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武夷山不同海拔梯度毛竹林土壤有机碳特征及影响因素
张厚喜1, 林丛1, 程浩1, 金昌善2, 徐自坤2, 魏志超1, 马祥庆1
1.福建农林大学林学院;2.武夷山国家公园管理局科研监测中心
摘要:
以武夷山自然保护区的毛竹林土壤(海拔范围为250 ~ 1 500 m)为研究对象,选取5个海拔梯度的15块样地,分析了毛竹林土壤有机碳沿海拔梯度的分布特征,探讨了土壤有机碳含量与地形因子、土壤性质的相关关系,并构建了土壤有机碳的回归模型。结果表明:①武夷山毛竹林土壤有机碳含量变化范围为13.29 ~ 70.68 g/kg,且海拔>500 m土壤有机碳的分布具有明显的表聚现象;②同一海拔高度内,毛竹林土壤有机碳含量呈现随土层深度的增加而逐渐降低的趋势,且其降幅也随之变小;③同一土层深度的土壤有机碳含量大体呈现随海拔的升高而增加的趋势,而其增幅则随之变小;④不同土层土壤有机碳含量与海拔均呈显著或极显著正相关、与容重均呈极显著负相关,而仅表层(0 ~ 10 cm)土壤有机碳含量与坡度呈显著负相关;⑤土壤有机碳多元线性回归模型的拟合优度高于一元线性回归模型,不同因子组合对不同土层有机碳含量变异的解释量介于59% ~ 83%。
关键词:  武夷山自然保护区  毛竹林  土壤有机碳  海拔梯度  多元线性回归模型
DOI:10.13758/j.cnki.tr.2019.04.025
分类号:S155.4+8
基金项目:福建省自然科学基金项目(2017J05042)和福建农林大学林学院科学基金计划项目(61201400822)资助。
Variation of Soil Organic Carbon Content of Moso Bamboo Forest Along Altitudinal Gradient in Wuyi Mountain in China
ZHANG Houxi1, LIN Cong1, CHENG Hao1, JIN Changshan2, XU Zikun2, WEI Zhichao1, MA Xiangqing1
1.College of Forestry,Fujian Agriculture and Forestry University;2.Scientific research monitoring center,Administration Bureau of National Park of Wuyi Mountain
Abstract:
In this study, the moso bamboo ( Phyllostachy edulis) forest soils from various altitudes (250 ~ 1 500 m) in Wuyishan Nature Reserve were chosen as the research object. The distribution characteristics of soil organic carbon were analyzed in 15 plots along five altitudinal gradients. The correlation between soil organic carbon content and topographic factors or soil properties was discussed, and the regression models of soil organic carbon were constructed. The results showed that: 1) The content of soil organic carbon varied from 13.29 g/kg to 70.68 g/kg, and the distribution of soil organic carbon at elevation >500 m was characteristic of obvious surface accumulation; 2) During the same altitude gradient, the content of soil organic carbon in the moso bamboo forest showed a decreasing trend with the increase of soil depth, and the decreasing amplitude declined accordingly; 3) Soil organic carbon content in the same soil depth generally increased with the altitude, but the increase rate decreased accordingly; 4) Soil organic carbon content in different soil layers was significantly positively correlated with altitude and negatively correlated with bulk density, and it was significantly negatively correlated with slope only in the surface layer (0–10 cm); 5) The goodness of fit of multiple linear regression model was higher than that of univariate linear regression model. The explanations of combination of different factors for the variation of organic carbon content in different soil layers ranged from 59% to 83%.
Key words:  National Nature Reserve of Wuyi Mountains  Moso bamboo forest  Soil organic carbon  Altitudinal gradient  Multivariable linear regression model

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