3种因素对油松移植苗根系活力的影响

采用盆栽的方法，以3种不同的光照条件、土壤含水量及苗木含水量，对4 a生油松（Pinus tabulaeformis）移植苗进行处理，测定3种因素交互作用下油松移植苗的根系活力。结果表明：光照强度的降低、苗木含水率的减少及土壤含水量的增加，促使油松移植苗根系活力不断降低；油松移植苗的苗木含水量为63%或土壤含水量为30%时，自然光照下根系活力均显著大于遮光条件下根系活力；在自然光强、63%的苗木含水量及30%土壤含水量其中一种条件影响下，其他两个因素的变化均可引起根系活力的显著变化；在自然光强与53%自然光强条件下，或在土壤含水量为30%和50%条件下，苗木失水均导致根系活力降低。

Root Activity of Transplanted Pinus tabulaeformis Seedlings under the Interaction of Three Factors

Four year old transplanted Pinus tabulaeformis seedlings were grown in pots under the treatment of three different levels of natural light intensity, soil moisture content and seedling water content. The root activity of transplantedP. tabulaeformis seedlings under the interaction of three factors was studied. The results showed that the root activity of transplanted P. tabulaeformis seedlings was reduced gradually with the decrease of natural light intensity and seedling water content and the increase of soil moisture content. The root activity of transplanted P. tabulaeformis seedlings under natural light was significantly higher than that under shadow when seedling water content was 63% or soil moisture content was 30%; when the transplanted seedlings were under one of the conditions of natural light, 63% seedling water content or 30% soil moisture content, the root activity of transplanted seedlings was significantly changed with the change of other two factors; when the transplanted seedlings were under the natural light intensity and 53% natural light intensity, or 30% and 50% soil moisture content, the root activity was reduced with the seedling water loss.