期刊：
FRONTIERS IN PLANT SCIENCE,2025年16:1563166 ISSN：1664-462X
通讯作者：
Zhang, LJ;You, QG
作者机构：
[Liu, Feiyao; Feng, Chang; Liu, Guohua] Hengyang Normal Univ, Coll Geog & Tourism, Hengyang, Peoples R China.;[Zhang, Lijuan] Hengyang Normal Univ, Coll Foreign Languages, Hengyang, Peoples R China.;[You, Quangang; Xue, Xian] Chinese Acad Sci, Drylands Salinizat Res Stn, Northwest Inst Ecoenvironm & Resources, Lanzhou, Peoples R China.;[You, Quangang; Xue, Xian] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecol Safety & Sustainable Dev Arid Lands, Lanzhou, Peoples R China.
通讯机构：
[You, QG ] C;[Zhang, LJ ] H;Hengyang Normal Univ, Coll Foreign Languages, Hengyang, Peoples R China.;Chinese Acad Sci, Drylands Salinizat Res Stn, Northwest Inst Ecoenvironm & Resources, Lanzhou, Peoples R China.;Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecol Safety & Sustainable Dev Arid Lands, Lanzhou, Peoples R China.
关键词：
desert-oasis transition zone;meteorological factors;phreatophyte xerophytic shrub;sap flow;soil water variability
摘要：
Plant transpiration is a fundamental process for maintaining the water cycle, regulating temperature and facilitating nutrient uptake, while also playing a critical role in climate regulation and ecosystem services. However, a significant knowledge gap remains in the understanding of how plant transpiration responds to changes in precipitation patterns within dryland ecosystems. In the present study, the stem sap flow of the phreatophyte xerophytic shrub Tamarix ramosissima, meteorological factors, soil moisture content, and bare soil evaporation were examined to assess the effects of two different rainfall categories (category I: lower mean rainfall amount and duration; category II: higher mean rainfall amount and duration) on stem sap flow dynamics. Our results reveal that the rainfall reduced the stem sap flow by 46.5% and 29.5% compared to the previous days across rainfall category I and II, respectively. The daily and diurnal variation of stem sap flow during the three days following rainfall showed non-significant variation compared to pre-rainfall, regardless of rainfall category. The soil moisture content at depth of 0-40 cm (SMC(0-40cm)) exhibits a pronounced increase to rainfall events, irrespective of rainfall category, although these events did not significantly increase the soil available moisture content within this depth. Concurrently, the weighing micro-lysimeters utilized in this study revealed that approximately 91.5% of the total precipitation during the experimental period evaporated into the atmosphere. In addition, the daily stem sap flow on the rainfall day and the following three days post rainfall was strongly positively correlated with photosynthetically active radiation, air temperature, and vapor pressure deficit within the two rainfall categories rather than with SMC(0-40cm). Together, our findings indicate that the effects of rainfall variability on stem sap flow of T. ramosissima are primarily driven by meteorological factors, independent of the rainfall category. The results of this study provide a valuable insight for assessing species-specific water-use strategies and implementing effective reforestation practices in the future.
期刊：
Computer-Aided Design and Applications,2022年19(S7):111-121 ISSN：1686-4360
通讯作者：
Yin, Jing(smilecho@163.com)
作者机构：
[Jing Yin] College of Foreign Languages, Hengyang Normal University, Hunan, Hengyang;421002, China;[Ting Yin] School of Foreign Languages, Guangdong Polytechnic Normal University, Guangdong, Guangzhou;510665, China;[Jing Yin] 421002, China
通讯机构：
[Yin, J.] C;College of Foreign Languages, Hunan, China
