干旱区生态环境知识资源中心(Arid): Upper and lower treeline biogeographic patterns in semi-arid pinyon-juniper woodlands

Arid

DOI	10.1111/jbi.13952
	Upper and lower treeline biogeographic patterns in semi-arid pinyon-juniper woodlands
	Garbarino, Matteo; Malandra, Francesco; Dilts, Thomas; Flake, Sam; Montalto, Luigi; Spinsante, Susanna; Weisberg, Peter J.
通讯作者	Garbarino, M
来源期刊	JOURNAL OF BIOGEOGRAPHY
ISSN	0305-0270
EISSN	1365-2699
出版年	2020
卷号	47 期号:12 页码:2634-2644
英文摘要	Aim Upper and lower treelines are particularly exposed to a changing climate. It has been hypothesized that upper treelines are constrained by growing season temperature, whereas lower tree lines are water limited. We expect different causal mechanisms of upper versus lower tree line formation to generate distinct patterns of spatial heterogeneity. Here, we compare dynamics, spatial patterns and shape complexity of upper and lower tree lines of semi-arid pinyon-juniper woodlands. Location Toiyabe Range of the Nevada Great Basin (western US). Taxon Pinus monophyllaTorr. & Frem. andJuniperus osteosperma(Torr.) Methods Within 20 sample plots (10 along the upper and 10 along the lower tree line), we mapped tree canopies through photointerpretation of high-resolution imagery. We performed point pattern analyses to compare the spatial arrangement of trees and used LANDSAT 30-year time series and NDVI to understand the vegetation dynamics of these ecotones. We adopted the surface roughness method to measure tree line shape complexity. Results Lower tree lines were denser and showed a stronger trend of increasing NDVI change over the 1984-2015 period. Trees at the lower tree line were more strongly aggregated than at the upper tree line at spatial scales ranging from 15 to 65 meters. Shape complexity was higher at upper tree lines, expressed by a higher mean surface roughness; however, the spatial structures of upper and lower tree lines were similar. Main conclusions Upper tree line expansion of pinyon-juniper woodlands in the study area has been limited and highly variable, but lower tree line downslope expansion into adjacent shrub steppe vegetation was evident. The expected difference between energy- and water-limited tree lines did not manifest in the observed spatial structures. Differences in tree line shape complexity were not significant, although lower tree lines exhibited less complex shapes, likely because they have been more strongly influenced by anthropogenic factors.
英文关键词	ecotone LANDSAT lower tree line pinyon-juniper PPA tree line shape upper tree line woodland dynamics
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000574694200001
WOS关键词	CLIMATE-CHANGE ; LAND-USE ; SPATIAL-PATTERNS ; FIRE HISTORY ; GREAT-BASIN ; VEGETATION ; MOUNTAINS ; LANDSCAPE ; MORTALITY ; DYNAMICS
WOS类目	Ecology ; Geography, Physical
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326608
作者单位	[Garbarino, Matteo] Univ Torino, Dept DISAFA, Largo Paolo Braccini 2, IT-10095 Grugliasco, TO, Italy; [Malandra, Francesco] Marche Polytech Univ, Dept D3A, Ancona, Italy; [Dilts, Thomas; Flake, Sam; Weisberg, Peter J.] Univ Nevada, Dept Nat Resources & Environm Sci, Reno, NV 89557 USA; [Montalto, Luigi] Marche Polytech Univ, Dept SIMAU, Ancona, Italy; [Spinsante, Susanna] Marche Polytech Univ, Dept DII, Ancona, Italy
推荐引用方式 GB/T 7714	Garbarino, Matteo,Malandra, Francesco,Dilts, Thomas,et al. Upper and lower treeline biogeographic patterns in semi-arid pinyon-juniper woodlands[J],2020,47(12):2634-2644.
APA	Garbarino, Matteo.,Malandra, Francesco.,Dilts, Thomas.,Flake, Sam.,Montalto, Luigi.,...&Weisberg, Peter J..(2020).Upper and lower treeline biogeographic patterns in semi-arid pinyon-juniper woodlands.JOURNAL OF BIOGEOGRAPHY,47(12),2634-2644.
MLA	Garbarino, Matteo,et al."Upper and lower treeline biogeographic patterns in semi-arid pinyon-juniper woodlands".JOURNAL OF BIOGEOGRAPHY 47.12(2020):2634-2644.