CAJ | 학술논문

通过对松嫩平原玉米田土壤CO2排放的连续观测,研究连作玉米田土壤CO2排放规律及与土壤温度、土壤水分的关系,并计算玉米田土壤碳平衡特征.结果表明,玉米田土壤CO2排放通量呈现明显季节性,6~8月土壤CO2排放量较大,而在4和11月维持较低水平.秸秆还田处理(MTS)土壤CO2排放通量、最大通量和平均通量高于翻耕处理(CT).土壤CO2排放通量与地温呈显著正相关,指数方程表征二者关系效果最佳,线性方程效果最低,除个别情况,深层土壤拟合效果高于浅层土壤;MTS处理的土壤CO2排放通量与土壤温度相关性高于CT处理.土壤CO2排放通量与12 cm深度土壤水分相关性不显著.通过对秸秆、根茬还田碳与土壤CO2排放碳的测算, MTS处理秸秆还田碳量较CO2排放碳量平均每年多2 744.6 kg C·hm-2,呈碳汇效应;CT处理秸秆还田碳量较CO2排放碳量平均每年少810.4 kg C·hm-2,呈碳源效应.
통과대송눈평원옥미전토양CO2배방적련속관측,연구련작옥미전토양CO2배방규률급여토양온도、토양수분적관계,병계산옥미전토양탄평형특정.결과표명,옥미전토양CO2배방통량정현명현계절성,6~8월토양CO2배방량교대,이재4화11월유지교저수평.갈간환전처리(MTS)토양CO2배방통량、최대통량화평균통량고우번경처리(CT).토양CO2배방통량여지온정현저정상관,지수방정표정이자관계효과최가,선성방정효과최저,제개별정황,심층토양의합효과고우천층토양;MTS처리적토양CO2배방통량여토양온도상관성고우CT처리.토양CO2배방통량여12 cm심도토양수분상관성불현저.통과대갈간、근치환전탄여토양CO2배방탄적측산, MTS처리갈간환전탄량교CO2배방탄량평균매년다2 744.6 kg C·hm-2,정탄회효응;CT처리갈간환전탄량교CO2배방탄량평균매년소810.4 kg C·hm-2,정탄원효응.
Through this experiment Songnen Plain corn field soil CO2 emissions was observed continuously, we study corn field soil CO2 emissions law as wel as the relationship between soil temperature and soil moisture; And compared straw, and calculate the characteristics of corn field soil carbon balance. The results showed that corn field soil CO2 fluxes showed significantly seasonal and there was a large amount of soil CO2 emissions in June, July and August, while maintaining a relatively low level in April and November. Straw processing (MTS) of soil CO2 flux, maximum throughput and average throughput was higher than conventional til age (CT). Soil CO2 flux and soil temperature showed significantly positive correlation, the exponential equations showed the best effect, linear equations showed the lowest effect, with the exception of productivity, deep soil was better than shal ow soil fitting;Soil CO2 MTS handled emission flux and soil temperature correlation was higher than CT treatment. Soil CO2 flux correlation between 12 cm depth of soil moisture was not significant. Through the straw, stubble to field soil carbon and CO2 emissions of carbon estimates, MTS processing straw carbon content were more than the average CO2 emissions per year 2 744.6 kg C·hm-2, showed carbon sink effect;CT processing straw carbon content were less than the average CO2 emissions per year less 810.4 kg C·hm-2, showed carbon sources effect.