地表臭氧含量增加和UV-B辐射增强对大豆生物量和产量的影响

Combination Effects of Elevated O_3 and Enhanced UV-B Radiation on Biomass and Yield of Soybean

利用开顶式气室(OTC)设置4个处理对大豆进行O3与UV-B增强的大田试验,通过观测生物量和产量研究两者对大豆生长的影响。T1为O3含量100nmol/mol的处理,T2为UV-B辐射强度比CK增加10%的处理,T3为T1和T2的复合处理,CK为自然空气。结果表明,O3含量与UV-B辐射增强的单因素对大豆株高、叶面积、茎干重等生物量都有不同程度的负影响,而两者复合后对各生物量的影响效果不一致,在分枝期至结荚期拮抗作用居多,而协同作用则多出现在生育期末期。在整个生育期,各处理均表现为茎分配指数变化幅度较小,CK、T1、T2、T3的根和叶分配指数逐渐降低,且荚分配指数呈快速上升的趋势。由此可见,O3和UV-B辐射单因子胁迫对大豆生物量和产量均产生不同程度的负效应,而两者的复合作用并不是两个单独作用的简单累加。

Responses combination, were inv of soybean （Glycine max, Bayuehuang） to enhanced ozone, supplemental UV -B radiation and m estigated in this paper by using open - top - chambers（OTCs）. Four treatments were exposing to unfiltered air（ CK）, ozone content with 100nmol/mol（ T1 ）, UV - B radiation levels with 10% higher than control group （T2） and combination treatment （T3）. The results showed that the single factor ozone or UV radiation had different de- grees of negative effects on soybean height,leaf area, stem dry weight and other hiomass. Combined impact of two fac- tors was inconsistent, antagonism was showed mostly form branch period to pod bearing period, on the contrary, synergy was in the mayor role in the end of period fertility. The change of stem allocation index was relatively small, leaf and root allocation index was gradually reduced, and pod distribution index was rising rapidly under different treatments in the whole growth period. Thus, the single - factor stress of ozone or UV - B radiation on soybean biomass and yield was different degrees of negative effects, while the interactived effects were not equal to addition.