Effect of Decomposition on Nitrogen Dynamics in Soil Applied with Compost and Rye

Abstract

Soil organic matter (SOM) plays an important role in the continuous production and environmental conservation in arable soils. In particular, the decomposition of organic matter in soil might promote soil organic matter and fertility due to the mineralization of N. In this study, to evaluate the effect of organic matter amendment on the C mineralization and N dynamic, CO 2 -C flux, extractable N and N 2 O emission were determined using closed chamber for 4 weeks at 10, 15, 20°C of incubation temperature after the mixture of 2 Mg ha -1 rice straw compost and rye in sandy loam and clay loam. Regardless of soil texture, decomposition rates of rice straw compost and rye at 10~20°C of incubation temperature ranged from 0.9 to 3.8% and 8.8 to 20.3%, respectively. Rye application in soil increased NH 4 -N and NO 3 -N content as well as the N 2 O emission compared to the rice straw compost. After incubation for 4 weeks, total C content in two soils was higher in rice straw compost than in rye application. In conclusion, application of rice straw compost and rye to soil was able to improve the soil organic matter and fertility. However, organic matter including the recalcitrant compounds like rice straw compost would be effective on the management of soil organic matter and the reduction of greenhouse gases in soil.Key words: Soil organic matter, Soil respiration, Mineralization, N dynamic Total CO2 fluxes in sandy loam (A) and clay loam (B) by rice straw compost and rye application under closed chamber condition with air-temperature levels.

Effect of Soil Respiration on Light Fraction-C and N Availability in Soil Applied with Organic Matter

“…그러나 이 · 난분해 성 함량과 C/N비 등의 유기물 특성은 미생물 활성, 탄소와 질소의 무기화, 양분유효도의 차이를 발생시킬 수 있다 (Kramer et al, 2002;Ko et al, 2015;Kim et al, 2015 용액에 뜨는 토양입자와 유기물을 light fraction (LF), 침전된 것을 heavy fraction으로 구분한다 (Sohi et al, 2001). 미생 물이 이용하는 탄소 및 질소기질은 대부분 LF에 포함되어 있 으며, 토양유기물 중 LF의 양과 C/N비는 토양호흡량과 높은 상관관계를 나타낸다 (Janzen et al, 1992;Wander et al, 1994;Gregorich and Janzen, 1996 , 2007).…”

Changes of Soil Organic Carbon in Forest and Arable Soil Under Different Altitude Levels

“…또한 농경지는 경운 및 비료 시용으로 SOC 변동에 영향을 미치기도 한다 (Janzena et al, 1998: Six et al, 2000 토양유기탄소 (SOC) 함량은 토양에 공급되는 유기물의 양과 탄질비 (CN)에 좌우되지만 (Teklay et al, 2007;Li et al, 2008), 미생물 활성과 기질이용성에 영향을 받기도 한다 (Anderson and Nilsson, 2001). 특히 토양온도와 pH는 미생물 활성과 밀절합 관계를 가지며 (Lee et al, 2008), 특히 미생물 활성에 의해 탄소와 질소의 기질이용성을 높아지 는 것으로 알려져 있다 (Ko et al, 2015). 량을 회귀식으로 예측하였다 (Fig.…”