岷江上游不同植被下土壤团聚体特征分析

应用生态学报 ›› 2005, Vol. 16 ›› Issue (8): 1405-1410.

岷江上游不同植被下土壤团聚体特征分析

宁丽丹¹, 石辉², 周海军¹, 刘世荣³

1. 西南师范大学资源环境科学院, 重庆 400715;
2. 西安建筑科技大学环境与市政工程学院西北水资源与环境生态教育部重点实验室, 西安 710055;
3. 中国林业科学研究院森林生态环境与保护科学研究所, 北京 100091

收稿日期:2004-09-10 修回日期:2005-01-14 出版日期:2005-08-15 发布日期:2005-08-15
通讯作者: 石辉,E-mail:hshi@sohu.com
基金资助:
国家重点基础研究发展规划项目(2002CB11504)、国家杰出青年基金项目(30125036)和国家自然科学基金资助项目(40471078).

Quantitative characteristics of soil aggregates under different vegetations in upper reach of Minjiang River

NING Lidan¹, SHI Hui², ZHOU Haijun¹, LIU Shirong ³

1. College of Resource and Environment, Southwest Normal China University, Chongqing 400715, China;)2.College of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
3. Institute of Forest Ecology Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China

Received:2004-09-10 Revised:2005-01-14 Online:2005-08-15 Published:2005-08-15

摘要/Abstract

摘要： 以岷江上游卧龙自然保护区内不同植被条件下土壤为对象,研究了暗针叶林、针阔混交林、暗针叶林林窗下箭竹林、高山栎4种植被土壤的团聚体数量特征.结果表明,湿筛法得到的4种植被类型土壤团聚体服从对数正态分布,其几何平均直径与标准差之间存在负相关关系.其中,针阔混交林和高山栎林土壤具有较大的团聚体直径.土壤的分维数范围在2.40～2.78之间,＜0.25mm团聚体含量越高,土壤团聚体分形维数越大,暗针叶林土壤的第2层和暗针叶林窗箭竹林土壤的第3层的分形维数最大.土壤团聚体的保存机率以3～1mm、1～0.5mm粒径级团聚体为大,遭到破坏的可能性小;＞10mm、0.5～0.25mm粒径级的团聚体的保存机率小,容易遭到破坏.对团聚体稳定性指数进行剖面加权平均发现,针阔混交林土壤的稳定性指数最高,其次为高山栎林土壤、暗针叶林林窗下箭竹林和暗针叶林土壤,说明针阔混交林和高山栎林有利于土壤团聚体的稳定.团聚体的3个数量特征之间具有密切联系,均可用于说明土壤团聚体稳定性的大小.

关键词: 植被, 土壤团聚体, 对数正态分布, 分形维数, 团聚体稳定性指数

Abstract: Quantitative analysis on the soil aggregates under dark coniferous forest,coniferous and broad-leaved mixed forest,fargesia under the gap of dark coniferous forest,and sclerophyllous oaks (Quercus semicarpifolia) at Wolong Natural Reserve in the upper reach of Minjiang River showed that wet-sieving soil aggregates were of logarithmic-normal distribution,and the geometric mean diameters were negatively correlated to geometric standard deviation.The aggregates under coniferous and broad-leaved mixed forest and sclerophyllous oaks had larger sizes than those under other vegetations.The range of fractal dimension of soil aggregates was 2.402.78,along with more aggregates less than 0.25 mm in size.The fractal dimension of soil aggregates under dark coniferous forest and fargesia were larger than that under other vegetations.The soil aggregates with 31 mm and 10.5 mm in size had a higher stability,while those with >10 mm and 0.50.25 mm in size were in adverse.The aggregate stability index of soil under coniferous and broad-leaved mixed forest was the highest,followed by that under sclerophyllous oaks,fargesia under the gap of dark coniferous forest,and dark coniferous forest,which meant that coniferous and broadleaf mixed forest and sclerophyllous oaks were favorable for soil aggregate stability.Significant correlations were found among the three quantitative characteristics,which could be used to indicate the stability of soil aggregates.

Key words: Vegetation, Soil aggregate, Logarithmic normal distribution, Fractal dimension, Soil aggregate stability index

中图分类号:

宁丽丹, 石辉, 周海军, 刘世荣. 岷江上游不同植被下土壤团聚体特征分析[J]. 应用生态学报, 2005, 16(8): 1405-1410.

NING Lidan, SHI Hui, ZHOU Haijun, LIU Shirong . Quantitative characteristics of soil aggregates under different vegetations in upper reach of Minjiang River[J]. Chinese Journal of Applied Ecology, 2005, 16(8): 1405-1410.

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