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马尾松是湖北省丘陵山区的主要造林树种。随着群众性造林运动的蓬勃发展,对优质的马尾松苗木需要量越来越大。可是湖北地区的气候特点是春雨连绵,夏秋干旱,加之大部分地区是酸性红(黄)壤,往往新育苗的圃地上的马尾松幼苗在5月中、下旬或6月上旬,雨量显著减少,连续几天高温干旱之后,针叶便逐渐失绿,初显暗红、然后转紫红或红黄色,出现“紫化”现象。马尾松苗一旦出现“紫化”现象后,在6-8月间,一直处于生长停滞状态,到初秋才逐渐返青,恢复生长。这样的苗木矮小嫩弱,不能出圃造林。造成苗木“紫化”的主要原因是土壤有效磷含量低微和缺乏与马尾松共生的菌
Masson pine is a major afforestation tree species in Hubei hilly area. With the vigorous development of mass afforestation, the demand for quality Pinus massoniana seedlings is growing. However, the climate in Hubei is characterized by spring rain, summer and autumn droughts, and acid red (yellow) soil in most of the areas. The rainfall of the masson pine seedlings on the nursery land of new nurseries is obviously reduced in the middle, late or early June, After a few days of high temperature and drought, the coniferous leaves gradually lost their green color, initially showing dark redness and then turning purple or reddish yellow, resulting in the phenomenon of “purple”. Masson pine seedlings once the “purple” phenomenon, in June-August, has been in a state of stagnation, until the early autumn gradually green, restore growth. Such a small seedling tender weak, can not nursery afforestation. Caused seedlings “purple” the main reason is the low content of soil available phosphorus and the lack of symbiotic bacteria with Masson