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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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

Received: 02 November 2022

PACS:	Q946.91
	5718.51+2

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	ZHANG Yuxuan
	WANG Yunqi
	WANG Yujie
	YANG Feng
	ZHU Junlin
	ZHENG Yonglin
	LI Manyi
	MENG Xiangjiang
	XUE Lanlan

Cite this article:

ZHANG Yuxuan,WANG Yunqi,WANG Yujie, et al. Nitrogen and phosphorus contents and ecological stoichiometry of seedlings of four plant species in Jinyun Mountain in response to simulated acid rain[J]. SSWC, 2024, 22(3): 169-178.

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

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