Soil respiration profiles and protozoan enumeration agree as microbial growth indicators

被引:22
作者
Christensen, S
Ronn, R
Ekelund, F
Andersen, B
Damgaard, J
FribergJensen, U
Jensen, L
Kiil, H
Larsen, B
Larsen, J
Riis, C
Thingsgaard, K
Thirup, C
TomPetersen, A
Vesterdal, L
机构
[1] Department of Population Biology, Copenhagen University, DK-2100, Copenhagen Ø
关键词
D O I
10.1016/0038-0717(96)00064-8
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Carbon, nitrogen or phosphorus limitation of microbial growth in a forest and a field soil was evaluated from measurements of respiration and protozoan counts after nutrient addition. In both soils simultaneous addition of C (glucose) and N (NH4NO3) resulted in microbial growth as indicated by a gradual increase in respiration rate whereas a single addition of C did not induce microbial growth. Addition of P (KH2PO4 + Na2HPO4) to C-amended soil stimulated activity slightly in forest soil but not in field soil whereas addition of P to soil amended with C and N increased growth markedly in both soils. The stimulation of microbial growth indicated by respiration profiles following C and N addition was supported by enumeration of bacterivorous protozoa. The numbers of soil protozoa increased above the control only when C and N were added simultaneously. These observations lend support to the proposal that respiration patterns may be valuable in an analysis of nutrient limitation of microbial growth in soils. Copyright (C) 1996 Elsevier Science Ltd.
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页码:865 / 868
页数:4
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