摘要
本文对浙江省北部平原水杉人工林的生物量和生产力进行了测定和研究。按平均标准木法分别调查了干、枝、叶、根的生物量。据调查材料,用相对生长规律建立了估测单株林木各器官干重的回归方程,方程的相关系数和估测精度符合要求,具实用价值。研究结果表明:水杉人工林生物量随年龄的增长而增加,林带18年生后增加速度变缓,片林生物量普遍大于林带生物量,生物量组成比例因年龄而异。随着年龄的增加,年平均净生产量、叶面积指数、光能利用率均逐步加大,至18年生时,上述指标分别为17.51t/ha·a、9.1和0.77％。叶净光合生产率以速生阶段为最大,衰退阶段为最低,当叶净光合生产率急剧下降时,可实施主伐更新。
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.
关键词
水杉
生物量
生产力
能量
Metasequoia glyptostrodoides
Biomass
Productivity
Energy
