Preliminary studies on the survival rate and growth characters of Pinus kwangtungensis seedlings
CHEN Zhen-ming1, GONG Yue-ning1, XIE Guo-guang1, WANG Hou-lin2, MIAO Shen-yu2
1. Administration Bureau of Naming National Nature Reserves of uangdong, Ruyuan 512727, China; 2. School of Life Sciences, Guangzhou University, GuangzJwu 510006, China
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 0.17 mm, 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.