降雪对荒漠生物土壤结皮光合生理特性的影响

司守霞; 李宜轩; 回嵘; 刘立超; 谢敏; 王艳莉

doi:10.7522/j.issn.1000-694X.2017.00013

中国沙漠 >

2018 , Vol. 38 >Issue 3: 560 - 567

DOI: https://doi.org/10.7522/j.issn.1000-694X.2017.00013

生物与土壤

降雪对荒漠生物土壤结皮光合生理特性的影响

司守霞 ,
李宜轩 ,
回嵘 ,
刘立超 ,
谢敏 ,
王艳莉

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1. 河南林业职业学院, 河南洛阳 471002;
2. 沈阳农业大学农学院, 辽宁沈阳 110866;
3. 中国科学院西北生态环境资源研究院沙坡头沙漠试验研究站, 甘肃兰州 730000

司守霞(1964-),女,河南新乡人,硕士,副教授,主要从事植物学研究。E-mail:ssxvip100@126.com

收稿日期: 2016-12-06

修回日期: 2017-03-07

网络出版日期: 2018-11-06

基金资助

国家自然科学基金项目（41701104，41771105）；中国科学院"西部之光"博士项目

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Effects of Snow on the Photosynthetic Physiological Characteristics of Biological Soil Crusts in A Desert Region

Si Shouxia ,
Li Yixuan ,
Hui Rong ,
Liu Lichao ,
Xie Min ,
Wang Yanli

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1. Henan Forestry Vocational College, Luoyang 471002, Henan, China;
2. Agronomy College, Shenyang Agricultural University, Shenyang 110866, China;
3. Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy Sciences, Lanzhou 730000, China

Received date: 2016-12-06

Revised date: 2017-03-07

Online published: 2018-11-06

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摘要

生物土壤结皮（BSC）广泛分布在干旱、半干旱区，对荒漠生态系统的稳定、平衡等具有重要意义。初步探讨了降雪量对腾格里沙漠东南缘藻类、地衣和藓类结皮叶绿素荧光参数、光合色素、丙二醛（MDA）及可溶性蛋白含量的影响。结果表明：结皮光合生理特性对降雪量的响应有显著差异。适量降雪激发3种结皮PSⅡ反应中心，引起光合色素、可溶性蛋白合成升高，MDA含量降低；过量降雪导致藻类和地衣结皮光合电子传递受阻，光合色素、可溶性蛋白合成减少，MDA含量升高，产生光抑制现象。适量冬季降雪对结皮具有一定的促进作用，而藓类结皮更能适应极端降雪环境，但相关分子机制还需深入研究。

关键词： 水分; 生物土壤结皮; 降雪; 叶绿素荧光; 光合色素

本文引用格式

司守霞 , 李宜轩 , 回嵘 , 刘立超 , 谢敏 , 王艳莉 . 降雪对荒漠生物土壤结皮光合生理特性的影响[J]. 中国沙漠, 2018 , 38(3) : 560 -567 . DOI: 10.7522/j.issn.1000-694X.2017.00013

Abstract

Biological soil crusts (BSC) are widespread in arid and semi-arid regions, and play significant roles in ecosystem stability maintenance and ecological balance. With successional stages of BSC (algae, lichen and moss) in the southeastern fringe of the Tengger Desert as test objects, and studies preliminarily the effects of snow on chlorophyll fluorescence parameters, photosynthetic pigments, malondialdehyde (MDA), and soluble protein of different types of crusts. Results show that different BSC species exhibit different responses to snow on photosynthetic physiological characteristics. A moderate amount of snow stimulates photosystem Ⅱ reaction center, and increases contents of photosynthetic pigments and soluble protein, decrease MDA content, while excess amount of snow prevents photosynthetic electron transport of algae and lichen crusts, and photosynthetic pigments contents and soluble protein synthesis decreases, MDA content increases, which cause photoinhibition. Our study indicates a moderate amount of winter snow is favorable to BSC at the photosynthetic physiological level, while moss crusts are more suitable to excess amount of snow, its relative molecular mechanisms still need further research.

Key words： water; biological soil crusts (BSC); snow; chlorophyll fluorescence; photosynthetic pigments

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