Growth dynamics and senescence of digit grass as a response to several canopy heights

Filho, José Dantas Gusmão; Fries, Daniela Deitos; Sousa, Bráulio Maia de Lana; Fagundes, Jaílson Lara; Backes, Alfredo Acosta; Dias, Daniel Lucas Santos; Pinheiro, Sarita Socorro Campos; Teixeira, Fábio Andrade

doi:10.22319/rmcp.v11i1.4913

Cited by 7 publications

(6 citation statements)

References 16 publications

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“…These effects can alter the forage accumulation pattern (Gusmão Filho et al, 2020), especially in tropical grasses, as observed by Euclides et al (2008), who, when evaluating Massai and Mombaça, observed a lower forage mass accumulation rate between May and September, which is the period of lowest annual temperature in the Southern Hemisphere.…”

Section: Temperaturementioning

confidence: 90%

Fatores de desenvolvimento para plantas forrageiras e suas respostas sob condições de estresse

Ramos

Pedreira

Cruz

et al. 2022

RSD

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As mudanças climáticas aumentam a vulnerabilidade da produção agrícola, principalmente por proporcionarem estresse às plantas. Dessa forma, objetivou apresentar os fatores limitantes ao desenvolvimento de plantas forrageiras e como esses indivíduos respondem em situações de estresse. Os fatores que estão ligados ao desenvolvimento, e consequentemente a produção vegetal, são: água, luz, temperatura, solo e nutrientes. Cada um desses fatores atua de forma diferente nas plantas, desde os processos metabólicos até a produtividade da massa vegetal. Dessa forma, para que as plantas se desenvolvam eficientemente, esses fatores devem atuar dentro de uma faixa que permita a realização de suas funções básicas de crescimento e desenvolvimento. No entanto, caso um desses fatores de crescimento esteja atuando de forma negativa, ou seja, não esteja dentro do nível adequado de que o vegetal necessita, ele tem o potencial de submeter as plantas a condições de estresse, dependendo da sua intensidade e duração sobre a planta. Os fatores de crescimento influenciam diretamente nas características morfogênicas, e, consequentemente, nas características estruturais e no manejo do pastejo, este último é também considerado um fator limitante no desenvolvimento das plantas, devido a sua importância para a produção animal, em que se busca um equilíbrio entre a produtividade animal e vegetal. Portanto, para realizar um manejo da pastagem e do pastejo de forma eficiente e sustentável é necessário entender como as plantas são influenciadas pelos fatores abióticos, que estão ligadas ao seu desenvolvimento e como se comportam em situações de estresse.

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Section: Temperaturementioning

confidence: 90%

Fatores de desenvolvimento para plantas forrageiras e suas respostas sob condições de estresse

Ramos

Pedreira

Cruz

et al. 2022

RSD

View full text Add to dashboard Cite

show abstract

“…Canopy development regulates how vegetation intercepts and redistributes rainfall as net precipitation components and interception loss are controlled by leaf, branch, and stem features (Pypker et al, 2011). Seasonal growth of grass typically relates to leaf and stem production and increased leaf area index (LAI) (Gusmão Filho et al, 2020; Macedo et al, 2021). Vegetation height is proportional to water storage in herbaceous vegetation canopies (Xiong et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Spatial variation of grassland canopy affects soil wetting patterns and preferential flow

Demir

Michalzik

Filipzik

et al. 2022

Hydrological Processes

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Canopies shape net precipitation patterns, which are spatially heterogeneous and control soil moisture response to rainfall. The vast majority of studies on canopy water fluxes were conducted in forests. In contrast, grassland canopies are often assumed to be spatially homogeneous, therefore likely not inducing patches of heterogeneity at and below the soil surface. However, some studies on short‐structured vegetation, such as grasslands, proposed the importance of canopy‐induced heterogeneity for net precipitation. Still, systematic investigations on the effects on soil wetting patterns are missing. Therefore, in this study, we investigated soil moisture response to rainfall in a managed temperate grassland by exploring the individual impacts of spatially varying throughfall, vegetation height, and antecedent soil moisture status on the soil wetting patterns. We applied linear mixed effects models to disentangle the role of grassland canopy versus abiotic drivers. The spatial average soil water response showed diminishing water amounts stored in the upper parts of the soil as the growing season progressed and the soils dried, indicating bypass flow. Spatial variation of grass height was a significant driver of soil wetting patterns along with precipitation and antecedent soil moisture status. Soil wetting was suppressed in locations with tall canopies, although surprisingly, this was not directly related to throughfall patterns. Instead, our results suggest that seasonally drier conditions and the spatial difference in grass development amplify fast flow processes. Ultimately, our results confirm that spatial variation of the canopy affects soil moisture wetting patterns not only in forests but indicate a strong influence of preferential flow on soil water patterns in managed grassland as well.

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“…Moreover, stemflow partitioning in herbaceous vegetation is altered by thickness, height and angle of stems together with the rain intensity (de Ploey, 1982). The growth of stems and stem elongation, are promoted by taller canopy height (Gusmão Filho et al, 2020;Macedo et al, 2021). Thus, taller grass is expected to generate sizable stemflow, whereas shorter grass produces had a negligible amount of stemflow as found in prairie grass and wheat (Clark, 1940;Butler and Huband, 1985).…”

Section: Validation Of Net Precipitation Measurements Based On Soil W...mentioning

confidence: 99%

A Method Proposal for Throughfall Measurement in Grassland at Plot Scale in Temperate Climate: ‘Interception Tubes’

et al. 2022

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While net precipitation entering the soil is commonly measured in woody ecosystems, there is a lack of field measurements for herbaceous vegetation. Small canopy heights and fragile stem structures are the primary challenges for net precipitation sampling in grasslands under field conditions. We designed a new in situ device, “interception tubes”, for throughfall sampling in temperate grasslands. The instrument allows a natural development of grass canopy and sampling at multiple locations. Although it does not strictly separate throughfall and stemflow, the dominant part of the collected water is throughfall. We tested the interception tubes for splash loss with a drip experiment. Next, we evaluated the tubes’ measurements in a field installation at 25 locations both with and without vegetation cover. Also, we used measurements of gross precipitation, canopy height and soil water content to check the plausibility of the measurements. The experiment showed splash loss for the tubes is small ( < 3%) for the typical rain drop size for the growing season in the region, as well as for throughfall drops of lower falling velocity. In the uncovered period, splash loss corrected tubes’ measurements were generally smaller than classical funnel measurements. But the statistical model revealed that the slope of their relationship is close to unity (0.92) when accounting for topography and was probably related to wind effects. During the covered period, grass height systematically reduced below canopy precipitation measured by the tubes, indicating that they can capture spatial canopy drip patterns under denser grass foliage. The canopy height also altered the wind effect on the tube measurements. As in forest ecosystems, below canopy precipitation patterns were temporally stable and smaller events increased the spatial heterogeneity. The measured below canopy precipitation was between 95% and 22% that above, and grass height amplified the loss. The soil water balance showed the tubes underestimated soil water input at peak grass height, which suggests enhanced occurrence of stemflow in tall grass. Despite the underestimation of stemflow, the interception tubes are a suitable method for estimating the canopy effect on throughfall patterns in temperate grasslands, and stemflow can be quantified by additional soil moisture measurements.

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Growth dynamics and senescence of digit grass as a response to several canopy heights

Cited by 7 publications

References 16 publications

Fatores de desenvolvimento para plantas forrageiras e suas respostas sob condições de estresse

Fatores de desenvolvimento para plantas forrageiras e suas respostas sob condições de estresse

Spatial variation of grassland canopy affects soil wetting patterns and preferential flow

A Method Proposal for Throughfall Measurement in Grassland at Plot Scale in Temperate Climate: ‘Interception Tubes’

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