元宝枫幼苗生长及光合特性对水肥耦合的响应

李潘亭, 杜满义, 王玥, 裴顺祥, 辛学兵

南京林业大学学报（自然科学版） ›› 2024, Vol. 48 ›› Issue (5) : 113-122.

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南京林业大学学报（自然科学版）
PDF(1794 KB)
南京林业大学学报（自然科学版） ›› 2024, Vol. 48 ›› Issue (5) : 113-122. DOI: 10.12302/j.issn.1000-2006.202302008
研究论文

元宝枫幼苗生长及光合特性对水肥耦合的响应

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The growth and photosynthetic characteristics of Acer truncatum seedlings in response to soil water and fertilizer coupling

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摘要

【目的】探究元宝枫(Acer truncatum)幼苗生长及光合生理特性对水肥耦合的响应,分析比较元宝枫幼苗生长最佳水肥组合。【方法】以1年生元宝枫幼苗为研究对象,采用土壤含水率及氮、磷、钾施肥量4因素4水平正交试验设计,共计16个处理,水肥耦合试验后测定元宝枫幼苗生长指标、叶片相对叶绿素含量SPAD值、光合特性及光响应曲线。【结果】随施肥量的增加,各指标大致呈现先上升后下降的趋势。当土壤含水率为75%,施N、P、K量为1.2、1.8、0 g/株时,元宝枫幼苗地径、总生物量显著高于其他处理。合理的水肥耦合可以显著提高元宝枫幼苗苗高、地径及总生物量。此外,各水肥耦合处理对弱光的利用能力差异不大,氮肥对元宝枫幼苗的最大净光合速率和光饱和点影响显著。各处理间水分利用效率(WUE)无显著性差异,表明元宝枫幼苗在较低土壤含水率下也能正常生长,抗旱能力强。水肥对元宝枫幼苗生长影响由高到低排序为氮肥>土壤含水率>钾肥>磷肥,基于综合评分法可知最佳的水肥组合为T14,即土壤含水率75%、氮肥1.2 g/株、磷肥1.8 g/株和钾肥0 g/株。【结论】水肥耦合效应对地径和生物量影响显著,对苗高影响不显著,土壤含水率、氮肥对各生长指标影响显著,研究结果可为元宝枫水肥合理利用提供理论依据。

Abstract

【Objective】 This research aims to investigate the growth and photosynthetic physiological characteristics of Acer truncatum seedlings in response to water-fertilizer coupling, and to analyze the optimal water-fertilizer combination for the growth of A. truncatum seedlings. 【Method】 One-year-old A. truncatum seedlings were subjected to varying water and fertilizer couplings in an orthogonal test design involving four factors and four levels of soil water content, nitrogen, phosphorus and potassium, resulting in 16 treatments. Growth indexes, relative chlorophyll content of the leaves SPAD values, photosynthetic characteristics, and light response curves were measured after the treatments. 【Result】 The growth indices generally increased firstly and then decreased with increasing fertilization amount. At a soil water content of 75%,1.2, 1.8 and 0 g/plant of N, P, K, respectively, the diameter and total biomass of the plant were significantly higher than those of other treatments. Suitable soil water and fertilizer coupling could significantly improve the height, ground diameter, and total biomass of A. truncatum seedlings. Moreover, there was no significant difference in the utilization ability of low light among different soil water and fertilizer coupling treatments, and nitrogen fertilizer had significant effects on the maximum net photosynthetic rate and light saturation point of A. truncatum seedlings. In addition, there was no significant difference in water use efficiency (WUE) between the different treatments for A. truncatum seedlings. The seedlings grew normally even under lower water conditions, such as 45% soil water content, and exhibited strong drought resistance. The effects of soil water and fertilizer on the growth of A. truncatum seedlings were ranked from high to low as nitrogen fertilizer > soil water content > potash fertilizer > phosphate fertilizer, based on a comprehensive scoring method. The optimal combination of water and fertilizer was 75% soil water content, with fertilizer comprising 1.2 g of nitrogen, 1.8 g of phosphorous, and 0 g of potassium per plant. 【Conclusion】 Water-fertilizer coupling had a significant effect on ground diameter and biomass of A. truncatum seedlings, but an insignificant effect on seedling height, while soil water content and nitrogen fertilizer also had a significant effect on the growth indexes of the seedlings. These findings provide a theoretical basis for the appropriate use of soil water and fertilizer in A. truncatum.

关键词

元宝枫 / 水肥耦合 / 光合特性 / 生长指标

Key words

Acer truncatum / water and fertilizer coupling / photosynthetic characteristics / growth index

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李潘亭, 杜满义, 王玥, 等. 元宝枫幼苗生长及光合特性对水肥耦合的响应[J]. 南京林业大学学报（自然科学版）. 2024, 48(5): 113-122 https://doi.org/10.12302/j.issn.1000-2006.202302008
LI Panting, DU Manyi, WANG Yue, et al. The growth and photosynthetic characteristics of Acer truncatum seedlings in response to soil water and fertilizer coupling[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2024, 48(5): 113-122 https://doi.org/10.12302/j.issn.1000-2006.202302008
中图分类号： S723   

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中国林科院中央级公益性科研院所基本科研业务费专项资金重点项目(CAFYBB2020ZB005)

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