N、P停止施入后植物叶片主要元素含量及化学计量特征的响应  

Responses of foliar element contents and stoichiometry of dominant plant species to the cessation of N and P fertilization

作　　者：韩潇潇 林力涛 于占源[1] 刚群 黄月[1] 林贵刚[1] 曾德慧[1] HAN Xiao-xiao;LIN Li-tao;YU Zhan-yuan;GANG Qun;HUANG Yue;LIN Gui-gang;ZENG De-hui(Daqinggou Ecological Station,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China;University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;Shenyang Agricultural University,Shenyang 110161,China)

机构地区：[1]中国科学院沈阳应用生态研究所大青沟沙地生态实验站,沈阳110016 [2]中国科学院大学,北京100049 [3]城市与区域生态国家重点实验室,北京100085 [4]沈阳农业大学,沈阳110161

出　　处：《生态学杂志》2020年第7期2167-2174,共8页Chinese Journal of Ecology

基　　金：“美丽中国”生态文明科技工程专项(XDA23080402);国家自然科学基金项目(30800143)资助。

摘　　要：研究植物叶片C、N、P化学计量特征,有助于深入了解植物对环境的适应策略。为探明不同植物叶片主要元素含量及化学计量对N、P停止施入后的响应,依托野外长期实验,测定科尔沁沙质草地优势种绿珠藜(Chenopodium glaucum,2010年采集)、芦苇(Phragmites australis,2010年和2019年均采集)、野大麻(Cannabis sativa,2019年采集)成熟叶片的C、N、P含量。结果表明:停止施肥后,3个优势种(绿珠藜、芦苇、野大麻)的叶片C含量在各处理间差异不显著;N停止施入2年后(2010),绿珠藜叶片N含量有显著差异(P=0.001);P停止施入的第2年,绿珠藜(P<0.001)和芦苇(P=0.029)叶片的P含量在各处理间差异显著;N、P停止输入11年后,芦苇和野大麻的N含量在各处理间差异不显著,芦苇叶片P含量在P处理仍有差异,野大麻叶片P含量无差异;N、P停止施入2年后,绿珠藜和芦苇的N∶P分别为5.33~12.63和19.78~24.63,N、P停止施入11年后,野大麻和芦苇的N∶P为4.96~5.67、15.86~20.38;N+P处理促进了植物叶片对N、P的吸收,N、P的添加对植物叶片N、P含量的影响是可逆和短期的。该结果可为科尔沁草地生态系统恢复的施肥管理提供科学基础。Uncovering plant C,N,and P stoichiometric characteristics contributes to better understanding of plant adaptation strategies.To clarify the responses of the contents and stoichiometry of main elements in dominant plant species to the cessation of N and P fertilization,a long-term field experiment was carried out to measure C,N,P contents in mature leaves of three main dominant species in a Horqin sandy grassland,including Chenopodium glaucum(collected in 2010),Phragmites australis(collected in 2010 and 2019),and Cannabis sativa(collected in2019).The results showed that after the cessation of fertilization,foliar C content of the three dominant species did not differ significantly among the treatments.Two years after the cessation of N application(2010),foliar N content in Chenopodium glaucum significantly differed among the treatments(P=0.001).In the 2 nd year after the cessation of P application,foliar P contents of Chenopodium glaucum and Phragmites australis were significantly differed among the treatments(P=0.000;P=0.029).Eleven years after the cessation of N and P fertilization,foliar N con-tents of Chenopodium glaucum,Phragmites australis did not differ significantly among the treatments.Foliar P content of Phragmites australis remained different in the P-added plots while no difference in foliar P content of Cannabis sativa was observed.Foliar N∶P ratio was 5.33-12.63 and 19.78-24.63 for Chenopodium glaucum and Phragmites australis after two years of N and P cessation,respectively,and was 4.96-5.67 and 15.86-20.38 for Phragmites australis and Cannabis sativa after 11 years of fertilization cessation,respectively.The combined N and P fertilization promoted plant N and P absorption,with reversible and short-term legacy effects of N and P addition on the foliar N and P contents of dominant species.Our results provide scientific basis for fertilization management in the restoration of Horqin grassland ecosystems.

关 键 词：生态化学计量 科尔沁沙地 沙质草地 养分利用策略 优势种 

分 类 号：Q948[生物学—植物学]