Nitrogen Use Efficiency of Rice Under Cadmium Contamination:Influence of Rice Cultivar Versus Soil Type

作     者：ZHOU Yanli SUN Bo 

作者机构：State Key Laboratory of Soil and Sustainable AgricultureInstitute of Soil ScienceChinese Academy of Sciences Germplasm Bank of Wild SpeciesKunming Institute of BotanyChinese Academy of Sciences 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2017年第27卷第6期

页      面：1092-1104页

核心收录：

学科分类：12[管理学] 1204[管理学-公共管理] 082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 09[农学] 0901[农学-作物学] 120405[管理学-土地资源管理] 

基　　金：supported by the Modern Agricultural Industry Technology System of the Ministry of Agriculture of China(No.CARS-22-G-14) the Science and Technology Service Network Initiative of Chinese Academy of Sciences(No.KFJ-SW-STS-142) 

主　　题：crop-available N grain yield N uptake efficiency N assimilation efficiency soil available N 

摘      要：There is a need for rice cultivars with high yields and nitrogen(N) use efficiency(NUE), but with low cadmium(Cd) accumulation in Cd-contaminated paddy *** determine the relative effects of rice genotype, soil type, and Cd addition on rice grain yield and NUE, a pot experiment consisting of nine rice cultivars was conducted in two types of paddy soils, red soil(RS) and yellow soil(YS),without or with Cd spiked at 0.6 mg kg^(-1).The N supply was from both soil organic N pools and N fertilizers; thus, NUE was defined as the grain yield per unit of total crop-available N in the *** addition decreased grain yield and NUE in most rice cultivars,which was mainly related to reduced N uptake efficiency(NpUE, defined as the percentage of N taken up by the crop per unit of soil available N).However, Cd addition enhanced N assimilation efficiency(NtUE, defined as the grain yield per unit of N taken up by the crop) by 21.9% on average in all rice *** NpUE was mainly affected by soil type, whereas NtUE was affected by rice *** cultivars had higher NUEs than the japonica and indica cultivars because of their greater biomass and higher tolerance to Cd *** of NUE after Cd addition was stronger in RS than in YS, which was related to the lower absorption capacity for Cd in *** correspondence analysis-based variation partitioning showed that cultivar type had the largest effect(34.4%) on NUE, followed by Cd addition(15.2%) and soil type(10.0%).