| 白龙江上游不同林龄粗枝云杉人工林土壤化学计量特征 |
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| 引用本文： | 张珊,顾振东,陶继新,赵瑞桃,田晓娟,李文涛,安谈红.白龙江上游不同林龄粗枝云杉人工林土壤化学计量特征[J].西北林学院学报,2022,37(1):17-24. |
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| 作者姓名： | 张珊 顾振东 陶继新 赵瑞桃 田晓娟 李文涛 安谈红 |
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| 作者单位： | （甘肃兴隆山国家级自然保护区管护中心，甘肃 兰州 730117） |
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| 基金项目： | 国家自然科学基金(31800352);甘肃农业大学学科建设专项基金(GAU-XKJS-2018-097)。 |
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| 摘 要： | 以白龙江上游不同林龄（20、25、30、35、40、45 a）粗枝云杉人工林土壤为对象，采用野外取样法和室内分析法，测定不同深度（0~20 cm和20~40 cm）土壤的有机C、全N、全P、全K含量，并分析其化学计量特征，探讨林龄对云杉人工林土壤养分化学计量比的影响及其与土壤养分的相关性，以期通过调节土壤养分含量来提高系统的养分利用效率及云杉人工林的生产力，增强云杉人工林的水源涵养能力。结果表明:1）林龄和土层对云杉人工林土壤养分含量均有显著（P<0.05）影响。随林龄的增加土壤有机C含量呈“W”形变化，土壤全N、全P含量呈“N”形变化，30 a前的土壤养分较30 a后的养分含量低；相同林龄随土层增加土壤养分含量（除全K外）均呈现逐渐降低的趋势。2）林龄和土层深度对土壤C/N、C/P、C/K、N/P均有显著（P<0.05）的影响。除C/P之外，其他比值随林龄的增加均不稳定，变异系数较高；随土层深度的增加其比值（除N/P外）呈降低趋势。由化学计量比值大小得出，研究区土壤缺乏全N和全K，全 P含量较充足，云杉人工林在30 a之前受土壤P控制，30 a之后受土壤N控制。3）由相关性分析表明，随着土层深度的增加，土壤C、N、P、K、C/N、C/P、C/K、N/P之间的相关系数降低。有机C和全P是影响C/N、C/P、C/K、N/P的关键因子。
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| 关 键 词： | 化学计量比 土壤养分 云杉人工林 林龄 白龙江 |
Soil Ecological Stoichiometry of Spruce Plantation of Age Sequence in Upstream of Bailongjiang River |
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| ZHANG Shan,GU Zhen-dong,TAO Ji-xin,ZHAO Rui-tao,TIAN Xiao-juan,LI Wen-tao,AN Tan-hong.Soil Ecological Stoichiometry of Spruce Plantation of Age Sequence in Upstream of Bailongjiang River[J].Journal of Northwest Forestry University,2022,37(1):17-24. |
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| Authors: | ZHANG Shan GU Zhen-dong TAO Ji-xin ZHAO Rui-tao TIAN Xiao-juan LI Wen-tao AN Tan-hong |
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| Institution: | (Gansu Xinglongshan National Nature Reserve Management Center,Lanzhou 730117,Gansu,China) |
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| Abstract: | Soils of spruce(Picea asperata)plantations with different stand ages(20,25,30,35,40,and 45 a)occurring in the upper reaches of the Bailong River were taken as the research objects,the contents of organic carbon,total nitrogen,total phosphorus and total potassium in the soils with different depths(0-20 and 20-40 cm)were determined by field sampling and laboratory analysis methods,and their stoichiometric characteristics were analyzed.The aims of this study were to explore the effects of plantation age on the stoichiometric ratio of soil nutrient in spruce plantation and its correlation with soil nutrients,with a view to improve the nutrient use efficiency and the productivity of spruce plantation by adjusting the soil nutrient content,and enhance the water conservation ability of spruce plantation.The results were summarized as follows.1)The plantation age and soil depth presented significant influences on all the soil nutrients.With the increase of the plantation age,the variation of soil organic carbon presented a"W"shaped curve,and the soil total nitrogen,total phosphorus showed a"N"shaped curve.The nutrients in the soil of more than 30-year-old plantation were higher than those less than 30 years old.Except for the soil potassium,the contents of other elements in the soils of the spruce plantations with the same ages decreased with soil depth.2)The age of plantation and soil depth also presented significant influences on the ratios of soil C/N,C/P,C/K,N/P(P<0.05).Except for the C/P,the ratios of C/N,C/K,N/P decreased with the plantation age,but not stable,and the variation coefficients were higher.The results showed that in the study area,the total nitrogen and total potassium were deficient,and the total phosphorus was sufficient.Soil phosphorus was the controlling factor for the plantations less than 30 years old,while it was nitrogen for those less than 30 years old.3)The correlation coefficients among soil nutrients(C,N,P,and K)and among soil nutrient ratios(C/N,C/P,C/K,and N/P)decreased with soil depth.Organic carbon and phosphorus were the key factors influencing soil nutrient(C/N,C/P,C/K,N/P)ratios. |
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| Keywords: | stoichiometry characteristics soil nutrient spruce plantation plantation age Bailongjiang River |
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