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

发布时间：2018-03-03 08:05

本文选题：森林土壤　切入点：有机碳　出处：《北京林业大学学报》2017年02期 　论文类型：期刊论文

【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CO_2。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。
[Abstract]:The effects of sieve treatment on soil organic carbon (SOC) mineralization of broadleaved secondary forest and primeval Korean pine forest in Xiaoxinganling were studied by means of indoor culture. The soil organic carbon mineralization rate and accumulated mineralization amount were measured, and the soil cold water extraction of carbohydrates (CWECs) and hot water extraction of carbohydrates (HWEC) before and after culture were carried out. The first order kinetic model was used to fit the soil organic carbon mineralization parameters: latent. In mineralizable carbon (C0), easily mineralized organic carbon (C1), etc. The relationship between soil cm, cold water extraction of carbohydrate and hot water extraction of carbohydrate was analyzed. The results showed that the rate of soil organic carbon mineralization and cm of broadleaved secondary forest were higher than that of the original Korean pine forest. Types of soil organic carbon mineralization rate and accumulation increased, The increase of soil organic carbon mineralization in 1 mm sieve soil was greater than that in 2 mm sieve soil. The effect of sieve treatment on soil organic carbon mineralization rate of two forest types decreased with the increase of culture time, but the effect of sieve treatment on soil C0 was not significant. But soil C1 was increased by 49.09% in 2 mm sieve soil, and the C1 in 1 mm sieve soil was increased by 91.033.83%. The soil CWEC was increased by sieving treatment, but it had no effect on HWEC. The initial content and change amount of CWEC and HWEC in soil cm were positively correlated with each other. The results show that water extraction of carbohydrates is a key component of soil organic carbon mineralization, and the loss of carbohydrates can explain to a large extent the CO2s released by soil mineralization. Release some carbohydrates from cemented aggregates and increase soil organic carbon mineralization.
【作者单位】：东北林业大学林学院;
【基金】：“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)
【分类号】：S714.2

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