不同干热河谷生境对云南野生膏桐造林的影响

Effects of two kinds of habitats of river valleys on the forestation of wild Jatropha curcas in Yunnan

通过育苗方式在2种干热河谷生境进行膏桐苗木造林试验,结果表明:在膏桐苗木造林中,育苗方式(实生育苗和扦插育苗)差异比生境(南北走向的河谷西岸和东西走向的河谷南岸)差异产生的效应更大,是造林中更重要的因子,其中以实生苗苗木成活率较高,但扦插苗的发育速度比实生苗快;在光照辐射较低的生境条件下苗木的成活率较高且有利于苗木度过缓苗期,而光照辐射较强的生境条件却有利于苗木生长;此外,定植后实生苗对环境较不敏感,而扦插苗对环境变化较敏感,地径和树高呈极显著正相关关系,与苗木的质量相互协调。

In this forestation experiment, two ways of breeding young trees were test in the two kinds of habitats. The results showed that the difference of two ways of breeding young trees （seedling breeding and cutting propagation） could affected remarkably, compared with the difference of two kinds of habitats （the west bank of the north-south river valley and the south bank of the east-west river valley）. So the difference of two ways of breeding young trees was the more important facton. The survival rate of young trees by seedling breeding was higher, and the growing speed of young trees with cutting propagation was much faster. The survival rate of young trees in the habitat where there was lower solar radiation was higher. This was helpful for the young trees to spend transition period after transplant. The comparatively higher solar radiation was benefit to the growth of the young trees after transplant survival. Besides, the survival rate of seedlings were Insensitive to the change of the two kind of habitat, and the survival rate of young trees with cutting propagation were sensitive to the change of the two kind of habitat. There was positive correlation between ground diameter of trunk and height of the young trees at 0.01 significant level, which indicted that the body of the young trees were in harmony. This was benefit to the forestation production.