Effect of Rare Earths on Fractionation and Transformation of Soil Available Nitrogen  

作　　者：丁士明 梁涛 张自立 孙琴 张朝生 

机构地区：[1]Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science [2]Department of Soil & Agrichemistry, Anhui Agricultural University [3]State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment [4]Department of Geography and Environmental Change Institute, National University of Ireland

出　　处：《Journal of Rare Earths》2003年第5期582-586,共5页稀土学报（英文版）

基　　金：ProjectedsupportedbytheNationalNaturalScienceFoundationofChina ( 2 9890 2 80 ;40 2 3 2 0 2 2 )

摘　　要：The effect of rare earths (RE) on fractionation and transformation of available nitrogen in a yellow cinnamon soil was studied with soil cultivation. The results show that under the dry condition, when the extraneous RE are added to the soil, both concentrations of soil ammonium N and hydrolysable N increase, and the concentrations of soil nitric N decrease. The concentrations of soil available N increase with the increase of RE concentrations in soils when the RE concentrations are low, but it decreases with the increase of high RE concentrations in soils. The NOEC (no observed effect concentration) of the extraneous RE to available N in the soils is 443.8 mg·kg -1 . Under the inundated condition, low RE concentrations in soil has no significant effect on soil ammonium N and hydrolysable N. However, when the soil RE concentrations are high, both of them decrease with the increase of RE concentrations. The NOEC of the extraneous RE to soil ammonium N and hydrolysable N are 171.2 and 256.9 mg·kg -1 , respectively.The effect of rare earths (RE) on fractionation and transformation of available nitrogen in a yellow cinnamon soil was studied with soil cultivation. The results show that under the dry condition, when the extraneous RE are added to the soil, both concentrations of soil ammonium N and hydrolysable N increase, and the concentrations of soil nitric N decrease. The concentrations of soil available N increase with the increase of RE concentrations in soils when the RE concentrations are low, but it decreases with the increase of high RE concentrations in soils. The NOEC (no observed effect concentration) of the extraneous RE to available N in the soils is 443.8 mg·kg -1 . Under the inundated condition, low RE concentrations in soil has no significant effect on soil ammonium N and hydrolysable N. However, when the soil RE concentrations are high, both of them decrease with the increase of RE concentrations. The NOEC of the extraneous RE to soil ammonium N and hydrolysable N are 171.2 and 256.9 mg·kg -1 , respectively.

关 键 词：PEDOLOGY NITROGEN TRANSFORMATION yellow cinnamon soil rare earths 

分 类 号：S153[农业科学—土壤学]