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研究报告目录 |
鼎湖山马尾松群落能量分配及其生产的动态 |
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| 出 版 社：广西植物 |
| 发表时间：2005 |
| 台 站：
鼎湖山森林生态系统定位研究站
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| 作 者：方运霆 莫江明 李德军 曹裕松 |
| 点 击 率：5525 |
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| 关 键 字：热值 能量现存量 能量生产量 马尾松 鼎湖山 |
| 摘 要：对鼎湖山马尾松群落各组分热值、能量现存量、能量净生产量及群落太阳能转化效率进行了研究。结果表明:(1)乔木层马尾松各器官热值相差不大,为19.02~20.30 kJ/g(总平均19.34 kJ/g);灌木层植物热值低于乔木层,为16.55~18.78 kJ/g(总平均17.82 kJ/g);草本层植物热值低于灌木层,为13.07~16.16 kJ/g(总平均15.03 kJ/g)。(2)群落能量总现存量随时间而增加,且组分分配比例因年份不同而异。在1990、1995和2000年分别为167 141.4、270 295.9和321 294.3 kJ/m2,其中乔木层占93.4%、79.8%和86.7%,林下层占3.5%、10.6%和7.2%,而地表现存凋落物层仅占3.2%、9.5%和6.1%。(3)群落在1990~1995年和1995~2000年期间能量净生产每年分别为1 7083. 2 kJ/m2 和21 571. 8 kJ/m2,其中乔木层占96. 6%和95 5%,林下层仅占3.4%和5.0%。所有能量生产量中,群落自身增长能量(即年能量存留量)占72.7%和57.6%,而释放到其它子系统的能量占27.3%和42.4%。(4)群落太阳能转化效率在1990~1995 年和1995~2001年分别为0.759%和0.958%,10年平均为0.873% |
| 关 键 字(英文)：gross caloric value standing crop of energy energy production Pinus massoniana Dinghushan |
| 摘 要(英文)：Dynamics of energy dist ribution and it s production of a Pinus massoniana community in Dinghushan Biosphere Reserve were studied over a ten year period f rom 1990 to 2000. Gross caloric value was estimated to be 19. 34 kJ / g for t ree (range 19. 02～20. 30 kJ / g) ,17. 82 kJ / g for shrub (16. 55～18. 78 kJ / g) ,and 15. 03 for
herb (range 13. 07～16. 16 kJ / g) . The standing crop of energy was 167 141. 4 kJ / m2 (1990) ,270 295. 9 kJ / m2
(1995) and 321 294. 3 kJ / m2 (2000) ,with t ree accounting for 93.4 % ,79. 8 % and 86. 7 % , respectively. Netenergy production was 17 083. 2 kJ / m2 . a for the period f rom 1990～1995 and 21 571. 8 kJ / m2 . a for the periodf rom 1995～2000 ,of which 96. 6 % and 95. 5 % was cont ributed by t ree ,the rest by under story plant . Of totalnet energy production ,72. 7 %(during1990～1995) and 57. 6 %(during 1995～2000) was accumulated as bio-mass energy ,and 27. 3 %(during 1990～1995) and 42. 4 %(during 1995～2000) was returned to soil by litter-fall . Relative to the photosynthetic active radiation on the stand ,the energy conver sing efficiency of P. masso-niana community was 0. 759 %for the period of 1990～1995 , 0. 958% for the period of 1995～2000 ,with a to-tal mean of 01873% for the period of 1990～2000. The current management for pine forest in Dinghushan Bio-sphere Reserve was al so discussed based on the result s of this study. |
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