Nitrogenase activity by biological soil crusts in cold sagebrush steppe ecosystems

2017 ◽  
Vol 134 (1-2) ◽  
pp. 57-76 ◽  
Author(s):  
Stacy G. Schwabedissen ◽  
Kathleen A. Lohse ◽  
Sasha C. Reed ◽  
Ken A. Aho ◽  
Timothy S. Magnuson
Keyword(s):  
Nitrogenase Activity ◽  
Biological Soil Crusts ◽  
Sagebrush Steppe ◽  
Soil Crusts ◽  
Steppe Ecosystems

scholarly journals Diazotrophic Community Structure and Function in Two Successional Stages of Biological Soil Crusts from the Colorado Plateau and Chihuahuan Desert

2004 ◽  
Vol 70 (2) ◽  
pp. 973-983 ◽  
Author(s):  
Chris M. Yeager ◽  
Jennifer L. Kornosky ◽  
David C. Housman ◽  
Edmund E. Grote ◽  
Jayne Belnap ◽  
...  
Keyword(s):  
Community Structure ◽  
Chihuahuan Desert ◽  
Nitrogenase Activity ◽  
Colorado Plateau ◽  
Biological Soil Crusts ◽  
Rrna Gene ◽  
Soil Crusts ◽  
Clone Sequencing ◽  
Microcoleus Vaginatus ◽  
Diazotrophic Community

ABSTRACT The objective of this study was to characterize the community structure and activity of N2-fixing microorganisms in mature and poorly developed biological soil crusts from both the Colorado Plateau and Chihuahuan Desert. Nitrogenase activity was approximately 10 and 2.5 times higher in mature crusts than in poorly developed crusts at the Colorado Plateau site and Chihuahuan Desert site, respectively. Analysis of nifH sequences by clone sequencing and the terminal restriction fragment length polymorphism technique indicated that the crust diazotrophic community was 80 to 90% heterocystous cyanobacteria most closely related to Nostoc spp. and that the composition of N2-fixing species did not vary significantly between the poorly developed and mature crusts at either site. In contrast, the abundance of nifH sequences was approximately 7.5 times greater (per microgram of total DNA) in mature crusts than in poorly developed crusts at a given site as measured by quantitative PCR. 16S rRNA gene clone sequencing and microscopic analysis of the cyanobacterial community within both crust types demonstrated a transition from a Microcoleus vaginatus-dominated, poorly developed crust to mature crusts harboring a greater percentage of Nostoc and Scytonema spp. We hypothesize that ecological factors, such as soil instability and water stress, may constrain the growth of N2-fixing microorganisms at our study sites and that the transition to a mature, nitrogen-producing crust initially requires bioengineering of the surface microenvironment by Microcoleus vaginatus.

Nitrogenase activity of biological soil crusts and its response to hydrothermic factors in the Shapotou region of northern China

2011 ◽  
Vol 35 (9) ◽  
pp. 906-913 ◽  
Author(s):  
ZHANG Peng ◽  
◽  
LI Xin-Rong ◽  
JIA Rong-Liang ◽  
HU Yi-Gang ◽  
...  
Keyword(s):  
Nitrogenase Activity ◽  
Northern China ◽  
Biological Soil Crusts ◽  
Soil Crusts

The influence of desiccation on the recovery process of nitrogenase activity in restored biological soil crusts

2017 ◽  
Vol 60 (11) ◽  
pp. 1283-1285
Author(s):  
Jiaoli Zheng ◽  
Shuangshuang Li ◽  
Chengrong Peng ◽  
Dunhai Li
Keyword(s):  
Nitrogenase Activity ◽  
Recovery Process ◽  
Biological Soil Crusts ◽  
Soil Crusts

Species-specific nitrogenase activity in lichen-dominated biological soil crusts from the Colorado Plateau, USA

2018 ◽  
Vol 429 (1-2) ◽  
pp. 113-125 ◽  
Author(s):  
Terry J. Torres-Cruz ◽  
Armin J. Howell ◽  
Robin H. Reibold ◽  
Theresa A. McHugh ◽  
Mackenzie A. Eickhoff ◽  
...  
Keyword(s):  
Nitrogenase Activity ◽  
Colorado Plateau ◽  
Biological Soil Crusts ◽  
Soil Crusts ◽  
Species Specific

Discussion on wind factor influencing the distribution of biological soil crusts on surface of sand dunes

2013 ◽  
Vol 5 (6) ◽  
pp. 739
Author(s):  
Wu YongSheng ◽  
Erdun Hasi ◽  
Yin RuiPing ◽  
Zhang Xin ◽  
Ren Jie ◽  
...  
Keyword(s):  
Sand Dunes ◽  
Biological Soil Crusts ◽  
Soil Crusts
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