Investigating Spectral Characteristics and Spatial Variability of Dissolved Organic Matter Leached from Wetland in Semi-Arid Region to Differentiate Its Sources and Fate

2013 ◽  
Vol 42 (8) ◽  
pp. 1076-1082 ◽  
Author(s):  
Xu-Jing Guo ◽  
Qiang Li ◽  
Jin-Yuan Jiang ◽  
Ben-Lin Dai
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Spatial Variability ◽  
Arid Region ◽  
Spectral Characteristics ◽  
Semi Arid Region ◽  
Semi Arid

WATER TABLE DEPTH SPATIAL VARIABILITY IN AN ALLUVIAL SOIL OF THE SEMI-ARID REGION OF BRAZIL

2001 ◽  
Author(s):  
Maria Sallydelândia Sobral de Farias ◽  
Vera Lúcia Antunes de Lima ◽  
Tumkur Rajaro Gopinath ◽  
José Dantas Neto ◽  
Carlos Alberto Vieira de Azevedo
Keyword(s):  
Spatial Variability ◽  
Water Table ◽  
Arid Region ◽  
Alluvial Soil ◽  
Water Table Depth ◽  
Semi Arid Region ◽  
Semi Arid

scholarly journals Chemical and structural characterization of soil humic substances under agroforestry and conventional systems

2011 ◽  
Vol 35 (5) ◽  
pp. 1597-1608 ◽  
Author(s):  
Gislane M. de Moraes ◽  
Francisco Alisson da Silva Xavier ◽  
Eduardo de Sá Mendonça ◽  
João Ambrósio de Araújo Filho ◽  
Teógenes Senna de Oliveira
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Humic Substances ◽  
Humic Acids ◽  
Arid Region ◽  
Fulvic Acids ◽  
Native Forest ◽  
Aromatic Character ◽  
Semi Arid Region ◽  
Semi Arid

Studies have proven that the agroforestry systems in the semi-arid region of the State of Ceará, Brazil, induce an increase in soil organic C levels. Notwithstanding, there is no information if this increase also results in qualitative changes in different pools of soil organic matter. The objective of this study was to verify the possible chemical and structural alterations in fulvic and humic acids of a Luvisol in areas adopting agroforestry, traditional intensive cultivation and native forest in a long-term experiment conducted in the semi-arid region of Ceará State, Brazil. The study was conducted in an experimental area of the National Goat Research Center (Embrapa) in Sobral, CE. The following treatments were evaluated: agrosilvopasture (AGP), silvopasture (SILV), intensive cultivation under fallow (ICF), and areas with native forest (NF). Soil fulvic and humic acids fractions were extracted from the 0-6 and 6-12 cm layers and characterized by elemental composition, thermogravimetry and infrared spectroscopy analyses. The elemental composition analysis of humic acids confirmed the data found for fulvic acids, showing reduction in the C, H and N levels, followed by an increase in O contents in the AGP and ICF treatments over SILV and NF. In all treatments, except to SILV in the 0-6 cm layer, the percentage of mass loss was highest (300-600 °C) for humic acids in the thermally most stable region. Despite the similarity between infrared spectra, soil fulvic acids in the SILV treatment extracted from 6-12 cm depth decrease the absorption bands at 1708 and 1408 cm-1 followed by an increase in the absorption band at 1608 cm-1 attributed to aromatic C=C groups. This behavior suggests an increase in the aromatic character of the structure. The AGP and ICF treatments, which increase the soil tilling, favored the maintenance of humic substances with a more aromatic character in the soil than SILV and NF. The less aromatic humic substances in the SILV treatment resulted in an increase of exchange sites of soil organic matter, indicating improved nutrient cycling and maintenance of productivity in the system.

Field-scale spatial variability of soil calcium in a semi-arid region: Implications for soil erosion and site-specific management

Pedosphere ◽  
2021 ◽  
Vol 31 (5) ◽  
pp. 705-714
Author(s):  
Yazhou SUN ◽  
Wenxuan GUO ◽  
David C. WEINDORF ◽  
Fujun SUN ◽  
Sanjit DEB ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Spatial Variability ◽  
Arid Region ◽  
Field Scale ◽  
Site Specific ◽  
Soil Calcium ◽  
Semi Arid Region ◽  
Semi Arid ◽  
Specific Management

scholarly journals Spatial Variability of Physical Attributes of Soil in Cultivated Area with Forage Palm Resistant to Carmine Cochineal in the Northeastern Semi-arid Region

2019 ◽  
Vol 42 (4) ◽  
pp. 39-45
Author(s):  
M. V. SILVA ◽  
G. L. P. ALMEIDA ◽  
P. H. D. BATISTA ◽  
H. PANDORFI ◽  
G. A. P. A. MACÊDO ◽  
...  
Keyword(s):  
Spatial Variability ◽  
Arid Region ◽  
Physical Attributes ◽  
Semi Arid Region ◽  
Semi Arid

Organic matter and phosphorus fractions in irrigated agroecosystems in a semi-arid region of Northeastern Brazil

2010 ◽  
Vol 138 (1-2) ◽  
pp. 74-82 ◽  
Author(s):  
Cristiane Pereira de Assis ◽  
Teógenes Senna de Oliveira ◽  
Joana d’Arc da Nóbrega Dantas ◽  
Eduardo de Sá Mendonça
Keyword(s):  
Organic Matter ◽  
Arid Region ◽  
Phosphorus Fractions ◽  
Northeastern Brazil ◽  
Semi Arid Region ◽  
Semi Arid

Temporal and spectral characteristics of aerosol optical depths in a semi-arid region of southern India

2009 ◽  
Vol 407 (8) ◽  
pp. 2673-2688 ◽  
Author(s):  
K. Raghavendra Kumar ◽  
K. Narasimhulu ◽  
R.R. Reddy ◽  
K. Rama Gopal ◽  
L. Siva Sankara Reddy ◽  
...  
Keyword(s):  
Arid Region ◽  
Spectral Characteristics ◽  
Southern India ◽  
Semi Arid Region ◽  
Semi Arid

scholarly journals Diversidade da dipterofauna necrófaga associada a diferentes matérias orgânicas em decomposição em dois tipos vegetacionais do semiárido pernambucano

2017 ◽  
Vol 10 (3) ◽  
pp. 155-161
Author(s):  
Daniel Luís Viana Cruz ◽  
Aline Freitas Spíndola ◽  
Fernanda Larisse dos Santos Lima ◽  
Plínio Pereira Gomes Junior
Keyword(s):  
Organic Matter ◽  
Urban Area ◽  
Rural Area ◽  
Rainy Season ◽  
Arid Region ◽  
Spatiotemporal Distribution ◽  
Vegetation Types ◽  
Different Types ◽  
Semi Arid Region ◽  
Semi Arid

Resumo. No semiárido, poucos são os estudos que abordam a dipterofauna necrófaga. Assim, o presente trabalho teve por objetivo realizar um levantamento da fauna de dípteros necrófagos e avaliar sua distribuição espaço-temporal em diferentes localidades dos municípios de Serra Talhada/PE e Triunfo/PE. Foram realizadas coletas, ao longo do período de setembro de 2013 (estação seca) e abril de 2014 (estação chuvosa), com auxilio de armadilhas aéreas contendo três tipos de iscas diferentes (peixe, frango e carne bovina) em quatro pontos de coletas, três em Serra Talhada (área rural, área urbana e lixão) e um em Triunfo (área rural). A partir de 1.215 indivíduos coletados foram identificadas 12 espécies distribuídas entre as famílias Calliphoridae, Muscidae, Fanniidae, Phoridae, Piophilidae, Stratiomyidae, Sarcophagidae, Tephritidae e Ulidiidae.Necrophagous dipterofauna diversity associated to different types of organic matter decomposed in two vegetation types of the semi-arid PernambucoAbstract. In the semi-arid region, there are few studies that address the necrophagous dipterofauna. Then, this study aimed to carry out a survey the fauna of necrophagous insects of Diptera order and assess its spatiotemporal distribution in different locations in the municipalities of Serra Talhada/PE and Triunfo PE. The insects have been collected during the September 2013 (dry season) and April 2014 (rainy season), using air traps with three different types of bait (fish, chicken and beef) in four collection points, three in Serra Talhada (rural area, urban area and dump city) and Triunfo (rural area). From 1,215 individuals collected were identified 12 species distributed among the families Calliphoridae, Muscidae, Fanniidae, Phoridae, Piophilidae, Stratiomyidae, Sarcophagidae, Tephritidae and Ulidiidae.

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