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杉木１９个不同家系苗木施氮试验结果表明：在不追加氮的自然生长状况下，三明５４、三明５６、三明５８三个家系生物量最大，表现最优；杉木苗期施氮对生物量影响显著；不同家系对氮素要求不同，有些家系对氮素要求高，宜多施氮肥，有些家系对氮素要求低，不宜多施氮肥；杉木苗木的生物量与叶绿素含量、净光合速率呈正相关，生长良好的家系叶绿素含量、净光合速率较高；苗期施氮能提高叶绿素含量，其叶绿素反应趋势与生物量反应趋势一致，说明苗木的生理活动是苗木生长状况的决定因素。
The results of nitrogen application in seedlings of 19 different Chinese fir families showed that the biomass of Sanming 54, Sanming 56 and Sanming 58 was the highest and the best performance under the condition of no additional nitrogen. The effect of N application on biomass Significant; different families of different nitrogen requirements, some families of high nitrogen requirements, should be more nitrogen, some families of low nitrogen requirements, should not be more nitrogen fertilizer; fir seedling biomass and chlorophyll content, net photosynthetic rate was positively correlated , The chlorophyll content and net photosynthetic rate of families with good growth were higher. The nitrogen application at seedling stage could increase the content of chlorophyll, and the trend of chlorophyll reaction was in accordance with the trend of biomass response, indicating that the physiological activity of seedling is the determinant of seedling growth.