贵州脆弱生态区不同龄组马尾松人工林土壤团聚体稳定性与养分含量  

Soil aggregate stability and nutrient content of Pinus massoniana plantation at different age groups in fragile ecological area of Guizhou

作　　者：刘讯 石燕[1,2] 姚思雨 王娑娑 丁波 张运林 武燕 LIU Xun;SHI Yan;YAO Siyu;WANG Suosuo;DING Bo;ZHANG Yunlin;WU Yan(School of Biological Sciences,Guizhou Education University,Guiyang 550018,Guizhou,China;Key Laboratory of Forest Fire Ecology and Management of Guizhou Province,Guizhou Education University,Guiyang 550018,Guizhou,China)

机构地区：[1]贵州师范学院生物科学学院,贵州贵阳550018 [2]贵州师范学院贵州省高等学校林火生态与管理重点实验室,贵州贵阳550018

出　　处：《中南林业科技大学学报》2024年第8期104-113,共10页Journal of Central South University of Forestry & Technology

基　　金：贵州省科技计划项目(黔科合基础-ZK[2023]一般282);贵州师范学院校级博士基金项目(2020BS026);贵州省科技计划项目(黔科合基础-ZK[2023]一般286);贵州省教育厅平台项目([2022]051号)。

摘　　要：【目的】分析贵州脆弱生态区不同龄组马尾松Pinus massoniana人工林土壤团聚体分布、稳定性及养分含量特征,并探讨它们之间的关系。【方法】在贵州省遵义市凤冈县设置马尾松人工林中龄林样地3个、近熟林样地5个、成过熟林样地3个,用湿筛法获得不同粒径的土壤团聚体,计算其质量分数、平均质量直径(MWD)、几何平均直径(GMD),并测定团聚体中土壤有机碳(SOC)、全氮(TN)和全磷(TP)含量。【结果】1)三个龄组马尾松人工林土壤团聚体质量分数均随粒径减小而减少(P<0.05),而MWD和GMD在不同龄组之间无显著差异(P>0.05)。2)随着马尾松人工林龄组的增长,土壤团聚体SOC含量表现为先下降后上升的趋势,中龄林SOC含量显著高于近熟林和成过熟林(P<0.05),TN含量逐渐积累,近熟林和成过熟林TN含量显著高于中龄林(P<0.05),而TP含量逐渐消减,中龄林TP含量显著高于近熟林和成过熟林(P<0.05);随着土壤团聚体粒径的减小,团聚体SOC含量逐渐增加,黏粉粒和微团聚体中SOC含量显著高于大团聚(P<0.05),TN含量逐渐下降,大团聚体中TN含量显著高于黏粉粒(P<0.05)。3)大团聚体SOC含量及微团聚体TP含量与大团聚体分布、黏粉粒分布、MWD、GMD均表现显著的正相关关系(P<0.05);微团聚体SOC含量与大团聚体分布、黏粉粒分布、MWD、GMD均表现显著的负相关关系(P<0.05)。【结论】马尾松人工林龄组变化影响了土壤团聚体的分布和团聚体养分含量变化,且团聚体养分含量与团聚体分布及稳定性之间有显著的相关性。本研究可获得贵州脆弱生态区马尾松人工林团聚体分布、稳定性及养分的基础数据,对于该区域人工林土壤结构和抗侵蚀功能评价与森林管理具有重要意义。【Objective】The characteristics and relationship of soil aggregate distribution,stability and nutrient content were analyzed in Pinus massoniana plantation of age groups in fragile ecological area of Guizhou.【Method】3 middle-age forest,5 near-mature forest and 3 over-mature forest plots were set up in Fenggang county,Zunyi city,Guizhou province.Soil aggregates of different particle sizes were obtained by wet sieve method,and their mass fraction,mean mass diameter(MWD),geometric mean diameter(GMD)and soil organic carbon(SOC),total nitrogen(TN)and total phosphorus(TP)contents were calculated.【Result】1)The soil aggregate mass fraction reduced with the decrease of particle size in P.massoniana plantation of different age groups(P<0.05),while MWD and GMD were not significantly different among 3 age groups(P>0.05).2)With the increase of age group of P.massoniana plantation,SOC content of soil aggregates decreased first and then increased(P<0.05).TN content gradually accumulated,and the TN content in near-mature forest and over-mature forest was significantly higher than that of middle-age forest(P<0.05).TP content decreased gradually,and the TP content in middle-age forest and was significantly higher than that of near-mature forest and over-mature forest(P<0.05);As the particle size of soil aggregates decreases,SOC content of aggregates increases gradually,while the TN content decreased gradually.The SOC contents in clay particles and microaggregates were significantly higher than that in macroaggregates(P<0.05),and the TN content in macroaggregates was significantly higher than that in clay particles(P<0.05).3)The SOC content in macroaggregates and TP content in microaggregates were significantly positively correlated with the macroaggregates distribution,clay particle distribution,MWD and GMD(P<0.05);The SOC content of microaggregates was negatively correlated with the macroaggregates distribution,clay particle distribution,MWD and GMD(P<0.05).【Conclusion】The change of age groups of P.massoniana plant

关 键 词：马尾松人工林 团聚体分布 团聚体稳定性 团聚体养分 

分 类 号：S791.248[农业科学—林木遗传育种]