UV-B辐射增加对小麦的影响

通过观测，分析了UV—B辐射增加对小麦生长发育的影响，计算了UV—B增加条件下对作物群体生产力生态特征值发生变化的情况。分析结果表明，UV—B辐射增加影响小麦生长发育表现在：生育期推迟，叶面积、分蘖和开花数减少，植株矮化，绿叶数、单株干物重、叶重、穗重等减小；影响小麦群体生产力表现在：群体生长率、相对生长率、叶面积指数、叶日积、净同化率都在生育期的中后期有很大幅度的减小，从而使小麦每亩株数、每株穗数、每穗粒数、千粒重也明显下降，最终影响到小麦群体生物学产量及经济学产量。

Effect of Enhanced UV-B Radiation on Wheat

Based on the observational data,the effect of enhanced UV-B radiation on the growth of wheat is investigated and the ecological feature of the plant community productivity is calculated under the condition fo UV-B enhancement.The results show that this effect is mainly displayed in delaying plant growth,reducing leaf area,tiller and number of flowering,shortening plant height,decreasing the number of green leaves,the weight of dried stuff,leaf and ear.In addition,it also affects the productivity of wheat such as its community growth rate,comparative growth rate,leaf area index,daily leaf accommulation,net assimilation rate,all of which are decreaed significantly in the middle and late stages of its growing period.As a result,the number of wheat plant per unit area,the ear number of single plant,the grain number per ear and the weight of 1000 grains are reduced substantially,which influences the yield product of biology and economy of wheat community.