赣南不同草地类型区土壤粒径分布及分形特征  

Soil Particle Distribution and Fractal Characteristics of Different Grassland Types in Southern Jiangxi

作　　者：兰龙焱 马丽丽 郭晓敏[1] 杨明[1] 叶选 罗英 陈亚东 王洪江 吴平发 牛德奎[1] LAN Longyan;MA Lili;GUO Xiaomin;YANG Ming;YE Xuan;LUO Ying;CHEN Yadong;WANG Hongjiang;WU Pingfa;NIU Dekui(Key Laboratory of Forest Cultivation,College of Forestry,Jiangxi Agricultural University,Nanchang 330045,China;Pingxiang Forestry Research Institute,Pingxiang,Jiangxi 337000,China;Haikou Marine Geological Survey Center,China Geological Survey,Haikou 570100,China;Wetland Protection Management Office,Jiangxi Provincial Forestry Burea,Nanchang 330001,China)

机构地区：[1]江西农业大学林学院/森林培育重点实验室,江西南昌330045 [2]萍乡市林业科学研究所,江西萍乡337000 [3]中国地质调查局海口海洋地质调查中心,海南海口570100 [4]江西省林业局湿地保护管理办公室,江西南昌330001

出　　处：《江西农业大学学报》2022年第1期222-232,共11页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家自然科学基金项目(31760233)。

摘　　要：【目的】研究赣南不同草地类型区土壤颗粒组成与分形特征,为该地区草地植物保护与利用提供参考依据。【方法】研究按不同区域进行样地设置,采用典型抽样法对不同区域不同草地类型植被群落特征进行调查,测定土壤粒径特征及全量养分指标,用土壤颗粒体积分形维数模型计算分形维数D值。【结果】(1)赣南地区不同类型草地土壤颗粒主要以粉粒(30.05%)、细砂粒(23.27%)、中砂粒(17.35%)为主;土壤颗粒的分形维数D值在2.9010~2.9786,处于中上水平;(2)土壤颗粒分形维数D值与粉粒呈显著性正相关关系,与粗砂粒、极粗砂粒呈显著性负相关关系;(3)随着土层加深,粒径<50μm的土壤颗粒含量增加,粒径>500μm的颗粒含量减少;土壤分形维数D值随土层加深而增加,只是增加的幅度不明显;(4)土壤有机质、全氮含量与土壤颗粒组成中中砂粒和粗砂粒均呈极显著正相关关系,与土壤分形维数、黏粒、粉粒体积百分含量呈极显著负相关关系(P<0.01)。【结论】赣南地区土壤颗粒以粉粒为主,土壤分形维数值较高,土壤结构均匀,有利于草地植物的正常生长,但是也在一定程度上导致了草地植物的灌丛化,因此在对赣南地区草地植物保护的同时应更加注重土壤粒径分布及分形特征。[Objective]Through researching the soil particle composition and fractal characteristics of different grassland type areas in Gannan,this study aims to provide a reference for the conservation and utilization of grassland plants in the region.[Method]In this study,sample plots were set up in different areas,and the typical sampling method was used to investigate the vegetation community characteristics of different grassland types in different areas,determine the soil particle characteristics and total nutrient indexes.In addition,the fractal dimension model of soil particle volume was used to calculate the fractal dimension D value.[Result](1)Soil particles of different types of grasslands in Gannan were mainly powder(30.05%),fine sand(23.27%)and medium sand(17.35%);the fractal dimension D values of soil particles were in the range of 2.9010-2.9786,which was in the middle to upper level;(2)Fractal dimension D values of soil particle were significantly and positively correlated with powder particles and negatively correlated with coarse and very coarse sand particles;(3)As the soil layer deepens,the content of soil particles with particle size<50μm increased and the content of particles with particle size>500μm decreased;the value of soil fractal dimension D increased slightly with the deepening of the soil layer;(4)Soil organic matter and total nitrogen content showed highly-significant positive correlations with both medium and coarse sand particles in soil particle composition,and highly-significant negative correlations(P<0.01)with soil fractal dimension,clay particles,and percentage contents of powder particles.[Conclusion]Soil particles in Gannan region are mainly powder particles with high soil fractal dimension values and uniform soil structure,which are conducive to the growth of grass plants;however,they also lead to the scrubbing of grass plants to a certain extent.More attention should be paid to soil particle distribution and fractal characteristics while protecting grass plants in Gannan.

关 键 词：草地类型 土壤粒径分布 分形维数 土壤养分 

分 类 号：S283[农业科学—农业水土工程]