【水稻吸收土壤吸附的氨基酸】Cao Xiaochuang Chen Xianyou Li Xiaoyan Yuan Ling Wu Lianghuan Zhu Yuanhong. Rice uptake of soil adsorbed amino acids under sterilized environment.Soil Biology and BiochemistryVolume 62 July 2013 Pages 13–21

Abstract

Plants can directly absorb intact amino acid molecules. However it has not been widely accepted that amino acids can be readily adsorbed to the soil solid phase and that the adsorbed amino acids quantity is more than that of free amino acids. This experiment examined the effects of soil adsorbed glycine on plant glycine uptake uptake efficiency and nutritional contribution as an N source for rice seedling growth under sterilized environment. The silt loam soil from Xiaoshan site had higher glycine sorption capacity than clay loam soil from Xianju site. Soil sorption capacity was closely related to soil physical and chemical properties. Our results revealed that soil adsorbed glycine improved plant biomass compared with ammonium. The content of adsorbed glycine had a positive effect on plant glycine uptake and glycine uptake efficiency in the treatments with different ratios of adsorbed glycine and ammonium. About 4.8–11.6% and 10.9–32.2% of the adsorbed glycine in soil from Xiaoshan and Xianju respectively were found in rice seedling leaves and roots after 21 days of incubation. Glycine uptake accounted for about 15.7–47.3% of plant total N uptake in the treatments with different ratios of adsorbed glycine and ammonium. Glycine nutritional contribution was independent of soil sorption capacity. Therefore we speculated that soil adsorbed amino acids can serve as an important potential N source for plant growth and should not be overlooked in the study of nitrogen cycling in different ecosystems.

【浅层灰壤中深度和温度对温室气体通量的交互作用】R.T.E. Mills N. Dewhirst A. SowerbyB.A. Emmett D.L. Jones.