Fabrication of nitrogen-doped hollow carbon nanospheres with variable nitrogen contents using mixed polymer brushes as precursors
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Materials Science"
DOI: 10.1007/s10853-019-03320-2
Abstract: Design and synthesis of heteroatoms-doped porous carbon model materials with controllable nitrogen contents and similar pore structure are of great importance for fundamental understanding of the correlation between their intrinsic properties and applications. Herein, we… read more here.
Keywords: nitrogen; carbon; nitrogen contents; mixed polymer ... See more keywords
Components of C and N cycles in natural and anthropogenic ecosystems of semideserts of the northern Caspian area
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DOI: 10.1134/s2079096117010097
Abstract: Changes in the amounts and dynamics of the deposition of carbon and nitrogen in the soil surface of anthropogenic pasture and forest ecosystems created in places of natural steppe and desert plant associations in the… read more here.
Keywords: nitrogen; nitrogen contents; caspian area; carbon nitrogen ... See more keywords
Do phosphorus and nitrogen contents in young corn leaves represent contents in shoots?
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DOI: 10.1139/cjps-2017-0383
Abstract: Abstract: For corn grown on two light-textured soils, leaf P and N concentrations at the six-leaf stage represented their respective concentrations in shoots. At the seven/eight-leaf stage, the P concentration was higher in leaves than… read more here.
Keywords: leaf stage; corn; nitrogen contents; phosphorus nitrogen ... See more keywords
Responses and Indications of Foliar Nitrogen Contents and δ15N values to Atmospheric Nitrogen Deposition in Beijing, China
Sign Up to like & getrecommendations! Published in 2017 at "Acta Ecologica Sinica"
DOI: 10.5846/stxb201511202348
Abstract: 为探究植物对大气氮沉降的响应和对这部分氮素的来源指示作用，本研究通过对北京地区198个采样点，典型落叶阔叶乔木杨属（Populus）和柳属（Salix）植物叶片进行采样，测定其叶片样品含氮量和δ15 N值。结果表明：北京地区杨属植物叶片含氮量为16.5-38.6 g/kg，平均（24.0±4.0）g/kg；柳属植物叶片含氮量为17.2-36.2 g/kg，平均（25.9±4.1）g/kg。研究区域范围内杨属、柳属植物叶片的含氮量均呈现出西北低、东南高的对角线型分布，与该区域大气氮沉降的空间变异相吻合。由于研究区域范围内气候因子无明显的变异，植物叶片的含氮量变化反应了大气氮沉降对植物元素化学计量特征的影响和植物对大气氮沉降的响应。北京地区杨属植物叶片δ15N值为-3.95‰-8.10‰，平均（1.15±2.48）‰；柳属植物叶片δ15N值为-3.04‰-9.73‰，平均（2.31±2.60）‰。杨属和柳属植物叶片的δ15N值均呈现出西北高、中部高、东南低的空间分布，与叶片含氮量空间分布趋势相反。中部城区较高的δ15N值反应了交通污染对大气含氮化合物增加的影响；西北部较高的δ15N值反应了该区域受人为活动排放源的影响较少，自然的氮循环是其较高δ15N值的主要原因；东南部较低的δ15N值则有可能是由农业活动和交通共同作用的结果。 read more here.
Keywords: 15n 15n; nitrogen contents; responses indications; indications foliar ... See more keywords