思茅松种子与农作物种子混合撒播造林试验研究

思茅松种子与农作物种子混合撒播造林，其发芽率（播种2个月）为75．70％，与直播造林没有显著差异；幼苗成活率（0．5a）和保存率（1．5a）明显低于直播造林。但是随着林龄的增长，差异越来越小，到幼树阶段（2．5a）时保存率为3．82％．只比同期直播造林的保存率低0.29％，到3a以后，保存率几乎一样。同时思茅松种子与4种农作物种子混合撒播造林的发芽率几乎一样。与4种农作物种子混合撒播造林对思茅松幼苗成活率和幼树保存率影响较大，其中与旱稻、玉米种子混合撒播造林时幼苗成活率明显高于与黄豆和花生混合撒播。混合撒播造林有利于思茅松生长，其树高和地径的生长量都高于直播造林。其中与旱稻混合撒播造林的思茅松生长最快。进行抚育管理的林地恩茅松的保存率和幼树的生长量都明显高于未进行抚育管理的林地，特别是到林龄为2．5a时，其差异更为显著。此外，混合撒播造林不但有利于思茅松幼树生长和提高其成活率，而且有较好的经济效益。

A Study on Direct Sawing Plantation of Pinus khasya mixed with Seeds of Crops

The germination percentage of Pinus khasya var Lanbianensis reaches to 75.70% through spread semi-nation sawing (after 2 months) that is mixed with seeds of crops. The data shows there is no significant difference compared to the direct semi-nation. Though the survival rate (0.5a) and the survival percent of seedling (1.5a) are lower than direct semi-nation significantly, the difference becomes insignificant as time goes by. Its survival percent of seedling is 3.82% in young tree stage that is only 0.29% less than direct semi-nation at the same time. After 3a, both the survival rate is almost same to each other. On the other hand, the germination percentage of Pinus khasya mixed with four different crops seeds has no difference, and they all have great influence on survival rate and survival percent of seedling at young tree stage. Among four crops seeds, the survival percent of Pinus khasya mixed with upland rice and corn is significantly higher than it mixed with soybean and peanut.Pinus khasya can benefit from spread semi-nation sawing mixed with crops seeds, and its increment of both tree height and basic diameter are higher than direct semi-nation. Among them, Pinus khasya grows fast mixed with upland rice through spread semi-nation sawing. Other data also shows the survival rate and increment of young tree in plantation by tending management are significantly higher than that without tending.Especially at 2.5a, the difference becomes more significant. Moreover, not only can spread semi-nation sawing of Pinus khasya mixed with crops promote young tree growth and survival rate, but also it can bring high economic efficiency.