摘要
试验证明，雨季采用苗高大于２０ｃｍ的容器苗造林，平均成活率可达８４．４％。非雨季容器苗造林，加入吸湿剂后成活率亦可达７０％以上。容器苗造林成活率Ｙ与容器苗高ｘ＿１．根茎比ｘ＿２，吸湿剂用量ｘ＿２．造林季节ｘ＿４之间的回归模型为：Ｙ＝５２．２５４７＋０．１５０７ｘ＿１一０．１５３０ｘ＿２＋２．０１９８ｘ＿３，＋１８．４４９９ｘ＿４容器苗造林的有效投资为：Ｄ＝ｆ／（Ｗ＿总）／Ｙ＝（１．７０１８＋０．２４３ｈ＋０．２４３ｔ＋ｎ＋０．１Ｇ）／ＹＤ：有效投资；ｆ（Ｗ＿总）：直接投资；Ｙ：造林成活率；ｈ：容器袋高；ｔ：造林季节；ｎ：吸湿剂用量；Ｇ：使用农药次数。
This paper showed that the height of seedling was most important in several fac-tors. When height was more than 20cm,the survival rate was 88.2%; When height was 5.8cm,the survival rate was 62.2%,If the.seedlings(height> 20cm)were planted undertheconditions which had not irrigation after rain,the mean survival rate should reach 84.4%, Ifthe desicant was applied during the dry seasons(April-Hune),the survival rate of seedlingshould be promoted by 20%,and that would reach more than 70%,On the moving desert,thesurvival rate of container seedling was only 10%一30% or so. A regression model was givenas follows: Y=52.2547+0.1507x_1+0.1530x_2+2.0198x_2+18. 4499x_4 Y: Survival rateof plantation x_1:height of tree x_2 : root-to-stem ratio x_2:.amount or desiccant x_4: time of planting This model can be used in monitor and control of survival rate, In addition,another mod-el was given as follows: D=f(W)/Y D: effective imnvestment in planting f(W): direct investment in planting Y: survival rate of plantation This.model.showed that raising of survival rate can reduce investment cost in plantaton.
关键词
梭梭
容器苗
造林
吸湿剂
Cakcayr container seedling
artificial reforestation desiccant mathematical model
