干旱区生态环境知识资源中心(Arid): A 3-dimensional model of Pinus edulis and Juniperus monosperma root distributions in New Mexico: implications for soil water dynamics

Arid

DOI	10.1007/s11104-020-04446-y
	A 3-dimensional model of Pinus edulis and Juniperus monosperma root distributions in New Mexico: implications for soil water dynamics
	Schwinning, S.1; Litvak, M. E.2; Packman, W. T.2; Pangle, R. E.2; Fox, A. M.3; Huang, C-W 2; McIntire, C. D.2
通讯作者	Schwinning, S.
来源期刊	PLANT AND SOIL
ISSN	0032-079X
EISSN	1573-5036
出版年	2020
卷号	450 期号:1-2 页码:337-355
英文摘要	Aims (1) To develop a 3D root distribution model for pinon-juniper woodland using only tree species, sizes and locations as input. (2) To interpret a two-year time series of soil moisture relative to root distributions. Methods The study was conducted in a pinon (Pinus edulis (Englem.)) -juniper (Juniperus monosperma (Englem.) Sarg.) woodland in New Mexico. We extracted roots from 720 soil blocks (30 cm x 10 cm x 10 cm) cut from the walls of three 10-m long and 1.5-m deep trenches. Roots were sorted by species and diameter class. Distribution models were developed for the dry weight of roots <= 5 mm in diameter. Soil water content and water potentials were measured in soil profiles under tree cluster and canopy gaps for 2 years, including a protracted dry-down period. Results Pinon had twice the root dry mass of juniper, similar to the ratio of canopy projection areas. Root densities were ca. 50% lower in soils under canopy gaps compared to tree clusters and the species ratio did not significantly differ between clusters and gaps. Pinon root density declined faster with soil depth and distance from the stem compared to juniper. A hard caliche layer at 60-80 cm soil depth had no apparent effect on the already low root density at that depth. Overall, the models explained 66% (pinon) and 54% (juniper) of the spatial variation in root density at the scale of sampled soil blocks. During an 8-month dry period, soil moisture declined faster in regions of higher root density: in shallow soil and under tree clusters. This left a reserve of plant-available soil water in the deep soil under canopy gaps. Conclusions Horizontal variation in root density in these open woodlands is predictable and an important component of the dynamic interactions between plant and soil. Under wet and dry conditions, soil water content is substantially different under tree clusters and canopy gaps.
英文关键词	Ecohydrologic heterogeneity Patch connectivity Root-model Semi-arid woodland Spatial heterogeneity Spatial mosaic
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000525145500001
WOS关键词	CREOSOTEBUSH LARREA-TRIDENTATA ; HYDRAULIC REDISTRIBUTION ; PLANT ; VEGETATION ; WOODLAND ; MOISTURE ; DROUGHT ; CLIMATE ; FOREST ; COMPETITION
WOS类目	Agronomy ; Plant Sciences ; Soil Science
WOS研究方向	Agriculture ; Plant Sciences
来源机构	University of Arizona
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315330
作者单位	1.Texas State Univ, Dept Biol, 601 Univ Dr, San Marcos, TX 78666 USA; 2.Univ New Mexico, Dept Biol, MSC03 2020, Albuquerque, NM 87131 USA; 3.Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ 85721 USA
推荐引用方式 GB/T 7714	Schwinning, S.,Litvak, M. E.,Packman, W. T.,et al. A 3-dimensional model of Pinus edulis and Juniperus monosperma root distributions in New Mexico: implications for soil water dynamics[J]. University of Arizona,2020,450(1-2):337-355.
APA	Schwinning, S..,Litvak, M. E..,Packman, W. T..,Pangle, R. E..,Fox, A. M..,...&McIntire, C. D..(2020).A 3-dimensional model of Pinus edulis and Juniperus monosperma root distributions in New Mexico: implications for soil water dynamics.PLANT AND SOIL,450(1-2),337-355.
MLA	Schwinning, S.,et al."A 3-dimensional model of Pinus edulis and Juniperus monosperma root distributions in New Mexico: implications for soil water dynamics".PLANT AND SOIL 450.1-2(2020):337-355.