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赵芳,欧阳勋志.飞播马尾松林土壤有机碳空间分布及其影响因子.生态学报,2016,36(9):2637~2645 本文二维码信息
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飞播马尾松林土壤有机碳空间分布及其影响因子
Assessing relative contributions of various influencing factors to soil organic carbon in aerially-seeded Pinus massoniana plantations
投稿时间:2014-11-13  修订日期:2016-02-01
DOI: 10.5846/stxb201411132242
关键词土壤有机碳  影响因子  飞播马尾松林  增强回归树分析  兴国县
Key Wordssoil organic carbon  influencing factors  aerially-seeded Pinus massoniana plantations  boosted regression tree analysis  Xingguo County
基金项目国家自然科学基金项目(31160159,31360181)
作者单位E-mail
赵芳 江西农业大学林学院, 南昌 330045  
欧阳勋志 江西农业大学林学院, 南昌 330045 oyxz_2003@hotmail.com 
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摘要:
以飞播马尾松林为研究对象,通过典型样地调查和样品测定,采用简单相关分析和增强回归树分析(Boosted regression tree analysis: BRT)相结合的方法分析地形、林分、土壤以及林下植被条件对飞播马尾松林土壤有机碳的影响。结果表明:飞播马尾松林0-10cm、10-20cm土层有机碳含量的平均值分别为10.22g/kg和6.64g/kg,土壤有机碳含量随土层的加深而降低,两土层有机碳含量的变异系数分别为59.5%和60.1%,均属于中等程度变异。土壤有机碳含量主要受土壤条件的影响,其次为林分条件、地形条件和林下植被条件,土壤、林分、地形和林下植被条件对0-10cm土层有机碳含量的相对影响力分别为63.4%,19.3%,10.9%和6.4%,对10-20cm土层的相对影响力分别为60.4%,21.9%,10.6%和7.1%。全氮和全磷是影响土壤有机碳含量的主要因子,对0-10cm土层有机碳含量影响最大的因子是全氮,其相对影响力为40.2%,对10-20cm土层有机碳含量影响最大的因子是全磷,相对影响力为31.2%;全氮、全磷和平均胸径与两土层有机碳含量均呈显著正相关,林分密度和土壤容重与0-10cm土层有机碳含量呈显著负相关,坡向与0-10cm土层有机碳含量则表现为越向阳坡有机碳含量越高的规律,其他影响因子与土壤有机碳的相关性不显著。
Abstract:
Influencing factors of soil organic carbon were more focus on national-scale to landscape-scale in the previous studies, while studies based on fine-scale such as stand-scale were less. Analysing the spatial distribution characteristics of soil organic carbon and assessing relative contributions of various influencing factors to soil organic carbon in stand-scale can provide a theoretical basis for the ecosystem carbon sink research and forest management. By using the the data of typical plots investigation which including 50 sample plots with area of 20 m × 20 m and sample determination, combining simple correlation analysis and boosted regression tree analysis, the relative contributions of possible influencing factors, including topography, stand characteristics, soil property and understory vegetation conditions to soil organic carbon content were evaluated in the aerially-seeded Pinus massoniana plantations in this study. Our results showed that the average soil organic carbon content in the aerially-seeded Pinus massoniana plantations was 10.22 g/kg at a soil depth of 0-10 cm and 6.64 g/kg at 10-20 cm, respectively. Soil organic carbon content decreased with soil depth. Coefficients of variation of soil organic carbon in those two soil layers were 59.5% and 60.1%, respectively, which belonged to moderate variation. The relative influence of soil property, stand characteristics, topography and understory vegetation conditions on soil organic carbon at the soil depth of 0-10 cm were 63.4%, 19.3%, 10.9%, and 6.4%, and were 60.4%, 21.9%, 10.6%, and 7.1% at the soil depth of 10-20 cm, which indicated that soil organic carbon contents were mainly affected by soil property conditions, followed by stand characteristics, topography, and understory vegetation conditions. Total nitrogen and total phosphorus were the main factors influencing soil organic carbon content, of which, total nitrogen had the largest contribution to soil organic carbon content at the soil depth of 0-10 cm, with a relative influence of 40.2%, while total phosphorus was the most important factor on soil organic carbon content at the soil depth of 10-20 cm, with a relative influence of 31.2%. The results of correlation significance test in simple correlation analysis and the fitting curve in boosted regression tree analysis all showed that total nitrogen, total phosphorus, and average diameter at breast height had significant positive correlations with soil organic carbon content at the two soil layers. Stand density and soil bulk density had significant negative correlations with soil organic carbon content at the depth of 0-10 cm. In addition, soil organic carbon content at the depth of 0-10 cm was higher in the place which more exposed to the sun. The other influencing factors related to soil organic carbon were not significant.
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