干旱区生态环境知识资源中心(Arid): The effect of time scales on the distribution of evapotranspiration and driving factors in desert grasslands

Arid

DOI	10.1016/j.agwat.2023.108348
	The effect of time scales on the distribution of evapotranspiration and driving factors in desert grasslands
	Han, Xin; Zhang, Baozhong; Liu, Tiejun; Wang, Jun; Zhou, Qingyun; Che, Zheng
通讯作者	Zhang, BZ
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2023
卷号	284
英文摘要	Promoting the reasonable allocation of evaporation (E) and transpiration (T) at a certain time scale is important for controlling the grassland desertification. Nevertheless, evapotranspiration (ET) and its components on a single time scale often cannot guarantee the dynamic and reasonable distribution of E and T. This study quantified ET and its component distribution in different time scales of the plant-growing season in desert grassland ecosystems to address this contradiction. Further the main driving factors of ET and its components at different time scales were clarified under multi-factor coupling. Results indicated that E was the leading component of ET in the ecosystem, with an average T/ET of 39.64%. The dominant factors of T/ET on different time scales were air temperature (Ta) and surface temperature (Ts), which showed significant negative correlations (p < 0.05). ET and its components showed obvious unimodal changes at the hourly scale. The peaks occurred at 12:00-14:00, and they all increased with increasing radiation (Ra), Ts, Ta, and saturated water vapor pressure difference (VPD). Ta was the dominant factor with a correlation coefficient of 0.76, followed by VPD> Ra>Ts. At the daily scale, ET and its components showed clear seasonal changes, ET was 1.94 mm d-1and T was 0.77 mm d-1. The dominant factors were soil moisture content (SWC) of the 0-10 cm soil layer and Ts. The dominant factors affecting ET and its components in the early, middle, and late stages of growth were relative humidity (RH), SWC, and Ts. At the monthly scale, the cumulative values of ET and its components were the largest in August and the lowest in October, mainly regulated by precipitation (P), whereas, T/ET had no significant correlation with P. The results from this study can provide a scientific basis for vegetation restoration and environmental protection in desert grassland ecological function areas.
英文关键词	Desert grassland Time scale effect Evapotranspiration Transpiration Dominant factor
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001001896000001
WOS关键词	PARTITIONING EVAPOTRANSPIRATION ; WATER-USE ; TRANSPIRATION ; GROUNDWATER ; ECOSYSTEMS ; SHRUBLAND ; FLUXES ; CARBON ; MODEL ; RATIO
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395071
推荐引用方式 GB/T 7714	Han, Xin,Zhang, Baozhong,Liu, Tiejun,et al. The effect of time scales on the distribution of evapotranspiration and driving factors in desert grasslands[J],2023,284.
APA	Han, Xin,Zhang, Baozhong,Liu, Tiejun,Wang, Jun,Zhou, Qingyun,&Che, Zheng.(2023).The effect of time scales on the distribution of evapotranspiration and driving factors in desert grasslands.AGRICULTURAL WATER MANAGEMENT,284.
MLA	Han, Xin,et al."The effect of time scales on the distribution of evapotranspiration and driving factors in desert grasslands".AGRICULTURAL WATER MANAGEMENT 284(2023).