Toxicity of imidacloprid to collembolans in two tropical soils under different soil moisture

2020 ◽  
Vol 49 (6) ◽  
pp. 1491-1501
Author(s):  
Thuanne Braúlio Hennig ◽  
Felipe Ogliari Bandeira ◽  
Adriano Junior Dalpasquale ◽  
Elke Jurandy Bran Nogueira Cardoso ◽  
Dilmar Baretta ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Tropical Soils

scholarly journals Improved Calibration Functions of Three Capacitance Probes for the Measurement of Soil Moisture in Tropical Soils

Sensors ◽  
2011 ◽  
Vol 11 (5) ◽  
pp. 4858-4874 ◽  
Author(s):  
Ali Fares ◽  
Farhat Abbas ◽  
Domingos Maria ◽  
Alan Mair
Keyword(s):  
Soil Moisture ◽  
Tropical Soils

Toxicity of fipronil to Folsomia candida in contrasting tropical soils and soil moisture contents: effects on the reproduction and growth

Ecotoxicology ◽  
2021 ◽  
Author(s):  
Thuanne Braúlio Hennig ◽  
Paulo Roger Lopes Alves ◽  
Tânia Toniolo ◽  
Felipe Ogliari Bandeira ◽  
William Eduardo dos Santos ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Tropical Soils ◽  
Folsomia Candida ◽  
Moisture Contents

The Influence of Soil Moisture on Oxide Determination in Tropical Soils via Portable X-ray Fluorescence

2018 ◽  
Vol 82 (3) ◽  
pp. 632-644 ◽  
Author(s):  
Bruno Teixeira Ribeiro ◽  
David C. Weindorf ◽  
Bruno Montoani Silva ◽  
Diego Tassinari ◽  
Larissa Carvalho Amarante ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Tropical Soils ◽  
X Ray

scholarly journals Role of Climatic Factors In The Toxicity of Fipronil Toward Earthworms In Two Tropical Soils: Effects of Increased Temperature And Reduced Soil Moisture Content

2021 ◽  
Author(s):  
Thuanne Braúlio Hennig ◽  
Paulo Roger Lopes Alves ◽  
Felipe Ogliari Bandeira ◽  
Liziara da Costa Cabrera ◽  
Jonas Simon Dugatto ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Soil Moisture Content ◽  
Climatic Factors ◽  
Hazard Quotient ◽  
Tropical Soils ◽  
Effect Of Temperature ◽  
Water Holding ◽  
Water Contents

Abstract The aim of this study was to assess the effect of temperature on the toxicity of fipronil toward earthworms (Eisenia andrei) in two Brazilian soils (Entisol and Oxisol) with contrasting textures. In the case of Entisol, the influence of the soil moisture content on the toxicity was also investigated. Earthworms were exposed for 56 days to soils spiked with increasing concentrations of fipronil under scenarios with different combinations of temperature (20, 25 and 27 ºC) and soil moisture content (60 and 30% of water holding capacity (WHC) for Entisol and 60% WHC for Oxisol). The number of juveniles produced was taken as the endpoint and a risk assessment was performed based on the hazard quotient (HQ). In Entisol, at 60% WHC the fipronil toxicity decreased at 27 ºC compared with the other temperatures tested (EC50 = 52.58, 48.48 and 110 mg kg-1 for 20, 25 and 27 ºC, respectively). In the case of Oxisol at 60% WHC, the fipronil toxicity increased at 27 ºC compared with other temperatures (EC50 = 277.57, 312.87 and 39.89 mg kg-1 at 20, 25 and 27 ºC, respectively). An increase in fipronil toxicity was also observed with a decrease in soil moisture content in Entisol at 27 ºC (EC50 = 27.95 and 110 mg kg-1 for 30% and 60% WHC, respectively). The risk of fipronil was only significant at 27 ºC in Entisol and Oxisol with water contents of 30% and 60% WHC, respectively, revealing that higher temperatures can increase the risk of fipronil toxicity toward earthworms. The results reported herein show that soil properties associated with climatic shifts could enhance the ecotoxicological effects and risk of fipronil for earthworms, depending on the type of soil.

scholarly journals CO2 flux emissions from Atlantic Rainforest soil: determining the most suitable sampling time

2020 ◽  
Vol 42 ◽  
pp. e20
Author(s):  
Edney Leandro da Vitória ◽  
Carla Da Penha Simon ◽  
Ivoney Gontijo ◽  
Ismael Lourenço de Jesus Freitas ◽  
Paulo Roberto Rocha Junior
Keyword(s):  
Soil Moisture ◽  
Soil Temperature ◽  
Co2 Emissions ◽  
Co2 Emission ◽  
Co2 Flux ◽  
Tropical Soils ◽  
Time Of Day ◽  
Sampling Time ◽  
Forest Fragment ◽  
Close Relationship

Few studies have established protocols for measuring CO2 emissions in the soil. In order to determine the time of day which best represents the average daily CO2 emissions, the present study evaluated the variations in CO2 emissions throughout the day and the relationship between these emissions and the soil moisture and temperature, in an attempt to standardize data collection in tropical soils. The study was carried out in an Atlantic forest fragment of the coastal tablelands, Brazil. A close relationship between CO2 emission and soil temperature was observed, with CO2 emissions decreasing as daytime temperatures increased. The soil moisture had no direct relation with the CO2 emission, but was only related to the soil temperature. Two groups of CO2 emissions were observed, forming between the sampling time from 09:00 a.m. to 10:00 p.m., and from 11:00 p.m. to 08:00 a.m. Due to the small difference found between the mean group formed between 09:00 a.m. and 10:00 p.m., which was ~ 8% when compared to the general average, and also the fact that CO2 is easier to collect during this time, it is suggested that this period is the most suitable time to collect CO2 in the field.

scholarly journals Distribution of tetraether lipids in agricultural soils – differentiation between paddy and upland management

2015 ◽  
Vol 12 (20) ◽  
pp. 16709-16754 ◽  
Author(s):  
C. Mueller-Niggemann ◽  
S. R. Utami ◽  
A. Marxen ◽  
K. Mangelsdorf ◽  
T. Bauersachs ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Paddy Soil ◽  
Agricultural Soils ◽  
Methanogenic Archaea ◽  
Tropical Soils ◽  
Potential Effect ◽  
Paddy Soils ◽  
Cultivated Plants ◽  
Alkaline Soils ◽  
Upland Soils

Abstract. Insufficient knowledge of the composition and variation of isoprenoid and branched glycerol dialkyl glycerol tetraethers (GDGTs) in agricultural soils exists, despite of the potential effect of different management types (e.g. soil/water and redox conditions, cultivated plants) on GDGT distribution. Here, we determined the influence of different soil management types on the GDGT composition in paddy (flooded) and adjacent upland (non-flooded) soils, and if available also forest, bushland and marsh soils. To compare the local effects on GDGT distribution patterns, we collected comparable soil samples in various locations from tropical (Indonesia, Vietnam and Philippines) and subtropical (China and Italy) sites. We found that differences in the distribution of isoprenoid GDGTs (iGDGTs) as well as of branched GDGTs (brGDGTs) are predominantly controlled by management type and only secondarily by climatic exposition. In general upland soil had higher crenarchaeol contents than paddy soil, which on the contrary was more enriched in GDGT-0. The GDGT-0 / crenarchaeol ratio was 3–27 times higher in paddy soil and indicates the enhanced presence of methanogenic archaea, which were additionally linked to the number of rice cultivation cycles per year (higher number of cycles was coupled with an increase in the ratio). The TEX86 values were 1.3 times higher in upland, bushland and forest soils than in paddy soils. In all soils brGDGT predominated over iGDGTs, with the relative abundance of brGDGTs increasing from subtropical to tropical soils. Higher BIT values in paddy soils compared to upland soils together with higher BIT values in soil from subtropical climates indicate effects on the amounts of brGDGT through differences in management as well as climatic zones. In acidic soil CBT values correlated well with soil pH. In neutral to alkaline soils, however, no apparent correlation but an offset between paddy and upland managed soils was detected, which may suggest that soil moisture may exert an additional control on the CBT in these soils. Lower MBT' values and calculated temperatures (TMC) in paddy soils compared to upland soils may indicate a management (e.g. enhanced soil moisture through flooding practises) induced effect on mean annual soil temperature (MST).

Imazaquin mobility in tropical soils in relation to soil moisture and rainfall timing

Weed Research ◽  
2002 ◽  
Vol 42 (4) ◽  
pp. 271-279 ◽  
Author(s):  
J B Regitano ◽  
F Prata ◽  
W S D Rocha ◽  
V L Tornisielo ◽  
A Lavorenti
Keyword(s):  
Soil Moisture ◽  
Tropical Soils

scholarly journals Distribution of tetraether lipids in agricultural soils – differentiation between paddy and upland management

2016 ◽  
Vol 13 (5) ◽  
pp. 1647-1666 ◽  
Author(s):  
Cornelia Mueller-Niggemann ◽  
Sri Rahayu Utami ◽  
Anika Marxen ◽  
Kai Mangelsdorf ◽  
Thorsten Bauersachs ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Soil Temperature ◽  
Agricultural Soils ◽  
Methanogenic Archaea ◽  
Tropical Soils ◽  
Paddy Soils ◽  
Cultivated Plants ◽  
Alkaline Soils ◽  
Rice Paddies ◽  
Upland Soils

Abstract. Rice paddies constitute almost a fifth of global cropland and provide more than half of the world's population with staple food. At the same time, they are a major source of methane and therewith significantly contribute to the current warming of Earth's atmosphere. Despite their apparent importance in the cycling of carbon and other elements, however, the microorganisms thriving in rice paddies are insufficiently characterized with respect to their biomolecules. Hardly any information exists on human-induced alteration of biomolecules from natural microbial communities in paddy soils through varying management types (affecting, e.g., soil or water redox conditions, cultivated plants). Here, we determined the influence of different land use types on the distribution of glycerol dialkyl glycerol tetraethers (GDGTs), which serve as molecular indicators for microbial community structures, in rice paddy (periodically flooded) and adjacent upland (non-flooded) soils and, for further comparison, forest, bushland and marsh soils. To differentiate local effects on GDGT distribution patterns, we collected soil samples in locations from tropical (Indonesia, Vietnam and Philippines) and subtropical (China and Italy) sites. We found that differences in the distribution of isoprenoid GDGTs (iGDGTs) as well as of branched GDGTs (brGDGTs) are predominantly controlled by management type and only secondarily by climatic exposition. In general, upland soil had higher crenarchaeol contents than paddy soil, which by contrast was more enriched in GDGT-0. The GDGT-0 ∕ crenarchaeol ratio, indicating the enhanced presence of methanogenic archaea, was 3–27 times higher in paddy soils compared to other soils and increased with the number of rice cultivation cycles per year. The index of tetraethers consisting of 86 carbons (TEX86) values were 1.3 times higher in upland, bushland and forest soils than in paddy soils, potentially due to differences in soil temperature. In all soils brGDGT predominated over iGDGTs with the relative abundance of brGDGTs increasing from subtropical to tropical soils. Higher branched vs. isoprenoid tetraether (BIT) values in paddy soils compared to upland soils together with higher BIT values in soils from subtropical climates indicated effects on the amounts of brGDGT induced by differences in management as well as climate. In acidic soils cyclization ratio of branched tetraethers (CBT) values correlated well with soil pH. In neutral to alkaline soils, however, no correlation but an offset in CBT between paddy and upland managed soils was detected. This is interpreted as indicating soil moisture exerting an additional control on the CBT in these soils. Lower modified methylation index of branched tetraether (MBT′) values and temperatures calculated from this (TMC) in paddy soils compared to upland soils are attributed to a management-induced (e.g. enhanced soil moisture via flooding) effect on mean annual soil temperature (MST).

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