巨桉林下不同粒径的土壤团聚体速效磷分布研究  

Distribution of Available P under Different Particle Size of Soil Aggregates of the Eucalyptus Grandis Plantation

作　　者：王会敏[1] 梁玉芳[2] 周贵尧[3] 王春燕[4] 蒋代彬 

机构地区：[1]辽宁工程技术大学公共管理与法学院,辽宁阜新123000 [2]辽宁工程技术大学矿业学院,辽宁阜新123000 [3]江苏大学农业工程研究院,江苏镇江212013 [4]西南大学地理科学学院,重庆400715 [5]柳树中学,四川遂宁629209

出　　处：《资源开发与市场》2015年第8期899-903,998,共6页Resource Development & Market

摘　　要：选取3.5年生巨桉林地下纯林、林果和林粮三种不同土地模式的土壤进行研究,同时与弃耕地土壤进行参照对比,采用野外调查和室内实验分析相结合的方法,分析了不同巨桉林地模式下土壤速效磷含量的分布特征。结果表明,在土壤团聚体组成中,0.25—0.5mm团聚体所占比例最小的为纯林,2—5mm团聚体在土壤团聚体组成中所占比例最大的为林果,巨桉林地模式下<0.25mm的微团聚体组成比例较弃耕地所占比例小,相反>0.25mm的大粒径团聚体累积含量更高;不同模式对土壤速效磷含量及分布的影响存在一定差异性,速效磷含量从大到小为弃耕地>林果>林粮>纯林;弃耕地在各粒径土壤团聚体中的速效磷含量与其他三种林地模式相比差异极显著,其他三种林地模式在<0.25mm、1—2mm团聚体平均速效磷含量中的差异不显著;四种模式各粒径土壤团聚体与土壤速效磷含量的相关性为:0.5—1mm、1—2mm、5—7mm粒径土壤团聚体速效磷含量与土壤中速效磷含量呈现极显著相关,0.25—0.5mm、2—5mm粒径土壤团聚体速效磷含量与土壤中速效磷含量呈现显著相关。This paper chose 3. 5 born Eucalyptus grandis plantation,giant Eucalyptus ＋ fruit trees and giant Eucalyptus ＋ grain crop soil as the research object,abandoned farmland soil as the comparison,by adopting the combination of field survey and indoor experiment analysis method,analyzed the distribution characteristics of soil available phosphorus content of different eucalypt forestland mode. The results showed that 0. 25-0. 5mm soil aggregates accounted for the smallest proportion was pure forest and 2-5mm aggregates accounted for the largest proportion was forestry and fruit in soil aggregates component,however,in eucalypt forestland mode,microaggregates of 0. 25 mm component proportion accounts for small proportion,high grain size of 0. 25 mm aggregates in cumulative content greater compared with the abandoned arable land. Different mode of soil available phosphorus content and the distribution had certain differences. The available phosphorus content from large to small was abandoned farmland orchard fruit grain pure forest,abandoned farmland in each particle size aggregates of soil available phosphorus content compared with the other three woodland pattern very significant difference,the other three woodland pattern was not significant in 0. 25 mm,1-2mm aggregates average available phosphorus content was difference. Correlation content of soil available and available phosphorus content was 0. 25 mm aggregates,and 0. 5-1mm,1-2mm,5-7mm grain size correlation between available phosphorus in soil aggregates the content of available phosphorus in soil was significant correlation,0. 25-0. 5mm,2-5mm grain size correlation between available phosphorus in soil aggregates the content of available phosphorus in soil was significantly correlated with the content of. From the four modes of overall distribution of different size of soil aggregates the available phosphorus content of view,science and rationality in the course of cultivation of Eucalyptus grandis should strengthen soil fertilization. From all four patterns

关 键 词：巨桉林地 速效磷 土壤团聚体 分布特征 

分 类 号：S151.93[农业科学—土壤学]