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通过土壤样品的室内培养,运用三库一级动力学理论,分析了沼泽土、草甸土、普通黄棕壤和棕色石灰土4种土壤有机碳库容大小、各碳库平均周转时间及分解动态。结果表明,4种土壤剖面表层和中层有机碳含量分别为8.48~24.53 g/kg,4.02~16.77 g/kg;活性碳占总有机碳含量的0.99%~5.01%,1.31%~1.91%,平均周转时间分别为8.8~14.3 d,10.4~16.5 d;缓效性碳占总有机碳含量的15.88%~59.04%,20.43%~48.36%,平均周转时间分别为1.3~29.1 a,3.6~21.3 a;惰性碳占总有机碳含量的39.97%~79.11%,50.31%~77.66%。不同类型土壤三库有机碳含量均是上层明显大于中层,培养3个月,表层和中层土壤有机碳累计分解量分别达到了165.99~2 429.57 mg/kg,108.04~743.02 mg/kg,4种土壤有机碳分解速率大小顺序:沼泽土>草甸土>棕色石灰土>普通黄棕壤,与活性碳的百分比含量成正相关关系。对培养期间土壤有机碳累计释放量进行拟合,发现三次方程(Y=b0+b1x+b2x2+b3x3)能很好地描述其变化趋势,相关性均达到极显著水平(P<0.01)。
Based on the three-compartment first-order kinetics theory, the soil organic carbon storage capacity, the average turn-around time and the decomposition dynamics of carbon stocks in swamp soil, meadow soil, common yellow brown soil and brown lime soil were analyzed. . The results showed that the contents of organic carbon in the surface and middle layers of the four soil profiles were 8.48-24.53 g / kg and 4.02-16.77 g / kg, respectively. The contents of activated carbon in total organic carbon were 0.99% -5.01% and 1.31-191% The turnaround times were 8.8-14.3 d and 10.4-16.5 d respectively. The slow-acting carbons accounted for 15.88% -59.04% and 20.43% -48.36% of the total organic carbon content. The average turn-around time was 1.3-29.1 a and 3.6-21.3 a respectively ; Inert carbon accounted for 39.97% ~ 79.11%, 50.31% ~ 77.66% of the total organic carbon content. In the three types of soils, the contents of organic C in the three soils were significantly higher than those in the middle, and the total organic carbon decomposition in the surface and middle soils reached 165.99-2,249.57 mg / kg and 108.04-743.02 mg / kg, respectively, for 4 months Organic carbon decomposition rate of the order of magnitude: swamp soil> meadow soil> brown lime soil> ordinary yellow brown soil, and the percentage of activated carbon is positively correlated. The results showed that the cubic equation (Y = b0 + b1x + b2x2 + b3x3) could well describe its changing trend and the correlation reached the extremely significant level (P <0.01).