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.
鼎湖山马尾松群落能量分配及其生产的动态