UNIVERSIDADE FEDERAL DE CAMPINA GRANDE - Cstr.ufcg.edu.br

More documents

Recommendations

Info

ABSTRACTNUNES, Shirley Tavares Nunes. Recovery of degraded Caatinga sites by planting thornyand thornless varieties of the native tree species Mimosa tenuiflora and Cnidoscolusquercifolius). Patos-PB: UFCG, 2012. 74 sheets. (Dissertation – M.Sc. in Forest Sciences).2012.Among the activities carried out in the semiarid region of northeast Brazil, agriculture andcattle raising cause most of the environmental impacts, especially on the vegetation. Naturalregeneration of the vegetation in degraded Caatinga sites is very slow, and humanintervention is necessary. This study compared the effects of the thorny and thornless varietiesof two native trees (Mimosa tenuiflora and Cnidicoscolus quercifolius) on the recovery ofdegraded Caatinga sites during three consecutive growing seasons, by collecting data onlength and basal diameter of the two planted trees, soil cover by herbs and tree canopy,production and quality of herb and tree forage, and chemical and physical soil attributes.Control plots (no tree planting and browsing, although browsing was allowed in some controlplots) were established close to the experiment for comparisons purposes. Naturalreestablishment of herb cover is observed in the first year when browsing is not allowed,while natural reestablishment of tree cover on browsed or non-browsed plots showed to beinexistent or incipient and results from thorny M. tenuiflora individuals only. Recovery of treecover can be accelerated by planting native trees, especially M. tenuiflora. Its fine branchescan be pruned in the third growing season after planting to collect forage and to reduceshadowing that turned to be detrimental to production of herb forage. Thorny and thornlessvarieties of M. tenuiflora showed no significant differences. Positive effects from C.quercifolius were observed on herb growth and production, although no fine branches werepruned as its canopy growth was not enough to affect negatively herb species. Thorny C.quercifolius showed higher survival and growth than its thornless counterpart, and geneticimprovement should be carried out on these characters before this variety can beadvantageously used. Animal deferment and tree planting resulted in improvements on soilattributes, especially on soil field capacity and density. Further researches should be carriedout to check some observed trends, such as the increase in soil OM and available P, and thedecrease in soil K to choose the appropriate management soil and vegetation practices toeffectively reinsert the degraded area into the productive system. Planting of thornless M.tenuiflora and thorny C. quercifolius in areas where no browsing is allowed is an effectiveway to recover degraded Caatinga sites, and result in high levels of soil cover, increase inforage quantity and quality, and amelioration in some soil attributes such as density and waterstorage capacity. These improvements certainly help in the sustainability of the cattle raisingactivity in the Caatinga.Keywords: Plant cover. Forage quantity and quality. Soil atributes. Semiarid.
LISTA DE FIGURASFigura 1 − Imagem de satélite das áreas experimentais................................................. 22Figura 2 − Esquema da disposição das parcelas experimentais em um bloco............... 23Figura 3 − Curvas e modelos de regressão do crescimento da jurema preta................. 28Figura 4 − Cobertura herbácea e arbórea nas parcelas com plantio de jurema preta..... 31Figura 5 − Curvas e modelos de regressão do crescimento da favela........................... 48Figura 6 − Cobertura herbácea e arbórea em parcelas com plantio de favela ............... 50
Page 1 and 2: UNIVERSIDADE FEDERAL DE CAMPINA GRA
Page 3 and 4: GrN972rFICHA CATALOGRÁFICADados de
Page 5 and 6: A toda a minha família, especialme
Page 7: RESUMONUNES, Shirley Tavares Nunes.
Page 11 and 12: SUMÁRIO1 Introdução.............
Page 13 and 14: 1 IntroduçãoO Bioma Caatinga apre
Page 15 and 16: 142 Referencial teórico2.1 Áreas
Page 17 and 18: 16porém seu plantio é recomendado
Page 19 and 20: 18edáficos) e expõem as camadas s
Page 21 and 22: 20qualidade física do solo, e são
Page 23 and 24: 22vegetação em que predominavam d
Page 25 and 26: 24As parcelas corresponderam às qu
Page 27 and 28: 263.5.4 Biomassa forrageiraA biomas
Page 29 and 30: 4 Resultados e Discussão4.1 Experi
Page 31 and 32: 30mm/planta) médios, respectivamen
Page 33 and 34: 32prejudicada mesmo sem a presença
Page 35 and 36: 344.1.4 Produção de biomassa forr
Page 37 and 38: 36Araújo Filho (1985; 1992) aconse
Page 39 and 40: ecompensando com forragem e proteç
Page 41 and 42: 40(ANDRADE, 2008). Estes dados suge
Page 43 and 44: Tabela 4 - Atributos químicos e f
Page 45 and 46: para aumentar os teores de P e MO d
Page 47 and 48: 46Além do acúmulo da MO do solo,
Page 49 and 50: Comprimento (cm)Diâmetro (mm)48O c
Page 51 and 52: Cobertura vegetal (%)50pioneiras pa
Page 53 and 54: 52PE. Segundo esses autores, esses
Page 55 and 56: teores médios de FDA foram similar
Page 57 and 58: 56Estes valores corroboram os achad
Page 59 and 60:
58de 1,5% de MO no solo será ating
Page 61 and 62:
5 ConclusõesO plantio das espécie
Page 63 and 64:
ReferênciasANDRADE, L.A.; PEREIRA,
Page 65 and 66:
BAKKE, I.A.; BAKKE, O.A.; ANDRADE,
Page 67 and 68:
66CLEMENT, C.R. Pupunha: recursos g
Page 69 and 70:
68INMET - Instituto Nacional de Met
Page 71 and 72:
PACIULLO, D.S.C.; CARVALHO, C.A.B.;
Page 73 and 74:
72SAMPAIO, E. V. S. B.; ARAUJO, E.
show all

UNIVERSIDADE FEDERAL DE CAMPINA GRANDE - Cstr.ufcg.edu.br

Create successful ePaper yourself

Delete template?

Save as template?