Nitrogen fixation by microbial crusts from desiccated Sahelian soils (Niger)

被引：38
作者：
Malam Issa, O
Stal, LJ
Défarge, C
Couté, A
Trichet, J
机构：
[1] Univ Orleans, UMR 6531 CNRS, F-45067 Orleans 2, France
[2] Netherlands Inst Ecol, Ctr Estuarine & Coastal Ecol, NL-4400 AC Yerseke, Netherlands
[3] Museum Natl Hist Nat, Lab Cryptogamie, F-75005 Paris, France
来源：
SOIL BIOLOGY & BIOCHEMISTRY | 2001年 / 33卷 / 10期
关键词：
nitrogen fixations; cyanobacteria; microbiotic crusts; arid and semi-arid environments;
D O I：
10.1016/S0038-0717(01)00046-3
中图分类号：
S15 [土壤学];
学科分类号：
0903 ; 090301 ;
摘要：
Cyanobacterial crusts developing on the sandy and loamy soils of fallow lands in the Sahel (Niger) were investigated for their potential to fix nitrogen. Three sites were selected in this and environment, differing in sediment type and species composition. In the sandy sites heterocystous nitrogen-fixing cyanobacteria were present, whereas the loamy site did not contain such species. All sites showed light-dependent nitrogenase activity, starting within 2 h after re-wetting of the desiccated crust samples. Inhibition of photosystem II caused a decrease of nitrogenase activity in the samples with heterocystous cyanobacteria, but was stimulatory in the non-heterocystous crust. The results suggest that cyanobacterial crusts may be important for the improvement of the soil by enriching it with nitrogen. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：1425 / 1428
页数：4
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