Nutrient limitations to soil microbial biomass and activity in loblolly pine forests

被引：162

作者：

Allen, AS

Schlesinger, WH

机构：

[1] Duke Univ, Nicholas Sch Environm & Earth Sci, Durham, NC 27708 USA

[2] Duke Univ, Dept Biol, Durham, NC 27708 USA

来源：

SOIL BIOLOGY & BIOCHEMISTRY | 2004年 / 36卷 / 04期

基金：

美国国家航空航天局;

关键词：

soil microorganisms; nutrient limitation; respiration; nitrogen; phosphorus; carbon;

D O I：

10.1016/j.soilbio.2003.12.002

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

We performed an assay of nutrient limitations to soil microbial biomass in forest floor material and intact cores of mineral soil collected from three North Carolina loblolly pine (Pinus taeda) forests. We added solutions containing C, N or P alone and in all possible combinations, and we measured the effects of these treatments on microbial biomass and on microbial respiration, which served as a proxy for microbial activity, during a 7-day laboratory incubation at 22 degreesC. The C solution used was intended to simulate the initial products of fine root decay. Additions of C dramatically increased respiration in both mineral soil and forest floor material, and C addition increased microbial biomass C in the mineral soil. Additions of N increased respiration in forest floor material and increased microbial biomass N in the mineral soil. Addition of P caused a small increase in forest floor respiration, but had no effect on microbial biomass. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：581 / 589

页数：9

共 38 条

[1] Nitrogen saturation in temperate forest ecosystems - Hypotheses revisited [J].