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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	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; Ramakrishna Parama V R; Madan Beate; Muthuraju R; Ludwig Bernard
来源期刊	Pedosphere
ISSN	1002-0160
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
收录类别	CSCD
WOS研究方向	Agriculture
CSCD记录号	CSCD:6545988
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336155
作者单位	Murugan Rajasekaran, Department of Environmental Chemistry,University of Kassel, Witzenhausen, 37213, Germany.; Ludwig Bernard, Department of Environmental Chemistry,University of Kassel, Witzenhausen, 37213, Germany.; Ramakrishna Parama V R, Department of Soil Science and Agricultural Chemistry,University of Agricultural Sciences (GKVK), Bangalore, Karnataka 560065, India.; Madan Beate, Organic Plant Production and Agroecosystems Research in the Tropics and Subtropics,University of Kassel, Witzen-hausen, 37213, Germany.; Muthuraju R, Department of Agricultural Microbiology,University of Agricultural Sciences (GKVK), Bangalore, Karnataka 560065, India.
推荐引用方式 GB/T 7714	Murugan Rajasekaran,Ramakrishna Parama V R,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,Ramakrishna Parama V R,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.