白枪杆幼苗氮、磷、钾含量及化学计量特征对遮阴的响应  

Responses of Nitrogen,Phosphorus and Potassium Contents and Stoichiometric Characteristics of Fraxinus malacophylla Seedlings to Shading

作　　者：韦兴兰 井卉竹 茶晓飞 郭焕仙 张梅 孙丽娟[1] 董琼[1] WEI Xinglan;JING Huizhu;CHA Xiaofei;GUO Huanxian;ZHANG Mei;SUN Lijuan;DONG Qiong(Key Laboratory of National Forestry and Grassland Administration on Biodiversity Conservation in Southwest China,Southwest Forestry University,Kunming 650224,China;Nujiang Forestry and Grassland Bureau,Nujiang 673199,China)

机构地区：[1]西南林业大学,西南地区生物多样性保育国家林业和草原局重点试验室,云南昆明650224 [2]云南省怒江州林业和草原局,云南怒江673199

出　　处：《云南农业大学学报（自然科学版）》2024年第2期130-136,共7页Journal of Yunnan Agricultural University:Natural Science

基　　金：国家自然科学基金项目(31260191);云南省教育厅科学研究基金项目(2021J0166)。

摘　　要：【目的】比较不同遮阴条件下白枪杆(Fraxinus malacophylla)幼苗氮(N)、磷(P)、钾(K)含量及化学计量特征对遮阴的响应规律,为白枪杆的林下种植提供科学管理依据。【方法】以1年生白枪杆盆栽苗为材料,设置4种遮阴处理(全光照、25%遮阴、50%遮阴和75%遮阴),持续观察3个月,然后测定白枪杆幼苗苗高与地径、各器官生物量、各器官N、P、K含量,并分析N、P、K化学计量特征等指标。【结果】50%遮阴处理下,叶N含量、茎和叶P含量、根和叶K含量最高;75%遮阴处理下,根和茎N含量最高,且白枪杆幼苗P利用效率最高。白枪杆幼苗叶片的N、P、K分配比例均在75%遮阴处理下达到最大值。随着遮阴程度的增加,白枪杆幼苗各器官内N、P、K积累量均呈先升高后降低的趋势,且均在50%遮阴处理下达到最大值。【结论】本研究条件下,全光照和过度遮阴均会显著影响白枪杆幼苗的生长,而在50%遮阴处理下可以促进白枪杆幼苗的生长及其各器官N、P、K和生物量的积累。可见,白枪杆幼苗具有一定的耐阴性,适宜在50%遮阴环境下生长。[Purpose]To compare the contents of nitrogen(N),phosphorus(P)and potassium(K)and stoichiometric characteristics of white lance pole(Fraxinus malacophylla)seedlings under different shade conditions in response to shading,providing a scientific management basis for understory planting of F.malacophylla seedlings.[Methods]One-year old F.malacophylla potted seedlings were used as materials,and four shading treatments(full light,25%shading,50%shading and 75%shading)were set up for three months,and then the height and diameter of F.malacophylla seedlings were measured,biomass of each organ,and N,P,and K contents of each organ were determined,and the stoichiometric characteristics of N,P,and K were analyzed.[Results]Under 50%shading treatment,N content in leaves,P content in stems and leaves,and K content in roots and leaves were highest;under 75%shading treatment,N content in roots and stems was highest,and P use efficiency was highest in F.malacophylla seedlings.The N,P,and K partitioning ratios in leaves of F.malacophylla seedlings all reached maximum values under the 75%shading treatment.With the increase of shading,N,P and K accumulation in all organs of F.malacophylla seedlings tended to increase and then decrease,and reaching a maximum value at 50%shading.[Conclusion]Under the conditions of this study,both full light and excessive shade affect the growth of F.malacophylla seedlings,while the growth of F.malacophylla seedlings and the accumulation of N,P,K and biomass in each organ of F.malacophylla seedlings can be promoted under 50%shading treatment.It can be seen that F.malacophylla seedlings have a certain degree of shading tolerance and are suitable for growth under 50%shading.

关 键 词：白枪杆幼苗 遮阴 化学计量特征 生物量 

分 类 号：S792.410.1[农业科学—林木遗传育种]