小麦根系主要生态效应的研究

通过小麦根系对土壤水分、施肥深度和气温变化等生态效应的研究表明：小麦根系生长的适宜土壤相对含水量为７０％～８０％，低于６０％，明显受抑制，在小麦抽穗开花期，根系生理活性对土壤水分的反应最明显；气温变化通过植株生长，会引起根系迅速地反应出来。根系对秋、冬季和春季温度变化的反应有显著区别；土层施肥可使根系早期生长健壮，利于壮苗，深层施肥可促使下层根量增多。用￣（３２）Ｐ示踪试验证明，在一些分蘖死亡的情况下，其基部着生的根仍继续保持着生活能力，而且对整个植株同样起着根的应有作用。

Study on the Main Ecological Effects of Wheat Root Systems

The study on the main ecological effects of wheat root systems was carried outfrom 1988 to 1992.The results showed that 1. The relative soil water content suitable tothe development of root systems was 70%to80%. When it was below 60%,the growth ofroot systems slowed down significantly;when below 30%,the root systems stopped grow-ing or died,2.The root systems were highly sensitive to the fluctuation of temperaturewhich affected the growth rate of root systems. 3.The applying of fertilizer on the surfacelayer would stimulate strong growth of the root systems in the early stage,while the ap-plying of fertilizer to thdeeper layer woucd lead to the increasing of roots in the deeper lay-er