干旱区生态环境知识资源中心(Arid): Effects of human-induced land degradation on water and carbon fluxes in two different Brazilian dryland soil covers

Arid

DOI	10.1016/j.scitotenv.2021.148458
	Effects of human-induced land degradation on water and carbon fluxes in two different Brazilian dryland soil covers
	de Oliveira, Michele L.; dos Santos, Carlos A. C.; de Oliveira, Gabriel; Perez-Marin, Aldrin M.; Santos, Celso A. G.
通讯作者	dos Santos, CAC (corresponding author), Univ Fed Campina Grande, Grad Program Engn & Nat Resources Management, BR-58109970 Campina Grande, Paraiba, Brazil.
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2021
卷号	792
英文摘要	The Brazilian semiarid region presents a physical water scarcity and high seasonal and interannual irregularities of precipitation, known as a region with periodic droughts. This region is mainly covered by the Caatinga biome, recognized as a Seasonally Dry Tropical Forest (SDTF). Soil water availability directly impacts the ecosystem's functioning, characterized by low fertility and sparse vegetation cover during the dry season, making it a fragile ecosystem vulnerable to climatic variations. Additionally, this region has been suffering from several issues due to human activities over the centuries, which has resulted in extensive areas being severely degraded, which aggravates the impacts from climatic variations and the susceptibility to desertification. Thus, studying the soil-plantatmosphere continuum in this region can help better understand the seasonal and annual behavior of the water and carbon fluxes. This study investigated the dynamics of water and carbon fluxes during four years (2013-2016) by using eddy covariance (EC) measurements within two areas of Caatinga (dense Caatinga (DC) and sparse Caatinga (SC)) that suffered anthropic pressures. The two study areas showed similar behavior in relation to physical parameters (air temperature, incoming radiation, vapor pressure deficit, and relative humidity), except for soil temperature. The SC area presented a surface temperature of 3 degrees C higher than the DC, related to their vegetation cover differences. The SC area had higher annual evapotranspiration, representing 74% of the precipitation for the DC area and 90% for the SC area. The two areas acted as a carbon sink during the study period, with the SC area showing a lower CO2 absorption capacity. On average, the DC area absorbs 2.5 times more carbon than the SC area, indicating that Caatinga deforestation affects evaporative fluxes, reducing atmospheric carbon fixation and influencing the ability to mitigate the effects of increased greenhouse gas concentrations in the atmosphere. (c) 2021 Elsevier B.V. All rights reserved.
英文关键词	Eddy covariance Monitoring Soil-plant-atmosphere continuum Caatinga
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000689491000008
WOS关键词	GROSS PRIMARY PRODUCTION ; ECOSYSTEM RESPIRATION ; USE EFFICIENCY ; CAATINGA ; ENERGY ; EVAPOTRANSPIRATION ; VARIABILITY ; EXCHANGE ; DIOXIDE ; GRASSLAND
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364575
作者单位	[de Oliveira, Michele L.; dos Santos, Carlos A. C.] Univ Fed Campina Grande, Grad Program Engn & Nat Resources Management, BR-58109970 Campina Grande, Paraiba, Brazil; [dos Santos, Carlos A. C.] Univ Fed Campina Grande, Acad Unit Atmospher Sci, BR-58109970 Campina Grande, Paraiba, Brazil; [de Oliveira, Gabriel] Univ S Alabama, Dept Earth Sci, Mobile, AL 36688 USA; [Perez-Marin, Aldrin M.] Natl Inst Semi Arid, BR-58434700 Campina Grande, Paraiba, Brazil; [Santos, Celso A. G.] Univ Fed Paraiba, Dept Civil & Environm Engn, BR-58051900 Joao Pessoa, Paraiba, Brazil
推荐引用方式 GB/T 7714	de Oliveira, Michele L.,dos Santos, Carlos A. C.,de Oliveira, Gabriel,et al. Effects of human-induced land degradation on water and carbon fluxes in two different Brazilian dryland soil covers[J],2021,792.
APA	de Oliveira, Michele L.,dos Santos, Carlos A. C.,de Oliveira, Gabriel,Perez-Marin, Aldrin M.,&Santos, Celso A. G..(2021).Effects of human-induced land degradation on water and carbon fluxes in two different Brazilian dryland soil covers.SCIENCE OF THE TOTAL ENVIRONMENT,792.
MLA	de Oliveira, Michele L.,et al."Effects of human-induced land degradation on water and carbon fluxes in two different Brazilian dryland soil covers".SCIENCE OF THE TOTAL ENVIRONMENT 792(2021).