滇中高原华山松人工林生物量及营养元素分配格局

对云南玉溪磨盘山华山松人工林（16年中龄林、26年近成熟林、43年成熟林）生物量及N、 P、 K、 Ca和Mg等5种营养元素的分配格局和积累规律进行了研究。结果显示，3种林龄华山松人工林的生物量分别为181.515 t/hm2、284.679 t/hm2、295.311 t/hm2，乔木层生物量分别占林分的91.594％、94.760％、93.838％，乔木层的净生产力分别为10.391 t/（ hm2· a）、10.375 t/（ hm2· a）和6.444 t/（ hm2· a）；3种林龄群落各层生物量均为乔木层＞枯落物层＞灌木层＞草本层；乔木各营养器官营养元素含量大小是树叶＞树枝＞树根＞树皮（或树皮＞树根）＞树干；3种林龄华山松各器官营养元素含量均以N含量最高，其他元素含量依次为K＞Mg＞Ca＞P，其中树叶中的N含量最高，达到16.733 g/kg～21.368 g/kg；3种林龄群落营养物质总积累量分别为1497.993 kg/hm2、2257.161 kg/hm2和2810.246 kg/hm2，乔木层营养物质年积累量分别为77.532 kg/（ hm2· a ）、76.679 kg/（ hm2· a）、58.759 kg/（ hm2· a）。

Nutrient Distribution and Accumulation of Pinus armandii Plantations in Middle Yunnan Plateau,China

Biomass, nutrient （e.g.N, P, K, Ca and Mg） distribution pattern and accumulation of the 16 a, 26 a, and 43 a Pinus armandii plantations were studied in Mopanshan in Yuxi , middle Yunnan plateau, southwest China.The results showed that： the biomass of the three types of Pinus armandii plantations were 181.515 t/hm2 , 284.679 t/hm2 , and 295.311 t/hm2 respectively; the biomass of tree layer accounted for 91.594%, 94.760%, 93.838%respective-ly.The net biomass of tree layer were 10.391 t/（hm2· a）, 10.375 t/（hm2· a） and 6.444 t/（hm2· a）; bio-mass of different ages followed the order of tree layer 〉litter layer〉shrub layer〉herb layer; Pinus armandii’s nutrient content sorted by organ was in the order of leaf 〉branch〉root （ or bark〉root） 〉bark〉trunk.They were all the rich in N and in the order of N 〉K〉Mg〉Ca〉P; the content N in leaves was the highest and was between 16.733 g/kg~21.368 g/kg; the accumulation of nutrients of three types of Pinus armandii plantations were 1 497.993 kg/hm2 , 2 257.161 kg/hm2 and 2 810.246 kg/hm2 respectively; the annual accumulation of nutri-ents of tree layer were 77.532 kg/（hm2· a）, 76.679 kg/（hm2· a）, 58.759 kg/（hm2· a） respectively.