摘要
植物功能性状能够反映植物个体对环境的响应和适应.为探究氮沉降对亚热带优势乔木树种功能性状的影响并寻求缓解过量氮沉降影响的措施,选择马尾松(Pinus massoniana)和木荷(Schima superba)幼苗为研究对象,设置了6个实验处理对照、加氮(20 g m^(-2)a^(-1))、加碳酸钙(100 g m^(-2)a^(-1))、加氮和加碳酸钙、加磷(10 g m^(-2)a^(-1))、加氮和加磷.结果显示:(1)氮添加显著增加木荷的根茎叶生物量,分别增加了319.83%、67.79%和66.14%;但对马尾松生物量的影响不显著.(2)氮添加显著增加木荷的总叶面积(增加了96.13%),但显著降低木荷的根系分叉数(降低了34.26%);马尾松叶片和根系功能性状对氮添加的响应不显著.(3)高氮添加背景下,碳酸钙添加显著降低了木荷的根叶生物量、总叶面积和比根长,分别降低了63.39%、30.56%、44.67%和80.81%;也显著降低了马尾松的比根长、比根面积和根分叉数,分别降低了54.11%、43.12%和59.39%;但对马尾松生物量无显著影响.(4)同时添加氮磷显著增加了木荷的根茎叶生物量,分别增加了96.41%、14.30%和34.65%;但对马尾松的生物量及根系功能性状无显著影响.本研究表明木荷对氮沉降的敏感程度较马尾松高,氮沉降可能通过改变物种的叶片和根系功能性状影响木荷的生长;高氮沉降背景下,碳酸钙添加可能抑制木荷和马尾松幼苗的生长,但磷添加可进一步促进木荷的生长.(图3表2参37)
Plant functional traits can reflect the response and adaptation of individual plants to the environment.This study aimed to investigate the effect of N deposition on the functional traits of the dominant tree species in a subtropical zone as well as ways to mitigate the effects of N deposition.In this study,Pinus massoniana and Schima superba were selected as research objects,and six experimental treatments were set up:control,N addition(20 g m-2 a-1),liming(CaCO3100 g m-2 a-1),phosphorus addition(P,10 g m-2 a-1),N and lime addition,and N and P addition.The results showed that(1)N deposition significantly increased the root,stem,and leaf biomass of S.superba by 319.83%,67.79%,and 66.14%,respectively,but did not affect the biomass of P.massoniana.(2)N deposition significantly increased the total leaf area of S.superba by 96.13%but significantly decreased the number of root forks of S.superba by 34.26%.The functional traits of the leaves and roots of P.massoniana did not respond to N deposition.(3)Under conditions of high N deposition,liming significantly reduced root,stem,and leaf biomass,leaf number,total leaf area,and the specific root length of S.superba by 63.39%,30.56%,35.87%,44.67%,and 80.81%,respectively,and also significantly decreased the specific root length,specific root area,and the number of root forks of P.massoniana by 54.11%,43.12%,and 59.39%,respectively,but did not affect the biomass of P.massoniana.(4)The addition of N and P significantly increased the root,stem,and leaf biomass of S.superba by 96.41%,14.30%,and 34.65%,respectively,but there was no significant effect on the biomass and functional traits of P.massoniana.According to these results,we can conclude that the sensitivity of S.superba to N deposition was higher than that of P.massoniana.In addition,N deposition may affect the growth of S.superba by changing the functional traits of the leaves and roots.With an increase in nitrogen deposition,liming may inhibit the growth of S.superba and P.massoniana,while P addition may enhance the gr
作者
江佳
盛笑羚
邵炯妮
林颖
何沁如
韩文娟
JIANG Jia;SHENG Xiaoling;SHAO Jiongni;LIN Ying;HE Qinru;HAN Wenjuan(College of Chemistry and Life Sciences,Zhejiang Normal University,Jinhua 321000,China;College of Life and Environmental Science,Wenzhou University,Wenzhou 325035,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2020年第2期410-416,共7页
Chinese Journal of Applied and Environmental Biology
基金
浙江省自然科学基金(LQ18C030001)
国家自然科学基金(31901213)资助。
关键词
氮添加
磷添加
碳酸钙添加
叶片功能性状
根系功能性状
nitrogen addition
phosphorus addition
liming addition
leaf functional trait
root functional trait
