福建南平人工林与天然林乐东拟单性木兰生长过程比较

Comparison of growth dynamics of Parakmeria lotungensis between plantation and natural forest in Nanping,Fujian,China

对福建南平人工林与天然林中的乐东拟单性木兰生长规律进行比较研究,结果表明,29年生乐东拟单性木兰人工林林分密度、平均胸径、平均树高和平均单株带皮材积分别为1425株.hm-2、18.30 cm、16.20 m和0.19736 m3;天然林中99年生乐东拟单性木兰平均胸径、平均树高和平均单株带皮材积分别为40.20 cm、19.50 m和0.91212 m3。29年生乐东拟单性木兰人工林生长量远高于同龄天然林,树高、胸径的连年生长量和平均生长量高峰均比天然林早,峰值也比天然林大。天然林中的乐东拟单性木兰早期生长较慢,但后期生长量大,99年生单株材积平均生长量和连年生长量均高于人工林29年生。乐东拟单性木兰是一种生长速度较慢的树种。

Growth dynamics of Parakmeria lotungensis in a plantation and a natural forest in Nanping, Fujian, China were compared and investigated. The results showed that stand density, mean diameter at breast height （DBH）, tree height and single-tree volume were 1425 stem · hm^-2, 18.30 cm, 16.20 m and 0.19736 m^3 · stem^-1 , respectively, for the 29-year-old P. lotungerub trees in the plantation forest. DBH, tree height and single-tree volume were 40.20 cm, 19.50 m and 0.91212 m^3 · stem^-1, respectively, for the 99-year-old P.lotungens/s trees in the natural forest. Tree growth of the P. lotuagerub in the 29-year-old plantation forest was much higher than in the natural forest of the same age. Growth peak of current annual increment and mean annual increment of tree height and DBH of P.lotungensis in the plantation forest came earlier and had higher peak values than those in the natural forest. P. lotungensis trees in the natural forest had lower growth rate in the early stage, but had higher growth rate in the latter stage. Mean annual increment and current annual increment of single-wee volume of the P. lotungensis in the 99-year-old natural forest were high-er than those in the 29-year-old plantation forest. P. lotungensis a slow-growing tree species.