氮添加与干季延长对降香黄檀幼苗非结构性碳水化合物、养分与生物量的影响  

Effects of nitrogen addition and extended dry season on non-structural carbohydrates,nutrients and biomass of Dalbergia odorifera seedlings

作　　者：苏炜 陈平[2] 吴婷 刘岳 宋雨婷 刘旭军 刘菊秀[1] SU Wei;CHEN Ping;WU Ting;LIU Yue;SONG Yu-Ting;LIU Xu-Jun;and LIU Ju-Xiu(South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650,China;and 2Zhongkai University of Agriculture and Engineering,Guangzhou 510260,China)

机构地区：[1]中国科学院华南植物园,广州510650 [2]仲恺农业工程学院,广州510260

出　　处：《植物生态学报》2023年第8期1094-1104,共11页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金(41991285、32201367、32101342和41977287);广东省重点领域研发计划(2020B1111530004);广东省财政专项林业项目。

摘　　要：氮(N)添加和干季延长会对植物的非结构性碳水化合物(NSCs)含量、碳(C)、N、磷(P)浓度和生物量等产生深远影响,然而这种影响在同一植物不同器官(叶、枝、树干、根)间的差别尚不清晰。该研究以华南地区名贵树种降香黄檀(Dalbergia odorifera)幼苗为对象,探究降香黄檀幼苗不同器官的NSCs含量、养分含量、化学计量比以及生物量对N添加和干季延长的响应,比较不同环境下降香黄檀的生长状况与养分分配情况,为预测全球变化下降香黄檀的生长提供理论依据。结果显示:(1)N添加显著增加树干的NSCs含量,而N、水交互(N添加和干季延长交互处理)作用下树干的NSCs含量显著降低,N添加、干季延长及其交互作用显著增加根的可溶性糖含量;(2)N添加下根的N含量显著增加、C:N显著降低,N、水交互作用下降香黄檀树干C:P和N:P降低;(3)N添加、干季延长及其交互作用下降香黄檀总生物量无显著变化,但叶质比显著降低,并且N添加与干季延长下根冠比降低,茎叶比则显著增加。因此,未来干季延长背景下,N添加可能会促进降香黄檀幼苗树干的生长,有利于提高降香黄檀的经济价值,但需要在干季适量补水,防止降香黄檀受干旱胁迫导致生长受到抑制。Aims Nitrogen addition and extended dry season can profoundly affect non-structural carbohydrates(NSCs),carbon(C),nitrogen(N)and phosphorus(P)concentrations,and biomass of plants,however,the different responses of various organs(leaf,trunk,stem and root)in the same plants are not clear.We thus explored such responses to N addition and extended dry season to help better predict plant growth under global changes.Methods The investigation was conducted with Dalbergia odorifera seedlings through a manipulated N and water experiment.The concentrations of NSCs and C,N,and P and allocation pattern of biomass in different organs of D.odorifera seedling were determined,and then compared among different treatments.Important findings(1)N addition significantly increased trunk NSCs concentrations,while the interaction of N addition and extended dry season significantly decreased NSCs concentrations.N addition,extended dry season and their interaction significantly increased root soluble sugar concentrations.(2)N addition significantly increased root N concentrations and decreased C:N,and the interaction of N addition and extended dry season significantly decreased C:P and N:P in trunks.(3)All treatments did not influence the total biomass of D.odorifera,but significantly decreased the ratio of leaf biomass to total biomass,and N addition and extended dry season significantly decreased the ratio of root biomass to shoot biomass but increased the ratio of stem biomass to leaf biomass.Overall,N addition may promote the growth of seedling trunks and improve the economic value of D.odorifera under the extended dry season in the future.In order to prevent the growth of D.odorifera from being inhibited under drought stress,it is necessary to replenish an appropriate amount of water in the dry season.

关 键 词：氮添加 干季延长 非结构性碳水化合物 养分 生物量 降香黄檀 

分 类 号：S792.28[农业科学—林木遗传育种]