Based on the data collected from a standard permanent plot of Pinus yunnanensis var.tenuifolia natural forest in Guangxi Yachang Forest Farm , the amount and distribution of biomass was studied by investigating and sample tree harvesting method , and the results showed that: 1) The total vegetation biomass of Pinus yunnanensis var.tenuifolia forest was 140.06 t/hm2 .2) The distribution law of biomass in each layer were arbor layer 127.75 t/hm2 (91.21 %), of which overstory trees contributed the large proportion (88.54%) and amounted to 124.01 t/hm2 , shrub layer 5.21 t/hm2 (3.72%), herb layer 2.56 t/hm2 (1.83%), litter 1ayer 4.54 t/hm2 (3.24%). 3) In the overstory layer , the biomass was allocated as 57.61 t/hm2 (46.46%) for trunk, 9.97 t/hm2 (8.04%) for bark, 23.25 t/hm2 (18.75 %) for branch, 9.26 t/hm2 (7.47 %) for leaf, and 23.92 t/hm2 (19.18 %) for root .%采用样地调查及标准木法，对广西国有雅长林场细叶云南松天然林中林（23年）乔木层、灌木层、草本层、凋落物层的生物量进行研究，结果表明，（1）23年生细叶云南松天然林生态系统总生物量为140.06 t/hm2。（2）各层次的生物量分布为，乔木层127.75 t/hm2，占总生物量91.21％，其中细叶云南松生物量124.01 t/hm2，占总生物量88.54％；灌木层5.21 t/hm2，占3.72％；草本层2.56 t/hm2，占1.83％；枯枝落叶层4.54 t/hm2，占3.24％。（3）乔木层生物量在各器官的分布为，干材生物量57.61 t/hm2（46.46％），皮9.97 t/hm2（8.04％），枝23.25 t/hm2（18.75％），叶9.26 t/hm2（7.47％），根23.92 t/hm2（19.18％）。
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