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

生态学杂志

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

韩潇潇^1,2，林力涛^1,2,3，于占源^1*，刚群⁴，黄月¹，林贵刚¹，曾德慧¹

(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)

出版日期:2020-07-10 发布日期:2021-01-09

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

HAN Xiao-xiao^1,2, LIN Li-tao^1,2,3, YU Zhan-yuan^1*, GANG Qun⁴, HUANG Yue¹, LIN Gui-gang¹, ZENG De-hui¹

(¹Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; ²University of Chinese Academy of Sciences, Beijing 100049, China; ³State Key Laboratory of Urban and Regional Ecology, Research Center for EcoEnvironmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; ⁴Shenyang Agricultural University, Shenyang 110161, China).

Online:2020-07-10 Published:2021-01-09

摘要/Abstract

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。

关键词: 产量, 氮肥, 品质, 水稻, 氮肥利用效率

Abstract: 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 in 2019). 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 2nd 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 contents 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.

Key words: nitrogen use efficiency, rice, nitrogen fertilizer, yield, quality.

韩潇潇，林力涛，于占源，刚群，黄月，林贵刚，曾德慧. 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[J]. 生态学杂志.

HAN Xiao-xiao, LIN Li-tao, YU Zhan-yuan, GANG Qun, HUANG Yue, LIN Gui-gang, ZENG De-hui. Responses of foliar element contents and stoichiometry of dominant plant species to the cessation of N and P fertilization.[J]. cje.

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