楊松林 的英文怎麼說
中文拼音 [yángsōnglīn]
楊松林
英文
yang songlin-
Forests sometimes contain many tree species within a small area ( as in tropical rain and temperate deciduous forests ), or relatively few species over large areas ( e. g., taiga and arid montane coniferous forests )
作為普遍規則，受被子植物支配的森林（闊葉林）比那些受裸子植物支配的森林（松樹或針葉林）物種豐富，雖然有例外存在（例如，種類匱乏的白楊和樺樹生長在北緯度地區） 。Through the stand investigation by setting up the sample site, the investigation results showed that the average dbh of 15 - year - old alniqhtllm fortunei planted under nature was 60 % larger than that of 17 - year - old pinus massoniana plantation under the same condition, the average tree height of the above was 38 % larger than that of the latter, the average single - tree volume of the above was 3. 2 times higher than that of the latter, the above showed the absolute dominance in stands
摘要設立標準地進行林分調查，在標準地中選取擬赤楊標準木進行樹干解析，採用生長對比方式分析擬赤楊在馬尾松人工林中的生長情況，調查結果表明，在同一環境條件下， 15年生天然下種的擬赤楊比17年生馬尾松人工林平均胸徑大60 % ，平均樹高高38 % ，平均單株材積大3 . 2倍，在林分中表現出絕對優勢。In this paper, three main tree species wood planted in our country, poplar, chinese fir and masson pine are chosen as the research materials. their wood surface identities, the forming process of the wood - plastics interface, and the relativity of the influence factors to the wood - plastics composite properties are studied
本文以我國人工林主要樹種楊樹、杉木和馬尾松木材為主要研究對象，從人工林木材的表面特性研究入手，探索木材與塑料復合界面的形成過程，研究木塑復合材料性能的主要影響因子。
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