UV—B辐射对田间春小麦生物量和产量的影响

研究了大田栽培和自然光条件下，模拟ＵＶ—Ｂ辐射（ＵＶ—Ｂ，２８０～３１５ｎｍ）增强对春小麦生物量累积和产量的影响及评估。ＵＶ—Ｂ辐射导致叶、茎、根、穗生物量和总生物量累积降低，生物量分配改变，籽粒产量降低。５．３１ｋＪ／ｍ２ＵＶ—Ｂ辐射处理还明显降低收获指数。模型分析表明，ＵＶ—Ｂ辐射降低总生物量累积速率，总生物量随ＵＶ—Ｂ辐射增加而降低。预测模型表明，１０％和２０％的臭氧衰减导致的ＵＶ—Ｂ辐射增加使籽粒产量、叶和穗生物量明显降低，而根生物量降低较小。

Effect of Enhanced UV-B Radiation on Biomass Accumulation and Yield of Spring Wheat Colonies and Assessment under Field Conditions.

Influences of enhanced ultraviolet radiation (UV-B,280315 nm) on biomass accumulation of spring wheat colonies were investigated and assessed under field conditions. UV-B radiation resulted in decrease of biomass accumulation of leaves, stems, roots, spikes and whole plant, changes in the patterns of biomass partitioning, and reductions in grain yield. With 5.31 kJ/m2 UV-B radiation, HI decreased significantly. Model analyses indicated that UV-B radiation could decrease the accumulation rates of total biomass. The total biomass and aboveground biomass reduced with the increase of UV-B radiation. Predictor models show that enhanced UV-B radiation resulting from 10% and 20% depletion of global ozone have had great influence on the decrease of grain yield and boimass of leaves and spikes, and did not have great influence on the reduction of root biomass.