李云红 邵英男 陈瑶 刘延坤 田松岩

摘 要：选择黑龙江丰林国家级自然保护区内的云冷杉红松林和蒙古栎红松林为研究对象，测定2种林型下土壤微生物生物量碳和土壤水溶性有机碳的含量，探讨不同森林植被对2种土壤活性有机碳含量的影响。结果表明：2种森林类型下2种土壤活性有机碳含量均表现出随土层加深而降低的趋势;土壤微生物生物量碳含量和土壤水溶性有机碳含量在2种林型间差异均不显著（P>0.05）。2种林型间土壤微生物生物量碳、土壤水溶性有机碳与土壤有机碳之比均表现为蒙古栎红松林高于云冷杉红松林;土壤碳密度云冷杉红松林显著高于蒙古栎红松林（P<0.05）。研究表明，在东北温带森林中，对于本研究所选取的由特定树种组成的云冷杉红松林和蒙古栎红松林，其土壤活性有机碳含量差异不显著，但活性有机碳占总有机碳比例蒙古栎红松林高于云冷杉红松林，即云冷杉红松林的土壤碳库稳定性较蒙古栎红松林好，土壤碳储量高。

关键词：云冷杉红松林;蒙古栎红松林;微生物生物量碳;水溶性有机碳;土壤有机碳密度

中图分类号：S714.2     文献标识码：A   文章编号：1006-8023（2021）03-0060-07

Abstract：The Picea sp.Abies sp.Pinus koraiensis forests （PAP） and Quercus mongolicaPinus koraiensis forests （QP） in the Heilongjiang Fenglin National Nature Reserve were selected as the research objects， the contents of soil microbial biomass carbon （MBC） and soil water soluble organic carbon （WSOC） were measured to discuss the effects of different forest vegetation on the content of soil labile organic carbon. The results showed： the content of two types of soil labile organic carbon under the two forest types decreased with soil depth deepening. There is no significant difference between PAP and QP in MBC and WSOC （P>0.05）. The ratio of MBC to soil organic carbon （SOC） and the ratio of WSOC to SOC in QP were higher than that of PAP. The soil organic carbon density （SOCD） in PAP was significantly higher than that of QP （P<0.05）. For the PAP and QP which were composed of specific tree species in Northeast temperate forest， the results showed that there was no significant difference in the content of soil labile organic carbon， but the ratio of soil labile organic carbon to total organic carbon in QP was higher than that of PAP， that meant the stability of soil carbon pool and soil carbon sequestration of PAP was better than that of QP.

Keywords：Picea sp.Abies sp.Pinus koraiensis forests; Quercus mongolicaPinus koraiensis forests; microbial biomass carbon; water soluble organic carbon; soil organic carbon density

0 引言

近年來，全球气候随二氧化碳（CO2）等温室气体浓度的增加出现了变暖的趋势，气候变化将导致植被分布区发生改变。针对小兴安岭阔叶红松林，有研究发现温度和CO2浓度升高提高了林分中阔叶树种的比例，甚至形成阔叶纯林[1-2]，这将改变此地区原有的地带性植被分布。植被分布通过其归还到土壤中的凋落物和根系分泌物的数量和质量而影响土壤中活性有机碳的含量。而土壤活性有机碳的变化能对土壤肥力的保持、养分供应、土壤碳收支以及全球变化产生响应[3-4]。目前，针对森林土壤活性有机碳我国已经开展了一些研究，王……