Greenhouse gases in intensive agriculture: Contributions of individual gases to the radiative forcing of the atmosphere

被引：956

作者：

Robertson, GP ^{[1
]}

Paul, EA

Harwood, RR

机构：

[1] Michigan State Univ, Dept Crop & Soil Sci, Hickory Corners, MI 49060 USA

[2] Michigan State Univ, WK Kellogg Biol Stn, Hickory Corners, MI 49060 USA

[3] Michigan State Univ, Dept Crop & Soil Sci, E Lansing, MI 48824 USA

来源：

SCIENCE | 2000年 / 289卷 / 5486期

关键词：

D O I：

10.1126/science.289.5486.1922

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Agriculture plays a major role in the global fluxes of the greenhouse gases carbon dioxide, nitrous oxide, and methane. From 1991 to 1999, we measured gas fluxes and other sources of global warming potential (GWP) in cropped and nearby unmanaged ecosystems. Net GWP (grams of carbon dioxide equivalents per square meter per year) ranged from 110 in our conventional tillage systems to -211 in early successional communities. None of the annual cropping systems provided net mitigation, although soil carbon accumulation in no-till systems came closest to mitigating all other sources of GWP. In all but one ecosystem, nitrous oxide production was the single greatest source of GWP. In the Late successional system, GWP was neutral because of significant methane oxidation. These results suggest additional opportunities for Lessening the GWP of agronomic systems.

引用

页码：1922 / 1925

页数：4

共 19 条

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