广西不同森林类型土壤有机碳的空间异质性

发布时间：2018-03-06 16:50

本文选题：土壤有机碳　切入点：空间异质性　出处：《广西植物》2017年11期 　论文类型：期刊论文

【摘要】：采用经典统计学和地统计学相结合的方法,研究广西10类主要森林类型不同土层(0~10、10~20、20~30、30~50、50~100 cm)土壤有机碳含量的空间异质性。结果表明:广西森林不同土层土壤有机碳平均含量变化为8.01~29.78 g·kg-1,变异系数在50.27%~74.89%之间;10~20 cm土层土壤有机碳的半变异函数符合球状模型,其余土层符合指数模型,且拟合效果均较好;各土层土壤有机碳半变异函数的块金效应为16.75%~49.33%,表现为强烈或中等强度的空间自相关性;Kriging插值结果显示,不同森林各土层土壤有机碳含量的分布具有一定相似的空间分布特征,总体表现为北高南低,最高和最低值分别出现在东北和东南;广西不同森林类型不同土壤深度土壤有机碳含量和变异系数不同,0~100 cm土壤有机碳平均含量的大小顺序为硬阔杉木石山林软阔竹林八角桉树油茶栎类松树,总体上土壤有机碳含量随土壤深度的增加而降低,变异系数则相反。广西森林土壤的空间异质性受结构性和人为因素的共同制约,其中结构性因素起主导作用。因此,加强自然林封育和人工林保育、优化调控桉树林和经济林种植规模是提高广西森林固碳潜力的重要措施。
[Abstract]:Using a combination of classical statistics and geostatistics, The spatial heterogeneity of soil organic carbon content in different soil layers of 10 main forest types in Guangxi was studied. The results showed that the average content of organic carbon in different soil layers of Guangxi forest was 8.01 ~ 29.78 g 路kg ~ (-1), and the coefficient of variation was between 50.27% and 74.89%. The semi-variation function of organic carbon in layered soil accords with the spherical model. The other soil layers fit the exponential model and the fitting results are good, and the block gold effect of soil organic carbon semi-variation function in each soil layer is 16.7575 and 49.33, showing strong or moderate intensity spatial autocorrelation and Kriging interpolation results. The distribution of soil organic carbon in different soil layers of different forests has some similar spatial distribution characteristics, the overall performance is that the north is high and the south is low, and the highest and lowest values appear in the northeast and southeast respectively. The soil organic carbon content and coefficient of variation of different forest types and different soil depth in Guangxi are different. The order of average organic carbon content of 100 cm soil is hard and broad Chinese fir, stone mountain forest, soft broad-leaved bamboo forest, eucalyptus, Camellia oleifera, Pinus oleifera, Pinus oleifera. Overall, the soil organic carbon content decreases with the increase of soil depth, but the coefficient of variation is opposite. The spatial heterogeneity of forest soils in Guangxi is restricted by both structural and human factors, among which structural factors play a leading role. It is an important measure to enhance the carbon sequestration potential of Guangxi forest to strengthen natural forest closure and artificial forest conservation and to optimize and regulate the planting scale of eucalyptus and economic forest.
【作者单位】：湖南农业大学农学院;中国科学院亚热带农业生态研究所重点实验室;中国科学院环江喀斯特农业生态系统研究观测站;
【基金】：国家重点研发计划项目(2016YFC0502405) 国家自然科学基金(31370485,31370623,31400412,31460135) 广西科技惠民项目(桂科转1599001-6) 广西重点研发计划项目(桂科AB16380255) 湖南省研究生科研创新项目(CX2015B231)~~
【分类号】：S714.2

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