| 喀斯特高原山地区主要人工林土壤生态化学计量特征 |
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| 引用本文： | 王璐,喻阳华,邢容容,秦仕忆.喀斯特高原山地区主要人工林土壤生态化学计量特征[J].南方农业学报,2017,48(8). |
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| 作者姓名： | 王璐 喻阳华 邢容容 秦仕忆 |
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| 作者单位： | 1. 贵州师范大学 地理与环境科学学院,贵阳,550025;2. 贵州师范大学 喀斯特研究院,贵阳,550001;3. 贵州大学 资源与环境工程学院,贵阳,550025 |
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| 摘 要： | 【目的】探究喀斯特高原山地区主要人工林土壤碳(C)、氮(N)、磷(P)、钾(K)含量及生态化学计量特征,为揭示喀斯特高原山地区土壤养分限制状况、植被恢复和生态系统重建提供参考。【方法】在贵州省毕节市撒拉溪示范区内选取刺梨林(Rosa roxburghii)、核桃林(Juglans regia)和裸地进行野外定点取样,结合室内分析方法对3种人工林样地不同深度的土壤化学性质进行分析比较。【结果】3种人工林样地的有机C、全N、碱解N、全P和速效P含量总体上随土层深度的增加呈递减趋势,全K和速效K含量在不同深度土层间变化不显著(P0.05)或略有增减,养分总体上呈表层聚集性。土壤C/N、C/P、C/K、N/P、N/K和P/K均表现出一定的差异性,不同深度土层的C/N均以刺梨林最高,C/P表现为刺梨林裸地核桃林,C/K均随土层深度增加呈递减趋势,N/K和P/K均表现为核桃林裸地刺梨林。刺梨林、核桃林和裸地土壤生态化学计量特征的变异系数分别为11.14%~31.25%、5.59%~17.14%和6.82%~23.71%。相关性分析结果表明,有机C含量与全N含量、全P含量、C/K、N/K,全N含量与全P含量、C/K、N/K,全P含量与C/K、N/K,全K含量与N/P及C/K与N/K均呈极显著正相关(P0.01,下同);全N含量与全K含量、C/N,全P含量与全K含量、C/N、N/P,全K含量与C/K、N/K及C/N与N/K均呈极显著负相关。【结论】不同人工林样地的土壤养分分配均受土层深度影响,主要聚集在表层,N和P含量处于亏缺状态;生态化学计量比总体上为表层显著高于底层,土壤养分对其贡献存在差异。
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| 关 键 词： | 人工林 土壤养分 生态化学计量 喀斯特高原山地区 |
Ecological stoichiometry characteristics of soils from main plantations in karst plateau mountainous area |
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| WANG Lu,YU Yang-hua,XING Rong-rong,QIN Shi-yi.Ecological stoichiometry characteristics of soils from main plantations in karst plateau mountainous area[J].Journal of Southern Agriculture,2017,48(8). |
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| Authors: | WANG Lu YU Yang-hua XING Rong-rong QIN Shi-yi |
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| Abstract: | Objective]This study aimed to explore contents of carbon(C),nitrogen(N),phosphorus(P)and potassium (K)as well as ecological stoichiometry characteristics in soils from major plantations in karst plateau mountainous areas in order to provide reference for investigating soil nutrients limitation,vegetation restoration and ecosystem reconstruc-tion.Method]Rosa roxburghii plantation,Juglans regia plantation and bare land in Salaxi demonstration region,Bijie were sampled in field. Soil chemical properties from the three plantations at different soil depths were compared by indoor analysis.Result]Contents of soil organic carbons(SOC),total nitrogen(TN),available nitrogen(AvN),total phospho-rus(TP)and available phosphorus(AvP)decreased as a whole as soil depths increased. Total potassium(TK)content and available potassium(AvK)content changed among various soil depths,but the variations were insignificant(P>0.05). Overall,the nutrients accumulated in surface layers. Soil C/N,C/P,C/K,N/P,N/K and P/K ratios presented some differen-ces. C/N ratios of soil at different depths were the highest in R. roxburghii. The rank of C/P ratios in soils was R. rox-burghii>bare land>J. regia. C/K ratios decreased with the increase of soil depth. The performances of N/K and P/K ratio were J. regia>bare land>R. roxburghii. Variation coefficients of soil ecological stoichiometry characteristics for R. rox-burghii,J. regia and bare land were 11.14%-31.25%,5.59%-17.14%and 6.82%-23.71%respectively. Correlation analy-sis showed that significant positive correlation was found between SOC content and TN content,TP content,C/K ratio and N/K ratio;between TN content and TP content,C/K ratio and N/K ratio;between TP content and C/K ratio,N/K ra-tio;between TK content and N/P ratio and between C/K ratio and N/K ratio(P<0.01,the same below). However,there was extremely significant negative correlation between TN content and TK content,C/N ratio;between TP content and TK content,C/N ratio and N/P ratio;between TK content and C/K ratio,N/K ratio and between C/N ratio and N/K ratio.Conclusion]Soil nutrient distributions in different plantation sample plots are all affected by soil depth,the nutrients are mainly accumulated in surface layers with low N and P concentrations in these soils. In general,the ecological stoichio-metric ratios of soils from surface are higher than those from sub-layer soil,and soil contributions to it is different. |
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| Keywords: | plantation soil nutrient ecological stoichiometry karst plateau mountainous area |
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