scholarly journals Accelerating Capoeira Regeneration on Degraded Pastures in the Northeastern Amazon by the Use of Pigs or Cattle

2019 ◽  
Vol 11 (6) ◽  
pp. 1729
Author(s):  
Stefan Hohnwald ◽  
Osvaldo Kato ◽  
Helge Walentowski
Keyword(s):  
Forest Restoration ◽  
Forest Succession ◽  
Ground Cover ◽  
Bare Soil ◽  
Tree Seeds ◽  
And Control ◽  
On Farm ◽  
Overnight Stays ◽  
Bare Soils ◽  
Degraded Pastures

In the humid tropics of Latin America, considerable proportions of agro-scapes are covered with degraded pastures that were taken over by dense weedy shrub canopies hampering further forest succession. While tree seeds are still constantly dispersed by bats and birds, these often do not reach the soil but got stuck in the dense shrubby vegetation. While manual up-rooting of weedy shrubs or tree replantation is too expensive, we tested if burrowing pigs or trampling cattle can enhance proportions of bare soils for fallow restoration. These hypotheses were tested in on-farm experiments at Igarapé-Açu, northeastern Pará. Soil-opening effects of ten pigs (40 days + nights) and ten oxen (40 overnight stays), respectively, were tested against manual clearing and control on three plots per treatment, respectively. Ground cover percentages of bare soil, weedy shrubs, grasses, and tree species were visually determined in 40 plots/treatment before and directly after treatments, and half a year later (n = 480 samples). Both animal treatments could not really match manual clearing (62%) but pigs reached above 36% bare ground cover, while cattle just 20%. As pigs are almost omnipresent on Amazonian smallholdings and even give a modest economic refund, the use of pigs is recommended to smallholders who want to break up the lush weed layers for the benefit of forest restoration.

Screening of broad-leaved tree species to restore Eucalyptus urophylla Blake forest on Sanjiao Island, China

2021 ◽  
Vol 52 (1) ◽  
pp. 131-142
Author(s):  
L.X. Chang ◽  
F.Y. Zhang ◽  
Z.K. Zhang ◽  
B.M. Chen ◽  
S.S. Ye ◽  
...  
Keyword(s):  
Tree Species ◽  
Forest Restoration ◽  
Bare Soil ◽  
Total Phenols ◽  
Mixed Stands ◽  
Allelopathic Potential ◽  
Acacia Confusa ◽  
Bauhinia Purpurea ◽  
Celtis Sinensis ◽  
Bare Soils

This study aimed to test the allelopathic effects of Eucalytus urophylla Blake. forest soil on 5-native broad-leaved tree species (Bauhinia purpurea L., Acacia confusa Merr., Acacia podalyriifolia A. Cunn. ex G. Don., Celtis sinensis Pers. Liquidambar formosana Hance) to select suitable species for restoration of E. urophylla forest. Three types of soils [E. urophylla soil, other plants soil and bare soil] were used to determine their allelopathic potential. The total phenols concentrations in soil were measured, and the correlations between total phenols and plant growth indices were analyzed. E. urophylla soil significantly inhibited the basal diameters of Bauhinia purpurea L. and Acacia confusa Merr. and biomass of Acacia podalyriifolia A. Cunn. ex G. Don. but significantly improved the biomass of Celtis sinensis Pers. and diameter of Liquidambar formosana Hance. The total phenols in soil accounted for these results, except for A. podalyriifolia. Thus, L. formosana, C. sinensis and A. confusa can be suggested as suitable tree spp to establish mixed stands with E. urophylla. Besides, B. purpurea, A. podalyriifolia, A. confusa and L. formosana can be used for restoration in bare soil, while B. purpurea, A. confusa and L. formosana are suitable species to restore vegetation in other plants soil. Keywords: Acacia confuse, Acacia podalyriifolia, Allelopathy, bare soils, Bauhinia purpurea, broad-leaved trees, Celtis sinensis, Eucalytus urophylla, E. urophylla soil, forest restoration, island, other plants soil, rhizosphere soil, total phenols

Effects of sea urchin and herbivorous gastropod removal, coupled with transplantation, on seaweed forest restoration

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Seokwoo Hong ◽  
Junsu Kim ◽  
Young Wook Ko ◽  
Kwon Mo Yang ◽  
Daniela Macias ◽  
...  
Keyword(s):  
Forest Restoration ◽  
Control Site ◽  
Eastern Coast ◽  
First Year ◽  
Survey Period ◽  
Red Algal ◽  
Rapid Restoration ◽  
Experimental Treatments ◽  
And Control ◽  
Herbivorous Gastropods

Abstract This study aims to investigate the relative effects of urchin removal, non-urchin gastropod herbivores removal, and transplantation on macroalgal forest restoration using an additive manipulation design. A field experiment was conducted in subtidal urchin barren rocks in the eastern coast of South Korea from August 2017 to June 2020 with three experimental treatments: no urchins (NU), NU plus no herbivorous gastropods (NH), NH plus Ecklonia bicyclis transplant (NHT). Six months after experiment initiation, seaweed abundance rapidly increased in all three experimental treatments. The highest peak was found in the spring season of the first year (2018). The year-to-year variations became smaller throughout the survey period. The results of comparing NU and control site indicated that urchin removal had an exclusive effect on algal recovery while additional removal of herbivorous gastropods did not affect algal recovery quantitatively. With the successful establishment of E. bicyclis, the community assemblages of the three treatments became more distinct in the subsequent years, showing diverse dominance in NU, red algal dominance in NH, and dominance of E. bicyclis canopy and understory groups in NHT. This study provides evidence that urchin removal on its own from barren grounds can lead to rapid restoration of seaweed forest in subtidal habitats.

scholarly journals INFLUÊNCIA DA COBERTURA MORTA NA EVAPOTRANSPIRAÇÃO, COEFICIENTE DE CULTIVO E EFICIÊNCIA DE USO DE ÁGUA DO MILHO CULTIVADO EM CERRADO

Irriga ◽  
2018 ◽  
Vol 21 (2) ◽  
pp. 352
Author(s):  
HIPÓLITO MURGA-ORRILLO ◽  
WELLINGTON FARIAS ARAUJO ◽  
CARLOS ABANTO RODRIGUEZ ◽  
RICARDO MANUEL BARDALES LOZANO ◽  
ROBERTO TADASHI SAKAZAKI ◽  
...  
Keyword(s):  
Zea Mays ◽  
Water Use Efficiency ◽  
Water Use ◽  
Water Consumption ◽  
Irrigation Management ◽  
Crop Coefficient ◽  
Ground Cover ◽  
Bare Soil ◽  
Crop Cycle ◽  
Use Efficiency

INFLUÊNCIA DA COBERTURA MORTA NA EVAPOTRANSPIRAÇÃO, COEFICIENTE DE CULTIVO E EFICIÊNCIA DE USO DE ÁGUA DO MILHO CULTIVADO EM CERRADO HIPÓLITO MURGA-ORRILLO1; WELLINGTON FARIAS ARAÚJO2; CARLOS ABANTO-RODRIGUEZ3; ROBERTO TADASHI SAKAZAKI4; RICARDO MANUEL BARDALES-LOZANO5 E ANA ROSA POLO-VARGAS6 1Engenheiro Agrônomo, Prof. Auxiliar, Universidad Nacional Autónoma de Chota, (UNACH), Jr. Gregorio Malca Nº 875- Campus Colpa Matara, Chota, Perú. [email protected] Agrônomo, Prof. Dr. Associado da UFRR/CCA, Boa Vista, RR. [email protected] Florestal, Investigador no Instituto de Investigaciones de la Amazonía Peruana, Carretera Federico Basadre, Km 12,400, Yarinacocha, Ucayali, Perú. [email protected] Agrônomo, Doutorando na UFRR/CCA, Boa Vista, RR. [email protected] Agrônomo, Doutorando na UFRR/Bionorte, Boa Vista, RR. [email protected] Agrônoma, Graduada na Universidad Nacional de Cajamarca, (UNC), Av. Atahualpa Nº 1050- Carretera Cajamarca-Baños del Inca, Cajamarca, Perú. [email protected]  1 RESUMOA irrigação consome grande quantidade de água, sendo importante um adequado manejo da cultura para minimizar esse consumo, maximizando a produção. No intuito de obter informações para o manejo da irrigação, objetivou-se com o presente trabalho determinar a evapotranspiração da cultura (ETc), o coeficiente de cultivo (Kc) e a eficiência do uso de água (EUAg) da cultura de milho, em solo com e sem cobertura, durante os diferentes estádios de desenvolvimento, utilizando lisímetros de drenagem. O experimento foi conduzido no campus Cauamé da Universidade Federal de Roraima, entre 19/04/2014 e 07/08/2014, em Boa Vista, RR. A evapotranspiração de referência (ETo) foi estimada pelo método de Penman-Monteith FAO. Os resultados da ETc do milho, durante o ciclo da cultura, em solo sem e com cobertura foram de 421,5 e 351,0 mm, respectivamente. As médias diárias de ETc foram de 4,1 mm dia-1 para solo sem cobertura e 3,4 mm dia-1 para solo com cobertura. A cobertura do solo propiciou valores diferentes de Kc's para o milho, nos mesmos estádios, em comparação aos Kc’s do solo descoberto. Para o solo descoberto, os Kc’s observados para os estádios fenológicos I, II, III, e IV, foram de 0,40; 0,84; 1,59 e 0,81, respectivamente. Já para solo com cobertura, os Kc’s pelos mesmos estádios em menção foram 0,28; 0,64; 1,49 e 0,48, respectivamente. A EUAg para solo com cobertura foi 1,77 kg m-3 e para solo sem cobertura foi 1,65 kg m-3. Estes resultados mostram que a cobertura morta no solo influenciou no consumo hídrico do milho durante todo seu ciclo. Palavras-chave: Zea mays. Irrigação. Solo coberto. Consumo hídrico.  MURGA-ORRILLO, H.; ARAÚJO, W. F.; ABANTO-RODRIGUEZ C.; SAKAZAKI, R. T.; BARDALES-LOZANO R. M.; POLO-VARGAS, A. R.MULCH INFLUENCE ON EVAPOTRANSPIRATION, CROP COEFFICIENT AND WATER USE EFFICIENCY OF CORN GROWN IN THE SAVANNAH   2 ABSTRACTIrrigation consumes large amounts of water, and minimizing consumption and maximizing the production are  important to a proper crop management . In order to obtain information for irrigation management, the aim of the present study was to determine evapotranspiration (ETc),  crop coefficient (Kc) and  water use efficiency (WUE) of maize grown in soil with and without cover, during the various stages of development, using drainage lysimeters. The experiment was conducted in Cauamé campus of the Federal University of Roraima, from 19/04/2014 to 08/07/2014, in Boa Vista, RR. The reference evapotranspiration (ETo) was estimated by the Penman-Monteith method. The results of the corn ETc during the crop cycle in soil with and without coverage were 421.5 and 351.0 mm, respectively. The daily average of ETc were 4.1 mm day-1 for bare soil and 3.4 mm day-1 for soil with cover. The ground cover led to different values of Kc's for corn in the same stages as compared to Kc's from the bare ground. For bare soil, the Kc's observed for the phenological stages I, II, III, and IV were 0.40; 0.84; 1.59 and 0.81, respectively. As for covered soil, the Kc's in the same stadiums mentioned were 0.28; 0.64; 1.49 and 0.48, respectively. The WUE to soil with cover was 1.77 kg m-3 and ground without cover was 1.65 kg m-3. These results show that  soil mulching influenceS maize water consumption throughout its cycle. Keywords: Zea mays. Irrigation. Ground covered. Water consumption.

Spectral mapping of soil organic carbon

2021 ◽  
pp. 263-286
Author(s):  
Bas van Wesemael ◽  
Keyword(s):  
Large Scale ◽  
Bare Soil ◽  
Parent Material ◽  
Spectral Mapping ◽  
Pilot Studies ◽  
Surface Conditions ◽  
Spectral Models ◽  
Spectral Libraries ◽  
Bare Soils

This chapter first reviews recent pilot studies covering limited areas often with exposed bare soils. Then we focus on the challenges for large-scale application of spectral mapping when the soil and parent material are heterogeneous and surface conditions are unknown. In order to deal with these constraints we discuss i) calibration of spectral models based on large spectral libraries, ii) surface conditions that disturb the soil signal, and iii) time series of images in order to delimit cropland fields and increase the extent of bare soil that can be mapped. Finally, a case study deals with a SOC prediction map derived from the spectra of a Sentinel-2 image and calibrated using the LUCAS spectral library.

History as Natural History

1994 ◽  
Author(s):  
Donald Worster
Keyword(s):  
Natural History ◽  
Environmental History ◽  
Forest Succession ◽  
Revolutionary War ◽  
Ecological Succession ◽  
Aldo Leopold ◽  
The Past ◽  
Westward Movement ◽  
And Control ◽  
The Way

Forty years ago a wise, visionary man, the Wisconsin wildlife biologist and conservationist Aldo Leopold, called for “an ecological interpretation of history,” by which he meant using the ideas and research of the emerging field of ecology to help explain why the past developed the way it did. At that time ecology was still in its scientific infancy, but its promise was bright and the need for its insights was beginning to be apparent to a growing number of leaders in science, politics, and society. It has taken a while for historians to heed Leopold’s advice, but at last the field of environmental history has begun to take shape and its practitioners are trying to build on his initiative. Leopold’s own suggestion of how an ecologically informed history might proceed had to do with the frontier lands of Kentucky, pivotal in the westward movement of the nation. In the period of the revolutionary war it was uncertain who would possess and control those lands: the native Indians, the French or English empires, or the colonial settlers? And then rather quickly the struggle was resolved in favor of the Americans, who brought along their plows and livestock to take possession. It was more than their prowess as fighters, their determination as conquerors, or their virtue in the eyes of God that allowed those agricultural settlers to win the competition; the land itself had something to contribute to their success. Leopold pointed out that growing along the Kentucky bottomlands, the places most accessible to newcomers, were formidable canebrakes, where the canes rose as high as fifteen feet and posed an insuperable barrier to the plow. But fortunately for the Americans, when the cane was burned or grazed out, the magic of bluegrass sprouted in its place. Grass replaced cane in what ecologists call the pattern of secondary ecological succession, which occurs when vegetation is disturbed but the soil is not destroyed, as when a fire sweeps across a prairie or a hurricane levels a forest; succession refers to the fact that a new assortment of species enters and replaces what was there before.

scholarly journals Characteristics, Occurrence, Detection and Detoxification of Aflatoxins in Foods and Feeds

Foods ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 644
Author(s):  
Amirhossein Nazhand ◽  
Alessandra Durazzo ◽  
Massimo Lucarini ◽  
Eliana B. Souto ◽  
Antonello Santini
Keyword(s):  
Safety Concern ◽  
Chemical Properties ◽  
Aflatoxin Contamination ◽  
Health Concern ◽  
International Agency ◽  
Human Beings ◽  
Consumer Safety ◽  
Carcinogenic Substances ◽  
And Control ◽  
On Farm

Mycotoxin contamination continues to be a food safety concern globally, with the most toxic being aflatoxins. On-farm aflatoxins, during food transit or storage, directly or indirectly result in the contamination of foods, which affects the liver, immune system and reproduction after infiltration into human beings and animals. There are numerous reports on aflatoxins focusing on achieving appropriate methods for quantification, precise detection and control in order to ensure consumer safety. In 2012, the International Agency for Research on Cancer (IARC) classified aflatoxins B1, B2, G1, G2, M1 and M2 as group 1 carcinogenic substances, which are a global human health concern. Consequently, this review article addresses aflatoxin chemical properties and biosynthetic processes; aflatoxin contamination in foods and feeds; health effects in human beings and animals due to aflatoxin exposure, as well as aflatoxin detection and detoxification methods.

Post-fire seeding with ryegrass: implications for understorey plant communities and overall effectiveness

2015 ◽  
Vol 24 (4) ◽  
pp. 518
Author(s):  
Melissa A. McMaster ◽  
Andrea Thode ◽  
Michael Kearsley
Keyword(s):  
Ponderosa Pine ◽  
Plant Cover ◽  
Ground Cover ◽  
Plant Invasions ◽  
Bare Soil ◽  
Italian Ryegrass ◽  
Exotic Plant ◽  
Vegetative Cover ◽  
High Severity ◽  
Significant Difference

Seeding following high-severity wildfires is motivated by the goals of increasing vegetative cover and decreasing bare soil in order to minimise soil erosion and exotic plant invasions. We compared the ground cover and vegetation response of seeded versus non-seeded areas located in the Warm Fire in northern Arizona, where post-fire seeding treatments with Italian ryegrass (Lolium perenne spp. multiflorum (L.)) were conducted in 4000 ha of high-severity burned areas. Over the course of the study, we observed no significant difference between seeded and non-seeded plots in percentage of bare soil, total vegetative cover or exotic plant cover. However, there were significant differences in plant community composition as revealed by PERMANOVA and Indicator Species Analysis. Two years post-fire there were significantly fewer ponderosa pine seedlings, and the cover of annual and biennial forbs was significantly lower in plots that were seeded with Italian ryegrass. In the third year, the cover of native bunch grasses was significantly lower in seeded plots. The differences we observed may be due to differences in pre-existing vegetation composition because of the geographic separation of the plots across the landscape. Our results illustrate the ineffectiveness of post-fire seeding in achieving the goals of increasing vegetative cover and decreasing the invasion of non-native plants, and we suggest that alternative post-fire remediation should be considered in the future.

scholarly journals Cowpea yield on soils with residues of NPK and natural phosphate fertilizers in succession the area of degraded pasture

Revista CERES ◽  
2016 ◽  
Vol 63 (4) ◽  
pp. 553-567 ◽  
Author(s):  
Pedro Emerson Gazel Teixeira ◽  
Antonio Rodrigues Fernandes ◽  
Jessivaldo Rodrigues Galvão ◽  
Wendel Valter da Silveira Pereira ◽  
Sandro Rogério Almeida Casanova ◽  
...  
Keyword(s):  
Phosphorus Content ◽  
Block Design ◽  
Residual Effect ◽  
Dry Mass ◽  
Phosphate Fertilizers ◽  
Natural Phosphate ◽  
Randomized Block Design ◽  
Degraded Pasture ◽  
And Control ◽  
Degraded Pastures

ABSTRACT The cultivation of cowpea [Vigna unguiculata (L) Walp] can be an important alternative in succession to maize in areas of degraded pastures due to the use of residue from fertilizers . With this, we aimed to evaluate the productivity of cowpea as a successor culture to undergo corn doses of reactive natural phosphate Arad and combinations with NPK. The experimental design was a randomized block design in a split plot with four replications. The fertilizer was applied in previous cultivation (crop) using four phosphate doses in the form of Arad natural phosphate: 50, 100, 200 and 300 kg ha-1 of P2O5 and the sub-plots in combination with NPK, NK, NK + liming, and control (no liming and fertilizer). The cowpea yield components were evaluated in this work. The residues of P2O5 from the natural phosphate increased the phosphorus content in the plant and influenced the number of grains per pod. The residual effect of NK+ liming and only NK showed better results for the variables grain yield, number of pods per plant, number of seeds per pod and dry mass of aerial part. The residual effect of NPK showed better results for the mass of 100 grains.

scholarly journals Distinguishing Photosynthetic and Non-Photosynthetic Vegetation: How Do Traditional Observations and Spectral Classification Compare?

2019 ◽  
Vol 11 (21) ◽  
pp. 2589 ◽  
Author(s):  
Claire Fisk ◽  
Kenneth Clarke ◽  
Steven Delean ◽  
Megan Lewis
Keyword(s):  
Full Range ◽  
Significant Proportion ◽  
Ground Cover ◽  
Bare Soil ◽  
Remotely Sensed ◽  
Spectral Unmixing ◽  
Field Methodology ◽  
Wheat Leaves ◽  
Vegetation Samples

Remotely sensed ground cover maps are routinely validated using field data collected by observers who classify ground cover into defined categories such as photosynthetic vegetation (PV), non-photosynthetic vegetation (NPV), bare soil (BS), and rock. There is an element of subjectivity to the classification of PV and NPV, and classifications may differ between observers. An alternative is to estimate ground cover based on in situ hyperspectral reflectance measurements (HRM). This study examines observer consistency when classifying vegetation samples of wheat (Triticum aestivum var. Gladius) covering the full range of photosynthetic activity, from completely senesced (0% PV) to completely green (100% PV), as photosynthetic or non-photosynthetic. We also examine how the classification of spectra of the same vegetation samples compares to the observer results. We collected HRM and photographs, over two months, to capture the transition of wheat leaves from 100% PV to 100% NPV. To simulate typical field methodology, observers viewed the photographs and classified each leaf as either PV or NPV, while spectral unmixing was used to decompose the HRM of the leaves into proportions of PV and NPV. The results showed that when a leaf was ≤25% or ≥75% PV observers tended to agree, and assign the leaf to the expected category. However, as leaves transitioned from PV to NPV (i.e., PV ≥ 25% but ≤ 75%) observers’ decisions differed more widely and their classifications showed little agreement with the spectral proportions of PV and NPV. This has significant implications for the reliability of data collected using binary methods in areas containing a significant proportion of vegetation in this intermediate range such as the over/underestimation of PV and NPV vegetation and how reliably this data can then be used to validate remotely sensed products.

Sign in / Sign up

Export Citation Format

Share Document