干旱区生态环境知识资源中心(Arid): Seasonal patterns in water uptake for Medicago sativa grown along an elevation gradient with shallow groundwater table in Yanchi county of Ningxia, Northwest China

Arid

	Seasonal patterns in water uptake for Medicago sativa grown along an elevation gradient with shallow groundwater table in Yanchi county of Ningxia, Northwest China
	Zhu Lin; Zhang Huili; Gao Xue; Qi Yashu; Xu Xing
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2016
卷号	8 期号:6 页码:921-934
英文摘要	Lucerne(Medicago sativa L.)is a deep-rooted perennial leguminous forage with high evapo-transpiration rate exceeding the annual precipitation in semi-arid areas of Northwest China. Groundwater might be the potential water sources of lucerne in the area with shallow groundwater table. In this study, stable isotopic compositions of oxygen and hydrogen(delta~(18)O and deltaD)of different water sources and xylem sap were analyzed to determine the seasonal(April, June, July and August)and topographic(three slope positions)variations in water sources for lucerne growing in Ningxia eastern semi-arid area adjacent to Mu Us Desert characterized by shallow groundwater table. IsoSource software was used to calculate the probable contribution of different water sources to the total plant water uptake. Stomatal conductance, stem water potential, carbon isotope discrimination(Delta~(13)C)of whole plant were also determined for evaluating the water status of lucerne growing at different slope positions. The results showed that soil water content increased as the elevation decreased. Oxygen compositions of soil water in the 0-40 cm profile fluctuated considerably. Soil water delta~(18)O values in deep profile(>3.5 m)were similar to those in groundwater, implying the recharge of groundwater to this soil layer. Highest water utilization rate from deep soil profile(below 350 cm)was recorded for lucerne grown at the slope position 1(groundwater table depth of 3.5-3.9 m)in April, June and July. The lucernes at slope position 2(groundwater table depth of 5.8-6.4 m)and slope position 3(groundwater table depth 7.1-8.3 m)mostly used water from deep soil layers(below 350 cm)during dry period, and turned to use water from superficial soil layer in wet period. Higher yield, Delta~(13)C value of whole plant and stomatal conductance were observed for lucerne grown at the slope position 1 than those at other slope positions. These results indicated that groundwater is a significant water source for transpiration of lucerne grown in Ningxia semi-arid area with shallow groundwater table where lucerne grassland is suggested to be established so as to obtain better yield performance.
英文关键词	lucerne water uptake groundwater table oxygen and hydrogen isotopic compositions evapo-transpiration
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Agriculture
CSCD记录号	CSCD:5828501
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335718
作者单位	Zhu Lin, Ningxia University, State Key Laboratory Breeding Base of Land Degradation and Ecological Restoration of North-western China;;Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem of North-western China, Ministry of Education, Yinchuan, Ningxia 750021, China.; Xu Xing, Ningxia University, State Key Laboratory Breeding Base of Land Degradation and Ecological Restoration of North-western China;;Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem of North-western China, Ministry of Education, Yinchuan, Ningxia 750021, China.; Zhang Huili, Agricultural College, Ningxia University, Yinchuan, Ningxia 750021, China.; Gao Xue, Agricultural College, Ningxia University, Yinchuan, Ningxia 750021, China.; Qi Yashu, Agricultural College, Ningxia University, Yinchuan, Ningxia 750021, China.
推荐引用方式 GB/T 7714	Zhu Lin,Zhang Huili,Gao Xue,et al. Seasonal patterns in water uptake for Medicago sativa grown along an elevation gradient with shallow groundwater table in Yanchi county of Ningxia, Northwest China[J],2016,8(6):921-934.
APA	Zhu Lin,Zhang Huili,Gao Xue,Qi Yashu,&Xu Xing.(2016).Seasonal patterns in water uptake for Medicago sativa grown along an elevation gradient with shallow groundwater table in Yanchi county of Ningxia, Northwest China.Journal of Arid Land,8(6),921-934.
MLA	Zhu Lin,et al."Seasonal patterns in water uptake for Medicago sativa grown along an elevation gradient with shallow groundwater table in Yanchi county of Ningxia, Northwest China".Journal of Arid Land 8.6(2016):921-934.