苦草对NH_4~＋的吸收动力学

以苦草为试验材料,研究了3种光照、3种pH和3种温度条件下苦草对NH4＋的吸收动力学以及苦草根叶的吸收差异。结果表明：弱酸性组（pH5.5）最大吸收速率和亲和力显著高于中性组（pH7.0）和弱碱性组（pH8.5）;亲和力随照度增大而增大,但中等光强组的最大吸收速率显著高于其他2组;温度试验中,最大吸收速率和亲和力先随着...

Ammonia Uptake Kinetics of a Submerged Macrophyte Vallisneria natans

In order to investigate the effect of light, pH and temperature on ammonia uptake ability of Vallisneria natans, this paper studied the effects of three levels, pH, temperature and light on the ammonia uptake kinetics of nitrogen. In weak acidic（pH 5.5）, the affinity and maximum ammonia uptake rate of V.natans is much higher than the other two groups（pH 7.0 and pH 8.5）. In the experiments on light, the affinity increased with increasing illumination, but the maximum ammonia uptake rate is higher only at medium illumination. In the experiments on temperature, the affinity and maximum ammonia uptake rate is increasing with the temperature at first, and then decreased when the temperature is higher. The Leaves had a majority of the NH＋4 absorbed by the plant, and so the 3 environmental factors mentioned above exert more influence on leaf other than root on absorption of NH＋4.