climatic locations, one in Edinburgh, UK, and the other at Seropedica, Rio de Janeiro State, Brazil. Soil N2O fluxes were monitored every 6 h for 30 days during the summer in Edinburgh by the use of an automatic chamber system, and every 3 h for 5 days at Seropedica, using a manually-sampled static chamber. Air and soil temperatures were also measured at the same time as the N2O fluxes. The principal driver of N2O flux within any diurnal period was found to be soil temperature. Regression analysis showed that, for both places, the evenings (21:00-22:00 h) and mornings (09:00-10:00 h), were the times that the flux best represented the daily mean. The ability to work in daylight make the morning period the preferred one. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：129 / 135

页数：7

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