A STUDY ON THE BIOMASS OF METASEQUOIA GLYPTOSTROBOIDES PLANTATION IN ZHEBEI PLAIN
浙北平原水杉人工林生物量的研究

A preliminary research on the biomass and production of Metasequoia glyptostroboides in north plain of Zhejiang Province is presented here. The biomass of M. glyptostroboides was observed by "average standard tree" method.The following regression equations were derived from the standing crop of the destructive trees:lgWs=-1.3693 0.84281g (D~2H), lnWb=-0.2238 0.1434D, lnW1=-0.7865 0.1137D, lgWa=-1.0967 0.8026 (D~2H), lgWr=-1.4455 2.0887lgD, lgWt=-0.8168 2.1549lgD.The results obtained show that the biomass increased with tiine, and the increasing rate slowed down after 18 years-old. The biomass in stand was larger than in shelterbelt. The constitution ratios varied with time The net productio,leaf area index(LAI), and the utilization rate of solar energy oncreased with time, with 17.51t/ha. a, 9.1 and 0.77% as typical values respectively in age of 18 years. The net photosynthetic rate of leaf (NPR) was maximum in the fast growing period and was least in the declining period. When NPR decreased fast, the stand was cut over and regenerated.