摘要
参考沿海防护林高盐低磷的实际情况,设置0(N0)、2(N1)、4(N2)、6(N3)和8(N4)g·kg^(-1)NaCl 5个单一处理组以及N2-P1(0.5 g·kg^(-1)Ca(H_(2)PO_(4))_(2))、N_(2)-P_(2)(1.5 g·kg^(-1)Ca(H_(2)PO_(4))_(2))、N3-P1、N3-P2、N4-P1和N4-P26个复合处理组,研究不同浓度NaCl单一胁迫及NaCl胁迫下施磷对台湾相思(Acacia confusa Merr.)幼苗干物质积累、根形态及营养元素含量的影响。结果显示:总体上看,NaCl单一胁迫及低浓度(4 g·kg^(-1))NaCl胁迫下施磷均会明显减少台湾相思幼苗根干质量、总干质量、总根长、总根表面积和总根体积;中浓度(6 g·kg^(-1))NaCl胁迫下施磷对幼苗干物质积累和根形态的改善效果不显著,但施1.5 g·kg^(-1)Ca(H 2 PO 4)2后幼苗根干质量和总干质量高于NaCl单一胁迫。从不同级别根直径(D)看,低径级(0.0 mm<D≤0.5 mm)的根对NaCl单一胁迫较为敏感,且在低浓度NaCl胁迫下施磷后受抑制更加明显;而高径级(D>5.0 mm)的根对NaCl单一胁迫有一定抗性,中浓度NaCl胁迫下施磷后的总根长、总根表面积和总根体积明显高于NaCl单一胁迫。与对照(0 g·kg^(-1)NaCl,0.0 g·kg^(-1)Ca(H_(2)PO_(4))_(2))相比,NaCl单一胁迫及NaCl胁迫下施磷会使根中Na含量明显增加,其他7种元素含量总体下降。高浓度(8 g·kg^(-1))NaCl胁迫导致幼苗死亡,而施磷后幼苗对NaCl胁迫有一定的抵抗作用,其中以施0.5 g·kg^(-1)Ca(H_(2)PO_(4))_(2)的效果较好。相关性分析结果显示:NaCl单一胁迫下台湾相思幼苗根中P含量与总根长、根尖数、根分枝数和根组织密度呈显著或极显著正相关,与平均根直径呈显著负相关;NaCl胁迫下施磷后幼苗根中Mn和K含量与根干质量、总干质量、总根长、总根表面积和总根体积均呈显著或极显著正相关。综上所述,在沿海种植台湾相思幼苗时,建议低盐土壤不施磷,中高盐土壤可根据具体土壤盐胁迫程度添加磷,同时适量添加Mn和K。
Considering the actual situation of high salt and low phosphorus of coast protection forest,five single treatment groups namely 0(N0),2(N1),4(N2),6(N3),and 8(N4)g·kg^(-1)NaCl and six combined treatment groups namely N2-P1(0.5 g·kg^(-1)Ca(H 2 PO 4)2),N2-P2(1.5 g·kg^(-1)Ca(H_(2)PO_(4))2),N3-P1,N3-P2,N4-P1,and N4-P2 were set in this study,effects of NaCl single stress at different concentrations and phosphorus application under NaCl stress on dry matter accumulation,root morphology,and nutrient element contents of Acacia confusa Merr.were studied.The results show that on the whole,NaCl single stress and phosphorus application under low concentration(4 g·kg^(-1))NaCl stress will evidently decrease root dry mass,total dry mass,total root length,total root surface area,and total root volume of A.confusa seedlings;the improved effect of phosphorus application under medium concentration(6 g·kg^(-1))NaCl stress on dry matter accumulation and root morphology of seedlings is not significant,but the root dry mass and total dry mass of seedlings after applying 1.5 g·kg^(-1)Ca(H_(2)PO_(4))_(2)are higher than those under NaCl single stress.From the different levels of root diameter(D),roots in low diameter class(0.0 mm<D≤0.5 mm)are relatively sensitive to NaCl single stress,and are more evidently suppressed after phosphorus application under low concentration NaCl stress;while roots in high diameter class(D>5.0 m)possess some resistance to NaCl single stress,total root length,total root surface area,and total root volume after phosphorus application under medium concentration NaCl stress are obviously higher than those under NaCl single stress.Compared with the control(0 g·kg^(-1)NaCl,0.0 g·kg^(-1)Ca(H_(2)PO_(4))_(2)),NaCl single stress and phosphorus application under NaCl stress will evidently increase Na content in roots,while contents of the other seven elements decrease in general.High concentration(8 g·kg^(-1))NaCl stress causes seedling death,while seedlings are partially tolerant to NaCl stress after phosphor
作者
罗倩
陈灿
袁锋
江传阳
高倩倩
谢安强
林勇明
吴承祯
LUO Qian;CHEN Can;YUAN Feng;JIANG Chuanyang;GAO Qianqian;XIE Anqiang;LIN Yongming;WU Chengzhen(Collegiate Key Lab of Forest-Ecosystem Process and Management in Fujian,College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Diantou State-owned Protective Forest Farm of Jinjiang in Fujian,Quanzhou 362200,China;Department of Ecology and Engineering,Wuyi University,Nanping 354300,China)
出处
《植物资源与环境学报》
CAS
CSCD
北大核心
2023年第5期78-88,共11页
Journal of Plant Resources and Environment
基金
福建省林业科技项目(2021FKJ22)
福州市科技项目(2021-P-034)
福建农林大学优秀研究生学位论文资助基金项目(1122YS01010)。
关键词
台湾相思
NACL胁迫
施磷
干物质积累
根形态
营养元素
Acacia confusa Merr.
NaCl stress
phosphorus application
dry mass accumulation
root morphology
nutrient element
