以平邑甜茶(Malus hupehensis var. pinyiensis Jiang)幼苗为试材,用过氧化钙和还原性铁粉控制根系分布区(根区)O2浓度,分析根系特征和干物质积累.结果表明,当根区O2浓度由17.47％～19.35％ (对照水平)降至14.03％～15.37％时,根系长度、根系表面积、根系分叉数、根系分形维数、根系活力、植株干物质积累量及根/冠比显著下降,降至10.51％～11.95％使幼苗在7 d内几乎全部死亡;根区增氧(增至21.24％～22.47％)显著促进幼苗生长发育和干物质积累,并显著增大根/冠比;根系对根区O2浓度的变化比地上部更敏感.
Effects of oxygen control in root-zone on the roots and the ratio of root to shoot of Malus hupehensis seedlings
In the present experiment, Malus hupehensis var. pinyiensis Jiang seedlings were selected to analyze root characteristics and dry matter accumulation after the root distribution zone (root-zone) oxygen concentration was controlled by calcium peroxide or reducing iron respectively. Experimental results showed that when the oxygen concentration in the root-zone changed from 17.47％-19.35％ (control) to 14.03％-15.37％, the total root length, the root surface area, the number of root branching, the fractal dimension, the root activity, the dry matter accumulation and the ratio of root to shoot significantly decreased. When the oxygen concentration in root-zone decreased to 10.51％-11.95％, all the seedlings died within 7 days. On the contrary, increasing oxygen concentration (21.24％-22.47％) in the root-zone significantly facilitated growth and development of seedlings and increased dry matter accumulation and the ratio of root to shoot. Roots were more sensitive to oxygen concentration changes in root-zone than the shoots.
oxygenMalus hupehensis var. pinyiensis Jiangrootratio of root to shootdry matter
NETL
NSTL
万方数据
维普
