干旱区生态环境知识资源中心(Arid): Determination of the representative elementary area (REA) of biocrusts: A case study from the Hilly Loess Plateau region, China

Arid

DOI	10.1016/j.geoderma.2021.115502
	Determination of the representative elementary area (REA) of biocrusts: A case study from the Hilly Loess Plateau region, China
	Wang, Shanshan; Liu, Baoyuan; Zhao, Yunge; Gao, Liqian; Yin, Bing; Yang, Kai; Ji, Jingyi
通讯作者	Zhao, YG (corresponding author), Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China.
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2022
卷号	406
英文摘要	Biological soil crusts (biocrusts) are mixed communities of cyanobacteria, lichens and mosses in different ratios, contributing to important ecological functions in arid and semiarid regions worldwide. Biocrusts are spatially variable, and the variability in biocrust composition and coverage is scale-dependent. The following question can then be asked: What is the appropriate spatial scale for observing ecological functions? Without clarifying this issue, we cannot fully understand the ecological functions of biocrusts. The key to answering this question is to determine a threshold area, or representative elementary area (REA). Accordingly, we analyzed red-green-blue (RGB) images of 90 biocrust plots (2.0 m x 2.0 m) from nine revegetated grasslands in the Hilly Loess Plateau region of China. The variability in biocrust composition and coverage across the plot sizes was studied by gradually expanding the plot size from 0.01 m(2) to 4.00 m(2). The results showed that as the plot sizes increased from 0.01 m(2) to 4.00 m(2), the number of biocrust types logarithmically increased. Biocrust patches of a particular type (such as moss, cyanobacteria or lichen) were often characteristic of a plot size of 0.01 m(2), whereas plot sizes larger than 0.25 m(2) supported mixed biocrusts of multiple patch types. The variability in coverage of mixed biocrusts logarithmically decreased with increasing plot sizes. The coverage of mixed biocrusts maintained an approximately constant value after a certain critical plot size was reached (1.00 m(2 )in this study). Our data indicated that REAs of mixed biocrusts exist at the slope scale. The REAs of mixed biocrusts were 0.5-1.0 m(2), 1.5-2.5 m(2) and 3.0-3.8 m(2), with alpha (alpha) values of 0.1, 0.05 and 0.01, respectively. The size of the REAs on the north-facing slope was larger than that on the south-facing slope, and the patch density of biocrusts had an important influence on the REAs. The results of this study could provide a method for determining the REAs of mixed biocrusts and guide surveys and experimental layouts.
英文关键词	Cyanobacteria Moss Spatial heterogeneity Distribution characteristic Mosaic pattern
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000708893700002
WOS关键词	BIOLOGICAL SOIL CRUSTS ; MICROBIAL SPATIAL HETEROGENEITY ; COLORADO NATIONAL MONUMENT ; GLIDING BOX ; COMMUNITY ; PLANT ; INFILTRATION ; DISTURBANCE ; DRYLANDS ; SCALE
WOS类目	Soil Science
WOS研究方向	Agriculture
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363400
作者单位	[Wang, Shanshan; Liu, Baoyuan; Zhao, Yunge; Ji, Jingyi] Chinese Acad Sci & Minist Water Resource, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China; [Liu, Baoyuan; Zhao, Yunge; Gao, Liqian; Yin, Bing] Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China; [Wang, Shanshan; Ji, Jingyi] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Yang, Kai] Northwest A&F Univ, Coll Nat Resource & Environm, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Wang, Shanshan,Liu, Baoyuan,Zhao, Yunge,et al. Determination of the representative elementary area (REA) of biocrusts: A case study from the Hilly Loess Plateau region, China[J]. 西北农林科技大学,2022,406.
APA	Wang, Shanshan.,Liu, Baoyuan.,Zhao, Yunge.,Gao, Liqian.,Yin, Bing.,...&Ji, Jingyi.(2022).Determination of the representative elementary area (REA) of biocrusts: A case study from the Hilly Loess Plateau region, China.GEODERMA,406.
MLA	Wang, Shanshan,et al."Determination of the representative elementary area (REA) of biocrusts: A case study from the Hilly Loess Plateau region, China".GEODERMA 406(2022).