Methane and nitrous oxide fluxes in native, fertilized and cultivated grasslands

摘要: METHANE and nitrous oxide are long-lived, radiatively active trace gases that account for ∼20% of the total anticipated atmospheric warming1. The concentrations both have increased dramatically over past few decades, continue to increase at a rate ∼1.1 0.25% yr−1 CH4 (ref. 2) N2O 3) respectively. Increased biospheric production is gen-erally suggested as reason increases, but decreases in global sinks may also be important. It has been suggested, example, nitrogen fertilization decrease which tropical4,5 temperate forest soils6 take up methane from atmosphere. Furthermore, recent extensive changes land management cultivation could contributing observed increases N2O, tropical soils7. Little information exists on uptake grasslands (which currently occupy ∼8% Earth's surface), its relation production, or effect cultivation8,9. Here we report measurements emissions native, nitrogen-fertilized wheat-growing prairie soils spring late autumn, 1990. We found can thereby increasing these gases.