间伐强度对落叶松人工林土壤有机碳的影响  

Effect of Thinning Intensity on Soil Organic Carbon in Larix gmelinii Plantation

作　　者：王昌亮[1] 王庆成[1] 张程[1] 李雯[1] 张书娜[1] 

机构地区：[1]东北林业大学林学院,哈尔滨150040

出　　处：《森林工程》2015年第1期12-16,共5页Forest Engineering

基　　金：国家"十二五"科技支撑项目(2011BAD37B02)

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,由上到下不同土层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。The 40-year-old 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） T2（ 15. 82 Mg/ha2） T1（ 17. 87 Mg/ha2）. Compared with the control,the thinning treatment increased the SOC storage by22. 41%（ P 0. 05） and 12. 98%（ P 0. 05）,respectively. MBC and ROC ware mainly concentrated in 0- 10 cm soil layer,and the highest content of T2 between different treatments,were 982. 00 mg / kg and 20. 52 g / kg. WSOC in 0- 10 cm soil layer was not significantly different among the treatments,but in other layers（ 10- 20 cm,20- 40 cm,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.

关 键 词：落叶松(Larix gmelinii) 人工林 间伐强度 土壤碳 

分 类 号：S753.7[农业科学—森林经理学]