引种沙地海岸松(Pinus pinaster Ait.)幼苗对环境因子的响应

Response of the introduced seedling of Pinus pinaster Ait. to the environmental factors in Shandong and Zhejiang provinces

通过对沙地海岸松种子萌发和育苗试验的研究,结果表明:正交试验可提高沙地海岸松种子萌发率,在实验室的最优组合分别是基质土,无菌根,1d喷水1次;在苗圃的最优组合是覆土厚度1cm,1d喷水1次,栽植密度800株/m2;生根粉及其浓度对沙地海岸松种子萌发率的影响不同,GGR生根粉在10mg/kg浓度下的发芽率最高,其次依次为GGR 40mg/kg、ABT40mg/kg和GGR 25mg/kg。沙地海岸松的第1个生长季共分四个时期;在第1年和第2年的生长中,其高生长都出现了二次生长高峰期;从幼苗的高与地径生长来看,裸根苗均高于容器苗,浙江引种地的幼苗均高于山东的幼苗;法国种源在引种地的生长表现比西班牙种源要好;沙地海岸松耐盐性强,且在养分含量高、偏酸性土壤中生长占优势。

The objective of this paper is to study the response of the introduced Pinus pinaster Air. seedlings to the environmental factors. Some of the suitable conditions of seed germination and seedling growth have been considered. The results showed that the suitable conditons which can improve the seed germination percentage during the orthogonal design both in the nursery and laboratory are as followings, the substrate soil, non-mycorrhizae and irrigating once a day are key factors in the laboratory; covered with 1 cm soil, irrigating once a day and with the density of 800 stems/m2 are suitable combinations in the nursery. Different rooting powder and concentration treatments caused different seed germination percentage, using GGR 10mg/kg has highest seed germination percentage, the next are GGR 40mg/kg,ABT 40mg/kg and GGR 25mg/kg. There are 4 phases during the Pinus pinaster seedlings growth. In the first and second growing season, the height growth all showed two peaks. As to the total height growth and ground diameter growth, the bare-root seedlings are higher than the container ones; seedlings provenance from Zhejiang province have good performance than those from Shandong province. Also, the seedlings from France growth better than those from Spain ; Pinus pinaster has strong salinity tolerance and grows better in the soil with slight acid and higher nutrient content.