增强的UV-B辐射对麦田生态系统中种群数量动态的影响

摘要

研究了大田栽培和自然光条件下，模拟UV-B辐射(UV-B，280～315nm)增强对麦田生态系统杂草、大型土壤动物和麦蚜种群数量动态的影响。在UV-B辐射下，杂草和大型土壤动物的种类和数量降低，物种多样性改变，杂草总生物量也降低。UV-B辐射降低麦蚜复合种群数量，并与麦叶粗纤维、可溶性蛋白、可溶性糖、Mg和Zn含量有显著的相关性。UV-B辐射还导致麦蚜与麦叶Mg、Fe和Zn含量均显著增加。%Influences of enhanced ultraviolet radiation(UV-B,280～315nm)on population quantity dynamics of weeds,soil macroanimals and wheat aphids in the wheat field ecosystem were investigated,Under UV-B radiation,species number and population quantity of weeds and soil macroanimals decreased,species diversity changed,total biomass of weeds reduced.UV-B radiation decreased population quantity of wheat aphids,which were significantly correlated with HCel,soluble protein content,CHO and the concentrations of Mg and Zn in wheat leaves.UV-B radiation resulted in significant increase of the concentrations of Mg,Fe and Zn in wheat aphids and wheat leaves.