天然下种 meaning in English
natural seeding
wild seeding
Examples
- The more the water shortage , the thicker the dried layer
( 4 )严重土壤干层使天然下种更新不良。 - 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
摘要设立标准地进行林分调查，在标准地中选取拟赤杨标准木进行树干解析，采用生长对比方式分析拟赤杨在马尾松人工林中的生长情况，调查结果表明，在同一环境条件下， 15年生天然下种的拟赤杨比17年生马尾松人工林平均胸径大60 % ，平均树高高38 % ，平均单株材积大3 . 2倍，在林分中表现出绝对优势。