滇西北高山松林生物量的初步研究

A PreliminaryStudy on Biomass of Pinus densata Forests in Northwest Yunnan Province,China

本文研究了滇西北高山松林的生物量。林龄大生物量减小。林龄约４０年和１００年的林分，生物量分别为２９４．３０６ｔ／ｈｍ￣２和２３１．４９５ｔ／ｈｍ￣２；在各器官中，树干生物量（１４３．５３２ｔ／ｈｍ￣２和１０２．１２０ｔ／ｈｍ￣２）最大，占群落总生物量的４８．９０％和４４．２４％；乔木一层（亦即高山松）的生物量２５４．２８３ｔ／ｈｍ￣２和１７１．４０８ｔ／ｈｍ￣２，占群落总生物量的８６．４１％和７４．０４％；与林龄约４０年的林分相比较，林龄约１００年的高山松林中，高山松生物量所占比例减小而黄背栎等树种的生物量增大。

Thebiomass of Pinus densata forests which locate in NorthwestYunnan Province China with 28°05′N and 99°4o′E,and an elevation 3340～3500mis studied with the dimension analysis method.The total biomass of 40-aged stand is294.306 t / hm￣2and that of 100-aged stand is 231;495 t / hm￣2.Of the total biomass,thefirst tree layers which are only composedof Pinus densata share 86.41 % and 74.04%,the second tree layers which are mainly composed of Quercus ponnosa, Rhododendron,and Lyonioa share 13.32% and 25. 67% ,and the shrub layers, herbaceous layer andIitter shares respictively 0.04% and 0.05 % ,0.0 1 % and 0.02% 10.22%. The tree layerbiomass allocates differently to organs,i,e,48.90% and 44. 24% to stem wood,9.10% and 7.76% to stem bark, 19.10% and l9.60% to branches,4.99% and 5.85% toneedles(leaves),8.01 % and 6.82%to root neck,and 9. 80%and 15.81 % to root svs-tem。The importance of Pinus densata to the total biomass of stands reduces and that ofQuercus ponnosa raises as the age of stands increases.