晾晒对油松侧柏苗木活力的影响

Effect of Drying in the Air on Seedling Vigor of Platycladus orientalis and Pinus tabulaeformis

晾晒使苗木失水，失水引起其根系活力降低。在试验条件下，侧柏苗木（１－０型）水势与栽植成活率和初期生长量呈显著线性关系（Ｙ＝Ａ＋ＢＸ），油松苗木（１－０型）水势与栽植成活率和初期生长量则符合方程Ｙ＝Ａ＋Ｂ／Ｘ的变化规律。供试苗木保证造林成功的水势临界值应分别高于：油松（１－０型）苗－０４５Ｍｐａ。

Seedling desication are caused by drying in the air,which can,cause low root vigor.Controlled by trial, P orientalis (Linn.)Franco seedling (1-0 type) water potential is remarkably of linear reation to rate of planting survival and intital growth increments ( Y=A+BX ).That of P tabulaeformis carr.seedling (1-0 type) changing with water potential correspond to the change law of equation(Y= A+B/X ). The demarcate value of water potential that the seedling planting is successful is that P tabulaeformis carr.seedling(1-0 type) is -0.45Mpa and P orientalis (Linn.)Franco seedling (1-0 type) is -1.5Mpa