青海湖流域高寒湿地光合有效辐射特征

doi:10.13866/j.azr.2018.01.07

摘要/Abstract

摘要： 光合有效辐射(PAR)是生态系统过程中的一个重要参数，本文基于青海湖流域小泊湖和瓦颜山湿地气象站观测的辐射资料，对高寒湿地PAR变化特征进行了分析。结果表明：两个站点的太阳总辐射(Q)和PAR值都存在明显的日变化和季节变化特征，Q和PAR一日之中的最大值出现在13:00左右，在一年中，最大值出现在6月，最小值出现在12月。光合有效辐射系数(η_PAR)也存在明显的季节变化特征，最大值出现在7月，主要与这个时期青海湖流域大气水汽含量最多有关。最后，利用瓦颜山数据基于晴空指数(K_t)和太阳总辐射(Q)构建出了一个PAR日值估算模型，并在小泊湖进行了模型的验证，结果表明本研究构建的模型能够满足不同天气条件下青海湖流域PAR的估算要求。

关键词: 总辐射, 光合有效辐射, 高寒湿地, 青海湖流域

Abstract: Photosynthetically active radiation (PAR) is an important parameter in the process of ecosystem. However, there are few reports on the changes of PAR in alpine wetland. Based on the radiation data from the Xiaobohu and Wayanshan wetland meteorological stations in the Qinghai Lake basin, this paper analyzed the characteristics of PAR variation in the alpine wetland. The results showed that the annual total global radiation (Q) and PAR in the Xiaobohu are 6711.6 MJ?m^-2 and 2888.3 MJ?m^-2 respectively, but 5963.4 MJ?m^-2and 2527.5 MJ?m^-2 respectively in the Wayanshan station. The values of Q and PAR in the Wayanshan station are significantly smaller than that in the Xiaobohu station. Both of the Q and PAR values in the two sites had obvious diurnal and seasonal variation, the maximum value of Q and PAR occurred in the afternoon around 13:00. In one year, the maximum Q and PAR value appeared in June, and the minimum value in December. The average annual photosynthetically active radiation coefficient (η_PAR) in the Xiaobohu and Wayanshan were 0.43 and 0.44 respectively. The η_PAR also exist obvious seasonal variation characteristics in the both sites, the maximum value appeared in July, and the main reason was the water vapor content was largest during this periods in the Qinghai Lake basin. Finally, in order to estimate the PAR value in the whole Qinghai Lake basin, a statistical model was constructed based on the clearness index (K_t) and total solar radiation (Q) data in the Wayanshan station. The model was also verified in the Xiaobohu station, the results showed that the model can meet the requirements for estimating the PAR under different weather conditions in the Qinghai Lake basin.

Key words: global radiation, photosynthetically active radiation, alpine wetland, Qinghai Lake basin

高黎明, 张乐乐, 陈克龙, 毛亚辉. 青海湖流域高寒湿地光合有效辐射特征[J]. 干旱区研究, 2018, 35(01): 50-56.

GAO Li-Ming, ZHANG Le-Le, CHEN Ke-Long, MAO Ya-Hui. Characteristics of the Photosynthetically Active Radiation in the Alpine Wetland, Qinghai lake watershed[J]. , 2018, 35(01): 50-56.

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