干旱区生态环境知识资源中心(Arid): Time scale and influencing factor variations of water and heat fluxes in sandy land

Arid

DOI	10.2166/nh.2022.020
	Time scale and influencing factor variations of water and heat fluxes in sandy land
	Li, Xiaoyuan; Zhang, Shengwei; Liu, Tingxi; Lin, Xi; Li, Ruishen; Wang, Shuai
通讯作者	Zhang, SW
来源期刊	HYDROLOGY RESEARCH
ISSN	1998-9563
EISSN	2224-7955
出版年	2022
卷号	53 期号:7 页码:983-1000
英文摘要	The transfer process and variation characteristics of water and heat fluxes play an important role in both the ecosystem function and the climatic patterns of arid and semi-arid areas. However, both water (latent heat flux, Fe) and heat (sensible heat flux, Fh) fluxes, and the factors impacting each, operate on different time scales. Therefore, the wavelet transformation was used to reconstruct water and heat flux data measured by an eddy covariance system installed in Horqin sandy land, China. The distribution and response regularity of water and heat fluxes in response to control factors were then analysed across different time scales. The results indicated that the responses of Fe and Fh to controlling factors were similar on 30 min and daily scales, to which the energy terms of net radiation (Fn) and available energy (Fa) showed an extremely significant positive contribution. Removing the interference of the energy terms, Fe and Fh are strongly correlated with the vapour pressure deficit (VPD) and air temperature (Ta) at the daily scale. The water conditions of VPD and relative humidity (RH) were the main influencing factors at the monthly scale. At the seasonal scale, Fe was positively correlated with Fa and Fn but negatively correlated with soil heat flux (Fg), RH and wind speed (\NS). On the contrary, Fh was positively correlated with RH but negatively correlated with Fn. At the annual scale, Fe and Fh showed a significant positive correlation with all factors. By the increasing time scale, the cross-correlations between various hydroclimatic processes become better. Generally, at the daily and annual scales, there is a high correlation between Fe, Fh and the control factors, and a pronounced periodicity is exhibited. Another factor that is known to cause such effects is the so-called long-term persistence (or else long-range dependence or the Hurst phenomenon). These results suggest that the time scales of flux and impacting factors should be considered when undertaking water and heat flux analyses of sandy land and other ecosystems.
英文关键词	correlation analysis grassland desertification sandy dune water and heat relationship wavelet transform
类型	Article
语种	英语
开放获取类型	Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000829754200001
WOS关键词	NET ECOSYSTEM EXCHANGE ; INNER-MONGOLIA ; TERRESTRIAL ECOSYSTEMS ; HYDROLOGICAL CYCLE ; WAVELET TRANSFORM ; SPECTRAL-ANALYSIS ; ENERGY-EXCHANGE ; TYPICAL STEPPE ; VAPOR EXCHANGE ; CLIMATE-CHANGE
WOS类目	Water Resources
WOS研究方向	Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/393066
推荐引用方式 GB/T 7714	Li, Xiaoyuan,Zhang, Shengwei,Liu, Tingxi,et al. Time scale and influencing factor variations of water and heat fluxes in sandy land[J],2022,53(7):983-1000.
APA	Li, Xiaoyuan,Zhang, Shengwei,Liu, Tingxi,Lin, Xi,Li, Ruishen,&Wang, Shuai.(2022).Time scale and influencing factor variations of water and heat fluxes in sandy land.HYDROLOGY RESEARCH,53(7),983-1000.
MLA	Li, Xiaoyuan,et al."Time scale and influencing factor variations of water and heat fluxes in sandy land".HYDROLOGY RESEARCH 53.7(2022):983-1000.