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拱坝河流域5种森林类型土壤有机碳的分布特征
赵栋1,2, 权丽1,2, 屠彩芸1,2, 郭星1,2
1.白龙江林业管理局林业科学研究所, 甘肃 兰州 730070;2.甘肃白龙江森林生态系统国家定位观测研究站, 甘肃 舟曲 746300
摘要:
[目的] 研究拱坝河流域典型森林土壤有机碳含量和有机碳密度的分布特征,为深入推进森林多目标经营工作提供科学依据。[方法] 通过实地调查取样和室内实验测定。[结果] ①人工云杉林SOC含量平均为(32.5±21.82) g/kg,0—60 cm SOCD为(13.85±6.98) kg/m2;②不同土壤深度,土壤密度差异显著;随土壤深度增加,5种森林类型的土壤有机质,全N,全P,全K,有效P及速效K含量呈递减趋势。③0—60 cm土层含量与自然含水量,全N,全K,速效K均呈极显著或显著正相关,与土壤密度呈极显著负相关;SOCD与土壤理化性质表现出一致的相关性。[结论] 研究区不同森林类型土壌有机碳含量和有机碳密度受多种因素的影响,在林分结构、土壤理化特性、树种特性等多种因素的共同影响下,土壤有机碳和有机碳密度表现出明显的差异性。
关键词:  典型森林类型  土壤有机碳  土壤养分  拱坝河流域
DOI:10.13961/j.cnki.stbctb.2018.06.009
分类号:
基金项目:甘肃省自然科学基金项目“拱坝河流域典型森林类型土壤有机碳及养分空间异质性研究”(150RJZK179)
Distribution Characteristics of Soil Organic Carbon in Typical Forestlands in Drainage Basin of Gongba River
ZHAO Dong1,2, QUAN Li1,2, TU Caiyun1,2, GUO Xing1,2
1.Institute of Forestry Science, Bailongjiang Forestry Management Bureau of Gansu Provience, Lanzhou, Gansu 730070, China;2.Gansu Bailongjiang National Forest Ecosystem Research Station, Zhouqu, Gansu 746300, China
Abstract:
[Objective] The distribution characteristics of soil organic carbon (SOC) content and density (SOCD) in typical forests of Bailongjiang region were studied in order to provide a scientific basis for further promoting multi-objective forest management.[Methods] Field investigation, sampling and laboratory test were used.[Results] ① The mean SOC content of artificial spruce forest was (32.5±21.82) g/kg, and SOCD was (13.85±6.98) kg/m2 in the soil depth of 0-60 cm. ② The density of soil is significantly different in the different soil depths, and the content of soil organic matter, total N, total P, total K, effective P and K in five forest types showed a trend of decline with the increase of soil depth. ③ Content of soil in 0-60 cm layer was positively correlated with natural water content, total N, total K and effective K, while it had a significantly negative correlation with soil density. SOCD showed a consistent correlation with physicochemical properties of soil.[Conclusion] The content and density of SOC in the different forest types are affected by many factors in the study area. Under the influence of those factors such as stand structure, soil physical and chemical characteristics, and tree characteristics, the content and density of SOC showed a significant difference between the different forest types.
Key words:  typical forest type  soil organic carbon  soil nutrients  drainage basin of Gongba river