Visual assessment of pasture degradation: validation by ground cover and seasonal variation

Monteiro, Edevaldo de Castro; Burak, Diego Lang; Cunha, Alexson de Mello; Passos, Renato Ribeiro; Mendonça, Eduardo de Sá

doi:10.5935/1806-6690.20180020

Cited by 8 publications

(8 citation statements)

References 2 publications

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“…The high number of classes of degradation complicates the separation of neighboring classes in the field (Monteiro et al, 2018). The values obtained for weighted kappa show that, after the effect of these confusions is revealed, the method of digital classification and mapping generates thematic maps with good accuracy.…”

Section: Resultsmentioning

confidence: 99%

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Mapping and characterization of intensity in land use by pasture using remote sensing

Calegario

Pereira

et al. 2019

Rev. bras. eng. agríc. ambient.

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The current demand for food has been met through the exploitation of natural reserves. Brazil has 26% of its extension occupied by agricultural uses, 62% of which are pastures. Degraded pastures have greater land use intensity than well-managed pastures, leading to greater degradation of the environment. Land use classification systems consider that pastures are well managed, a misconception for the Brazilian reality. Based on this approach, it was aimed to develop a methodology for mapping the intensity of land use by pasture via remote sensing. The method of mapping was developed and validated in basins with different soil and climatic characteristics. Three calibrations were performed based on NDVI values to ascertain the influence on the results, being evaluated from the field campaigns and the kappa and weighted kappa indices. The kappa and weighted kappa indices presented reasonable and moderate agreement, respectively. The results were considered as satisfactory for the three calibrations, evidencing that the degree of degradation of the pastures can be estimated in a simple way by remote sensing. The Limoeiro River Basin has around 46.9% of pastures, at least, heavily degraded and 96.6% with some degree of degradation, which contributes to degradation of the natural resources and reduction of livestock farming and economic potential of the basin.

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Section: Resultsmentioning

confidence: 99%

“…The methodology was developed considering eight classes of use intensity exerted by pastures, but it can be used if a lower number of classes is satisfactory and, according to the considerations of Monteiro et al (2018), its accuracy may be increased.…”

Section: Resultsmentioning

confidence: 99%

Mapping and characterization of intensity in land use by pasture using remote sensing

Calegario

Pereira

et al. 2019

Rev. bras. eng. agríc. ambient.

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“…In pasture pig operations, an appropriate grazing management is necessary to prevent damage to the pasture and, consequently, soil degradation. The amount of ground cover in a certain pasture will be dependent on a variety of factors including the pasture species, climate, soil, pasture management [13] and seasonal variability [14]. The establishment of an adequate stocking rate is a key management component to assure the preservation of ground cover levels required to avoid negative environmental consequences.…”

Section: Ground Covermentioning

confidence: 99%

Effects of Growing-Finishing Pig Stocking Rates on Bermudagrass Ground Cover and Soil Properties

Pietrosemoli

Raczkowski

Green

et al. 2020

Animals

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This study compares four stocking rates (37, 74, 111 and 148 pigs ha−1) for growing to finishing pigs (18.4 ± 0.5 kg and 118.5 ± 2.0 kg and 35.7 ± 2.1 kg and 125.7 ± 2.3 kg initial and final BW for grazing periods 1 and 2, respectively) and their effect on ground cover and soil traits in bermudagrass (Cynodon dactylon [L.] Pers) pastures, over two 14-week grazing periods (July–September and May–August). The study was conducted at the Center for Environmental Farming systems at the Cherry Research Station, Goldsboro North Carolina. A continuous stocking method was implemented to manage the pasture. The percent ground cover was estimated with a modified step point technique. Soil samples were collected in three sampling positions (center, inner and outer areas of the paddocks) and two soil sampling depths (0–30 and 30–90 cm). The experimental design was a completely randomized block with three field replicates. Data were analyzed using the PROC GLIMMIX procedure of SAS/STAT ® Version 9.4. Greater ground cover and lesser soil nutrient concentrations were registered in bermudagrass paddocks managed with 37 pigs ha−1. The results of this study also validated the existence of a spatial pattern of soil properties, which differed among sampling positions and depths.

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“…The dung, footprint, and forage activity reflected the relative use and or access of the encroachment category by herbivores (Pfeffer, 2016). Within each plot, tree species were identified and their structure (canopy diameter, stem diameter at 1m height, seedling occurrence, height) recorded and bare ground cover was visually estimated (Monteiro, Burak, Cunha, & Passos, 2018). Multi-stemmed woody plants were considered as separate individuals if they were >40 cm apart (Tefera, Dlamini, & Dlamini, 2008).…”

Section: Sampling Strategymentioning

confidence: 99%

Woody Encroachment Extent and Its Associated Impacts on Plant and Herbivore Species Occurrence in Maswa Game Reserve, Tanzania

Kimaro¹,

Asenga²,

Treydte³

2019

ENRR

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Habitat degradation caused by woody plant encroachment has been a common phenomenon in savanna ecosystems. An increasing woody plant cover in open grassland reduces grazing grounds and, consecutively, impacts mammalian herbivores, but structural changes and their associated impact have rarely been assessed and quantified. We analyzed the extent of woody plant encroachment via remote sensing and used transects and plots to assess encroaching woody plant species and their associated impacts on herbaceous plant and herbivore species in Maswa Game Reserve, Tanzania. We found that woody plant cover had increased by 0.5% to 2.6% per annum over the last thirty years, while in other parts of the park it has decreased by 0.5% to 1.5% per annum. Acacia drepanolobium was the dominant encroaching woody species, and the number of stems in heavily encroached sites was seven times and three times higher than in open grassland and at medium encroached sites, respectively. In encroached plots, grazer and mixed feeder species occurrence were reduced while the presence of browser species was slightly elevated. Furthermore, our finding shows that bare ground cover is positively correlated with an increase of woody plant cover. Additionally, the number of herbaceous species slightly increased with the increase of woody plant encroachment, while the herbaceous cover was negatively correlated with the increase of woody plant cover. We suggest that fire regimes should be taken up to suppress the ongoing encroachment processes while strongly encroached sites might need mechanical intervention to control dense vegetation. This emphasis is on fire, particularly prescribed fire as a management tool of vegetation in Savanna ecosystem. We conclude that, woody plant encroachment is driven by different factors such as fire, mega-herbivores and topology that may interactively trigger woody plant encroachment in Savanna ecosystem.

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Visual assessment of pasture degradation: validation by ground cover and seasonal variation

Cited by 8 publications

References 2 publications

Mapping and characterization of intensity in land use by pasture using remote sensing

Mapping and characterization of intensity in land use by pasture using remote sensing

Effects of Growing-Finishing Pig Stocking Rates on Bermudagrass Ground Cover and Soil Properties

Woody Encroachment Extent and Its Associated Impacts on Plant and Herbivore Species Occurrence in Maswa Game Reserve, Tanzania

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