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Air temperature is the main driving factor of radiation use efficiency and carbon storage of mature Norway spruce stands under global climate change
International Journal of Biometeorology ( IF 3.2 ) Pub Date : 2020-06-19 , DOI: 10.1007/s00484-020-01941-w
Jakub Černý 1 , Radek Pokorný 2 , Monika Vejpustková 3 , Vít Šrámek 3 , Pavel Bednář 1
Affiliation  

Plant growth is affected by light availability, light capture, and the efficiency of light energy utilisation within the photosynthetic uptake processes. The radiation use efficiency (RUE) of four even-aged, fully stocked mature Norway spruce stands along a temperature, precipitation, and altitudinal gradient of the Czech Republic was investigated. A new straightforward, methodological approach involving an analysis of digital hemispherical photographs for RUE estimation was applied. The highest annual RUE value (0.72 g MJ−1) was observed in the stand characterised by the lowest mean annual air temperature, the highest annual amount of precipitation, located at the highest altitude, and with the lowest site index reflecting site fertility. From the viewpoint of global climate change mitigation, this stand fixed 4.14 Mg ha−1 and 13.93 Mg ha−1 of carbon units and CO2 molecules into above-ground biomass, respectively. The lowest RUE value (0.21 g MJ−1) within the studied growing season was found in the stand located at the lowest altitude representing the site with the highest mean air temperature and the lowest amount of precipitation where 1.27 Mg ha−1 and 4.28 Mg ha−1 of carbon units and CO2 molecules, respectively, were fixed. From the tested meteorological variables (mean air temperature, the monthly sums of temperature, precipitation, and air humidity), RUE was only significantly dependent on air temperature. Therefore, global warming can lead to diminishing RUE and carbon sequestration in Norway spruce stands, especially at low altitudes.

中文翻译:

气温是全球气候变化下成熟挪威云杉林辐射利用效率和碳储量的主要驱动因素

植物生长受光的可用性、光捕获和光合作用吸收过程中光能利用效率的影响。沿着捷克共和国的温度、降水和海拔梯度调查了四个均匀老化、完全放养的成熟挪威云杉的辐射利用效率 (RUE)。应用了一种新的直接的方法论方法,该方法涉及分析用于 RUE 估计的数字半球照片。在年平均气温最低、年降水量最高、海拔最高、反映立地肥力的立地指数最低的林分中观察到最高的年 RUE 值(0.72 g MJ-1)。从减缓全球气候变化的角度来看,该展位固定为 4.14 Mg ha-1 和 13。93 Mg ha-1 的碳单元和 CO2 分子分别转化为地上生物量。在研究的生长季节内发现最低 RUE 值 (0.21 g MJ-1) 位于最低海拔的林分,代表平均气温最高和降水量最低的地点,其中 1.27 Mg ha-1 和 4.28 Mg ha-1 的碳单元和 CO2 分子分别是固定的。从测试的气象变量(平均气温、每月温度、降水和空气湿度的总和)来看,RUE 仅显着依赖于气温。因此,全球变暖会导致挪威云杉林的 RUE 和碳固存减少,尤其是在低海拔地区。21 g MJ-1) 在研究的生长季节内发现于位于最低海拔的林分,代表平均气温最高和降水量最低的地点,其中 1.27 Mg ha-1 和 4.28 Mg ha-1 的碳单位和 CO2 分子分别是固定的。从测试的气象变量(平均气温、每月温度、降水和空气湿度的总和)来看,RUE 仅显着依赖于气温。因此,全球变暖会导致挪威云杉林的 RUE 和碳固存减少,尤其是在低海拔地区。21 g MJ-1) 在研究的生长季节内发现于位于最低海拔的林分,代表平均气温最高和降水量最低的地点,其中 1.27 Mg ha-1 和 4.28 Mg ha-1 的碳单位和 CO2 分子分别是固定的。从测试的气象变量(平均气温、每月温度、降水和空气湿度的总和)来看,RUE 仅显着依赖于气温。因此,全球变暖会导致挪威云杉林的 RUE 和碳固存减少,尤其是在低海拔地区。被固定。从测试的气象变量(平均气温、每月温度、降水和空气湿度的总和)来看,RUE 仅显着依赖于气温。因此,全球变暖会导致挪威云杉林的 RUE 和碳固存减少,尤其是在低海拔地区。被固定。从测试的气象变量(平均气温、每月温度、降水和空气湿度的总和)来看,RUE 仅显着依赖于气温。因此,全球变暖会导致挪威云杉林的 RUE 和碳固存减少,尤其是在低海拔地区。
更新日期:2020-06-19
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