文献类型: 外文期刊
第一作者: Cao, Xiao-chuang
作者: Cao, Xiao-chuang;Zhu, Lian-feng;Jin, Qian-yu;Ma, Qing-xu;Wu, Liang-huan
作者机构:
关键词: Soil adsorbed glycine;Ammonium;Glycine uptake;Glycine bioavailability;Sterile cultivation
期刊名称:JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE B ( 影响因子:3.066; 五年影响因子:3.057 )
ISSN: 1673-1581
年卷期: 2016 年 17 卷 4 期
页码:
收录情况: SCI
摘要: In recent years, excessive use of chemical nitrogen (N) fertilizers has resulted in the accumulation of excess ammonium (NH4 (+)) in many agricultural soils. Though rice is known as an NH4 (+)-tolerant species and can directly absorb soil intact amino acids, we still know considerably less about the role of high exogenous NH4 (+) content on rice uptake of soil amino acids. This experiment examined the effects of the exogenous NH4 (+) concentration on rice uptake of soil adsorbed glycine in two different soils under sterile culture. Our data showed that the sorption capacity of glycine was closely related to soils;' physical and chemical properties, such as organic matter and cation exchange capacity. Rice biomass was significantly inhibited by the exogenous NH4 + content at different glycine adsorption concentrations. A three-way analysis of variance demonstrated that rice glycine uptake and glycine nutritional contribution were not related to its sorption capacity, but significantly related to its glycine:NH4 (+) concentration ratio. After 21-d sterile cultivation, the rice uptake of adsorbed glycine accounted for 8.8%;-22.6% of rice total N uptake, which indicates that soil adsorbed amino acids theoretically can serve as an important N source for plant growth in spite of a high NH4 (+) application rate. However, further studies are needed to investigate the extent to which this bioavailability is realized in the field using the C-13, N-15 double labeling technology.
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