林隙大小对不同林型天然红松混交林土壤有机碳和全氮的影响  

Effect of gap size on soil organic carbon and total nitrogen in different types of natural Pinus koraiensis mixed forest

作　　者：段文标[1] 景鑫[1] 周美珩 陈立新[1] 龚建美 张玉双[1] 赵莹[1] 秦必达 

机构地区：[1]东北林业大学林学院,哈尔滨150040 [2]长兴化学材料(珠海)有限公司,广东珠海519000

出　　处：《生态学杂志》2015年第8期2077-2084,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31270666);黑龙江省自然科学基金项目(C201231和C20150573);人力资源与社会保障部留学回国人员科技活动择优启动项目(2012-258);东北林业大学大学生创新创业计划训练项目(201310225085和201410225158)资助

摘　　要：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）。Small, medium and large gaps in three forest types, Tilia amurensis-Pinus koraiensis mixed forest （ TP ）, Picea koraiensis-Abies fabri-Pinus koraiensis mixed forest （ PAP ）, Betula costata-Pinus koraiensis mixed forest （BP）, sponding closed stand around each gap was were selected as experimental plots, and its corre- set up as the controls in Xiaoxing＇ an Mountains of Northeast China. Soil organic carbon （SOC） and total nitrogen （TN） contents at the depth of 0- 10 cm in the different sized forest gaps and their controls of various forest types were determined from June to September in 2012, aiming to illustrate the effects of gap size on the variations in SOC and TN contents in different types of natural P. koraiensis mixed forest. The results showed that gap size had no significant effect on the SOC content in the three kinds of natural Korean pine mixed forest, while had significant effect on TN content only in PAP. The SOC and TN con- tents varied greatly with time in the three kinds of natural P. koraiensis mixed forest. SOC contentwas in order of large gap〉small gap〉medium gap, while TN content was in order of large gap〉 medium gap〉small gap in PAP and BP; SOC and TN contents were in order of medium gap〉 small gap〉large gap in TP. SOC content was higher in the gaps than in the closed stands of the three kinds of forest, while TN content was lower in the gaps than in the closed stands in TP and BP, and was in the opposite order in PAP. SOC and TN contents in the different forest types were ranked in the order of PAP〉TP〉BP and TP〉PAP〉BP, respectively. The variations in SOC and TN contents over months mostly presented a unimodal type of curve with the peak values in July or August, but TN peaked in September in PAP. The difference in C/N between different size gaps in the three kinds of natural P. koraiensis mixed forests was not significant. Our study pro- vides basic data for gap regeneration and sustainable management in natural P. koraiensis mixed forest in Xiaoxin

关 键 词：天然红松混交林 林隙 土壤有机碳 土壤全氮 

分 类 号：S718.55[农业科学—林学]