不同根区温度对冬小麦生长发育及养分吸收的影响

以Hoagland营养液为介质,采用自制的恒温培养系统研究了不同根区温度对冬小麦生长发育以及N、P、K养分吸收的影响。结果表明:小麦冬前至返青期低温处理明显抑制根系发育,根长、根体积、根系生物量、叶面积、地上部生物量、养分累积量均比常温处理显著降低,其中越冬前低温处理对地上部的影响大于对根系的影响,而返青期低温处理对根系的影响大于地上部;越冬前和越冬期高温促进了根系生长,但地上部生物量和养分累积量呈降低趋势,返青期高温抑制了根长和根体积的增加,但有促进地上部生长的作用。

Effect of different root zone temperature on growth development and N, P and K uptake of winter wheat

A pot experiment was conducted to investigate the effect of different root zone temperature on growth de- velopment and N, P and K uptake of winter wheat in Hoagland solution. The results showed that low temperature re- strained root development during pre-winter stage, winter period and tuming green stage. Root length, root volume, root biomass, leaf area, shoot biomass , nutrient uptake of low temperature treatments decreased significantly compared to nor-mal temperture treatments. Aboveground part of winter wheat was more sensitive to the decrease of root zone temperature than root during pre-winter stage. The reverse was true during tuming green stage. High temperature improved root growth while it trended to reduce shoot biomass and nutrients uptake during pre- winter stage and winter stage. High tem-perature reduced root length and volume while improved aboveground part growth of wheat during turming green stage.