干旱区生态环境知识资源中心(Arid): Spatiotemporal variations of soil water stable isotopes in a small karst sinkhole basin

Arid

DOI	10.1007/s12665-020-09284-w
	Spatiotemporal variations of soil water stable isotopes in a small karst sinkhole basin
	Zhang, Tao; Li, Jianhong; Pu, Junbing; Huo, Weijie; Wang, Sainan
通讯作者	Pu, JB (corresponding author), Chinese Acad Geol Sci, MNR, Key Lab Karst Dynam, 50 Qixing Ave, Qixing Dist 541004, Guilin, Peoples R China. ; Pu, JB (corresponding author), Chinese Acad Geol Sci, Guangxi Inst Karst Geol, 50 Qixing Ave, Qixing Dist 541004, Guilin, Peoples R China.
来源期刊	ENVIRONMENTAL EARTH SCIENCES
ISSN	1866-6280
EISSN	1866-6299
出版年	2021
卷号	80 期号:1
英文摘要	Soil water plays an important role in the ecological restoration of karst areas impacted by rocky desertification (KRD) caused by deforestation. A better understanding of the spatiotemporal dynamics and modes of water flow in KRD areas is essential for satisfactory soil water management. This study examines the soil water content (SWC) and stable isotope (delta O-18 and delta D) patterns in seven sampling sites along an E-W transect in a typical small karst basin in southwest China over the hydrologic year, February, 2018-January, 2019. The results of this study show that the spatial differences of SWC and soil water delta O-18 (delta D) values were smaller but in with clear seasonal variations. Seasonal vertical profiles of soil water delta O-18 (delta D) showed a decreasing trend from the surface to a depth of 100 cm in February, April, and June, which reversed August and October. Shallow soil water delta O-18 (delta D) and line-conditioned excess (lc-excess) (<20 cm depth) showed significantly stronger seasonality than the deeper soil water (>20 cm depth). Enriched soil water delta O-18 (delta D) values in the upper 20 cm depth was closely related to the potential evaporation over the 7 days prior to each sampling (PET7). Piston flow was the dominant mode of flow in the sampling sites, inferred from the vertical profile characteristics of the soil water delta O-18 (delta D). The influence of evaporative processes was limited to the upper 20 cm depth of the soil. The fraction of evaporation losses from soil water storage at the 20 cm depth varied from - 15.8% to 12.3%, based on delta D estimates, and from - 13.3% to 14.0% based on delta O-18. These results are important for effective soil water management in KRD areas that experience seasonal drought.
英文关键词	Soil water Stable isotope Water movement mechanism Evaporation loss Karst rocky desertification
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000608032000001
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347847
作者单位	[Zhang, Tao; Li, Jianhong; Pu, Junbing; Huo, Weijie; Wang, Sainan] Chinese Acad Geol Sci, MNR, Key Lab Karst Dynam, 50 Qixing Ave, Qixing Dist 541004, Guilin, Peoples R China; [Zhang, Tao; Li, Jianhong; Pu, Junbing; Huo, Weijie; Wang, Sainan] Chinese Acad Geol Sci, Guangxi Inst Karst Geol, 50 Qixing Ave, Qixing Dist 541004, Guilin, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Tao,Li, Jianhong,Pu, Junbing,et al. Spatiotemporal variations of soil water stable isotopes in a small karst sinkhole basin[J],2021,80(1).
APA	Zhang, Tao,Li, Jianhong,Pu, Junbing,Huo, Weijie,&Wang, Sainan.(2021).Spatiotemporal variations of soil water stable isotopes in a small karst sinkhole basin.ENVIRONMENTAL EARTH SCIENCES,80(1).
MLA	Zhang, Tao,et al."Spatiotemporal variations of soil water stable isotopes in a small karst sinkhole basin".ENVIRONMENTAL EARTH SCIENCES 80.1(2021).