Growth of Pinus massoniana and broad-leaved tree mixed forest

Key words: 
• silviculture /
• interplantation in forest /
• Pinus massoniana /
• broad-leaved trees /
• mixed forest

Abstract: Interplanting broad-leaved tree species under the Pinus massoniana forest （masson pine，which planted in 1960），respectively Castanopsis lamontii，Cyclobalanopsis myrsinaefolia，Castanopsis kawakamii，and Castanopsis sclerophylla in 1984，coniferous and broad-leaved mixed multiple layers were formed. The tree height and diameter at breast height （DBH） of the four broad-leaved tree species were measured every two years from the forth year. In the 16th year （2000），masson pines tree height，DBH，and timber volume were measured. The results showed that：current annual increment in tree height reached maximum，Castanopsi slamontii in the 14th year，Cyclobalanopsis myrsinaefolia in the 4th year，Castanopsis kawakamii in the 6th year，and Castanopsis sclerophylla in the 12th year；the DBH annual increment reach peak respectively in the 10th，8th，10th，and 8th year in order. Different broad-leaved tree species showed different growth rates，which in order of Castanopsis kawakamii ＞ Cyclobalanopsis myrsinaefolia＞ Castanopsis sclerophylla ＞ Castanopsis lamontii. Interplanting Castanopsis sclerophylla is more beneficial to the growth of masson pine. In the 16th year，masson pine had 23.1 m height，31.1 cm DBH，and 0.536 m3 timber volume.［Ch，4 fig. 1 tab. 7 ref.］