| 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 |
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| 引用本文： | 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. |
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| 作者姓名： | 高菲 林维 崔晓阳 |
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| 作者单位： | 东北林业大学林学院 |
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| 基金项目： | "十二五"国家科技支撑计划项目，"973"国家重点基础研究发展计划项目，中央高校基本科研业务费专项 |
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| 摘 要： | 采用室内培养法研究了过筛处理对小兴安岭阔叶次生林和原始红松林土壤有机碳(SOC)矿化的影响，测定了土壤有机碳矿化速率和累积矿化量(Cm)，以及培养前后土壤冷水提取碳水化合物(CWEC)和热水提取碳水化合物(HWEC)，利用一级动力学模型拟合土壤有机碳矿化参数:潜在可矿化碳(C0)、易矿化有机碳(C1)等，并分析了土壤Cm与冷水提取碳水化合物和热水提取碳水化合物的关系。结果表明:阔叶次生林土壤有机碳矿化速率和Cm均大于原始红松林。过筛处理使2种森林类型土壤有机碳矿化速率和累积矿化量增加，其中1 mm过筛土壤有机碳矿化增加量大于2 mm过筛土。过筛处理对2种森林类型土壤有机碳矿化速率的影响随着培养时间延长而减小。过筛处理对土壤C0无影响，却使土壤C1增加，其中2 mm过筛土C1增加49.09%~68.06%，1 mm过筛土C1增加91.03%~133.83%。过筛处理使土壤CWEC增加，但对HWEC无影响。土壤Cm与CWEC和HWEC的初始含量及变化量均呈极显著正相关，表明水提取碳水化合物是土壤有机碳矿化的关键组成部分，碳水化合物的损耗可以在很大程度上解释土壤矿化释放的CO2。综上，过筛处理破坏土壤结构，释放出部分胶结团聚体的碳水化合物，增加土壤有机碳矿化。
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| 关 键 词： | 森林土壤 有机碳 矿化 碳水化合物 过筛 |
| 收稿时间： | 2016-03-22 |
Effects of sieving process on soil organic carbon mineralization for two forest types in Xiaoxing ' an Mountains,Northeast China |
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| GAO Fei,LIN Wei,CUI Xiao-yang.Effects of sieving process on soil organic carbon mineralization for two forest types in Xiaoxing ' an Mountains,Northeast China[J].Journal of Beijing Forestry University,2017,39(2):30-39. |
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| Authors: | GAO Fei LIN Wei CUI Xiao-yang |
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| Institution: | School of Forestry, Northeast Forestry University, Harbin, Heilongjiang, 150040, P. R. China |
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| 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. |
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| Keywords: | forest soil organic carbon mineralization carbohydrate sieving |
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