不同林龄桉树人工林土壤团聚体有机磷组分分布特征  

Distribution of Soil Aggregates-related Organic Phosphorus Fractions in Eucalypt Plantations at Different Stand Ages

作　　者：吴秦展 刘江华 李梁华 何仕川 黄镇 张喆 WU Qinzhan;LIU Jianghua;LI Lianghua;HE Shichuan;HUANG Zhen;ZHANG Zhe(Guangxi State-owned Daguishan Forest Farm,Hezhou 542899,Guangxi,China;College of Forestry,Guangxi University,Nanning 530004,Guangxi,China)

机构地区：[1]广西国有大桂山林场,广西贺州542899 [2]广西大学林学院,广西南宁530004

出　　处：《桉树科技》2023年第2期59-65,共7页Eucalypt Science & Technology

基　　金：广西国有大桂山林场《桉树人工林地力维持策略研究》(202200100);广西壮族自治区林业局《桂东北桉树中大径材培育关键技术研究与示范》(桂林科研[2022ZC]第15号)。

摘　　要：为探索桉树人工林土壤有机磷组分在团聚体中的分布规律及在桉树生长过程中土壤有机磷组分的变化规律,文章以大桂山林场为研究区域,选择1、2、4年生桉树人工林土壤以及邻近撂荒地土壤(CK)为研究对象,采集0~20 cm土层土壤,通过湿筛法将其分为>2 mm、1~2 mm、0.25~1 mm和<0.25 mm粒径团聚体,并测定不同粒径团聚体中有机磷组分。结果表明:不同林龄桉树人工林土壤活性有机磷(LOP)与中稳性有机磷(MSOP)含量在>2 mm粒径团聚体中较高且差异显著,高稳性有机磷(HSOP)含量在<0.25mm粒径团聚体中较高且差异显著,中活性有机磷(MLOP)含量在各粒径团聚体中均不显著。桉树人工林土壤有机磷组分含量均高于CK,土壤LOP和MLOP含量以1年林最高,MSOP与HSOP含量分别以2、4年林最高。CK和不同林龄桉树人工林土壤团聚体的组成以>2 mm粒径团聚体为主,从而使土壤有机磷储量在>2 mm粒径团聚体中最高。在桉树人工林培育过程中,应重视土壤>2 mm粒径团聚体的保护,以维持土壤团聚体的稳定和土壤有机磷的储存。In this study,the Daguishan Forest Farm was selected as the research area for investigating soils of 1-,2-and 4-year-old eucalypt plantations and those of adjacent abandoned land(CK).The surface undisturbed soil samples(0~20 cm)were collected and divided into>2 mm,1~2 mm,0.25~1 mm and<0.25 mm aggregates by the wet sieving method,and the organic phosphorus fractions in these aggregates of different size classes were determined.The results showed that the contents of soil labile organic phosphorus(LOP)and medium stable organic phosphorus(MSOP)were higher in the>2 mm aggregates,the content of high stable organic phosphorus(HSOP)was higher in the<0.25 mm aggregates,and the content of medium labile organic phosphorus(MLOP)did not differ significantly among the aggregate size clas-ses.The contents of organic phosphorus fractions in eucalypt plantation soils were higher than those of CK.The highest contents of LOP and MLOP were observed in the age 1-year plantation,the highest content of MSOP was observed in the age 2-year plantation,and the highest content of HSOP was observed in the age 4-year plantation.In the study area,soil aggregates in the CK and eucalypt plantations of different ages were mainly composed of>2 mm aggregates,so that soil organic phosphorus storage was highest in the>2 mm aggregates.Therefore,in order to maintain the stability of soil ag-gregates and the storage of soil organic phosphorus,the protection of soil aggregates with>2 mm size should be empha-sized during the cultivation of eucalypt plantations.

关 键 词：桉树人工林 土壤团聚体 有机磷组分 

分 类 号：S714.8[农业科学—林学]