| 秃瓣杜英幼苗对模拟酸雨的荧光响应及养分元素分配特征 |
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| 引用本文： | 陈圣贤,董莲春,伊力塔,俞飞,陈景锋.秃瓣杜英幼苗对模拟酸雨的荧光响应及养分元素分配特征[J].浙江农林大学学报,2019,36(3):451-458. |
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| 作者姓名： | 陈圣贤 董莲春 伊力塔 俞飞 陈景锋 |
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| 作者单位： | 浙江农林大学 林业与生物技术学院, 浙江 杭州 311300 |
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| 基金项目： | 浙江省自然科学基金资助项目LQ17C160004国家自然科学基金资助项目31100325 |
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| 摘 要： | 利用模拟酸雨喷淋试验，研究不同酸雨梯度pH 2.5（重度酸雨）、pH 4.0（中度酸雨）和pH 5.6（轻度酸雨）]对秃瓣杜英Eleocarpus glabripetalus幼苗叶绿素参数、生物量及对土壤元素吸收的影响。结果表明:幼苗叶绿素参数随酸雨pH值的降低而升高，各处理组相对叶绿素含量均高于对照组；最大光化学量子产量（Fv/Fm）随酸雨pH值的降低而升高，各处理组较对照组升高4.22%，6.07%和6.86%，与对照组差异显著（P < 0.05）。各处理组叶片氮元素质量分数均大于对照组，但差异不显著（P>0.05）；所有器官磷、钾质量分数总和均小于对照组，重、轻度酸雨组茎的磷质量分数显著低于对照组（P < 0.05）；所有器官镁质量分数均小于对照组，但差异不显著（P>0.05）。重、中度酸雨组幼苗地上部铜元素质量分数和转移系数高于对照组，各处理组锌元素转移系数和富集系数均显著高于对照组（P < 0.05）。综合分析认为:酸雨增加了幼苗的相对叶绿素含量，提高了幼苗的光合能力；促进了幼苗生物量重新分配，使得根系更加健壮，从而促进根系对土壤矿质元素的吸收，增强了植物对环境胁迫的抵抗力；提高了根系锌元素转移系数，从而加大幼苗对重金属锌的忍耐作用。
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| 关 键 词： | 植物生理学 酸雨胁迫 生物量 叶绿素参数 秃瓣杜英 矿质元素 |
| 收稿时间： | 2018-05-31 |
Chlorophyll fluorescence response and nutrient distribution of Elaeocarpus glabripetalus seedlings with simulated acid rain |
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| CHEN Shengxian,DONG Lianchun,Yilita,YU Fei,CHEN Jingfeng.Chlorophyll fluorescence response and nutrient distribution of Elaeocarpus glabripetalus seedlings with simulated acid rain[J].Journal of Zhejiang A&F University,2019,36(3):451-458. |
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| Authors: | CHEN Shengxian DONG Lianchun Yilita YU Fei CHEN Jingfeng |
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| Institution: | School of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China |
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| Abstract: | To find the effects of chlorophyll parameters and biomass of Elaeocarpus glabripetalus seedlings and the absorption of soil elements for different levels of acidity, a simulated acid rain spray test with three acidity levelspH 2.5 (severe acid rain), pH 4.0 (moderate acid), and pH 5.6 (mild acid rain)], as well as a control group (ck) was used. Results showed that the chlorophyll parameters of E. glabripetalus seedlings increased with a decrease in the pH of acid rain. The relative chlorophyll content (SPAD) in each treatment group was higher than the control group. The maximum chemical quantum yield (Fv/Fm) increased with a decrease in pH of acid rain, and there was a significant difference between the treatment groups and ck (P < 0.05). The leaf nitrogen (N) mass fraction of each treatment group was not significantly different from ck (P>0.05). The phosphorus (P) mass fraction for the heavy and mild acid rain group was significantly lower than ck (P>0.05). Seedlings in the upper part of the mass fraction and transfer coefficients of heavy and moderate acid groups were higher than ck. The zinc (Zn) transfer coefficients and enrichment coefficients of each treatment group were significantly higher than ck (P < 0.05). Based on the comprehensive analysis, acid rain increased the chlorophyll content of seedlings, and improved the photosynthetic capacity of seedlings. Acid rain also promoted the redistribution of seedlings biomass, making the root system more robust, thus promoting the absorption of mineral elements in the roots and enhancing the plant's resistance to environmental stress. In addition, acid rain increased the Zn transfer coefficient of roots thereby increasing the tolerance of seedlings to heavy metal Zn. Overall, this study provided a scientific basis for nutrient distribution characteristics and physiological response mechanism of Elaeocarpus glabripetalus seedlings with acid rain stress. |
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