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从干物质生产和分配的角度研究了短期和长期水分欠缺对大豆生长给以何种影响。其结果如下:1.叶面积/根干物质重比,在水分欠缺的条件下小;在高水分条件下大。土壤水分由一方向另一方变化时,其比值则迅速地适应新条件而变化。2.水分欠缺时间短时,叶面积和茎的生长则明显受到抑制。并且,干物质向叶的分配率变低,而向茎的分配率增高。相对生长率(RGR)和净同化率(NAR)明显下降。3.水分欠缺时间长时,叶面积和茎的生长有相当的恢复。干物质向叶的分配率、RGR、NAR也有相当程度的恢复。4.上述表明,这种适应性,即在于物质生产上产生的水分欠缺适应性,是以光合作用机能和在叶展开过程中的适应性为基础的。
From the perspective of dry matter production and distribution, we have studied the effects of short-term and long-term water deficits on soybean growth. The results are as follows: 1. Leaf area / root dry matter weight ratio, under the conditions of lack of water is small; under high moisture conditions. When soil moisture changes from one side to the other, its ratio rapidly changes to adapt to the new conditions. 2. Shortage of water short time, leaf area and stem growth was significantly inhibited. In addition, the distribution rate of dry matter to the leaves becomes low, and the distribution rate to the stems increases. Relative growth rate (RGR) and net assimilation rate (NAR) decreased significantly. 3. When the water is deficient for a long time, leaf area and stem growth have considerable recovery. Distribution of dry matter to the leaves, RGR, NAR also have a considerable degree of recovery. 4. The above shows that this adaptation, that is, the lack of adaptability to the water produced in material production, is based on the function of photosynthesis and the adaptability to leaf development.