干旱区生态环境知识资源中心(Arid): Environmental and Biophysical Effects of the Bowen Ratio over Typical Farmland Ecosystems in the Loess Plateau

Arid

DOI	10.3390/rs14081897
	Environmental and Biophysical Effects of the Bowen Ratio over Typical Farmland Ecosystems in the Loess Plateau
	Ren, Xueyuan; Zhang, Qiang; Yue, Ping; Yang, Jinhu; Wang, Sheng
通讯作者	Yue, P
来源期刊	REMOTE SENSING
EISSN	2072-4292
出版年	2022
卷号	14 期号:8
英文摘要	The Bowen ratio (beta) comprehensively reflects physical characteristics of the land-surface climate. In this study, eddy covariance systems installed at Dingxi and Qingyang were used to conduct energy distribution measurements and observations characteristic of semi-arid and semi-humid farmland ecosystems on the China Loess Plateau. We studied mechanisms by which eco-environmental factors influence beta. Additionally, we investigated responses of physiological and ecological factors to water and heat exchange under seasonally dry and wet conditions within each farmland ecosystem. Our results showed that sensible heat flux in the semi-arid farmland was the main consumer of available energy. In the semi-humid area, latent heat flux in summer had the dominant role in energy distribution (mean beta 0.71). The beta in the semi-arid region was 1.5 times higher than that in the semi-humid region during the growing season. beta increased with an increase in the vapor pressure deficit (VPD) and ground-air temperature difference (Ts - Ta), and decreased significantly with an increase in effective precipitation and soil moisture. The change in beta with environmental factors was more clear-cut in semi-arid areas than in semi-humid areas. The Priestley-Taylor coefficient (alpha) and beta satisfied a power function law in the growing season. There was a strong correlation between them, with the coefficients of determination for semi-humid and semi-arid areas being 0.62 and 0.72, respectively. beta decreased with an increase in the normalized difference vegetative index (NDVI), with this phenomenon being more obvious in the semi-humid zone (R-2 = 0.40). beta responded more rapidly to NDVI in the semi-arid area than in the semi-humid area. There was a negative exponential relationship between canopy stomatal conductance (Gs) and beta, which displayed a stronger declining trend with the increase in Gs in the semi-arid area than in the semi-humid area. This study provides an important reference for the determination of land-surface characteristics of semi-arid and semi-humid farmland ecosystems on the Loess Plateau and for improving parameterization of land-surface processes.
英文关键词	Loess Plateau farmland ecosystem physiological and ecological factors Bowen ratio
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000787395900001
WOS关键词	ENERGY-BALANCE CLOSURE ; SOIL HEAT-FLUX ; CANOPY CONDUCTANCE ; SEMIARID GRASSLAND ; INTERANNUAL VARIABILITY ; CARBON-DIOXIDE ; CLIMATE-CHANGE ; WATER ; MODEL ; EVAPOTRANSPIRATION
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/394132
推荐引用方式 GB/T 7714	Ren, Xueyuan,Zhang, Qiang,Yue, Ping,et al. Environmental and Biophysical Effects of the Bowen Ratio over Typical Farmland Ecosystems in the Loess Plateau[J],2022,14(8).
APA	Ren, Xueyuan,Zhang, Qiang,Yue, Ping,Yang, Jinhu,&Wang, Sheng.(2022).Environmental and Biophysical Effects of the Bowen Ratio over Typical Farmland Ecosystems in the Loess Plateau.REMOTE SENSING,14(8).
MLA	Ren, Xueyuan,et al."Environmental and Biophysical Effects of the Bowen Ratio over Typical Farmland Ecosystems in the Loess Plateau".REMOTE SENSING 14.8(2022).