森林演替过程中优势树种凋落叶对土壤微生物组成的影响

被引：6

作者：

梁健

王孝安

陶树兴

何文莹

王慧敏

机构：

[1] 陕西师范大学生命科学学院

来源：

生态学杂志 | 2008年 / 07期

关键词：

马栏林区; 凋落叶; 土壤微生物; 植被演替;

D O I：

10.13292/j.1000-4890.2008.0240

中图分类号：

S714 [森林土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

为了进一步认识森林群落演替机理,研究了黄土高原马栏林区处于不同演替阶段的森林土壤微生物组成,以及优势树种凋落叶对土壤微生物组成的影响。采用凋落叶浸提液处理不同类型的土壤,利用土壤浸提液固体培养基测定微生物数量,以系统聚类和主成分分析等方法进行数据分析。结果表明:微生物总数量及土壤细菌数量按白桦(Betulaplatyphylla)林→油松(Pinus tabulaeformis)林→辽东栎(Quercus liaotungensis)林递增;在先锋森林群落向顶极群落演替过程中,微生物组成的综合性指标Shannon-Wiener指数呈下降趋势;土壤微生物3大类群中,数量较少者对Shannon-Wiener指数的大小变化起着较大作用;依据可培养微生物组成,8种土样可划分为3个类群,辽东栎及油松凋落叶对土壤微生物组成的影响不同,辽东栎凋落叶对土壤微生物学性质的作用更强;马栏林区森林土壤微生物组成与植被类型及演替阶段关系密切;演替高级阶段森林优势树种凋落叶可能通过其对土壤微生物组成的改造优势,逐渐改变土壤的微生物学性质,进而促进植被演替。

引用

页码：1127 / 1133

页数：7

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