干旱区生态环境知识资源中心(Arid): Effect of Drought and Topographic Position on Depth of Soil Water Extraction of Pinus sylvestris L. var. mongolica Litv. Trees in a Semiarid Sandy Region, Northeast China

Arid

DOI	10.3390/f10050370
	Effect of Drought and Topographic Position on Depth of Soil Water Extraction of Pinus sylvestris L. var. mongolica Litv. Trees in a Semiarid Sandy Region, Northeast China
	Song, Lining 1,2,3; Zhu, Jiaojun 1,2,3; Zhang, Jinxin 1,2,3; Zhang, Ting 1,2,3; Wang, Kai 4; Wang, Guochen 5; Liu, Jianhua 5
通讯作者	Zhu, Jiaojun
来源期刊	FORESTS
ISSN	1999-4907
出版年	2019
卷号	10 期号:5
英文摘要	Drought and topographic position are the most important factors influencing tree growth and survival in semiarid sandy regions of Northeast China. However, little is known about how trees respond to drought in combination with topographic position by modifying the depth of soil water extraction. Therefore, we identified water sources for 33-year-old Mongolian pine (Pinus sylvestris L. var. mongolica Litv.) trees growing at the top and bottom of sand dunes by comparing stable isotopes delta H-2 and delta O-18 in twig xylem water, soil water at various depths and groundwater during dry and wet periods. Needle carbon isotope composition (delta C-13) was simultaneously measured to assess water use efficiency. Results showed that when soil moisture was low during the dry period, trees at the top used 40-300 cm soil water while trees at the bottom utilized both 40-300 cm soil water and possibly groundwater. Nevertheless, when soil moisture at 0-100 cm depth was higher during the wet period, it was the dominant water sources for trees at both the top and bottom. Moreover, needle delta C-13 in the dry period were significantly higher than those in the wet period. These findings suggested that trees at both the top and bottom adjust water uptake towards deeper water sources and improve their water use efficiency under drought condition. Additionally, during the dry period, trees at the top used shallower water sources compared with trees at the bottom, in combination with significantly higher needle delta C-13, indicating that trees at the bottom applied a relatively more prodigal use of water by taking up deeper water (possibly groundwater) during drought conditions. Therefore, Mongolian pine trees at the top were more susceptible to suffer dieback under extreme dry years because of shallower soil water uptake and increased water restrictions. Nevertheless, a sharp decline in the groundwater level under extreme dry years had a strong negative impact on the growth and survival of Mongolian pine trees at the bottom due to their utilization of deeper water sources (possibly groundwater).
英文关键词	stable isotopes water sources water use efficiency soil water groundwater
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000478814700010
WOS关键词	ROCKY-MOUNTAIN AREA ; PLANT WATER ; USE EFFICIENCY ; VACUUM EXTRACTION ; STABLE-ISOTOPES ; USE PATTERNS ; DESERT ; TRANSPIRATION ; PLANTATIONS ; VEGETATION
WOS类目	Forestry
WOS研究方向	Forestry
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215697
作者单位	1.Inst Appl Ecol, CAS Key Lab Forest Ecol & Management, Shenyang 110016, Liaoning, Peoples R China; 2.Chinese Acad Sci, Qingyuan Forest CERN, Shenyang 110016, Liaoning, Peoples R China; 3.Liaoning Key Lab Management Noncommercial Forests, Shenyang 110016, Liaoning, Peoples R China; 4.Liaoning Tech Univ, Coll Environm Sci & Engn, Fuxing 123000, Peoples R China; 5.Liaoning Inst Sandy Land Control & Utilizat, Fuxing 123000, Peoples R China
推荐引用方式 GB/T 7714	Song, Lining,Zhu, Jiaojun,Zhang, Jinxin,et al. Effect of Drought and Topographic Position on Depth of Soil Water Extraction of Pinus sylvestris L. var. mongolica Litv. Trees in a Semiarid Sandy Region, Northeast China[J],2019,10(5).
APA	Song, Lining.,Zhu, Jiaojun.,Zhang, Jinxin.,Zhang, Ting.,Wang, Kai.,...&Liu, Jianhua.(2019).Effect of Drought and Topographic Position on Depth of Soil Water Extraction of Pinus sylvestris L. var. mongolica Litv. Trees in a Semiarid Sandy Region, Northeast China.FORESTS,10(5).
MLA	Song, Lining,et al."Effect of Drought and Topographic Position on Depth of Soil Water Extraction of Pinus sylvestris L. var. mongolica Litv. Trees in a Semiarid Sandy Region, Northeast China".FORESTS 10.5(2019).