广东松幼苗存活率和生长特征的初步研究

2006年5月至2008年7月,在南岭国家级自然保护区测定了不同年龄、不同种植方式的广东松(Pinus kwangtungensis)幼苗的存活率、株高和基径等指标,以期为国家保护植物广东松的保育提供资料。结果表明,实验期间袋栽苗存活率下降明显,从开始时的100%下降到结束时的50%;裸植苗与移植苗的存活率从100%下降到80%左右。总月均株高、基径的增量,袋栽苗、裸植苗、移植苗依次为1.01、1.39、2.76cm;0.17、0.20、0.64mm。年均株高、基径增值,移植苗、裸植苗、移植苗依次为32.91、17.22、12.77cm;7.64、2.31、2.0mm。随着年龄的增长,各组幼苗的株高和基径增长均加快,株高与基径之间存在着极显著的线性相关关系,广东松幼苗至10a生仍属快速生长期。

Preliminary studies on the survival rate and growth characters of Pinus kwangtungensis seedlings

To provide some basic data for raising and protecting the national key protected wild plant of Pinus kwangtungensis,the survival rate, stem height and stem base diameter of the plant seedlings of different ages cultivated in different ways were determined from May, 2006 to July, 2008 in Nanling National Nature Reserves. Results showed that the survival rates of the seedling groups cultivated in nutrient bags decreased from 100% at the beginning of May, 2006 to 50% by the end of experiment in July, 2008; meanwhile, the rates of the seedlings cultivated in soil and seedlings (transplanted) from the nature P.kwangtungensis community decreased from 100% to about 80% at the beginning to the end of experiment. Total monthly increments of plant height and stem base diameter for root-bagged seedlings were 1.01 cm and 1.39 cm, for non-bagged seedlings 2.76 cm and 0.17mm, for transplanted seedlings 0.20 mm and 0.64 mm. Annual increments of plant height and stem base diameter for root-bagged seedlings were 12.77 cm and 17.22 cm, for non-bagged seedling 32.91cm and 1.97mm, for transplanted seedlings 2.31 mm and 7.64 mm. As the seedlings grew, the stem height and stem base diameter of the plants increased rapidly. A significantly positive relationship between plant height and stem base diameter of the seedlings was found,and the seedlings of P. kwangtungensis grew rapidly up to the age of 10 years.