Abstract Forest soils in the northeastern United States store considerable amounts of carbon (C). With the increasing utilization of biomass as a “C-neutral” form of energy in the United States, these forests are susceptible to clear cutting and large losses of soil organic matter (SOM) to the atmosphere as carbon dioxide (CO2). The relative stability versus susceptibility of SOM to degradation can be approximated, in part, through the strength of organo-mineral interactions, that is, the strength of binding between SOM and mineral surfaces in the soil. This study investigated differences in SOM organo-mineral binding between northern hardwood forest stands with varying clear-cutting histories in Bartlett Experimental Forest in Bartlett, New Hampshire. Sequential chemical extractions were performed to quantify SOM storage in organo-mineral pools of various binding strength. In this case study, soils from Mature forest stands stored significantly more SOM in strongly mineral-bound and stable C pools than soils from Cut stands did. Differences in the relative distribution of C in organo-mineral pools in Mature and Cut forests may inform our understanding of SOM bioavailability, microbial decomposition, and CO2 production in ecosystems after clear cutting. These findings should contribute to discussions on long-term SOM stability in northeastern U.S. soils.

中文翻译：

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在北部硬木林中清除砍伐后强束缚 SOM 池损失的证据

摘要 美国东北部的森林土壤储存了大量的碳 (C)。随着美国越来越多地利用生物质作为“碳中性”形式的能源，这些森林容易遭到砍伐，土壤有机质 (SOM) 以二氧化碳 (CO2) 形式大量流失到大气中。SOM 降解的相对稳定性与敏感性可以部分地通过有机矿物相互作用的强度来近似，即 SOM 与土壤中矿物表面之间的结合强度。这项研究调查了新罕布什尔州巴特利特的巴特利特实验森林中具有不同砍伐历史的北部硬木林分之间 SOM 有机矿物结合的差异。进行顺序化学提取以量化不同结合强度的有机矿物池中的 SOM 储存。在这个案例研究中，与来自切割林分的土壤相比，来自成熟林分的土壤在强矿物结合和稳定的 C 库中储存了更多的 SOM。成熟林和砍伐林有机矿物库中 C 相对分布的差异可能有助于我们了解砍伐后生态系统中 SOM 的生物利用度、微生物分解和 CO2 产生。这些发现应该有助于讨论美国东北部土壤中 SOM 的长期稳定性。成熟林和砍伐林有机矿物库中 C 相对分布的差异可能有助于我们了解砍伐后生态系统中 SOM 的生物利用度、微生物分解和 CO2 产生。这些发现应该有助于讨论美国东北部土壤中 SOM 的长期稳定性。成熟林和砍伐林有机矿物库中 C 相对分布的差异可能有助于我们了解砍伐后生态系统中 SOM 的生物利用度、微生物分解和 CO2 产生。这些发现应该有助于讨论美国东北部土壤中 SOM 的长期稳定性。