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间伐强度对落叶松人工林土壤有机碳的影响

2015-10-21王昌亮王庆成张程李雯张书娜

森林工程 2015年1期

王昌亮 王庆成 张程 李雯 张书娜

摘要:以山河屯林业局凤凰山抚育所40年生落叶松人工林为研究对象,采用不同强度的间伐处理(间伐0%(CK)、15%(T1)、40%(T2))后,研究不同土层土壤有机碳储量、活性有机碳(水溶性有机碳、微生物有机碳、易氧化碳)的变化。结果表明:间伐处理提高了土壤有机碳储量,表现为CK(12.92 Mg/hm2)0.05)。微生物有机碳和易氧化碳均主要集中在0~10 cm土层;不同处理间均为T2含量最高,分别为982.00、20.52 g/kg。水溶性有机碳在0~10 cm土层差异不显著,但在其他土层(10~20、20~40、40~60 cm)差异显著(P<0.05),不同处理间T2含量也均最高,由上到下不同土層水溶性有机碳分别为51.59、52.99、37.83和31.87 mg/kg。研究表明:15%的弱度间伐更有利于东北落叶松人工林土壤有机碳的固定。

关键词:落叶松(Larix gmelinii);人工林;间伐强度;土壤碳

中图分类号:S 753.7文献标识码:A文章编号:1001-005X(2015)01-0012-05

Effect of Thinning Intensity on Soil Organic

Carbon in Larix gmelinii Plantation

Wang Changliang,Wang Qingcheng,Zhang Cheng,Li Wen,Zhang Shuna

(School of Forestry,Northeast Forestry University,Harbin 150040)

Abstract:The 40yearold Larix gmelinii plantation in Phoenix Mountain Tending Institute of Shanhetun Forestry Bureau was studied in this paper.The soil organic carbon(SOC),water soluble organic carbon(WSOC),readily oxidizable carbon(ROC),microbial biomass carbon(MBC)in Larix gmelinii plantation with different thinning intensities(CK:control,T1:15% thinning intensity,T2:thinning intensity)were investigated.The results showed that thinning treatment increased the SOC storage,CK(12.92 Mg/ha2)0.05),respectively.MBC and ROC ware mainly concentrated in 0-10cm soil layer,and the highest content of T2 between different treatments,were 982.00 mg/kg and 20.52 g/kg.WSOC in 0-10cm soil layer was not significantly different among the treatments,but in other layers(10-20cm,20-40cm,40-60cm)showed significant difference(P<0.05).T2 between different treatments was the highest.WSOC of different layers from top to bottom were 51.59,52.99,37.83,and 31.87 mg/kg,respectively.In conclusion,15% intensity of thinning was more advantageous to the SOC sequestration of Larix gmelinii plantation in the northeast.

Keywords: Larix gmelinii;plantation;thinning intensity;soil carbon

收稿日期:2014-10-11

基金项目:国家“十二五”科技支撑项目(2011BAD37B02)

第一作者简介:王昌亮,硕士研究生。研究方向:土壤碳汇。

*通讯作者:王庆成,教授,博士生导师。研究方向:森林培育。Email:wqcnefu@163.com

引文格式:王昌亮,王庆成,张程,等.间伐强度对落叶松人工林土壤有机碳的影响[J].森林工程,2015,31(1):12-16.抚育间伐是一项重要的森林经营的措施,对提高森林生产力,增加森林土壤碳汇具有重要的作用[1]。研究表明间伐强度对土壤有机碳含量的影响存在明显的差异,方晰等(2004)对湖南杉木(Cunninghamia lanceolata)林研究表明,50 % 强度的间伐导致杉木人工林土壤有机碳含量降低16.14%。而李云红(2009)对东北落叶松(Larix gmelinii)人工林研究发现,与对照相比,25%和50%间伐强度林下土壤有机碳含量分别增加了6.97%和15.04%。此外,还有研究认为,间伐对土壤有机碳储量的变化不显著[2]。……

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