小麦/玉米间作作物根系与根际微环境的交互作用

Interaction of roots and rhizosphere in the wheat-maize intercropping system.

通过根箱模拟试验和水培试验,测定小麦/玉米间作条件下根系的分布与根际养分的含量,初步探讨了间作对作物根系分泌有机酸的影响。结果表明,间作显著提高了各层土壤中小麦根的重量,同时提高了小麦、玉米的根系数量和地上部生物量,使生长前期根系大小发生较大变化,而对根系活力影响较小。间作使玉米根际土速效N含量增加,速效P、K含量降低;使小麦根际土N含量降低,P、K含量提高。小麦与玉米间作以后,根系分泌有机酸的种类明显增加;而植株体内和根系中有机酸的种类和数量却有所降低。

Distributions of roots and rhizosphere nutrients were evaluated for wheat and maize intercropping system.The effects of intercropping on exudate of organic acid in the roots were discussed.Pot experiments and solution cultivation experiments were carried out.The results showed that intercropping increased growth of roots and their exudate of organic acid.It also made N content increase and P,K contents decrease in the rhizosphere soil of maize.On the contrary,the N content decreased and P,K contents increased in the rhizosphere soil of wheat.The effects of intercropping on the roots of wheat and maize were found quite distinct.