田间增强UV-B辐射对麦田生态系统K营养和累积的影响  

Effects of enhanced UV-B radiation on nutrients and accumulation of K of wheat field ecosystem

作　　者：李元[1] 王勋陵[1] 

机构地区：[1]兰州大学生命科学学院

出　　处：《西北植物学报》2001年第2期313-317,共5页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金!资助项目 ( 39670 1 32 ;39760 0 2 1 )

摘　　要：研究大田栽培和自然光条件下 ,模拟 UV- B辐射 (UV- B,2 80～ 31 5nm)增强对麦田生态系统 K营养和累积的影响。 UV- B辐射显著影响春小麦不同生育期各部位 K含量和群体 K累积 ,并显著降低群体 K总累积。在 5.31 k J·m- 2 UV- B辐射下 ,春小麦群体 K总累积的降低最显著。 UV- B辐射降低春小麦群体 K输出 ,标志着麦田生态系统 K产投比降低 ,K循环功能下降。麦田土壤速效 K含量增加是春小麦群体 K输出降低的结果 ,并将导致土壤库中 K储量的增加。Influences of enhanced ultraviolet radiation (UV B, 280~315 nm) on nutrients and accumulation of K of wheat field ecosystem were investigated under field conditions.UV B radiation affected significantly concentrations and accumulation of K in various plant parts,decreased significantly accumulation of K in whole plant of spring wheat colonies.5.31 kJ·m -2 UV B radiation had the greatest decrease in accumulation of K in whole plant.UV B radiation reduced output of K of spring wheat colonies,might indicate decreases in output input ratio and cycling function of K in wheat field ecosystem.Increases in available concentrations of K in soil were the results of decreases in output of K of spring wheat colonies,might lead to occur higher storage of K in soil.

关 键 词：UV-B辐射 麦田生态系统 K 营养 累积 钾 

分 类 号：S512.101[农业科学—作物学] Q945.1[生物学—植物学]