Seasonal variation of the stem sap flow of artificial Haloxylon ammodendron (C.A.Mey.) Bunge and its relationship with meteorological factors in Ulan Buh Desert

HUANG Yaru, XIN Zhiming, LI Yonghua, MA Yingbin, DONG Xue, LUO Fengmin, LI Xinle, DUAN Ruibin

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (6) : 131-139.

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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (6) : 131-139. DOI: 10.3969/j.issn.1000-2006.201909036

Seasonal variation of the stem sap flow of artificial Haloxylon ammodendron (C.A.Mey.) Bunge and its relationship with meteorological factors in Ulan Buh Desert

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Abstract

【Objective】The water use process of artificially planted Haloxylon ammodendron (C.A.Mey.) Bunge in 1979 in Ulan Buh Desert was revealed to provide a theoretical support for the management of the local H. ammodendron forest. 【Method】The PS-TDP8 tree stem flow monitoring system and automatic meteorological station were used to observe the sap flow changes of H. ammodendron in Ulan Buh Desert and surrounding meteorological factors. 【Result】Diurnal variations of the stem sap flow of H. ammodendron during sunny days showed a “single peak”. The daily change trend of H. ammodendron stem sap flow during spring, summer and autumn was consistent. The sap flow rate during the day was higher than that during the night; however, the sap flow rate at night varied slightly. In May, July and September, the sap flow of H. ammodendron with a stem diameter of 12.5 cm started earlier than that with a stem diameter of 8.95 cm, and the average sap flow rate was also higher. The peak sap flow of H. ammodendron with a stem diameter of 12.5 cm in May, July and September was 2.90, 4.18 and 3.15 cm/h, respectively, and daily cumulative volumes of sap flow were 12.29, 14.23 and 9.44 L, respectively. The peak sap flow of H. ammodendron with a diameter of 8.95 cm during the same period was 1.06, 1.20 and 1.07 cm/h, respectively, and daily cumulative volumes of sap flow were 2.84, 3.68 and 3.10 L, respectively; H. ammodendron Bunge with the same diameter had the largest daily accumulation of sap flow in July. The sap flow of H. ammodendron was “single-peaked” on sunny days and “double-peaked” on rainy days. The peak sap flow on rainy days and nights was lower than that on sunny days. In summer, the stem sap flow started the earliest, the peak appeared the earliest, and the peak was the largest. The spring sap flow started the latest, the peak appeared the latest, and the peak was the smallest. Whether it was spring, summer or autumn, there was a weak liquid flow in H. ammodendron at night. 【Conclusion】In spring, the meteorological factors affecting the flow rate of H. ammodendron mainly included solar radiation, air temperature, and wind speed. In summer, the meteorological factors affec-ting the flow rate of H. ammodendron mainly included solar total radiation, relative humidity of air, and wind speed. In autumn, the meteorological factors affecting the flow rate of H. ammodendron mainly included solar total radiation and air temperature.

Key words

Haloxylon ammodendron (C.A.Mey.) Bunge / sap flow / Ulan Buh Desert / meteorological factors

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HUANG Yaru , XIN Zhiming , LI Yonghua , et al . Seasonal variation of the stem sap flow of artificial Haloxylon ammodendron (C.A.Mey.) Bunge and its relationship with meteorological factors in Ulan Buh Desert[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2020, 44(6): 131-139 https://doi.org/10.3969/j.issn.1000-2006.201909036

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Abstract
采用热平衡包裹式茎干液流仪和微气象监测系统,模拟中国西北河西走廊中段荒漠生态系统典型固沙植物沙拐枣2014年6—9月茎干液流变化过程.结果表明: 沙拐枣茎干液流密度日变化呈宽幅单峰型,其峰值滞后于光合有效辐射峰值约30 min,提前于气温和水汽压亏缺峰值约120 min,其日变化与这3个环境因子日变化之间存在非对称性响应.观测期间,茎干液流密度变化与大气蒸腾需求密切相关,光合有效辐射、气温和水汽压亏缺是影响沙拐枣茎干液流密度的主要气〖JP2〗象因子.构建的基于茎干液流密度与气象因子响应关系的模型,能够比较准确地模拟不同天气条件沙拐枣液流密度的变化,而且经过时滞校正模型模拟精度进一步提高,但是该模型对低液流密度和夜间液流密度存在低估,这主要与植物的生理特征有关.
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