Gas pooling: A sampling technique to overcome spatial heterogeneity of soil carbon dioxide and nitrous oxide fluxes

被引：45

作者：

Arias-Navarro, Cristina ^{[1
]}

Diaz-Pines, Eugenio ^{[2
]}

Kiese, Ralf ^{[2
]}

Rosenstock, Todd S. ^{[3
]}

Rufino, Mariana C. ^{[4
]}

Stern, David ^{[5
]}

Neufeldt, Henry ^{[3
]}

Verchot, Louis V.

Butterbach-Bahl, Klaus ^{[2
,4
,6
]}

机构：

[1] Ctr Int Forestry Res CIFOR, Nairobi, Kenya

[2] Karlsruhe Inst Technol, Inst Meteorol & Climate Res, D-82467 Garmisch Partenkirchen, Germany

[3] World Agroforestry Ctr ICRAF, Nairobi, Kenya

[4] Int Livestock Res Inst ILRI, Nairobi, Kenya

[5] Maseno Univ, Maseno, Kenya

[6] Ctr Int Forestry Res CIFOR, Bogor, Indonesia

来源：

SOIL BIOLOGY & BIOCHEMISTRY | 2013年 / 67卷

关键词：

Composite sample; Pooling technique; Soil CO2 and N2O fluxes; Spatial variability; Static chamber; EASTERN AMAZONIA; EMISSIONS; ATMOSPHERE; CHAMBERS;

D O I：

10.1016/j.soilbio.2013.08.011

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Small-scale spatial variability in soil carbon dioxide (CO2) and nitrous oxide (N2O) fluxes poses serious challenges to the experimental design, and number of gas samples needed to provide a reliable estimate of flux usually exceeds analytical capacities. We pooled gas samples -analogously to soil pooling - to overcome this challenge. Our sample pooling technique collects a composite gas sample from several chambers instead of the conventional practise of analyzing samples from chambers individually, thus reducing numbers of gas samples. The method was verified to be reasonably accurate in forest, grassland and agricultural fields over a four week measurement campaign. Pooling technique results differed by 2-8% for CO2 and by 3-4% for N2O when compared to individual chamber means. That shows pooling of gas samples across individual static chambers is an acceptable approach to integrate spatial heterogeneity. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：20 / 23

页数：4

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