不同施氮量对白杄生长及碳代谢的影响  

Effects of Different Nitrogen Application on the Growth and Carbon Metabolism of Picea meyeri Rehd.et Wils.

作　　者：郭晓霄 GUO Xiao-xiao(Shanxi Provincial Forestry Ecological Experimental Base,Taiyuan,Shanxi 030031)

机构地区：[1]山西省林业生态实验基地,山西太原030031

出　　处：《陕西林业科技》2025年第1期19-24,共6页Shaanxi Forest Science and Technology

摘　　要：通过研究不同施氮量对白杄生长和碳代谢的影响规律,为其育苗中根据苗龄科学施用氮肥提供理论依据。试验在大田条件下,设置氮肥施用量分别为0 g·株^(-1)(CK),3 g·株^(-1),6 g·株^(-1)、9 g·株^(-1)、12 g·株^(-1)共计5个处理,3次重复。结果表明:9 g·株^(-1)处理与对照相比白杄株高和地径增长量分别提高了115.96%和125.00%,显著高于6 g·株^(-1)处理;叶绿素含量随着施氮量增加而升高的变化,9 g·株^(-1)和12 g·株^(-1)处理之间无显著差异;5月-8月,9 g·株^(-1)处理净光合速率分别较6 g·株^(-1)提高了70.04%、68.24%、40.30%和42.72%,5月和8月,3g·株^(-1)处理与对照之间无显著差异;9 g·株^(-1)施氮处理与对照相比显著提高了白杄酸性转化酶、蔗糖合成酶和蔗糖磷酸合成酶活性,12 g·株^(-1)与9 g·株^(-1)之间无显著差异;9 g·株^(-1)处理可溶性糖含量较6 g·株^(-1)分别提高了12.15%、15.56%、8.20%、7.43%,差异达到显著水平。综合分析认为,9 g·株^(-1)施氮量是3 a生白杄苗适宜的施氮量。By studying the effects of different nitrogen application rates on the growth and carbon metabolism of Picea meyeri,this research provides a theoretical basis for the scientific application of nitrogen fertilizer based on seedling age during its cultivation.The experiment was conducted under field conditions with five nitrogen fertilizer application rates:0 g·plant^(-1)(CK),3 g·plant^(-1),6 g·plant^(-1),9 g·plant^(-1),and 12 g·plant^(-1),each with three repetitions.The results showed that compared with the control,the plant height and ground diameter growth of Picea meyeri increased by 115.96%and 125.00%respectively under the 9 g·plant^(-1)treatment,which was significantly higher than the 6 g·plant^(-1)treatment.Chlorophyll content increased with nitrogen application,with no significant difference between the 9 g·plant^(-1)and 12 g·plant^(-1)treatments.From May to August,the net photosynthetic rate under the 9 g·plant^(-1)treatment was 70.04%,68.24%,40.30%,and 42.72%higher than that under the 6 g·plant^(-1)treatment,respectively.There was no significant difference between the 3 g·plant^(-1)treatment and the control in May and August.Compared with the control,the 9 g·plant^(-1)nitrogen treatment significantly increased the activities of acid invertase,sucrose synthase,and sucrose phosphate synthase in Picea meyeri.There was no significant difference between the 12 g·plant^(-1)and 9 g·plant^(-1)treatments.The soluble sugar content under the 9 g·plant^(-1)treatment was 12.15%,15.56%,8.20%,and 7.43%higher than that under the 6 g·plant^(-1)treatment,respectively,with significant differences.Based on comprehensive analysis,it is concluded that a nitrogen application rate of 9 g·plant^(-1)is suitable for three-year-old Picea meyeri seedlings.

关 键 词：氮肥 白杄 叶绿素 光合速率 株高 碳代谢 

分 类 号：S725.5[农业科学—林木遗传育种]