干旱区生态环境知识资源中心(Arid): Short-Term Effect of Nitrogen Intensification on Aggregate Size Distribution, Microbial Biomass and Enzyme Activities in a Semi-Arid Soil Under Different Crop Types

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DOI	10.1016/S1002-0160(19)60802-7
	Short-Term Effect of Nitrogen Intensification on Aggregate Size Distribution, Microbial Biomass and Enzyme Activities in a Semi-Arid Soil Under Different Crop Types
	Murugan, Rajasekaran 1; Parama, V. R. Ramakrishna 2; Madan, Beate 3; Muthuraju, R.4; Ludwig, Bernard 1
通讯作者	Murugan, Rajasekaran
来源期刊	PEDOSPHERE
ISSN	1002-0160
EISSN	2210-5107
出版年	2019
卷号	29 期号:4 页码:483-491
英文摘要	There is a lack of quantitative assessments available on the effect of agricultural intensification on soil aggregate distribution and microbial properties. Here, we investigated how short-term nitrogen (N) intensification induced changes in aggregate size distribution and microbial properties in a soil of a hot moist semi-arid region (Bangalore, India). We hypothesised that N intensification would increase the accumulation of macroaggregates > 2 mm and soil microbial biomass and activity, and that the specific crop plant sowed would influence the level of this increase. In November 2016, surface (0-10 cm) and subsurface (10-20 cm) soil samples were taken from three N fertilisation treatments, low N (50 kg N ha(-1)), medium N (75 and 100 kg N ha(-1) for finger millet and maize, respectively), and high N (100 and 150 kg N ha(-1) for finger millet and maize, respectively). Distribution of water-stable aggregate concentrations, carbon (C) and N dynamics within aggregate size class, and soil microbial biomass and activity were evaluated. The high-N treatment significantly increased the concentration of large macroaggregates in the subsurface soil of the maize crop treatment, presumably due to an increased C input from root growth. Different N fertilisation levels did not significantly affect C and N concentrations in different aggregate size classes or the bulk soil. High-N applications significantly increased dehydrogenase activity in both the surface soil and the subsurface soil and urease activity in the surface soil, likely because of increased accumulation of enzymes stabilised by soil colloids in dry soils. Dehydrogenase activity was significantly affected by the type of crop, but urease activity not. Overall, our results showed that high N application rates alter large macroaggregates and enzyme activities in surface and subsurface soils through an increased aboveground and corresponding belowground biomass input in the maize crop.
英文关键词	agricultural intensification biomass input C and N dynamics large macroaggregate microaggregate N application small macroaggregate water-stable aggregates
类型	Article
语种	英语
国家	Germany ; India
收录类别	SCI-E
WOS记录号	WOS:000476474500007
WOS关键词	ORGANIC-MATTER ; COMMUNITIES ; CARBON ; MAIZE ; SEQUESTRATION ; FERTILIZERS ; MANAGEMENT ; SEQUENCE ; BIOTA ; ASSAY
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217888
作者单位	1.Univ Kassel, Dept Environm Chem, Nordbahnhof Str 1a, D-37213 Witzenhausen, Germany; 2.Univ Agr Sci GKVK, Dept Soil Sci & Agr Chem, Bangalore 560065, Karnataka, India; 3.Univ Kassel, Organ Plant Prod & Agroecosyst Res Trop & Subtrop, Stein Str 19, D-37213 Witzenhausen, Germany; 4.Univ Agr Sci GKVK, Dept Agr Microbiol, Bangalore 560065, Karnataka, India
推荐引用方式 GB/T 7714	Murugan, Rajasekaran,Parama, V. R. Ramakrishna,Madan, Beate,et al. Short-Term Effect of Nitrogen Intensification on Aggregate Size Distribution, Microbial Biomass and Enzyme Activities in a Semi-Arid Soil Under Different Crop Types[J],2019,29(4):483-491.
APA	Murugan, Rajasekaran,Parama, V. R. Ramakrishna,Madan, Beate,Muthuraju, R.,&Ludwig, Bernard.(2019).Short-Term Effect of Nitrogen Intensification on Aggregate Size Distribution, Microbial Biomass and Enzyme Activities in a Semi-Arid Soil Under Different Crop Types.PEDOSPHERE,29(4),483-491.
MLA	Murugan, Rajasekaran,et al."Short-Term Effect of Nitrogen Intensification on Aggregate Size Distribution, Microbial Biomass and Enzyme Activities in a Semi-Arid Soil Under Different Crop Types".PEDOSPHERE 29.4(2019):483-491.