乌兰布和沙漠地区多枝柽柳蒸腾耗水特征及其与环境因子的关系

doi:10.13866/j.azr.2025.08.07

Abstract

Abstract:

To clarify the dynamic characteristics of transpiration and water consumption of Tamarix ramosissima under the condition of limited water resources in the Ulan Buh Desert area and their relationship with environmental factors, this study monitored the sap flow rate of T. ramosissima planted in the Ulan Buh Desert area and simultaneously monitored environmental factors such as meteorological factors and soil moisture. The following results were obtained: (1) During the growing season, the sap flow rate of T. ramosissima first increased and then decreased. The cumulative sap flow rate was 50.96 kg, and the average daily sap flow rate was 380.27 g, with noticeable seasonal variation characteristics. (2) Obvious differences were detected in the diurnal variation of T. ramosissima under different weather conditions. The sap flow rate was higher on sunny days than on cloudy days. On rainy days, the sap flow rate of T. ramosissima decreased significantly during the rainfall period. On consecutive typical sunny days, T. ramosissima exhibited obvious transpiration phenomenon at night, and the liquid flow rate during the day was approximately 8.60 times the liquid flow rate at night. (3) Overall, there is a statistically significant strong positive correlation between the sap flow rate of T. ramosissima and the soil water content at 100 cm depth, vapor pressure deficit, and photosynthetically active radiation; however, the correlation coefficient suggests that the actual association strength may be relatively low. This might be because T. ramosissima has adapted relatively well to the local arid environment and shows strong ecological adaptability. These results can provide data support for the efficient utilization of ecological water resource replenishment in arid sandy areas, the gradient configuration of sand-fixing vegetation and ecological sustainable management.

Key words: Tamarix ramosissima, sap flow, environmental factors, desertification control, Ulan Buh Desert

YUAN Zixuan, XIN Zhiming, CHENG Yiben, YU Tao, LIU Yuxuan. Transpiration and water consumption characteristics of Tamarix ramosissima in the Ulan Buh Desert and their relationship with environmental factors[J].Arid Zone Research, 2025, 42(8): 1426-1436.

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References 41

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样株编号	1	2	3
树高/cm	210	240	251
冠幅/cm	200	256	186
茎粗/mm	16.87	13.00	16.87
土壤类型	风沙土	风沙土	风沙土
树龄/a	10	10	10

环境因子	5月	6月	7月	8月	9月	5—9月
平均气温/℃	0.413	0.433^*	-0.116	-0.442^*	-0.255	0.051
最高气温/℃	0.431^*	0.537^**	-0.020	-0.369^*	0.081	0.138
最低气温/℃	0.290	0.298	-0.248	-0.415^*	-0.271	-0.043
相对湿度/%	0.291	-0.080	-0.378^*	0.018	0.209	-0.081
饱和水汽压差/kPa	-0.146	-0.488^**	0.214	-0.035	-0.357	0.241^**
光合有效辐射/（μmol·m^-2·s^-1）	0.423^*	0.120	0.295	-0.128	0.114	0.266^**
降雨量/mm	-0.026	-0.168	-0.191	-0.052	0.481^*	-0.007
10 cm土壤含水量/（m³·m^-3）	-0.345	-0.098	0.160	-0.373^*	-0.150	-0.082
50 cm土壤含水量/（m³·m^-3）	0.147	-0.218	0.445^*	-0.339	-0.384	0.061
100 cm土壤含水量/（m³·m^-3）	0.124	-0.146	0.690^**	-0.332	-0.294	0.185^*

Transpiration and water consumption characteristics of Tamarix ramosissima in the Ulan Buh Desert and their relationship with environmental factors

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