灌水强度对毛乌素沙地樟子松苗木生长的影响

Effects of Irrigation Intensity on Seedling Growth of Pinus sylvestris var.mongolica in Mu Us Sandy Land

为探讨不同灌水强度对樟子松人工林动态生长及生产力的影响,通过田间灌水试验对樟子松苗高、地径进行了模拟。结果表明:(1)对生长模型中理论生长上限、生长增速点、生长减速点、速生点和速生期等5个具有生物学意义的指标进行不同灌水处理间的多重比较,灌水强度主导的参数差异性使樟子松苗高和地径生长模型具备了多形性。(2)灌水强度为自然降水量3倍时苗高年生长量最大。

In order to inquire into the effects of different irrigation intensity on the dynamic growth and productivity of Pinus sylvestris var.mongolica plantation,the seedling height and ground diameter of Pinus sylvestris var.mongolica were simulated by field irrigation experiments.The results showed as the following two aspects.(1)Multiple comparisons between different irrigation treatments were carried out on five biologically significant indicators in the growth model,including theoretical growth upper limit,growth acceleration point,growth deceleration point,fast-growing point and fast-growing period.The difference of parameters dominated by irrigation intensity made the growth model of seedling height and ground diameter of Pinus sylvestris var.mongolica have polymorphism.(2)When the irrigation intensity was three times of the natural precipitation,the annual growth of seedling height was the largest.