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在天然红松混交林3种不同林型(椴树红松混交林(TP)、云冷杉红松混交林(PAP)、枫桦红松混交林(BP))内,各选取小、中、大3个林隙,并分别以各自的郁闭林分作为对照,分析了2012年6—9月各林型不同大小林隙及其郁闭林分0~10 cm的土壤有机碳(SOC)和全氮(TN)含量,旨在阐明林隙大小对不同类型天然红松混交林土壤有机碳和全氮变化的影响,从而为小兴安岭林区天然红松混交林林隙更新和森林可持续经营提供基础数据。结果表明:在3种天然红松混交林内,林隙大小对SOC含量影响不显著;仅在PAP内,林隙大小对TN含量影响显著,在其他林型内均不显著;SOC、TN含量在3种林型内均呈现随月份不同差异显著的趋势(P<0.05),而且相同月份不同林型之间的SOC和TN含量均差异显著(P<0.05);PAP和BP林隙内SOC含量表现为大林隙>小林隙>中林隙,TN含量为大林隙>中林隙>小林隙,TP林隙内SOC、TN含量随林隙大小变化均为中林隙>小林隙>大林隙;SOC含量在3种林型内均表现为林隙内>郁闭林分,TN含量在TP和BP内均为林隙内<郁闭林分,PAP内却相反;SOC含量在不同林型林隙内的大小次序均为PAP>TP>BP,TN含量却为TP>PAP>BP;SOC、TN含量随月份变化大部分呈现单峰型曲线,在7或8月达到峰值,PAP林隙内TN含量在9月达到峰值;土壤碳氮比(C/N)在3个林型内不同大小林隙及郁闭林分之间均没有显著差异(P>0.05)。
In three different forest types (mixed forest of Pinus koraiensis, Mixed forest of Betula platyphylla, Mixed forest of Pinus koraiensis and Betula platyphylla) With three stand gaps respectively. The soil organic carbon (SOC) of 0 ~ 10 cm of different sizes of gaps and their closed stands in June to September in 2012 were analyzed. And total nitrogen (TN) content in the natural forests of Pinus koraiensis to clarify the effect of gap size on the changes of soil organic carbon and total nitrogen in different types of natural Korean pine mixed forests, so as to provide the theoretical basis for the gap regeneration and sustainable forest management of mixed natural Korean pine forests in the Xiaoxing’an Mountains Provide basic data. The results showed that in the natural mixed forest of Pinus koraiensis, the gap size had no significant effect on the SOC content. In the PAP alone, the gap size had a significant effect on the TN content but not in other forest types. The SOC and TN contents were There was a significant difference (P <0.05) between the three forest types with different months, and there was significant difference (P <0.05) between the SOC and TN content in different forest types in the same month. The SOC content The contents of TN and TN in groves> groves> middle groves> TN> middle grove> small groves and TN, respectively. The contents of SOC and TN in groves of TP were all in the order of middle grove> small grove> The content of SOC in the stands was> Kuaiyinlin> TN in three types of forest, TN content was both in the gap and within the PAP in both TP and BP, but the SOC content in the different forest types The order of the size of the gap was PAP> TP> BP, while the content of TN was TP> PAP> BP. The content of SOC and TN showed single peak curve with most of the changes in the month, reaching the peak in 7 or 8 months, TN content peaked in September. There was no significant difference in C / N ratio between different sizes of gap and canopy stand in the three forest types (P> 0.05).