红壤侵蚀区不同植被类型土壤磷垂直分布特征及影响因素研究  

Study on Vertical Distribution Characteristics and Influencing Factors of Soil Phosphorus in Different Vegetation Types in Red Soil Erosion Area

作　　者：梁晶晶 王淑真 丘伟娟 王丽平 包明琢 周垂帆[1,2] LIANG Jingjing;WANG Shuzhen;QIU Weijuan;WANG Liping;BAO Mingzhuo;ZHOU Chuifan(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002;Changting National Positioning Observation and Research Station of Red Soil Hill Ecosystem,Changting,Fujian 366301)

机构地区：[1]福建农林大学林学院,福州350002 [2]福建长汀红壤丘陵生态系统国家定位观测研究站,福建长汀366301

出　　处：《水土保持学报》2023年第3期208-217,共10页Journal of Soil and Water Conservation

基　　金：国家林草局定位站运行经费项目(K4315002A);福建农林大学林学高峰学科建设项目(72202200205)。

摘　　要：为探讨红壤侵蚀区不同植被类型下土壤磷素有效性,选取福建长汀红壤丘陵生态系统国家定位观测研究站的裸地(CK)、针叶林(CF)、针阔混交林(CB)以及阔叶林(BF)4种植被类型,分别测定其铁氧化物、各级磷素形态,并采用高通量测序技术对解磷菌(PSM)进行测定。结果表明:随着植被类型的转变,中等活性磷含量增加,低活性磷含量总体上减少,游离态氧化铁(Fed)含量逐渐减少。土壤中解磷菌的丰富度和多样性随植被类型的转变增加。在门分类水平上,优势类群主要有变形菌门(Proteobacteria)、放线菌门(Actinobacteria)、异常球菌—栖热菌门(Deinococcus-Thermus)等。变形菌门和酸性磷酸酶的含量随植被类型的转变总体呈现出增加趋势,变形菌门与ACP呈极显著正相关。综上所述,随着植被类型转变,稳定态磷逐渐向可利用态磷转化,土壤潜在磷源增加;游离态氧化铁含量的减少有利于有机磷的解吸和矿化,进而增加磷的有效性;解磷菌群落结构与多样性变化会受到土壤理化性质的影响,解磷微生物可通过分泌酸性磷酸酶的方式水解有机化合物并降解固定在土壤的无机磷,进而提高磷的有效性。To investigate the availability of soil phosphorus under different vegetation types in red soil erosion area,in this paper,four planting cover types of bare land(CK),coniferous forest(CF),coniferous and broad-leaved mixed forest(CB)and broadleaved forest(BF)were selected from the National Positioning Observation and Research Station of red soil Hilly Ecosystem in Changting,Fujian Province.The forms of iron oxides and phosphorus(P)were determined,and the P solubilizing bacteria(PSM)were determined by high-throughput sequencing technology.The results showed that with the change of vegetation type,the content of moderately active P increased,the content of low active P decreased,and the content of free iron oxide(Fe d)decreased gradually.The richness and diversity of P solubilizing bacteria increased with the change of vegetation type.At the level of phylum classification,the dominant groups were mainly Proteobacteria,Actinobacteria,Deinococcus-Thermus and so on.The contents of Proteobacteria and acid P increased with the change of vegetation type,and there was a extremely significant positive correlation between Proteobacteria and ACP.In conclusion,with the change of vegetation type,stable P gradually transforms to available P,and soil potential P sources increase.The reduction of free iron oxide content is beneficial to the desorption and mineralization of organophosphorus,which increases the availability of P.The changes in the community structure type and diversity of P solubilizing bacteria are affected by the physical and chemical properties of soil.Phosphorus solubilizing microorganisms can hydrolyze organic compounds and degrade inorganic P fixed in soil by secreting acid P,thus improving the availability of P.

关 键 词：红壤侵蚀区 土壤剖面 磷素组分 铁氧化物 解磷菌 

分 类 号：S714[农业科学—林学]