| 摘要: |
| 为探讨盐度对碱蓬生理指标和反射光谱的响应，以滨海湿地盐地碱蓬（Suaeda salsa）为研究对象，采用自然光照盆栽试验方法研究8种盐度（0（对照，CK）、5、10、15、20、25、30和35）对碱蓬幼苗的生理指标（株高、鲜质量、干质量、叶绿素含量、可溶性总糖和蛋白质质量比）和反射光谱的响应。研究结果表明：盐度对碱蓬植株生理指标存在显著响应，低中盐度（0~25）对植株生长有促进作用，而高盐度（30~35）对植株生长起到抑制作用； 25盐度下，碱蓬株高、鲜质量、干质量、叶片叶绿素含量、可溶性总糖质量比均高于其他盐度和对照组；不同盐度处理下的碱蓬植株蛋白质质量比均高于对照组；盐度对碱蓬反射光谱存在明显响应，碱蓬在绿光和近红外波段的反射率随着盐度的增加而逐渐减小；通过相关分析判断出碱蓬株高、鲜质量、干质量、叶绿素含量、可溶性总糖和蛋白质质量比的诊断波段，分别是547、555、548、556、546和2 300 nm。碱蓬高光谱特征指数MTCI、MNDVI1、DCNI、TCARI/OSAVI和R546在不同盐度下存在明显差异，可作为盐分胁迫的高光谱响应诊断指标。分析盐度对碱蓬生理指标和反射光谱的响应，可为深入研究碱蓬对退化滨海湿地生态修复具有重要参考意义。 |
| 关键词: 滨海湿地 盐地碱蓬(Suaeda salsa) 盐度 反射光谱 生理指标 |
| DOI：10.11759/hykx20180510001 |
| 分类号:P748 |
| 基金项目:国家自然科学基金资助项目（41506106，31270745）；连云港市科技计划重大项目（CN1510）；江苏省测绘地理信息局科研项目（JSCHKY201709）；海岸带地理环境监测国家测绘地理信息局重点实验室开放基金资助项目（GE-2017-003）；江苏省研究生实践创新计划项目（SJCX17_0706）；江苏省海洋技术品牌专业建设项目（PPZY2015B116） |
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| Effects of salinity on physiological indicators and reflectance spectra of Suaeda salsa in coastal wetlands |
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LU Xia, LIN Ya-li, ZHAO Qian, GU Yang, WU Ya-nan, WANG Xiao-jing
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School of Geomatics and Marine Information, Huaihai Institute of Technology, Lianyungang 222005, China
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| Abstract: |
| In order to analyze the response of physiological indicators (plant height, chlorophyll content, fresh weight, dry weight, soluble total sugar content, and protein content) and reflectance spectra to changes in salinity, Suaeda salsa in coastal wetlands was studied under different simulated salinity environments (0 (control group, CK), 5, 10, 15, 20, 25, 30, 35). The results showed that salinity levels had a significant effect on the physiological indicators of Suaeda salsa plants. Low salinity levels had a stimulative effect on plant growth while high salinity levels had an inhibitory effect. At 25 g/kg salt concentration, plant height, leaf chlorophyll content, fresh weight, dry weight, and total soluble sugar content of Suaeda salsa were higher than those at other salinity levels and the control group. The protein content of Suaeda salsa plants treated with different salinity levels was higher than that of the control group. The salinity levels showed an obvious correlation with the reflectance spectra of Suaeda salsa plants. The reflectance of Suaeda salsa in the green and near-infrared bands gradually decreases with increasing salinity treatments. Through correlation analysis, the sensitive bands of the plant height, fresh weight, dry weight, chlorophyll content, soluble total sugar content, and protein content were determined to be 547, 555, 548, 556, 546, and 2300 nm, respectively. The difference between hyper-spectral characteristics variables such as MTCI, MNDVI1, DCNI, TCARI/OSAVI, and R546 under different salinities was relative large. Therefore, they could be taken as the hyper-spectral indicators under salt stress. The analysis of the response of physiological indicators and reflectance spectra of Suaeda salsa to salinity can provide an important reference for the further study of the ecological restoration of degraded coastal wetlands. |
| Key words: coastal wetland Suaeda salsa salt salinity reflectance spectra physiological indicators |
