Seasonal dynamics and controls of deep soil water infiltration in the seasonally-frozen region of the Qinghai-Tibet plateau

NWIPB OpenIR

	Seasonal dynamics and controls of deep soil water infiltration in the seasonally-frozen region of the Qinghai-Tibet plateau
	Dai, Licong; Guo, Xiaowei; Zhang, Fawei; Du, Yangong; Ke, Xun; Li, Yikang; Cao, Guangmin; Li, Qian; Lin, Li; Shu, Kai; Peng, Cuoji
	2019
发表期刊	JOURNAL OF HYDROLOGY
卷号	571
摘要	Deep soil water infiltration is a key hydrological process in seasonally frozen regions, and displays a distinct behavior from that in other unfrozen regions; however, the seasonal dynamics and key controls of deep soil water infiltration in the seasonally frozen region of the Qinghai-Tibet plateau (QTP) are still poorly understood. In this study, we examine the seasonal dynamics of deep soil water infiltration, and attempt to quantitatively assess the relative influences of several driving factors by applying a random forests statistical analysis. The following key results were obtained. Deep soil water infiltration shows marked seasonal variation. Rainfall intensity exerts little effect on the seasonal dynamics of deep soil water infiltration as almost all rainfall returns to the atmosphere via evapotranspiration. No infiltration occurred when the depth of lower layer frozen soil reached 29 cm, whereas deep infiltration increased during the thawing of soil frost, suggesting that deep infiltration is impeded by soil freezing. Overall, the observed seasonal dynamics of deep soil water infiltration and volumetric soil moisture content were similar during the freeze-thaw process. Furthermore, deep soil water infiltration was more strongly influenced by deep volumetric soil moisture than by shallower volumetric soil moisture. Our results suggest that the topsoil Mattic Epipedon, soil organic matter content, and root systems' role in vertical moisture movement should be taken into consideration when modeling hydrological processes in alpine meadows.
关键词	Deep soil water infiltration Qinghai-Tibet plateau Seasonally frozen Random forests Mattic Epipedon
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/59826
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Dai, Licong,Guo, Xiaowei,Zhang, Fawei,et al. Seasonal dynamics and controls of deep soil water infiltration in the seasonally-frozen region of the Qinghai-Tibet plateau[J]. JOURNAL OF HYDROLOGY,2019,571.
APA	Dai, Licong.,Guo, Xiaowei.,Zhang, Fawei.,Du, Yangong.,Ke, Xun.,...&Peng, Cuoji.(2019).Seasonal dynamics and controls of deep soil water infiltration in the seasonally-frozen region of the Qinghai-Tibet plateau.JOURNAL OF HYDROLOGY,571.
MLA	Dai, Licong,et al."Seasonal dynamics and controls of deep soil water infiltration in the seasonally-frozen region of the Qinghai-Tibet plateau".JOURNAL OF HYDROLOGY 571(2019).