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采用１９个杉木不同家系的苗木进行氮素营养要求试验，１年生苗木盆栽试验结果表明：杉木不同家系对氮素营养的要求差异较大；有些家系生长好，对氮素要求也高，２ｇ氮处理可使家系三明５４苗高、地径生长增益分别达３９．８％、４１．７％，三明５６苗高、地径生长增益分别达４５．５％、３９．７％；有些家系生长不良，对氮素营养的要求高，２ｇ氮处理可使家系三明４２苗高、地径生长增益分别达３１６．２％、１０３．６％，Ａ１苗高、地径生长增益分别达１３２．５％、１３８．０％；有些家系生长不良，对氮素营养的要求不高。
Nitrogen nutrition requirements of 19 Chinese fir seedlings were tested. The results of 1-year-old seedlings potted showed that different families of Chinese fir had different requirements on nitrogen nutrition. Some families grew well and their nitrogen requirements were also high. 2 g nitrogen The treatment could make the seedling height and diameter growth gain of family Sanming 54 reach 39.8% and 41.7% respectively, and the growth gain of Sanming 56 reached 45.5% and 39.7%, respectively. Some families had poor growth , High requirement for nitrogen nutrition, 2g nitrogen treatment could make the plant height and diameter growth gain of family Sanming 42 reach 316.2%, 103.6%, A1 seedling height, diameter growth gain respectively 132.5% , 138.0%; some families poor growth, the requirements of nitrogen nutrition is not high.