干旱区生态环境知识资源中心(Arid): Spatial distribution of root systems of Pinus sylvestris var. mongolica trees with different ages in a semi-arid sandy region of Northeast China

Arid

DOI	10.1016/j.foreco.2020.118776
	Spatial distribution of root systems of Pinus sylvestris var. mongolica trees with different ages in a semi-arid sandy region of Northeast China
	Zhang, Ting; Song, Lining; Zhu, Jiaojun; Wang, Guochen; Li, Mingcai; Zheng, Xiao; Zhang, Jinxin
通讯作者	Zhu, JJ (corresponding author), Chinese Acad Sci, Inst Appl Ecol, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
来源期刊	FOREST ECOLOGY AND MANAGEMENT
ISSN	0378-1127
EISSN	1872-7042
出版年	2021
卷号	483
英文摘要	Mongolian pine (Pinus sylvestris var. mongolica), the most important tree species for sand fixation in semi-arid sandy lands, experiences dieback in plantations after approximately 35-40 years since planting. Water limitation was considered as an important cause for the dieback. The spatial distribution of root systems plays a key role in determining water resources used by trees. However, it is still unknown for the spatial distribution of Mongolian pine trees with different ages, which constrains our understanding of the mechanism underlying the dieback and management of Mongolian pine plantations. Horizontal and vertical distributions of coarse roots [root diameter (RD) >= 5 mm] of Mongolian pine trees with 10, 20, 30, 40, 50 years old were estimated by ground-penetrating radar. Meanwhile, the distributions of fine roots (RD <= 2 mm) were simultaneously measured using soil coring method. Results showed that the horizontal distance of coarse roots from trees increased with tree ages up to 30-40 years, i.e., 3.0-4.0 m for 10- and 20-year-old trees, ca. 6.1 m for 30- and 40-year-old trees; but merely 4.85 m for 50-year-old trees. The fine root densities kept relatively even within 4.0 m from the trees for 10- and 20-year-old trees (ca. 0.02 mg cm-3), whereas, they decreased sharply with increasing of distances from the trees for 30-, 40- and 50-year-old trees (0.015-0.025 mg cm(-3) at 1.0 m from trees to ca. 0.00 mg cm(-3) at 5.0 or 6.0 m from trees). In the vertical direction, the rooting depth, at which 95% of roots located, was 83.5, 99.9, 123.6, 105.2 and 125.9 cm for the coarse roots of 10-, 20-, 30-, 40- and 50-year-old trees, respectively, whereas it was 140.6, 152.2, 135.5, 144.2 and 127.0 cm for fine roots, respectively. These findings indicated that the spatial distribution of roots of Mongolian pine trees shrank for the 50-year old trees, possibly due to being close to mature stage in plantation sites. Based on spatial distribution of roots, we suggested that the stand densities should be determined according to the area occupied by tree root systems in order to avoid the dieback or mortality due to water competition, i.e., 403-515, 321-402, 217-290, 139-179 trees ha(-1) for 10-, 20-, 30- and 40-year-old trees, respectively (none for 50-year-old plantations as they were close to mature stage). Our findings provide new insights into stand density optimization of plantations from tree belowground competition for water in semi-arid and arid sandy regions.
英文关键词	Dieback Ground-penetrating radar Coarse root Fine root Stand density
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000617948300001
WOS关键词	GROUND-PENETRATING RADAR ; FINE ROOTS ; STAND AGE ; VERTICAL-DISTRIBUTION ; TURNOVER RATES ; LOESS PLATEAU ; COARSE ROOTS ; SOIL-WATER ; BIOMASS ; FORESTS
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/2XILL650/369000
作者单位	[Zhang, Ting; Song, Lining; Zhu, Jiaojun; Li, Mingcai; Zheng, Xiao; Zhang, Jinxin] Inst Appl Ecol, CAS Key Lab Forest Ecol & Management, Shenyang 110016, Peoples R China; [Zhang, Ting; Song, Lining; Zhu, Jiaojun; Li, Mingcai; Zheng, Xiao; Zhang, Jinxin] Liaoning Key Lab Management Noncommercial Forests, Shenyang 110016, Peoples R China; [Zhang, Ting; Song, Lining; Zhu, Jiaojun; Li, Mingcai; Zheng, Xiao; Zhang, Jinxin] Chinese Acad Sci, Qingyuan Forest CERN, Shenyang 110016, Peoples R China; [Wang, Guochen] Liaoning Inst Sandy Land Control & Utilizat, Fuxing 123000, Peoples R China; [Zhang, Ting; Zhu, Jiaojun] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Ting,Song, Lining,Zhu, Jiaojun,et al. Spatial distribution of root systems of Pinus sylvestris var. mongolica trees with different ages in a semi-arid sandy region of Northeast China[J],2021,483.
APA	Zhang, Ting.,Song, Lining.,Zhu, Jiaojun.,Wang, Guochen.,Li, Mingcai.,...&Zhang, Jinxin.(2021).Spatial distribution of root systems of Pinus sylvestris var. mongolica trees with different ages in a semi-arid sandy region of Northeast China.FOREST ECOLOGY AND MANAGEMENT,483.
MLA	Zhang, Ting,et al."Spatial distribution of root systems of Pinus sylvestris var. mongolica trees with different ages in a semi-arid sandy region of Northeast China".FOREST ECOLOGY AND MANAGEMENT 483(2021).