闽东山区不同密度突脉青冈人工林土壤肥力的分形研究  

Fractal Study on Soil Fertility of Different Densities of Cyclpbalanopsis elevaticostata Plantation in East Fujian Mountainous Area

作　　者：林武星[1] 郑郁善[2] 陈礼光[2] 朱炜[1] 

机构地区：[1]福建省林业科学研究院,福州350012 [2]福建农林大学林学院,福州350003

出　　处：《中国农学通报》2015年第31期7-11,共5页Chinese Agricultural Science Bulletin

基　　金：福建省科技厅项目"台湾优良海防阔叶树种引进及应用"(2008I0006);国家林业局南方山地用材林培育重点实验室;福建省森林培育与林产品加工利用重点实验室资助

摘　　要：针对闽东山区造林树种针叶化且连栽引起生产力下降和地力退化问题,开展乡土阔叶树种突脉青冈密度选择试验。运用分形理论对造林密度分别为2400、3000、3600和4050株/hm2的突脉青冈人工林的土壤结构和理化性质进行研究,以荒山为对照。结果显示:突脉青冈土壤分形维数与土壤水稳性团聚体、团聚体含量、结构体破坏率及土壤理化性质呈显著回归关系,分形维数与>0.25 mm土壤颗粒含量线性负相关,与结构体破坏率呈线性正相关;不同密度的突脉青冈土壤团粒结构的分形维数大小顺序表现为荒山>4050株/hm2>3600株/hm2>2400株/hm2>3000株/hm2。上述表明:分形维数可用于表征土壤肥力大小,突脉青冈造林密度为3000株/hm2时的土壤结构、稳定性及肥力最好,是最佳造林密度;运用分形理论研究林地肥力状况为林地质量评价提供了一种新思路。The selecting-density experiment of Cyclpbalanopsis elevaticostata plantation was carried out to solve the production decrease and soil degradation due to conifer problem and continuous planting in east Fujian mountainous area. The fractal theory was used to study the soil structure and physicochemical properties of different densities including 2400, 3000, 3600 and 4500 tree/hm2 of Cyclpbalanopsis elevaticostata plantation and barren mountainous area. The results showed that the soil fractal dimension had significant regression relationships with soil water stable aggregate, soil aggregate contents, ratio of structure damage and physicochemical properties, The soil fractal dimension showed a positive linear correlation with the content of soil particle 〉0.25 mm and a negative correlation with the ratio of structure damage. The fractal dimension of soil aggregate structure in different densities showed an order as： barren mountainous area〉 4050 tree/hm2〉3600 tree/hm2〉2400 tree/hm2〉3000 tree/hm2. The above results indicated that the fractal dimension was able to characterizing soil fertility. The density of 3000 tree/hm2 of Cyclpbalanopsis elevaticostata plantation was the best in structural stability and fertility status. Application of the fractal theory to the research of forest soil fertility provided a new idea for forest assessment.

关 键 词：突脉青冈 密度 分形维数 土壤结构 土壤肥力 

分 类 号：S152.4[农业科学—土壤学] S725.2[农业科学—农业基础科学]