Fechar
Metadados

@PhDThesis{Mendes:2018:DiRaFi,
               author = "Mendes, Lucin{\'e}ia da Silva Sousa",
                title = "Din{\^a}mica de ra{\'{\i}}zes finas em rela{\c{c}}{\~a}o 
                         {\`a} disponibilidade sazonal de nutrientes e de diferentes 
                         n{\'{\i}}veis de deposi{\c{c}}{\~a}o {\'u}mida em florestas 
                         tropicais",
               school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                 year = "2018",
              address = "S{\~a}o Jos{\'e} dos Campos",
                month = "2018-02-20",
             keywords = "ra{\'{\i}}zes finas, decomposi{\c{c}}{\~a}o de 
                         ra{\'{\i}}zes, biomassa abaixo do solo, floresta tropical, 
                         n{\'u}cleo tropical, fine roots, decomposition of roots, biomass 
                         below ground, tropical forest, ingrowth core.",
             abstract = "Os estudos sobre a Produtividade de Ra{\'{\i}}zes (PR) em 
                         rela{\c{c}}{\~a}o {\`a} disponibilidade de nutrientes no solo e 
                         na atmosfera associados {\`a}s condi{\c{c}}{\~o}es 
                         meteorol{\'o}gicas contribuem para o aperfei{\c{c}}oamento das 
                         estimativas regionais de produtividade prim{\'a}ria em Florestas 
                         Tropicais. Investiga{\c{c}}{\~o}es sobre PR possuem um 
                         importante papel na compreens{\~a}o da rela{\c{c}}{\~a}o entre 
                         clima e processos biol{\'o}gicos. Nesse contexto, a pesquisa em 
                         quest{\~a}o tem por objetivo investigar a din{\^a}mica de 
                         ra{\'{\i}}zes finas ( \≤ 2 mm), identificar e relacionar 
                         os principais fatores que controlam a produ{\c{c}}{\~a}o, a taxa 
                         de decomposi{\c{c}}{\~a}o, a disponibilidade de carbono e 
                         nutrientes e deposi{\c{c}}{\~a}o {\'u}mida em tr{\^e}s 
                         s{\'{\i}}tios florestais em diferentes est{\'a}dios 
                         sucessionais na Mata Atl{\^a}ntica, que foram: Parque Estadual da 
                         Serra do Mar N{\'u}cleo Cunha Indai{\'a} (PESM-Cn), {\'a}rea de 
                         refer{\^e}ncia e, minimamente antropizada; Parque Estadual das 
                         Fontes do Ipiranga (PEFI), {\'a}rea inserida na Regi{\~a}o 
                         Metropolitana da cidade de S{\~a}o Paulo (RMSP), altamente 
                         impactada e a Unidade Regional do INPE de Cachoeira Paulista 
                         (URCP), {\'a}rea em recupera{\c{c}}{\~a}o, considerada rural. 
                         Foi utilizada a t{\'e}cnica de n{\'u}cleo de crescimento 
                         (ingrowth), sacolas de decomposi{\c{c}}{\~a}o (litter bags) e 
                         coletores de chuva tipo bulk para medir respectivamente, 
                         produ{\c{c}}{\~a}o, decomposi{\c{c}}{\~a}o e 
                         deposi{\c{c}}{\~a}o atmosf{\'e}rica. Al{\'e}m disso, foi 
                         analisada a composi{\c{c}}{\~a}o qu{\'{\i}}mica dos nutrientes 
                         contidos nos solos, ra{\'{\i}}zes e {\'a}gua de chuva a fim de 
                         identificar se este {\'e} um dos fatores que influenciam na 
                         din{\^a}mica de ra{\'{\i}}zes. Os resultados sugerem que as 
                         concentra{\c{c}}{\~o}es de nutrientes dispon{\'{\i}}veis no 
                         solo variaram em fun{\c{c}}{\~a}o das diferentes idades 
                         sucessionais dos s{\'{\i}}tios, e do n{\'{\i}}vel de 
                         perturba{\c{c}}{\~a}o e cobertura vegetal e apresentaram a 
                         seguinte ordem: PESM-Cn>PEFI>URCP. O s{\'{\i}}tio em 
                         est{\'a}dio inicial de sucess{\~a}o, URCP, apresentou maior 
                         valor de biomassa total de ra{\'{\i}}zes finas (BRF)(0,384Mg 
                         ha-1) quando comparado com o PEFI (0,253 Mg ha-1) e PESM-Cn (0,262 
                         Mg ha-1). Em rela{\c{c}}{\~a}o{\`a} taxa de 
                         decomposi{\c{c}}{\~a}o de ra{\'{\i}}zes (k), foram observados 
                         maiores valores durante a esta{\c{c}}{\~a}o chuvosade 2015 para 
                         a URCP (0,0129), PESM-Cn (0,0106) e para o PEFI (0,0075). Dentre 
                         os fatores que se destacaram como controladores da din{\^a}mica 
                         de ra{\'{\i}}zes finas em cada s{\'{\i}}tio estudado 
                         est{\~a}o: a qualidade qu{\'{\i}}mica do solo, textura e pH do 
                         solo, umidade e precipita{\c{c}}{\~a}o pluviom{\'e}trica. 
                         Constatou-se que a varia{\c{c}}{\~a}o na din{\^a}mica de 
                         ra{\'{\i}}zes finas {\'e} influenciada pela quantidade de 
                         precipita{\c{c}}{\~a}o, e n{\~a}o pela disponibilidade de 
                         nutrientes presentes na deposi{\c{c}}{\~a}o atmosf{\'e}rica, 
                         exceto no PESM-Cn onde ocorre alta deposi{\c{c}}{\~a}o de NO3- e 
                         no PEFI onde ocorre deposi{\c{c}}{\~a}o de NH4+, NO3- e COD. A 
                         maior propor{\c{c}}{\~a}o de biomassa a{\'e}rea (BA) foi 
                         encontrado no PESM-Cn (60,75 Mg ha-1), seguido pelo PEFI(27,39 Mg 
                         ha-1) e URCP (19,08 Mg ha-1). Como esperado, a 
                         varia{\c{c}}{\~a}o de BRF nos s{\'{\i}}tios estudados {\'e} 
                         menor do que a BA, porque a radicular tende a se ajustar ao 
                         n{\'{\i}}vel de {\'a}gua e nutrientes, j{\'a} a parte 
                         a{\'e}rea variou com o est{\'a}dio sucessional. Este estudo 
                         forneceu, pela primeira vez, uma an{\'a}lise temporal e espacial 
                         de decomposi{\c{c}}{\~a}o de ra{\'{\i}}zes finas na Mata 
                         Atl{\^a}ntica e ressalta a necessidade de avaliar aspectos da 
                         produ{\c{c}}{\~a}o de ra{\'{\i}}zes em escala de paisagem e 
                         durante per{\'{\i}}odos mais extensos de tempo, para que sejam 
                         produzidos dados mais robustos sobre din{\^a}mica de 
                         ra{\'{\i}}zes finas na Mata Atl{\^a}ntica. Os resultados deste 
                         xvi estudo ser{\~a}o {\'u}teis para balan{\c{c}}os de carbono e 
                         nutrientes nos compartimentos solo-planta-atmosfera, modelagem 
                         ambiental e estudos de ecossistemas. ABSTRACT: Studies on roots 
                         productivity in relation to the availability of nutrients in the 
                         soil and in the atmosphere associated with meteorological 
                         conditions contribute to the improvement of the regional estimates 
                         of primary productivity in Tropical Forests. Root productivity 
                         research has an important role in understanding the relationship 
                         between climate and biological processes. In this context, the 
                         present research aims to investigate the dynamics of fine roots ( 
                         \≤ 2 mm), to identify and relate the main factors 
                         controlling production, rate of decomposition, availability of 
                         carbon and nutrients and wet deposition in three forest sites in 
                         different successional stages in the Atlantic Forest, which are: 
                         Serra do Mar State Park - Cunha Indai{\'a} Nucleus (PESM-Cn), 
                         area of reference and, minimally anthropized; Ipiranga State Park 
                         (PEFI), a region within the Metropolitan Area of S{\~a}o Paulo 
                         (RMSP), highly impacted, and the National Institute for Space 
                         Research (INPE) Regional Unit of Cachoeira Paulista (URCP), a 
                         recovering area considered rural. The ingrowth technique, litter 
                         bags and bulk collectors were used to measure, respectively, 
                         production, decomposition and atmospheric deposition.In addition, 
                         the chemical composition of nutrients contained in soils, roots 
                         and rainwater in order to identify if this is one of the factors 
                         that influence in the dynamics of roots. The results suggest that 
                         the nutrient concentrations available in the soil varied according 
                         to the different successional ages of the sites and the level of 
                         disturbance and vegetation cover. They presented the following 
                         order: PESM-Cn> PEFI> URCP. The initial succession stage site, 
                         URCP, presented higher value of total fine root biomass (BRF) 
                         (0.384 Mg ha-1) when compared to PEFI (0.253 Mg ha-1) and PESM-Cn 
                         (0.262Mg ha -1). In relation to the root decomposition rate (k), 
                         higher values were observed during the rainy season of 2015 for 
                         URCP (0.0129), PESM-Cn (0.0106) and PEFI (0.0075). Among the 
                         factors that stood out as controllers of the dynamics of fine 
                         roots in each site studied are: soil chemical quality, soil 
                         texture and pH, humidity and rainfall. It was verified that the 
                         variation in the dynamics of fine roots is influenced by the 
                         amount of precipitation and not by the availability of nutrients 
                         present in the atmospheric deposition, except in the PESM-Cn where 
                         high deposition of NO3- occurs and in the PEFI where NH4+ 
                         deposition occurs, NO3- and COD. It was verified that the 
                         variation in the dynamics of fine roots is influenced by the 
                         amount of precipitation, and not by the availability of nutrients 
                         presented in the atmospheric deposition. The highest proportion of 
                         aerial biomass (BA), was found in PESM-Cn (60.75 Mg ha-1), 
                         followed by PEFI (27.39 Mg ha-1) and URCP (19.08 Mg ha-1). As 
                         expected, the BRF variation in the studied sites is lower than the 
                         BA because the root tends to adjust to the water and nutrients 
                         level, while the aerial part varied with the successional stage. 
                         This study provided, for the first time, a temporal and spatial 
                         analysis of fine root decomposition in the Atlantic Forest and 
                         emphasizes the need to evaluate aspects of the root production at 
                         the landscape scale and for further periods of time, in order to 
                         produce more data on the dynamics of fine roots in the Atlantic 
                         Forest. The results of this study will be useful for carbon and 
                         xviii nutrient balances in the soil-plant-atmosphere compartments, 
                         environmental modeling and ecosystem studies.",
            committee = "Alval{\'a}, Pl{\'{\i}}nio Carlos (presidente) and Forti, Maria 
                         Cristina (orientadora) and Becerra, Jorge Alberto Bustamante and 
                         Camargo, Pl{\'{\i}}nio Barbosa de and Leal, Karinne Reis 
                         Deusdar{\'a}",
         englishtitle = "Fine root dynamics in relation to the sazonal availability of 
                         nutrients and of different levels of humid deposition in tropical 
                         forest",
             language = "pt",
                pages = "186",
                  ibi = "8JMKD3MGP3W34P/3QFCPPL",
                  url = "http://urlib.net/rep/8JMKD3MGP3W34P/3QFCPPL",
           targetfile = "publicacao.pdf",
        urlaccessdate = "23 nov. 2020"
}


Fechar