Viabilidade do Hidrogel na Recuperação de Cerrado sensu stricto com Espécies Nativas

Abstract

RESUMOEste estudo determinou o custo e o efeito de polímero hidrorretentor (hidrogel) na redução da mortandade de mudas de seis espécies florestais nativas do Cerrado, na recuperação de área degradada em Planaltina -Distrito Federal. Foram testados quatro tratamentos (com e sem hidrogel nas estações seca e chuvosa) em delineamento em blocos casualizados com quatro blocos e três repetições por bloco. ANOVA e teste de Tukey revelaram que o hidrogel reduziu significativamente a mortandade na estação seca, mas não teve efeito significativo na estação chuvosa. Considerando o custo de substituição de mudas mortas, o tratamento sem hidrogel foi mais caro que com hidrogel na estação seca. O plantio no final da estação seca com hidrogel representa alternativa viável para reduzir a mortandade de mudas via mitigação dos efeitos do estresse hídrico pós-transplante no final da estação seca, sem representar custo significativo adicional aos programas de recuperação de áreas degradadas de Cerrado.Palavras-chave: polímero hidrorretentor, recuperação de áreas degradadas, cerrado sensu stricto. Viability of Hydrogel in cerrado sensu stricto Revegetation with Native Species ABSTRACTWe determined the cost and effect of a water retention polymer (hydrogel) in reducing mortality of planted seedlings of six Cerrado forest species in the restoration of a degraded area in Planaltina county -Brazilian Federal District. We tested four treatments (hydrogel use and no hydrogel use in dry and rainy seasons) in a randomized block design, with four blocks and three replications per block. ANOVA and Tukey's test revealed that hydrogel significantly reduced mortality in the dry season, and had no significant effect in the rainy season. Regarding the cost of dead seedlings replacement, the treatment without hydrogel was more expensive than the one with hydrogel in the dry season. Planting at the end of the dry season using hydrogel is a viable alternative in reducing mortality of seedlings via mitigation of water stress effects after transplantation, without significant additional cost to recovery programs of Cerrado degraded areas.

HYDROGEL AND WATER REGIMES IN THE CHLOROPHYLL- A FLUORESCENCE AND GROWTH OF Campomanesia xanthocarpa SEEDLINGS

“…Therefore, the use of hydrogels may be an alternative for seedlings planted in recovery areas of previously degraded forests, aiding in the success of silvicultural activities (Fonseca et al, 2017). Seedlings of some tree species have shown strong growth responses with hydrogel addition to the soil, including Handroanthus ochraceus (Cham.)…”

WATER-RETAINING POLYMER MITIGATES THE WATER DEFICIT IN Schinus terebinthifolia: PHOTOSYNTHETIC METABOLISM AND INITIAL GROWTH

“…Tropical regions, particularly the Cerrado ecoregion, are characterized by different vegetation types and climatic seasonality that are caused by water fluctuations, leading to water deficit in certain periods of the year as a consequence of precipitation fluctuations (Fonseca et al, 2017). The low water availability in the soils of the Cerrado region can cause functional and metabolic damage to plants, such as stomatal closure, reduced Rubisco carboxylation efficiency, and increased intercellular CO2 concentration and production of reactive oxygen species (ROS), thereby compromising plant photosynthetic capacity and growth (França et al, 2017;Resende et al, 2019).…”

Effects of the planting of legume species and soil conditions on the recovery of a sand and pebble mining area

“…The largest Cajanus sp. biomass observed, which did not differ from C. ensiformis (L.) DC and M. pruriens (L.) under hydrogel conditions, may be related to soil water retention with this type of material (Fonseca et al, 2017). This can happen despite the lack of response to the use of hydrogel in other treatments, which can occur in certain edaphoclimatic conditions (Navroski et al, 2014).…”