干旱区生态环境知识资源中心(Arid): Field and laboratory study of nitrogen mineralization dynamics in four Tunisian soils

Arid

DOI	10.1016/j.jafrearsci.2019.03.021
	Field and laboratory study of nitrogen mineralization dynamics in four Tunisian soils
	Dridi, Imene; Gueddari, Moncef
通讯作者	Dridi, Imene
来源期刊	JOURNAL OF AFRICAN EARTH SCIENCES
ISSN	1464-343X
EISSN	1879-1956
出版年	2019
卷号	154 页码:101-110
英文摘要	Prediction of nitrogen mineralization from soil organic matter is important when we try to optimize nitrogen fertilization and assess adverse nitrogen impacts on the environment. Thus, four non-fertilized soils were selected in Northern Tunisia to investigate, throughout a field and laboratory approach, the influence of soil properties on nitrogen mineralization and to classify them according to their potentially mineralizable nitrogen and kinetics. Our field results showed an enrichment in inorganic nitrogen contents mainly in surface horizons. These contents decreased with depth following different patterns depending on the soil type. The highest content of inorganic nitrogen was recorded in the Calcisol (232.09 mg kg(-1)) due to high organic carbon and nitrogen amounts and low C:N ratio throughout the profile. The lowest content was recorded in the Luvisol (< 30 mg kg(-1)) because of its large clay-silt fraction and low pH level (4.8 +/- 0.1) especially in depth. The vertical distribution of ammonium and nitrate contents showed marked monthly variations. During January and February, the decrease in inorganic nitrogen contents was attributed to lower soil temperature and higher moisture causing the nitrate to be more leached. In March, inorganic nitrogen contents reached their maximum in surface horizons. These contents started to decrease in April and regressed in May and June except for the Vertisol, which still recorded high-inorganic nitrogen content. The laboratory results presented the following decreasing order of potentially mineralizable nitrogen and kinetics: Calcisol > Vertisol > Cambisol > Luvisol, and revealed two fractions constituting organic nitrogen supplies. An active fraction with a rapid mineralization and a passive fraction slowed down by clays and resistant to biodegradation.
英文关键词	Semi-arid regions Potentially mineralizable nitrogen Nitrogen fertilization Environment impacts
类型	Article
语种	英语
国家	Tunisia
收录类别	SCI-E
WOS记录号	WOS:000466248200009
WOS关键词	MICROBIAL BIOMASS ; TEMPERATURE ; MOISTURE ; AVAILABILITY ; GRASSLAND ; INDEXES ; CARBON
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216616
作者单位	Univ Tunis El Manar, Fac Sci Tunis, Dept Geol, Tunis 2092, Tunisia
推荐引用方式 GB/T 7714	Dridi, Imene,Gueddari, Moncef. Field and laboratory study of nitrogen mineralization dynamics in four Tunisian soils[J],2019,154:101-110.
APA	Dridi, Imene,&Gueddari, Moncef.(2019).Field and laboratory study of nitrogen mineralization dynamics in four Tunisian soils.JOURNAL OF AFRICAN EARTH SCIENCES,154,101-110.
MLA	Dridi, Imene,et al."Field and laboratory study of nitrogen mineralization dynamics in four Tunisian soils".JOURNAL OF AFRICAN EARTH SCIENCES 154(2019):101-110.