滇西北黄背栎林生物量和净第一性生产力的初步研究

A preliminary Study on Biomass and net Primary Productivity of Quercus pannosa Forest in Northwest Yunnan Province,China

采用经典的维量分析法，对滇西北黄背栋林的生物量和净第一性生产力作了初步的研究。发现黄背栎林生物量和净第一性生产力都比较高，生物量３５４．４７６ｔ／ｈｍ￣２、净第一性生产力１７．５６６ｔ／ｈｍ￣２·ａ。认为黄背栎的丛生特性使其森林乔木层密度较大，从而导致较大的生物量和净第一性生产力。但是，黄背栎林为单优势森林，林下更新差，应加强保护以开发林副产品。

The biomass and net primary productivity(NPP)of Quercusponnosa forest which locates in Northwest Yunnan Province China with 28°05′N and99°40′E,and an elevation 3480 m is studied with the dimension analvsis method.Thetotal biomass and NPP is 354. 76 t/ hm￣2 and l7.566 t/hm￣2·a. respictively. of the totalbiomass and NPP,the first tree layer which is only composed of Quercus ponnosa shares97.26 % and 96.08 %,the shrub layer which is mainlv composed of Rhododendron,Lyonia,Lonicera, and the young trees of Picea brachytla var.complanata and Abtesgeorgei shares 1.98% and 2.71 %,and the herbaceous laver 0.23% and 1. 74% (and thebiomass of litter shares 0.50 %).The tree laver biomass and NPP allocate differentlv toorgans,i,e, 60.00% and 29.97% to stem wood, 6.51 % and 6.61% to stem bark, 8. 87% and 16.88% to branches,2.56% and 20.14% to leaves,12. 82% and l2. 30% toroot necks,and 9.40 % and 14.10%to root svstem. To the total biomass and NPP ofstand, 97.29% and 96.08% is contributed by Quercus ponnosa.