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The refercnce to Bouguer anomalies in the caption to Fig. 2 of the report by W. H. Kanes et al. (Science, 1 June 1973, p. 950) is in error. Isostatic anomalies are meant.-Ed. 相似文献
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Diversity, density and species composition of naturally regenerated woody plants under Eucalyptus grandis plantation and the adjacent natural forest were investigated and compared. Twenty plots, with an area of 20 m × 20 m for
each, were established in both of E. grandis plantation and adjacent natural forest, independently. In each plot, species name, abundance, diameter and height were recorded.
Numbers of seedling were collected in five sub-plots (4 m2) within each major plot. A total of 46 species in the plantation, and 52 species in the natural forest, which belongs to
36 families were recorded. The diversity of species (H′) is 2.19 in the plantation and 2.74 in the natural forest. The density of understory woody plant was 3842 stems/ha in the
plantation and 4122 stems/ha in the natural forest. The densities of seedlings in the natural forest and the plantation were
8101 stems/ha and 4151 stems/ha, respectively. High similarity of woody species composition was found between the natural
forest and the plantation. The E. grandis plantation was found favoring the regeneration and growth of Millitia ferruginia and Coffea arabica in a much better way than other underneath woody species. 相似文献
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本文调查了桉树人工林和邻近天然林内土著的木本植物多样性、密度和物种组成。桉树人工林和邻近天然林内分别圈画出20个20m×20m样地,记录下每块样地内的物种名称、物种丰富度、植株直径和高度以及采集亚样方(4m2)内幼苗数目。本试验中,记录人工林内木本植物46种,邻近天然林内52种,分别来自36个科。人工林内,物种多样性(H’)为2.19,林下木本植物密度为3842株/hm2,幼苗密度为4151株/hm2;而天然林内的物种多样性、林下树木密度和幼苗密度分别为2.74,4122株/hm2和8101株/hm2。两种林分的木本植物物种组成相似性较高。研究还表明,桉树人工林适合于Millitia ferruginia和小果咖啡生长和再生,而对下层木本则不适合。 相似文献
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Tazebachew Asres Yihunie Cherinet Alem Gesesse 《Journal of Crop Science and Biotechnology》2018,21(1):67-74
Ten field pea genotypes were evaluated in randomized complete block design with four replications for three consecutive years (2010-2012) main cropping seasons at four locations in each year. The objectives were to determine magnitude of genotype by environment interaction and to identify stable field pea genotype with high grain yield to be released as a cultivar to producer for Northwestern Ethiopia. The GGE [genotype main effect (G) and genotype by environment interaction (GE)] biplot graphical tool was used to analyze yield data. The combined analysis of variance revealed a significant difference (P<0.01) among genotypes, environments and genotype-by-environment interaction for grain yield. The average environment coordinate biplot revealed that EH99005-7 (G2) was the most stable and the highest yielding genotype. Polygon view of GGE-biplot showed the presence of three mega-environments. The first section includes the test environments E1 (Adet 2010), E3 (Debretabor 2010), E5 (Adet 2011), E6 (Motta 2011), E7 (Debretabor 2011), E8 (Dabat 2011), E9 (Adet 2012) and E12 (Dabat 2012) which had the variety G1 (EH99009-1) as the winner; the second section contains the environments E4 (Dabat 2010), E10 (Motta 2012) and E11 (Debretabor 2012) with G2 as the best grain yielder and the third section contains the E2 (Motta 2010) with G4 (Tegegnech X EH90026-1-3-1) as the best grain yielder. The comparison GGE- biplot of field pea genotypes with the ideal genotype showed that G2 was the closest genotype for the ideal cultivar. Among the twelve environments, E2, E6 and E10 were more discriminating and E3, E9 and E12 were less discriminating. Genotype EH99005-7 was the most stable and the highest yielding genotype. As a result it is released officially for Northwestern Ethiopia. Therefore, it is recommended to use genotype EH99005-7 for wider cultivation in Northwestern Ethiopia and similar areas. 相似文献
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The formation and development of a zone of spreading beneath the continental crust resulted in the breakup of Pangea and formation of the Atlantic Ocean. The crust of Morocco bears an extremely complete record of the crustal response to this episode of mantle dynamics. Structural and related depositional patterns indicate that the African margin had stabilized by the Middle Jurassic as a marine carbonate environment; that it was dominated by tensile stresses in the early Mesozoic, resulting in two fault systems paralleling the Atlantic and Mediterranean margins and a basin and range structural-depositional style; and that it was affected by late Paleozoic metamorphism and intrusion. Mesozoic events record the latter portion of African involvement in the spreading episode; late Paleozoic thermal orogenesis might reflect the earlier events in the initiation of the spreading center and its development beneath significant continental crust. In that case, more than 100 million years were required for mantle dynamics to break up Pangea. 相似文献
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Antiorio Ana Tada Fonseca Brasil Alemán-Laporte Jilma de Freitas Ana Paula Pauloni Yamamoto Pedro Kenzo Cintra Luciana Mori Claudia Madalena Cabrera 《Veterinary research communications》2022,46(1):1-8
Veterinary Research Communications - Although laboratory animals experience pain as a necessary component of the objectives of experimental protocols, the level of pain should be minimized through... 相似文献