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

doi:10.3969/j.issn.1000-2006.201909036

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

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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 Yaru¹(), XIN Zhiming¹, LI Yonghua²^,^*(), MA Yingbin¹, DONG Xue¹, LUO Fengmin¹, LI Xinle¹, DUAN Ruibin¹

1. Experimental Center of Desert Forestry, Chinese Academy of Forestry, Inner Mongolia Dengkou Desert Ecosystem National Observation Research Station, Dengkou 015200,China
2. Institute of Destertification Studies, Chinese Academy of Forestry, Beijing 100091,China

Received:2019-09-20 Revised:2020-09-01 Online:2020-11-30 Published:2020-12-07
Contact: LI Yonghua E-mail:hu_angyaru@126.com;lyhids@caf.ac.cn

Abstract

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

CLC Number:

Q948.1
S718

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

Figures/Tables 6

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因子 factors	季节 season	茎干液流 sap flow	太阳总辐射 total solar radiation	空气温度 air temperature	空气相对湿度 air relative humidity	风速 wind speed
茎干液流 sap flow	春季spring	1	0.844^**	0.739^**	-0.567^**	0.607^**
	夏季summer	1	0.590^**	0.470^**	-0.484^**	0.326^**
	秋季autumn	1	0.733^**	0.673^**	-0.538^**	0.440^**
太阳总辐射 total solar radiation	春季spring	0.844^**	1	0.643^**	-0.480^**	0.540^**
	夏季summer	0.590^**	1	0.644^**	-0.614^**	0.514^**
	秋季autumn	0.733^**	1	0.771^**	-0.597^**	0.516^**
温度 air temperature	春季spring	0.739^**	0.643^**	1	-0.809^**	0.581^**
	夏季summer	0.470^**	0.644^**	1	-0.886^**	0.612^**
	秋季autumn	0.673^**	0.771^**	1	-0.904^**	0.677^**
相对湿度 air relative humidity	春季spring	-0.567^**	-0.480^**	-0.809^**	1	-0.577^**
	夏季summer	-0.484^**	-0.614^**	-0.886^**	1	-0.714^**
	秋季autumn	-0.538^**	-0.597^**	-0.904^**	1	-0.628^**
风速 wind speed	春季spring	0.607^**	0.540^**	0.581^**	-0.577^**	1
	夏季summer	0.326^**	0.514^**	0.612^**	-0.714^**	1
	秋季autumn	0.440^**	0.516^**	0.677^**	-0.628^**	1

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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