几种造林措施对墨西哥柏、银荆保存率及生长的影响

The Effects of Planting Measure on Survival Rate and Growth of Cupressus lusitanica A cacia dealbata

在呈贡劣质山地对墨西哥柏、银荆树植树造林进行了不同整地方式、植塘规格、种植密度、抚育方式的试验。结果：撩壕整地和水平台地的保存率及幼树生长量优于块状整地，且在阴坡深草地段尤为显著。３种植塘规格（６０ｃｍ×６０ｃｍ×６０ｃｍ，５０ｃｍ×５０ｃｍ×５０ｃｍ，４０ｃｍ×４０ｃｍ×４０ｃｍ）对墨西哥柏的保存率和高、径生长差异不显著，对银荆差异极显著，大塘优于小塘。３种种植密度（１．５ｍ×１．５ｍ，１．５ｍ×２ｍ，２ｍ×２ｍ），对幼林期的高、径生长及冠幅大小无显著影响，在３０°以上的陡坡，台地抚育优于菱形、扇形、块状抚育，与对照比较，４种抚育方式与之差异极显著。

Different site of soil method preparation,planting pit specification, planting den-sity and tending method are adopted in trail in Cupressue lusitanica and Acacia dealbataplantation located in the barren hills of Chenggong.The result demonstrats that the survi一val rate and the sapling's growth by trench and terrace soil preparation are higer and betterthan those through spot aoil praparation,which is specially obvious in dense grass groundin nothern and nothwestern hills;The effective pit specifications 60cm×60cm×60cm,50cm×50cm×50cm,and 40cm×40cm×40cm have little influence on the survival rate, heightand diameter growth of Cupressus lusitanica but very obvious on those of Acacia dealbatawith big spot being better than small ones; the three different planting densities,1.5m×1.5m,1.5m×2m,and 2m×2m produce little difference on height,diameter growth and thecrown size of the sapling;for the steep Slope above 30’c terrace tending is better thanrhomboid tending,fan一shap tending as wellas spot tending,and all the four tending method can produce obvious different result compared with the check methods。