CO_2浓度升高、氮和水分对春小麦养分吸收和土壤养分的效应  

Effects of CO_2 concentration enrichment, nitrogen and water on soil nutrient content and nutrient uptake of spring wheat

作　　者：李伏生[1] 康绍忠[2] 

机构地区：[1]广西大学农学院,广西南宁530005 [2]西北农林科技大学教育部旱区农业水土工程重点实验室,陕西杨凌712100

出　　处：《植物营养与肥料学报》2002年第3期303-309,共7页Journal of Plant Nutrition and Fertilizers

基　　金：国家重大基础研究计划项目 (G19990 1170 8);国家杰出青年科学基金项目 ( 4 972 5 10 2 )资助

摘　　要：研究了 2种CO2 浓度水平 ,2种土壤水分处理和 5种N肥施用水平对春小麦 (TriticumaestivumL cv DingxiNo 86 5 4)养分吸收和土壤速效养分的影响。结果表明 ,高CO2 浓度 (70 0 μmol·mol-1)明显降低春小麦对氮(N)的吸收 ,低N时降低更为明显 ,但对磷 (P)、钾 (K)吸收的影响不明显。小麦对N、P、K吸收 ,干旱处理明显比湿润处理低。CO2 浓度增高对土壤速效N的影响与土壤水分状况有关。湿润处理 ,CO2 浓度增加的处理速效N量比当前CO2 浓度的处理低 ;而干旱处理 ,施N 5 0、10 0、15 0mg·kg-1时 ,速效N则较高。高CO2 浓度对土壤速效P、K量的影响不明显 ,而低N和水分不足 ,土壤速效P。The study presented the effects of two atmospheric CO 2 concentrations (350 and 700 μmol/mol), two levels of soil moisture (wet and drought) and five rates of nitrogen fertilizer ( N 0,50,100,150,200 mg·kg -1 ) on soil available nutriet content and nutrient uptake of spring wheat (Triticum aestivum L cv. Dingxi No. 8654). Results showed that high CO 2 concentration significantly reduced N uptake of wheat, especially in low N treatment, but had little effect on P and K uptake of wheat. N, P and K uptake by wheat were significantly lower in well\|watered treatments compared with in drought treatments. The effects of CO 2 increased on soil available N depended on soil water status. In well\|watered treatment, soil available N content was lower in the enriched CO 2 treatment compared with in the ambient CO 2 treatment, while in drought treatment, soil available N content was greater applied with N 50, 100, 150 mg·kg -1. High CO 2 concentration had little effect on soil available P and K content, but soil available P and K content were significantly greater at low N supply and insufficient water condition than at adequate N and water under adequate P and K supply.

关 键 词：CO2浓度升高 水分 春小麦 养分吸收 土壤养分 氮肥 土壤速效养分 

分 类 号：S512.12[农业科学—作物学]