杉木、马尾松及其混交林根际土壤磷素特征  

Phosphorus characteristics in rhizosphere soil of Cunninghamia lanceolata,Pinus massoniana and their mixed plantations.

作　　者：张鼎华[1,2] 林开淼[1,2] 李宝福[3] 

机构地区：[1]科技部湿润亚热带山地生态国家重点实验室培育基地,福州350007 [2]福建师范大学生命科学学院,福州350007 [3]福建省林业科学研究院,福州350012

出　　处：《应用生态学报》2011年第11期2815-2821,共7页Chinese Journal of Applied Ecology

基　　金：福建省人才创新基金项目(2001J037)资助

摘　　要：2007—2010年,在福建省南平市延平区太平试验林场比较分析了杉木、马尾松纯林及其混交林根际土壤的磷素特征.结果表明:在杉木、马尾松纯林中,根际土壤的有效磷含量均大于非根际土壤.与非根际土壤相比,杉木、马尾松纯林及其混交林的根际土壤pH值均出现下降趋势;根际土O-P的数量低于非根际土,而Al-P和Fe-P则高于非根际土;3种林型中,根际土壤对磷的吸附量小于非根际土壤;而根际土壤磷解吸量和解吸率均高于非根际土壤.杉木、马尾松纯林中,马尾松根际土壤的有效磷、Fe-P、Al-P、解吸量和解吸率均高于杉木,而O-P、磷吸附量则低于杉木.杉木与马尾松混交后,二者根际土壤磷的活化作用进一步加强,且杉木的增幅更大.杉木与马尾松混交有利于杉木根系磷素营养的改善.In 2007-2010,a comparative study was conducted on the phosphorus characteristics in the rhizosphere soil of Cunninghamia lanceolata,Pinus massoniana and C.lanceolata-P.massoniana mixed plantations in a forest farm in Nanping City of Fujian Province,East China.In the rhizosphere soil of pure C.lanceolata and P.massoniana plantations,the content of available P was higher than that in non-rhizosphere soil.As compared with non-rhizosphere soil,the rhizophere soil in the three plantations had lower pH and O-P content but higher Al-P and Fe-P contents,and its P adsorption capacity was lower while the P desorption rate and desorbed P were in adverse.In the rhizophere soil of pure P.massoniana plantation,the contents of available P,Fe-P,and Al-P,their desorption rates,and desorption capacity were higher,but the O-P content and the adsorbed P were lower,as compared with those in the rhizophere soil of pure C.lanceolata plantation.In the mixed plantation,the P activation in rhizophere soil was further improved,being more obvious under C.lanceolata,which suggested that mixed plantation of C.lanceolata and P.massoniana could promote the phosphorus nutrition of C.lanceolata.

关 键 词：杉木 马尾松 混交林 根际土壤 磷 

分 类 号：S714[农业科学—林学]