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利用开顶式熏气室研究了大气CO2 浓度和土壤水分对禾谷缢管蚜Rhopalosiphumpadi (L .)种群动态的影响 ,并分析了禾谷缢管蚜密度与被处理小麦叶片化学成分的关系。结果表明 :(1)禾谷缢管蚜种群密度随CO2 浓度升高而持续增大并与土壤水分密切相关 ,各CO2 浓度下均以 6 0 %田间持水量时的密度最大 ;(2 )CO2 和土壤水分对小麦叶片化学成分有明显的影响 ,麦叶水分、可溶性蛋白质、可溶性糖、淀粉含量随CO2 浓度和土壤水分含量上升而增加 ,纤维素含量随CO2 浓度上升而增加、随土壤水分含量上升而降低 ,单宁、丁布 (DIMBOA)含量在CO2 浓度为 5 5 0 μl L时最高 ,但单宁含量随土壤水分上升而增加 ,丁布含量在 6 0 %田间持水量时最低 ;(3)禾谷缢管蚜密度与叶片水分、可溶性蛋白质、可溶性糖、淀粉含量呈正相关 ,与丁布、单宁含量呈负相关。结论 :在未来的气候条件下 ,随着CO2 浓度升高禾谷缢管蚜种群可能会持续增长 ,这种增长在半干旱区更加突出。禾谷缢管蚜种群增长的原因之一是大气CO2 和土壤水分条件改变了植物的化学成分构成。
The effects of atmospheric CO 2 concentration and soil moisture on the population dynamics of Rhopalosiphumpadi (L.) Population were studied using an open top smoked chamber. The relationship between the density of Aphis gossypii and the chemical composition of the treated wheat leaves was also analyzed. The results showed as follows: (1) Population density of M. avenophagus increased continuously with the increase of CO2 concentration and was closely related to soil moisture. The density of 60% field water content in each CO2 concentration was the highest. (2) CO2 And soil moisture significantly affected the chemical composition of wheat leaves. The contents of water, soluble protein, soluble sugar and starch in wheat leaves increased with the increase of CO2 concentration and soil water content. The content of cellulose increased with the increase of CO2 concentration. With the increase of soil water content While the content of tannin and DIMBOA was the highest at the CO2 concentration of 550 μl. However, the content of tannin increased with the increase of soil moisture, and the content of DIMBOA was the lowest at 60% of field capacity. ( 3) There was a positive correlation between the density of aphids and the water content, soluble protein, soluble sugar and starch content in leaves and negatively correlated with the contents of butyricin and tannin. Conclusion: Under the future climatic conditions, the population of Aphis gossypii may grow continuously with the increase of CO2 concentration, which is more prominent in the semi-arid area. One of the reasons for the increased population of M. avenae is that atmospheric CO2 and soil moisture conditions alter the chemical composition of the plant.