| 林分密度对华北土石山区油松人工林土壤有机碳及养分特征的影响 |
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| 引用本文： | 任丽娜,王海燕,丁国栋,高广磊,杨晓娟.林分密度对华北土石山区油松人工林土壤有机碳及养分特征的影响[J].干旱区地理,2012,35(3):456-464. |
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| 作者姓名： | 任丽娜 王海燕 丁国栋 高广磊 杨晓娟 |
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| 作者单位： | 教育部水土保持与荒漠化防治重点实验室,北京林业大学水土保持学院,北京100083 |
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| 基金项目： | 国家林业局林业公益性行业科研专项 |
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| 摘 要： | 以木兰围场国有林场管理局实施间伐后6种保留密度下（540、650、1 084、1 104、1 408和1 860 株 / hm2）油松人工林为研究对象，研究各土层的土壤有机碳和N、P、K等养分元素含量及其相关关系。研究结果显示：(1) 土壤有机碳含量和碳密度垂直递减特征明显，均随土壤深度的增加而显著减小，当林分密度由540 株 / hm2增加到1 860 株 / hm2时，土壤有机碳含量及碳密度变化规律不尽一致，其分布区间分别为10.56~21.21 g / kg，与5.48~11.70 kg / m2；(2) 林分密度对土壤有机碳及碳密度有显著的影响，1 408 株 / hm2油松林下土壤有机碳含量及碳密度分别与650 株 / hm2和1 860 株 / hm2油松林下土壤有机碳含量及碳密度呈显著性差异，而其它林分密度间无显著差异。当林分密度为1 104 株 / hm2时，各土层土壤全N和P、K的有效量及全量均保持在一个相对较高的水平，在0~60 cm深度土壤全N、全P、全K、有效P和速效K含量均值均达到最高，分别为1.38 g/kg、0.34 g/kg、32.75 g/kg、33.10 mg/kg和118.85 mg/kg；(3) 不同林分密度、不同土层土壤有机碳含量、碳密度与土壤全N及P、K的全量和有效量的相关显著性有差异，对整个土壤剖面而言，土壤有机碳含量及碳密度与土壤全N、全P、速效K均呈显著或极显著正相关；(4) 在本研究林分密度范围内，从林地土壤固碳的角度，建议将油松人工林的林分密度控制在1 104 株 / hm2。
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| 关 键 词： | 油松人工林 土壤有机碳 土壤有机碳密度 土壤养分 林分密度 |
| 收稿时间： | 2011-09-13; |
Effects of Pinus tabulaeformis Carr.plantation density on soil organic carbon and nutrients characteristics in rocky mountain area of northern China |
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| REN Li-na
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WANG Hai-yan
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DING Guo-dong
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GAO Guang-lei
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Yang Xiao-juan.Effects of Pinus tabulaeformis Carr.plantation density on soil organic carbon and nutrients characteristics in rocky mountain area of northern China[J].Arid Land Geography,2012,35(3):456-464. |
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| Authors: | REN Li-na WANG Hai-yan DING Guo-dong GAO Guang-lei Yang Xiao-juan |
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| Institution: | (Key Lab of Soil and Water Conservation and Desertification Combating,Ministry of Education, College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China) |
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| Abstract: | Soil is the common but precious natural resource that sustains the survival and development of human beings and our society.As a vital link of global carbon cycle,it is the largest carbon pool of terrestrial ecosystem.During the past two decades,Chinese government has been implementing an unprecedented large-scale afforestation program that played a key role on the cumulative carbon sequestration.Hence,it is of great importance to study the effects of forest management(e.g.thinning,stand density) on soil organic carbon(SOC) characteristics for mitigating climate changing effects.In this paper,we reported a thinning trial of Pinus tabulaeformis Carr.plantations and analyzed its effects on SOC and soil nutrients characteristics in Mulan-Weichang,Hebei Province of northern China.The Pinus tabulaeformis Carr.plantations with six densities(540,650,1 084,1 104,1 408,1 860 stem/hm2) after thinning were selected to study SOC content and density,soil nutrient contents and their correlations.As a prerequisite,site conditions including aspect,slope,slope position,etc,stand age of 40 years old,trees’growth status and forest management approaches were kept the same or similar before the thinning trial.Correlation analysis,single factor analysis of variance(ANOVA) and multiple comparisons were carried out with SPSS 18.0.The study indicated that as follows:(1) the SOC content and density was characteristic of vertically descending,both decreasing significantly with the increase of soil depth;the SOC content and density were not consistent when the stand density increased from 540 stem/hm2 to 1 860 trees/hm2,and ranged from 10.56 to 21.21 g/kg1,and from 5.48 to 11.70 kg/m2,respectively.(2) Stand density has significant effects on the SOC content and density.Significant differences were found for the Pinus tabulaeformis Carr.plantation at the density of 1 408 trees/hm2 with those of 650 and 1 860 trees/hm2,but there were no significant differences of the SOC content and density between the other stand densities.At the stand density of 1 104 trees/hm2,total N,P,K and available P,K contents were in relatively higher levels in the soil depth of 0-60 cm,and reached the maximum values of 1.38 g/kg,0.34 g/kg,32.75 g/kg,33.10 mg/kg and 118.85 mg/kg,respectively.(3) There were significant differences of correlations among the SOC content and density,total N,P,K and available P,K in the different depth at different stand densities;in the whole soil profile,the SOC content and density had very significant or significant positive correlations with total N,P and available K contents.(4) According to this study,the stand density of Pinus tabulaeformis Carr.plantation was suggested to be about 1 104 stem/hm2 for the soil carbon sequestration.The innovation and highlight of this paper is the discussion about the effects of stand density on forest SOC content and density. |
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| Keywords: | Pinus tabulaeformis Carr plantation soil organic carbon soil organic carbon density soil nutrients stand density |
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