Comparative longevity of seeds of five tropical rain forest woody species stored under different moisture conditions

1996 ◽  
Vol 74 (10) ◽  
pp. 1635-1639 ◽  
Author(s):  
Carlos Vázquez-Yanes ◽  
Alma Orozco-Segovia
Keyword(s):  
Rain Forest ◽  
Tropical Rain Forest ◽  
Room Temperature ◽  
Soil Seed Bank ◽  
Woody Species ◽  
Lettuce Seeds ◽  
Absolute Requirement ◽  
Moisture Regimes ◽  
Petri Dishes ◽  
Moisture Conditions

Seeds of five plant species from the tropical rain forest of southeastern Mexico were stored for up to 7 years under two divergent moisture regimes at room temperature: (i) air-dried seeds were stored in paper bags and (ii) water-imbibed seeds were stored in Petri dishes kept in total darkness. Seeds in the latter regime remained dormant because of an absolute requirement of light for germination. Another experiment involved the storage of seeds of one of the species in a gradient of intermediate moisture conditions within glass chambers. Results indicate that water-imbibed seeds retain viability for a longer time than any of the other moisture levels employed. This agreed with observations made on photoblastic lettuce seeds by other authors. Keywords: Carica, Piper, longevity of imbibed seeds, soil seed bank, tropical rain forest, Urera.

Viable seeds buried in the tropical forest soils of Xishuangbanna, SW China

2000 ◽  
Vol 10 (3) ◽  
pp. 255-264 ◽  
Author(s):  
Min Cao ◽  
Yong Tang ◽  
Caiyu Sheng ◽  
Jianhou Zhang
Keyword(s):  
Rain Forest ◽  
Negative Impact ◽  
Soil Depth ◽  
Soil Seed Bank ◽  
Woody Species ◽  
Secondary Forests ◽  
Slash And Burn ◽  
Soil Seed Banks ◽  
Forest Sites ◽  
Viable Seeds

AbstractThis paper examines the composition and density of soil seed banks under a mature seasonal rain forest (>150 years old), three secondary forests (4 yr Trema orientalis forest, 9 yr Macaranga denticulata forest and 25 yr Mallotus paniculatus forest) and in a slash-and-burn field of Xishuangbanna, southwest China. Seeds in the secondary forests germinated most rapidly in the first week, while the seeds of the seasonal rain forest and the slash-and-burn field soils germinated slowly over the first 6 weeks and peaked in the seventh and eighth weeks. Seed densities were 4585–65,665 seeds m−2 for forest sites and 1130 seeds m−2 for the slash-and-burn field in the top 10 cm of the soils. The seed density decreased with soil depth in the forest sites and tended to decline during succession. Herbs accounted for the largest proportion of seeds at all five sites. The importance of woody species, however, increased as forests became older. Slash and burn eliminated a large number of seeds in the upper soil and, consequently, reversed the vertical distribution of seeds in the soil and had a negative impact on family, genus and species richness of the soil seed bank as well.

The Effects of a Tropical rain Forest Cover on Airborne Gamma-Ray Spectrometry

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Enio B. Pereira ◽  
Daniel J.R. Nordemann
Keyword(s):  
Rain Forest ◽  
Tropical Rain Forest ◽  
Forest Cover ◽  
Gamma Ray ◽  
Gamma Ray Spectrometry

Para solicitação de resumo, entrar em contato com editor-chefe ([email protected]). 

scholarly journals (5d RG-flow) trees in the tropical rain forest

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Marieke van Beest ◽  
Antoine Bourget ◽  
Julius Eckhard ◽  
Sakura Schäfer-Nameki
Keyword(s):  
Large Class ◽  
Rain Forest ◽  
Tropical Rain Forest ◽  
Field Theories ◽  
Flavor Symmetry ◽  
Superconformal Field Theories ◽  
Hasse Diagrams ◽  
Flavor Symmetries ◽  
Rank 2 ◽  
Mass Deformation

Abstract 5d superconformal field theories (SCFTs) can be obtained from 6d SCFTs by circle compactification and mass deformation. Successive decoupling of hypermultiplet matter and RG-flow generates a decoupling tree of descendant 5d SCFTs. In this paper we determine the magnetic quivers and Hasse diagrams, that encode the Higgs branches of 5d SCFTs, for entire decoupling trees. Central to this undertaking is the approach in [1], which, starting from the generalized toric polygons (GTPs) dual to 5-brane webs/tropical curves, provides a systematic and succinct derivation of magnetic quivers and their Hasse diagrams. The decoupling in the GTP description is straightforward, and generalizes the standard flop transitions of curves in toric polygons. We apply this approach to a large class of 5d KK-theories, and compute the Higgs branches for their descendants. In particular we determine the decoupling tree for all rank 2 5d SCFTs. For each tree, we also identify the flavor symmetry algebras from the magnetic quivers, including non-simply-laced flavor symmetries.

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