论文部分内容阅读
一、福建发展龙眼的生态优势自福州至漳州,长约300公里,宽约20-30公里的狭长地带盛产龙眼,被称为福建龙眼生产的“黄金地带”;这一地带气候温暖,雨量充沛,构成一个典型的南亚热带气候区.年均温19-21℃,最冷月均温10-13℃,绝对最低气温0℃以上,年雨量1000-1600毫米,无霜期300-340天.所有这些正是龙眼生长发育所需的条件.龙眼性喜温、喜湿、忌浸;2-3月间当花芽分化期又喜低温(幅度0-13℃内温度越低越有利)、低温(估计土壤含水量应不低于10%),忌冻(-4℃).如果花芽分化期出现持续经旬14℃以上的日均温又加多雨,便会出现明显的“冲梢”现象,已完成生理分化的花芽仍会转变成叶芽,当年的产量便要受到显著的影响.广东农民有“当日荔枝”背日龙眼“谚语,说明龙眼是较耐阴的.福建龙眼主产区的光照时数为1880-2200小时,这对龙眼的正常生活已十分足够,适当密植,多留结果枝,是可行的.
First, the ecological advantages of the development of longan in Fujian From Fuzhou to Zhangzhou, about 300 km long and 20-30 km wide strip long rich in longan, Fujian longan production is known as the ”golden zone“; this zone has a warm climate, Rainfall is abundant, forming a typical southern subtropical climatic zone with an average annual temperature of 19-21 ℃, the coldest month average temperature of 10-13 ℃, the absolute minimum temperature of 0 ℃ above the annual rainfall of 1000-1600 mm, frost-free period of 300-340 days. All of which are the conditions required for the growth and development of longan Longan hi, warm wet, avoid dipping; 2-3 months when the flower bud differentiation and like low temperature (amplitude of 0-13 ° C lower temperature is more favorable), low temperature (Estimated soil moisture should be not less than 10%), avoid freezing (-4 ℃) .If the flower bud differentiation period appears to persist for more than 14 ℃ daily average plus more rain, there will be obvious ”Phenomenon, has completed the physiological differentiation of flower buds will still be transformed into leaf buds, then the output will have to be significantly affected. Guangdong farmers have“ the day litchi ”longan " saying that longan is more shade-tolerant. Longan main producing areas of light hours 1880-2200 hours, which is the normal life of the longan has been very adequate, close planting, leaving more results Branches, is feasible.