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首页> 外文期刊>Silva Fennica >Biomass production of Betula pendula stands regenerated in the region of allochthonous Picea abies dieback.
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Biomass production of Betula pendula stands regenerated in the region of allochthonous Picea abies dieback.

机译：西南桦（Picea abies dieback）区域再生了西南桦（Betula pendula）的生物量。

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The paper deals with production of above-ground biomass of silver birch (emBetula pendula/em Roth) stands in the Czech Republic. One-year biomass dynamics was studied within chronosequence of birch stands at the age of 4–5, 8–9, 17–18 and 22–23 years. With the exception of the youngest stand, which was established by seeding, all experimental birch stands were regenerated naturally after the allochthonous spruce stands. Above-ground biomass (AB) was calculated from plot inventory data and biomass equations were parameterized from destructive sampling of biomass component of sampled trees. Results reveal that the peak of the mean annual increment (MAIsubABtotal/sub) of birch stands can be expected at the age from 15 to 20 years. Additionally, the stand age, the value of basal area (BA) should be considered as a predictor of stand productivity. If the value of BA varied from 25 to 35 msup2/sup hasup–1/sup, the MAI of the birch stands reached the range from 5.0 to 6.5 t of dry biomass per ha ysup–1/sup at the age ranging between 15 and 25 years. The stem/branch proportion increased with stand age, the stem relative proportion ranging from 75 to 90% of total above-ground biomass. According to the results of this study, birch stand biomass production and utilization is one of the approaches in terms of forest recovery management in large disturbed areas. Although, no silvicultural treatments were occurred in all analysed stands, the pre-commercial thinning method could increase stand productivity and stability as well.
机译：该论文涉及捷克共和国桦木（Betula pendula Roth）林分的地上生物量的生产。在4-5岁，8-9岁，17-18岁和22-23岁的白桦林时间序列内研究了一年生物量动态。除了通过播种建立的最年轻的林分，所有实验性桦木林分都在异源云杉林后自然再生。从地块清单数据计算地上生物量（AB），并从破坏性取样中采样树木的生物量成分对生物量方程进行参数化。结果表明，桦木林分的年均增幅（MAI ABtotal ）的峰值可望出现在15至20岁之间。此外，林分年龄，基础面积（BA）值应视为林分生产力的预测指标。如果BA的值从25到35 m 2 ha -1 变化，则桦木林的MAI达到每公顷干生物量5.0至6.5吨 –1 ，年龄在15至25岁之间。茎/枝的比例随林龄的增加而增加，茎的相对比例为地上总生物量的75％至90％。根据这项研究的结果，桦木林分生物量的生产和利用是大动荡地区森林恢复管理的方法之一。尽管在所有分析的林分中均未进行营林处理，但商业化前的稀疏方法也可以提高林分的生产率和稳定性。

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