子午岭人工油松林演替过程中土壤有机碳的积累与变化  

Accumulation and Change of Soil Organic Carbon in the Process of Succession of Pinus tabulaeformis Plantation in Ziwuling

作　　者：王发刚 殷恒霞[2] 陈开华[2] 刘俊英[2] 

机构地区：[1]青海省畜牧兽医职业技术学院,青海湟源812000 [2]青海师范大学生命与地理科学学院,青海西宁810008

出　　处：《安徽农业科学》2009年第26期12782-12784,共3页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金(30660120);三江源区科技支撑项目(2005-SN-2)资助

摘　　要：[目的]研究黄土高原子午岭油松林演替过程中土壤有机碳的积累与变化趋势,为制订该区域土地利用政策和新技术开发等土地可持续发展策略提供科学指导。[方法]采用空间代替时间序列方法,研究该地区人工植被与土壤有机碳积累和变化的相互关系,并用一元方差分析(ANOVA)检验各参数在各处理间的差异显著性。[结果]①随着油松人工林林龄的增加,地表枯枝落叶和腐殖质现存量逐渐增加,地表枯枝落叶C∶N比显著增加,各样地地表枯枝落叶C∶N比比腐殖质C∶N比高;②12年油松林土壤碳储量为10.12kg/m2,20年油松林土壤碳储量9.51 kg/m2,32年油松林土壤碳储量7.79 kg/m2,表明天然林砍伐后种植油松会导致土壤碳储量降低;③随着土壤深度的增加,土壤有机碳浓度逐渐降低,表层20 cm土壤中总有机碳储量为44.15%。[结论]在进行森林恢复过程中,需注意针叶、阔叶树种(或乔灌草)的搭配以及针叶树种对其他树种的排斥。[ Objective ] The aim was to study the accumulation and change trend of soil organic carbon in the process of succession of Pinus tabulaeformis plantation on Ziwuling in Loess Plateau, and provide scientific guidance for land sustainable development strategy about formula- ting land using policy in this region and developing new technology. [ Method] Using space instead of time series method, the relationship be- tween artificial vegetation and accumulation and change of soil organic carbon was researched, and the different significance of each parameter among treatments was tested by using ANOVA method. [ Result] （1） With the increase of forest age of P. tabulaeformis plantation, biomass of litter layer and humus layer increased gradually, C： N ratio in litter layer of litter layer increased significantly. In addition, C： N ratio in litter layer was much higher than that in humus layer; （2） Soil organic carbon contents were 10.12 kg/m2 in 12-year old forest, 9.51 kg/m2 in 20- year old forest and 7.79 kg/m： in 32-year old forest, respectively. The result showed that planting P. tabulaeformis after cutting natural forest, soil carbon content would decrease. （3） With the increase of soil depth, soil organic carbon concentration decreased gradually, the total organic carbon content was 45. 15% in 0 - 20 cm depth soil layer. [ Conclusion ] In the process of forest restoration, it must be noticed the matches between coniferous tree and broadleaf （or arbor, shrub and grass）, and coniferous tree excluded other trees.

关 键 词：油松人工林 演替 土壤碳含量 

分 类 号：S718.516[农业科学—林学]