| 埃格草(Egeria densa)对铵氮胁迫的生长和生理响应 |
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| 引用本文： | 钟爱文.埃格草(Egeria densa)对铵氮胁迫的生长和生理响应[J].环境科学研究,2018,31(1):117-122. |
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| 作者姓名： | 钟爱文 |
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| 作者单位： | 江西省·中国科学院庐山植物园, 江西 庐山 332900 |
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| 基金项目： | 国家自然科学基金项目（31560149）；江西省自然科学基金项目（20151BAB204013） |
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| 摘 要： | 为了解富营养水体中NH4+-N胁迫对埃格草（Egeria densa）的影响，通过室外模拟试验，研究了埃格草在不同ρ（NH4+-N）（0、0.5、2.0 mg/L）下的RGR（relative growth rate，相对生长率）、R/S（root/shoot ratio，根冠比）、w（SC）（SC为可溶性糖，soluble sugar）、w（淀粉）、w（蔗糖）、w（FAA）（FAA为游离氨基酸，free amino acid）、w（NH4+-N）和w（NO3--N）的变化.结果表明:随着外源ρ（NH4+-N）的增加，埃格草的RGR和R/S呈降低的趋势，并且在ρ（NH4+-N）为2.0 mg/L时显著降低（RGR为P < 0.001，R/S为P < 0.05）；埃格草中w（SC）和w（淀粉）在ρ（NH4+-N）为0.5和2.0 mg/L下有不同程度显著降低w（SC）为P < 0.01和P < 0.001，w（淀粉）为P < 0.001和P < 0.05]，w（蔗糖）在ρ（NH4+-N）为2.0 mg/L时显著降低（P < 0.001）；w（FAA）和w（NH4+-N）有随外源ρ（NH4+-N）升高而升高的趋势，并且在ρ（NH4+-N）为2.0 mg/L时升高显著w（FAA）为P < 0.01，w（NH4+-N）为P < 0.05]；w（NO3--N）在ρ（NH4+-N）为0.5和2.0 mg/L下有不同程度显著降低（P < 0.01和P < 0.001）.相关分析表明，w（SC）、w（淀粉）和w（蔗糖）之间呈显著正相关，三者与w（FAA）和w（NH4+-N）之间均呈显著负相关，而与w（NO3--N）呈显著正相关；w（FAA）和w（NH4+-N）呈显著正相关，而二者与w（NO3--N）均呈显著负相关.研究显示，NH4+-N影响埃格草的生长，导致C-N代谢的不平衡.
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| 关 键 词： | 埃格草 铵氮 胁迫 碳氮代谢 |
| 收稿时间： | 2017/5/4 0:00:00 |
| 修稿时间： | 2017/7/14 0:00:00 |
Ammonium Nitrogen Stress on the Growth and Physiological Responses of Egeria densa |
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| ZHONG Aiwen.Ammonium Nitrogen Stress on the Growth and Physiological Responses of Egeria densa[J].Research of Environmental Sciences,2018,31(1):117-122. |
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| Authors: | ZHONG Aiwen |
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| Affiliation: | Lushan Botanical Garden, Jiangxi Province & the Chinese Academy of Sciences, Lushan 332900, China |
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| Abstract: | In order to understand the effects of ammonium nitrogen (NH4+-N) stress on Egeria densa in eutrophic water bodies, morphological and physiological variations such as relative growth rate (RGR), root/shoot ratio (R/S), soluble sugar (SC), starch, sucrose, free amino acid (FAA), NH4+-N, and nitrate nitrogen (NO3--N) of E. densa at different external NH4+-N concentrations of 0, 0.5 and 2.0 mg/L were investigated in an outdoor simulation experiment. The results showed that the RGR and R/S ratio of E. densa showed a tendency to decrease with increasing external NH4+-N concentration, but decreased significantly with 2.0 mg/L NH4+-N. The SC andstarch contents decreased significantly with 0.5 and 2.0 mg/L NH4+-N. The sucrose content decreased significantly with 2.0 mg/L NH4+-N. The FAA and NH4+-N contents tended to increase with increasing external NH4+-N concentration, but increased significantly with 2.0 mg/L NH4+-N. The NO3--N contents tended to decrease significantly with 0.5 and 2.0 mg/L NH4+-N. The SC, starch, and sucrose contents were positively correlated with each other, but were negatively correlated with FAA and NH4+-N and positively correlated with NO3--N. The FAA and NH4+-N were positively correlated with each other, but were negatively correlated with NO3--N. Our experimental results showed that external NH4+-N can affect the growth of E. densa and lead to an imbalance in carbon-nitrogen metabolism. |
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| Keywords: | Egeria densa ammonium nitrogen stress carbon-nitrogen metabolism |
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