chinese fir seed造句

• In order to push the development of planting chinese fir by utilizing fine variety , research progresses on techniques of establishing chinese fir seed orchard , improving output and quality of seed orchard and the like were commented systematicaly , and some measures for future research were put forward
  笔者对杉木种子园建园技术、提高种子园产量和品质技术等方面的研究状况作了较为系统的综述，并对未来发展提出了建议。
• The self - poisoning effects of chinese fir plantation are studied through the seed germination experiment with the extracts of organs , bulk soils and rhizosphere soil of different rotation plantations . the results are as follows : there are some poisonous substances inhibiting germination of chinese fir seeds in soils of chinese fir plantations . the inhibiting effect becomes stronger and stronger with increase of planting generations . extracts from the organs of chinese fir trees also have some inhibiting effects on seed ' s germination , but the effect of leaf is the strongest . lower concentration extracts of underground vegetation may be favorable to the seed ' s germination whereas the higher concentration will reverse the results . it indicates that the “ self - poisoning ” effects of chinese fir plantations might be one of the reasons for poor natural regeneration and soil degradation of chinese fir plantation
  利用不同栽植代数杉木人工林根际土、非根际土及杉木各器官浸提液进行杉木种子发芽试验，研究杉木人工林自毒作用，研究结果表明：杉木林根际土及非根际土中均存在抑制杉木种子萌发的物质，随栽植代数增加抑制作用更趋明显；杉木各器官浸提液对杉木种子萌发也有抑制作用，其中以杉木叶的抑制作用最为明显，杉木林下常见植物对杉木种子发芽则表现为低促高抑效应，说明杉木人工林存在自毒作用，这可能是杉木连栽障碍的原因之一。