N2O and CO2 emissions from arable and grassland soils under various moisture regimes: a microcosm study

Shah Ambreen, . and Gaebler Ralph, . N2O and CO2 emissions from arable and grassland soils under various moisture regimes: a microcosm study. pp. 95-110. ISSN 1394-7990

Greenhouse gas emissions have increased during the last century due to human activities such as agricultural practices fossil fuel burning and industrial practices. However the formation of greenhouse gases in particular N2 O or CO2 is strongly controlled by both soil temperature and soil moisture. A laboratory experiment was conducted to assess the response of grassland and arable soils with regard to N2 O and CO2 flow and mineral nitrogen concentration; soils were exposed to various drying- rewetting cycles at different gravimetric water contents (wt) under controlled conditions for a duration of 60 days. In total four treatments were conducted: soils under continuously moist conditions (control) at 32 wt; soils received short drying-rewetting cycles (SDWC) of between 32 to 21 wt; soils exposed to medium drying rewetting cycles (MDWC) of between 32 to 18 wt and a treatment with long drying-rewetting cycles (LDWC) of between 32 to 5 wt. Short medium and long drying-rewetting cycle treatments went through 6 4 and 2 drying-rewetting cycles (DWC) (0.1 0.07 and 0.03 drying-rewetting frequencies). Soil samples of arable and grassland soils were analyzed for NH4 and NO3 - at the different stages of incubation in order to compare changes over time. The results indicated that arable and grassland soils reduced N2 O-N flow in the long drying-rewetting treatments. For the grass soil the short drying-rewetting cycle treatment yielded the highest cumulative N2 O-N flow (325 g kg-1). In arable soil however the long drying-rewetting cycles receiving treatment released 69 less N2 O-N flow as compared to the other treatments. For the CO2 -C flow soils showed differing patterns with the shortly dried-rewetted cycle treatment of grassland soils yielding the highest (130 g kg-1) cumulative flow that was 25 higher than LDWC. Drying-rewetting cycles (DWC) on grass soils had no effect. The stressed treatments emitted only 19 higher CO2 -C flow than the control. The treatment with 5 (wt) successfully reduced N2 O-N flow in grassland and arable soils. Soil net nitrogen mineralization (NNM) and nitrification (NNN) rates of arable soils were significantly higher than in grassland soils.

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Abstract

Greenhouse gas emissions have increased during the last century due to human activities such as agricultural practices fossil fuel burning and industrial practices. However the formation of greenhouse gases in particular N2 O or CO2 is strongly controlled by both soil temperature and soil moisture. A laboratory experiment was conducted to assess the response of grassland and arable soils with regard to N2 O and CO2 flow and mineral nitrogen concentration; soils were exposed to various drying- rewetting cycles at different gravimetric water contents (wt) under controlled conditions for a duration of 60 days. In total four treatments were conducted: soils under continuously moist conditions (control) at 32 wt; soils received short drying-rewetting cycles (SDWC) of between 32 to 21 wt; soils exposed to medium drying rewetting cycles (MDWC) of between 32 to 18 wt and a treatment with long drying-rewetting cycles (LDWC) of between 32 to 5 wt. Short medium and long drying-rewetting cycle treatments went through 6 4 and 2 drying-rewetting cycles (DWC) (0.1 0.07 and 0.03 drying-rewetting frequencies). Soil samples of arable and grassland soils were analyzed for NH4 and NO3 - at the different stages of incubation in order to compare changes over time. The results indicated that arable and grassland soils reduced N2 O-N flow in the long drying-rewetting treatments. For the grass soil the short drying-rewetting cycle treatment yielded the highest cumulative N2 O-N flow (325 g kg-1). In arable soil however the long drying-rewetting cycles receiving treatment released 69 less N2 O-N flow as compared to the other treatments. For the CO2 -C flow soils showed differing patterns with the shortly dried-rewetted cycle treatment of grassland soils yielding the highest (130 g kg-1) cumulative flow that was 25 higher than LDWC. Drying-rewetting cycles (DWC) on grass soils had no effect. The stressed treatments emitted only 19 higher CO2 -C flow than the control. The treatment with 5 (wt) successfully reduced N2 O-N flow in grassland and arable soils. Soil net nitrogen mineralization (NNM) and nitrification (NNN) rates of arable soils were significantly higher than in grassland soils.

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Item Type:	Article
AGROVOC Term:	Arable soils
AGROVOC Term:	Grassland soils
AGROVOC Term:	Nitrous oxide
AGROVOC Term:	Carbon dioxide
AGROVOC Term:	emission
AGROVOC Term:	Soil sampling
AGROVOC Term:	Climate chambers
AGROVOC Term:	Calibration
AGROVOC Term:	Soil analysis
AGROVOC Term:	Soil physicochemical properties
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:53
URI:	http://webagris.upm.edu.my/id/eprint/7763

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