旱地施肥对春小麦根系生长、代谢的影响及促进水分有效利用的机理

本文采用田间可微区试验的方法,研究了施肥对旱地春小麦根系生长、根系活力的影响和根系特征量与土壤含水量的关系。结果表明:不同施肥处理使小麦根系的长度、重量、体积、表面积均有不同程度的增长,并使小麦根系活力增加。尤以N、P配合施用效果更好。施肥对小麦根系生长的促进作用可持续到小麦生育后期。施肥在促进小麦根系生长和代谢活力的基础上加大了小麦对深层土壤水分的利用;而且小麦根系总长度、总体积、总表面积及总的根系活力与该期土壤含水量呈极显著负相关,揭示了以肥调水的机理。

EFFECT OF FERTILIZATION ON ROOT DEVELOPMENT,ROOT METABOLISM OF SPRING WHEAT AND THE MECHANISM OF FERTILIZATION ON SOIL WATER UTILIZATION

Micro- plot experiment were conducted on upland soil in semi- arid region of Liaoning Province to study the effect of fertilization on root development, root vigor of spring wheat and the relations between some patameters of root and soil water content. The results showed that fertilization promotes root vigor of growth and it's length, weight, surface and volume were also accelerated, the N+P treatment has the best effect. The effect of fertilization on root system continued till the later growth stage of wheat. Due to the improvement of root growth and metabolism activity after fertilization, spring wheat can utilize more water from deeper soil layers, and showed especially significant inverse correlation between total root length, volume, surface, vigor, and soil water content, revealed the mechanism of fertilization on soil water utilization