冬小麦群体根系^(32)P吸收活力与群体光合速率关系的研究

Study on the Relationship between32P Absorption Vigour of Root Population and Canopy Apparent Photosynthetic Rate in Winter Wheat

利用同位素示踪技术,研究了冬小麦（鲁麦14）群体根系吸收活力和群体光合速率变化动态之间的关系。结果表明:返青到成熟,冬小麦群体根系^(32)P吸收活力与群体光合速率符合回归方程y=2.050+1.641x（r=0.8163）;群体根系^(32)P吸收活力与根层~14C光合产物集运速率显著相关（r=0.9629）,其变化主要受根层、茎层、叶层^(32)P矿质集运速率的影响;群体光合速率的变化与根层、茎层和叶层的^(32)P矿质集运速率之间的关系都极为密切,其变化显著受根层^(14)C光合产物集运速率的影响;根层、叶层和穗层的^(14)C光合产物集运速率与其^(32)P矿质集运速率的变化之间关系密切。

The trend of root population absorption vigour(RPAV) and canopy apparent photo-synthetic rate(CAPR) and the relationships between them on winter wheat (variety: Lumai 14) which was planted on pondlets were studied by using isotope tracer and canopy photosynthesis measurement techniques.The results showed that the change of root population 32P absorption vigour is significantly related to canopy apparent photosynthetic rate (r=0. 8163*), its optimum regression equation is y=2. 050 + 1. 641x. The 32P RPAV related to 14C photosynthate accumulation rate of root significantly (r=0.9629**), and its change is mainly influenced by 32P mineral accumulation rate of roots, stems and leaves. The change of CAPR is significantly related to roots, stems and/or leaves 32 P mineral accumulation rate , respectively . And its change is significantly influenced by the 14 C photosynthate accumulation rate of roots . There are close correlations between 14C photosyn-thate accumulation rate and 32 P mineral accumulation rate of roots , leaves and spikes respectively .