氮添加对稀土尾砂地猴樟幼苗根系生长、生物量分配及非结构性碳水化合物的影响  

Effects of Nitrogen Addition on Root Growth,Biomass Allocation and Non-structural Carbohydrate Content of Cinnamomum bodinier Seedlings in Rare Earth Tailings

作　　者：陈志琪 张海娜 刘佳丽[1] 鲁向晖[1] 杨宝城 CHEN Zhiqi;ZHANG Haina;LIU Jiali;LU Xianghui;YANG Baocheng(Jiangxi Provincial Engineering Research Center of Seed-breeding and Utilization of Camphor Trees,Nanchang Institute of Technology,Nanchang 330099)

机构地区：[1]南昌工程学院江西省樟树繁育与开发利用工程研究中心,南昌330099

出　　处：《植物研究》2024年第1期86-95,共10页Bulletin of Botanical Research

基　　金：江西省教育厅科学技术研究项目(GJJ190946,GJJ190977);国家自然科学基金项目(52269013,32060333)。

摘　　要：为探究氮添加对稀土矿尾砂地猴樟(Cinnamomun bodinieri)幼苗生长及非结构性碳水化合物(NSC)含量的影响,以1年生猴樟扦插苗为研究对象,选用硝酸铵钙作为氮肥(含N 15%),设置3种氮肥水平(CK(0)、N1(1.8 g·株^(-1))、N2(3.6 g·株^(-1))),分析不同氮添加水平下猴樟幼苗根系生长、生物量分配和NSC等指标的差异,探讨稀土尾砂地猴樟对氮添加的响应。结果发现:稀土尾砂地氮添加均增加了猴樟幼苗不同组织的生物量积累,其中N1处理下叶生物量、冠层生物量分别较N2处理下显著提升了44.75%、57.43%(P<0.05);N2处理下叶比重分别较CK、N1处理显著提升了123.53%、15.85%(P<0.05)。不论是粗根(直径>2 mm),还是细根(直径≤2 mm),氮添加均显著增加了植物的根长和根表面积(P<0.05),其中N1处理的促进效果最显著(P<0.05);N2处理下的比根长、比表面积均高于CK与N1,且与CK显著差异(P<0.05)。对NSC来说,N1处理提升了叶、茎中的可溶性糖质量分数,而N2处理下细根NSC质量分数分别比CK、N1显著降低了46.49%、28.61%。综上,在稀土矿尾砂地植被恢复过程中,宜选用1.8 g·株^(-1)硝酸铵钙氮肥对猴樟幼苗进行施肥管理。In order to explore the effects of nitrogen addition on the growth and non-structural carbohydrate(NSC)content of Cinnamomum bodinieri seedlings in rare earth mine tailings,one-year-old C.bodinieri cuttings were used as materials,and calcium ammonium nitrate was used as nitrogen fertilizer(containing N 15%),and three nitrogen levels(CK(0),N1(1.8 g per plant),N2(3.6 g per plant))were set up to analyze the differences in root growth,biomass distribution and NSC of C.bodinieri seedlings under three nitrogen addition levels,and to explore the response of C.bodinieri in rare earth tailings to nitrogen addition.The results showed that:Nitrogen addition increased the biomass accumulation of different tissues of C.bodinieri seedlings in rare earth tailings,and the leaf biomass and canopy biomass at N1 level were significantly increased by 44.75%and 57.43%(P<0.05),respectively,compared with N2.Compared with CK and N1 treatment,the leaf mass ratio of N2 level was significantly increased by 123.53%and 15.85%(P<0.05),respectively.Nitrogen addition significantly promoted the root length and root surface area of both coarse roots(diameter>2mm)and fine roots(diameter≤2mm)(P<0.05),and the promotion effect of N1 treatment was the most significant(P<0.05).The specific root length and specific surface area under N2 treatment were higher than those of CK and N1,and significantly different from CK(P<0.05).For NSC,N1 treatment increased the soluble sugar mass fraction in leaves and stems,while the NSC mass fraction of fine roots under N2 treatment was significantly lower than that of CK and N1 by 46.49%and 28.61%,respectively.In summary,during vegetation restoration in rare earth mine tailings,1.8 g per plant calcium ammonium nitrate fertilizer might be suitable for fertilization management of C.bodinieri seedlings.

关 键 词：稀土尾砂 氮添加 猴樟 根系生长 生物量分配 非结构性碳水化合物 

分 类 号：Q948[生物学—植物学]