干旱区生态环境知识资源中心(Arid): Modelling the effects of climate change on transpiration and evaporation in natural and constructed grasslands in the semi-arid Loess Plateau, China

Arid

DOI	10.1016/j.agee.2020.107077
	Modelling the effects of climate change on transpiration and evaporation in natural and constructed grasslands in the semi-arid Loess Plateau, China
	Li, Lanjun; Song, Xiaoyu; Xia, Lu; Fu, Na; Feng, Dan; Li, Huaiyou; Li, Yaolin
通讯作者	Song, XY
来源期刊	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
ISSN	0167-8809
EISSN	1873-2305
出版年	2020
卷号	302
英文摘要	Investigating the effects of climate change on transpiration (T) and evaporation (E) in natural and constructed grasslands is of theoretical and practical significance for vegetation restoration and water resource management in the Loess Plateau, China. In this study, a two-year field experiment was conducted in one natural (Imperata cylindrica plot) and two constructed grasslands (Pennisetum giganteum and Medicago sativa plots) in the semi-arid Loess Plateau. Hydrus-1D models were then established and validated to simulate T and E processes under scenarios combining climate characteristics in both future periods and different hydrological years. The results showed that under all climate scenarios, T in the natural grassland, and P. giganteum and M. sativa plots ranged from 63.7-179.3, 126.8-245.5, and 96.9-243.1 mm, respectively, while E ranged from 90.6-131.9, 68.7-92.8, and 70.4-92.4 mm, respectively. Both T and E showed a decreasing trend in the future periods, exhibiting the highest values in wet years and the lowest values in dry years. The effects of climate change on T were greater than that on E in all three grasslands. Of the studied grasslands, T of M. sativa plot exhibited the strongest response, followed by that in the natural grassland and P. giganteum plot. However, E of the natural grassland responded to the strongest degree, followed by that of the P. giganteum and M. sativa plots. Precipitation during the growing-season was the most dominant climatic factor affecting T and E, and was positively linearly related with T and E (P < 0.01) in all three grasslands. The conversion thresholds of precipitation for T-E dominance were 435.8, 149.4, and 253.3 mm for the natural grassland, and P. giganteum and M. sativa plots, respectively. In constructed grasslands, more water was lost through T than through E; hence, the T/ET ratios were high ( > 0.55). In contrast, T was high in the natural grassland only in conditions of sufficient precipitation; hence, the T/ET ratio was relatively lower (around 0.5). Precipitation distribution strongly affected the soil water supply, and the natural grassland was more efficient in maintaining soil water than the constructed grasslands. Our study not only improves our understanding of the hydrological processes and water budget under different grass restoration measures, but also provides valuable guidelines for the management of water resources and the restoration of ecological environment in the Loess Plateau.
英文关键词	Evapotranspiration Climate change Hydrus-1D model Scenario simulation Grassland Ecological susta nability
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000564556600007
WOS关键词	SOIL EVAPORATION ; SPATIAL VARIATIONS ; PARTITIONING EVAPOTRANSPIRATION ; AGRICULTURAL MANAGEMENT ; HYDRAULIC CONDUCTIVITY ; PLANT TRANSPIRATION ; STABLE-ISOTOPES ; WATER-BALANCE ; LAND-COVER ; CROP
WOS类目	Agriculture, Multidisciplinary ; Ecology ; Environmental Sciences
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325922
作者单位	[Li, Lanjun; Song, Xiaoyu; Xia, Lu; Fu, Na] Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Shaanxi, Peoples R China; [Feng, Dan] Lantian Water Conservancy & Soil & Water Conserva, Xian 710500, Shaanxi, Peoples R China; [Li, Huaiyou; Li, Yaolin] Yellow River Conservancy Comm, Xifeng Expt Stn Soil & Water Conservat, Qingyang 745000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Li, Lanjun,Song, Xiaoyu,Xia, Lu,et al. Modelling the effects of climate change on transpiration and evaporation in natural and constructed grasslands in the semi-arid Loess Plateau, China[J],2020,302.
APA	Li, Lanjun.,Song, Xiaoyu.,Xia, Lu.,Fu, Na.,Feng, Dan.,...&Li, Yaolin.(2020).Modelling the effects of climate change on transpiration and evaporation in natural and constructed grasslands in the semi-arid Loess Plateau, China.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,302.
MLA	Li, Lanjun,et al."Modelling the effects of climate change on transpiration and evaporation in natural and constructed grasslands in the semi-arid Loess Plateau, China".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 302(2020).