990 resultados para forest protection
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Mode of access: Internet.
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Pittman-Robertson Federal Aid Project.
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Latest issue consulted: 2004.
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"IEPA/WPC/90-171."--Cover.
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"1993."
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"Final Report for IDOT Project No.: WR-09118/SRA-190"
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"January 1998."
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Appendix to chapter XIII "Anthropology," and to chapter XIV "Pygmies and forest negroes," by Dr. F. Shrubsall.
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Description based on: 1979; title from cover.
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4 leaves in pocket on p. [3] of cover.
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"Sponsors, University Extension, University of California, Davis ... [et al.] ; co-sponsors, Corps of Engineers, U.S. Army ... [et al.]"--P. [2] of cover.
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"March 2000."
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Shipping list no.: 2000-0219-P (pt. 1), 2000-0328-P (pt. 2), 2001-0124-P (pt. 3).
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A phytosociological study of the forests from Sierra Maestra is conducted, following the methodology of the Zurich- Montpelier School. They are transformed into a forest typology using the standards of the Institute of Agro-Forestry Research. In general, 35 types and/or subtypes are presented. From this group, the most abundant ones belong to semi-deciduous microphyll forest, followed by those from mangroves and mountain rainforest, respectively. Silvicultural treatments are needed; among them, the protection forests are those found above 800 m asl and mangroves.
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Effects of fire on biogeochemical cycling in terrestrial ecosystem are widely acknowledged, while few studies have focused on the bacterial community under the disturbance of long-term frequent prescribed fire. In this study, three treatments (burning every two years (B2), burning every four years (B4) and no burning (B0)) were applied for 38 years in an Australian wet sclerophyll forest. Results showed that bacterial alpha diversity (i.e. bacterial OTU) in the top soil (0-10 cm) was significantly higher in the B2 treatment compared with the B0 and B4 treatments. Non-metric multidimensional analysis (NMDS) of bacterial community showed clear separation of the soil bacterial community structure among different fire frequency regimes and between the depths. Different frequency fire did not have a substantial effect on bacterial composition at phylum level or bacterial 16S rRNA gene abundance. Soil pH and C:N ratio were the major drivers for bacterial community structure in the most frequent fire treatment (B2), while other factors (EC, DOC, DON, MBC, NH 4 +, TC and TN) were significant in the less frequent burning and no burning treatments (B4 and B0). This study suggested that burning had a dramatic impact on bacterial diversity but not abundance with more frequent fire.