缙云山4种植物幼苗氮磷含量及生态化学计量特征对模拟酸雨的响应

doi:10.16843/j.sswc.2022219

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摘要为研究酸雨对植物幼苗氮(N)、磷(P)含量及生态化学计量特征,探讨植物养分及其化学计量之间的关系及对酸雨的响应。以1年生杉木、马尾松、香樟和毛竹幼苗为研究对象,于2021年5月在重庆缙云山,设置pH值7.0(对照)、4.5、3.5和2.5共4个处理,分别记为CK、pH4.5、pH3.5和pH2.5,进行为期4个月的原位模拟酸雨喷洒试验,分析不同植物幼苗N、P含量及其化学计量比。结果表明:不同浓度酸雨下,杉木、马尾松、香樟和毛竹4种植物叶的N、P含量大于根和茎;不同树种和不同器官的N含量对酸雨淋溶的响应不同,杉木和香樟幼苗的根和叶N含量对酸雨处理响应敏感系数高于茎。在pH3.5和pH4.5时,杉木和马尾松为N限制,毛竹在pH3.5时为N限制,而香樟在pH3.5和pH4.5时为P限制,不同酸雨浓度对植物各器官N:P计量特征存在不同影响,影响植物幼苗N、P含量平衡;杉木、马尾松、香樟和毛竹根N、P含量之间呈正相关,N、P含量表现出一定的比例组成和协调关系。不同植物对于酸雨处理的响应不同,植物营养元素含量及其在各个器官间的分配与植物自身形态结构特点和外界环境变化特征有关。

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	张育萱
	王云琦
	王玉杰
	杨凤
	朱君琳
	郑永林
	李满意
	孟祥江
	薛兰兰

关键词 ：模拟酸雨, 植物器官, 氮, 磷, 化学计量比

Abstract：[Background] Acid rain pollution can indirectly affect plants through direct leaching to plants or by causing soil acidification. Nitrogen (N) and phosphorus (P) are important components for the growth and development of organisms, and acid rain leaching to plant seedlings can affect the N and P content of plants, and different concentrations of acid rain treatment affect different plant species differently. The study area is located in the Jinyun Mountains of Chongqing, which is one of the most affected areas by acid rain in China. The aim of the study is to investigate the relationship between plant nutrients and their stoichiometry and their responses to acid rain by investigating the effects of acid rain on the N and P contents and ecological stoichiometry of plant seedlings. [Methods] Taking two-year Cunninghamia lanceolata, Pinus massoniana, Cinnamomum camphora and Phyllostachys edulis seedlings as the research objects, in May 2021 in Jinyun Mountain, Chongqing, the pH value was set to 7.0 (control), 4.5, 3.5 and 2.5, a total of 4 gradients, record as CK, pH4.5, pH3.5 and pH2.5 respectively,an in situ simulated acid rain spraying trial was carried out for a period of 4 months. The N, P content and stoichiometric ratio of different measured plant seedlings were analyzed, and the nitrogenphosphorus ratio was calculated. [Results] Under different concentrations of acid rain, the N and P contents of leaves of C. lanceolata, P. massoniana, C. camphora and P. edulis were higher than those of roots and stems. The sensitivity coefficient of N content in roots and leaves of seedlings to acid rain treatment was higher than that of stems. At pH3.5 and pH4.5 of C. lanceolata and P. massoniana were N-limited, P. edulis was N-limited at pH3.5, and C. camphora was P-limited at pH3.5 and pH4.5. Organ N:P measured characteristics had different effects, affecting the balance of N and P content in plant seedlings. There was a positive correlation between N and P contents in C. lanceolata, P. massoniana, C. camphora and P. edulis roots, and N and P contents showed a certain proportion of composition and coordination. [Conclusions] Different plants respond differently to acid rain treatment, and the nutrient content of plants and their distribution among various organs are related to the morphological and structural characteristics of the plants themselves and the characteristics of external environmental changes.

Key words： simulate acid rain plant organs nitrogen phosphorus stoichiometric ratio

收稿日期: 2022-11-02

PACS:	Q946.91
	5718.51+2

基金资助:重庆市科技兴林项目“重庆防护林林分结构质量精准提升技术研究”(渝林科研2020 10)

通讯作者: 王云琦(1979—),女,博士,教授,博士生导师。主要研究方向:森林水文和土壤侵蚀。E-mail:wangyunqi@bjfu.edu.cn E-mail: wangyunqi@bjfu.edu.cn

作者简介: 张育萱(1999—),女,硕士研究生。主要研究方向:酸雨胁迫对植物光合生理的影响。E-mail:zhangyuxxuan@163.com

引用本文:

张育萱, 王云琦, 王玉杰, 杨凤, 朱君琳, 郑永林, 李满意, 孟祥江, 薛兰兰. 缙云山4种植物幼苗氮磷含量及生态化学计量特征对模拟酸雨的响应[J]. 中国水土保持科学, 2024, 22(3): 169-178.
ZHANG Yuxuan, WANG Yunqi, WANG Yujie, YANG Feng, ZHU Junlin, ZHENG Yonglin, LI Manyi, MENG Xiangjiang, XUE Lanlan. Nitrogen and phosphorus contents and ecological stoichiometry of seedlings of four plant species in Jinyun Mountain in response to simulated acid rain. SSWC, 2024, 22(3): 169-178.

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http://journal12.magtechjournal.com/Jweb_stbc/CN/10.16843/j.sswc.2022219 或 http://journal12.magtechjournal.com/Jweb_stbc/CN/Y2024/V22/I3/169

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