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油蒿(Artemisia ordosica)光化学量子效率和非光化学淬灭的动态及其影响因子

吴雅娟1,2,查天山1,2,贾昕1,2**,秦树高1,2,李媛1,2,王奔1,2   

  1. (1北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083; 2北京林业大学水土保持国家林业局重点实验室, 北京 100083)
  • 出版日期:2015-02-07 发布日期:2015-02-07

Temporal variation and controlling factors of photochemical efficiency and non-photochemical quenching in Artemisia ordosica.

WU Ya-juan1,2, ZHA Tian-shan1,2, JIA Xin1,2**, QIN Shu-gao1,2, LI Yuan1,2, WANG Ben1,2   

  1. (1School of Soil and Water Conservation, Yanchi Research Station, Beijing Forestry University,  Beijing 100083, China;
    2Key Laboratory of Soil and Water Conservation of Soil Foresty Administration, Bejing Forestry University, Beijing 100083, China)
  • Online:2015-02-07 Published:2015-02-07

摘要:

叶绿素荧光的测定是探究干旱半干旱区沙生植物对环境变化响应的重要手段,叶绿素荧光的动力学研究对认识植物适应环境胁迫的生理生态过程与机制具有重要意义。本文于2012年6—10月研究了宁夏盐池油蒿(Artemisia ordosica)的光化学量子效率(Φ)和非光化学淬灭(NPQ)的季节变化和日变化,及其与光合有效辐射(PAR)、相对湿度(RH)和空气温度(Ta)的关系。结果表明:在观测期内,油蒿的ΦPARTa升高而降低,随RH的升高而升高,NPQ的变化与Φ相反;在日变化尺度,油蒿的Φ(R2>0.92)和PAR(R2>0.90)与PAR紧密相关,而与空气温度(Ta)和相对湿度(RH)的日变化存在3~4 h的滞后;此外,在相同PAR下,生长季前期的Φ大于后期,生长季旺期的NPQ大于末期;因此,PAR、TaRHΦNPQ均有影响。

 

 

关键词: 冬季覆盖作物, 总有机碳, 土壤碳库管理指数, 有机碳储量, 活性有机碳

Abstract: Knowledge on the dynamics and environmental controls of leaf chlorophyll fluorescence is important in understanding how plant physiological processes respond to abiotic stresses such as drought, strong radiation and extreme temperature in arid and semiarid ecosystems. Therefore, chlorophyll fluorescence measurements are an effective tool for exploring plant adaptive strategies. We conducted in situ field measurements of chlorophyll fluorescence on Artemisia ordosica in Yanchi, Northwest China from June to October in 2012. The objectives were to explore seasonal and diurnal variations of chlorophyll fluorescence parameters, and to examine the relationships between chlorophyll fluorescence parameters and environmental factors. The results showed that the photochemical efficiency (Φ) decreased with increasing photosynthetically active radiation (PAR) and air temperature (Ta), but increased with relative humidity (RH). Therefore, PAR was likely the primary factor driving the changes in chlorophyll fluorescence parameters. Both Φ and the nonphotochemical quenching (NPQ) of A. ordosica varied with PAR on a diurnal basis. The diurnal trends of both Ta and RH, however, lagged the chlorophyll fluorescence parameters by 3-4 h. Given the same PAR, Φ in the early growing season was greater than that in the late growing season, and NPQ was higher in the midgrowing season period than at the late stage of the growing season.

Key words: organic carbon storage, active organic carbon, total organic carbon, carbon pool management index, winter cover crop