北京林业大学学报2017，Vol.39Issue(2)：30-39,10.DOI:10.13332/j.1000--1522.20160100
过筛处理对小兴安岭2种森林类型土壤有机碳矿化的影响
Effects of sieving process on soil organic carbon mineralization for two forest types in Xiaoxing ' an Mountains, Northeast China
摘要
Abstract
We explored the effects of sieving process on soil organic carbon ( SOC ) mineralization in broad-leaved secondary forest and virgin Korean pine forest in the Xiaoxing' an Mountains by using incubation method. The SOC mineralization rate, cumulative SOC mineralization ( Cm ) , and the content of cool water extractable carbohydrate ( CWEC ) and hot water extractable carbohydrate ( HWEC ) before and after incubation were measured; the simultaneous reaction model was employed to estimate SOC mineralization parameters including soil easily mineralizable C ( C1 ) and potentially mineralizable C (C0);the correlations between Cm, CWEC and HWEC were also analyzed. Results showed that both the mineralization rate and Cm of SOC in the broadleaved secondary forest were greater than the ones in the virgin Korean pine forest. Both the mineralization rate and Cm of SOC in two forests were increased by sieving process, and Cm in the soil sieved to 1 mm was increased more than that in the soil sieved to 2 mm. The sieving process had a decreasing impact on the mineralization rate of SOC in the two forest types as the incubation time increased, while it had little impact on C0 but did increase C1 by 49. 09% -68. 06% in 2 mm sieved soil and 91. 03% -133. 83% in 1 mm sieved soil. The sieving process increased the CWEC, but had no effect on the HWEC. Significantly positive correlations had been observed between the Cm and both the initial and changed contents of CWEC and HWEC, indicating that water extractable carbohydrate was the key factor for the mineralization of the organic carbon in soil, and that the loss of carbohydrates could largely explain the CO2 released during the soil organic carbon mineralization. In conclusion, the sieving process could destroy the soil structure, release some carbohydrates from soil aggregates, and increase the mineralization level of the organic carbon in soil.关键词
森林土壤/有机碳/矿化/碳水化合物/过筛Key words
forest soil/organic carbon/mineralization/carbohydrate/sieving分类
农业科技引用本文复制引用
高菲,林维,崔晓阳..过筛处理对小兴安岭2种森林类型土壤有机碳矿化的影响[J].北京林业大学学报,2017,39(2):30-39,10.基金项目
"十二五"国家科技支撑计划项目(2011BAD37B01)、"973"国家重点基础研究发展计划项目(2011CB403202)、中央高校基本科研业务费专项(2572016AA06). （2011BAD37B01）
