Comparative study of nitrogenase activity in different types of biological soil crusts in the Gurbantunggut Desert, Northwestern China

CORC > 新疆生态与地理研究所 > 中国科学院新疆生态与地理研究所 > 中国科学院新疆生态与地理研究所(2010年以前数据)

	Comparative study of nitrogenase activity in different types of biological soil crusts in the Gurbantunggut Desert, Northwestern China
	Wu ; N. ; Zhang ; Y. M. ; Downing ; A.
刊名	JOURNAL OF ARID ENVIRONMENTS
	2009
卷号	73 期号:9 页码:828-833
关键词	BLUE-GREEN-ALGAE ACETYLENE-REDUCTION CHIHUAHUAN DESERT CONVERSION FACTOR COLORADO PLATEAU LICHEN CRUSTS NEGEV DESERT WIND EROSION FIXATION MICROSTRUCTURE
ISSN号	0140-1963
通讯作者	Zhang, YM, Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Key Lab Oasis Ecol & Desert Environm, 818 S Beijing Rd, Urumqi 830011, Xinjiang, Peoples R China
中文摘要	Biological soil crusts cover large areas of the Gurbantunggut Desert in northwestern China where they make a significant contribution to soil stability and fertility. The aim of this study was to quantify the potential nitrogen-fixing activity (NA) of different types of biological soil crusts in the Gurbantunggut Desert. The results suggest that NA (nmol C2H4 m(-2) h(-1)) for each type of crusts was highly variable. Seasonal variation was also important, with all three types of crusts responding in a similar way to changes in environmental conditions. From March to May, NA was relatively low for all crust types. During this season, NA was 2.26 x 10(3) for cyanobacterial crust followed by lichen crust (6.54 x 10(2)) and moss crust (6.38 x 10(2)). From June to October, all crust types reached their highest level of NA, especially lichen crust and moss crust (p < 0.01). The NA of cyanobacterial crust (9.81 x 10(3)) was higher than that of lichen crust (9.06 x 10(3)) and moss crust (2.03 x 10(3)). From November to February, when temperatures were consistently low (<0 degrees C), NA was at its lowest level, especially in cyanobacterial crust (4.18 x 10(2)) and moss crust (5.43 x 10(2)) (P < 0.01). Our results indicate that species composition is critical when estimating N inputs in desert ecosystems. fit addition, all three types of crusts generally responded in a similar way to environmental conditions. The presence of N fixation activity in all crusts may contribute to the maintenance of fertility in sparsely vegetated areas and provide surrounding vascular plant with fixed nitrogen. (C) 2009 Elsevier Ltd. All rights reserved.
学科主题	生物化学与分子生物学
收录类别	SCI
公开日期	2011-08-19
内容类型	期刊论文
源URL	[http://ir.xjlas.org/handle/365004/10096]
专题	新疆生态与地理研究所_中国科学院新疆生态与地理研究所(2010年以前数据)
推荐引用方式 GB/T 7714	Wu,N.,Zhang,et al. Comparative study of nitrogenase activity in different types of biological soil crusts in the Gurbantunggut Desert, Northwestern China[J]. JOURNAL OF ARID ENVIRONMENTS,2009,73(9):828-833.
APA	Wu,N.,Zhang,Y. M.,Downing,&A..(2009).Comparative study of nitrogenase activity in different types of biological soil crusts in the Gurbantunggut Desert, Northwestern China.JOURNAL OF ARID ENVIRONMENTS,73(9),828-833.
MLA	Wu,et al."Comparative study of nitrogenase activity in different types of biological soil crusts in the Gurbantunggut Desert, Northwestern China".JOURNAL OF ARID ENVIRONMENTS 73.9(2009):828-833.