排序方式: 共有34条查询结果,搜索用时 156 毫秒
31.
Jaramillo C Ochoa D Contreras L Pagani M Carvajal-Ortiz H Pratt LM Krishnan S Cardona A Romero M Quiroz L Rodriguez G Rueda MJ de la Parra F Morón S Green W Bayona G Montes C Quintero O Ramirez R Mora G Schouten S Bermudez H Navarrete R Parra F Alvarán M Osorno J Crowley JL Valencia V Vervoort J 《Science (New York, N.Y.)》2010,330(6006):957-961
Temperatures in tropical regions are estimated to have increased by 3° to 5°C, compared with Late Paleocene values, during the Paleocene-Eocene Thermal Maximum (PETM, 56.3 million years ago) event. We investigated the tropical forest response to this rapid warming by evaluating the palynological record of three stratigraphic sections in eastern Colombia and western Venezuela. We observed a rapid and distinct increase in plant diversity and origination rates, with a set of new taxa, mostly angiosperms, added to the existing stock of low-diversity Paleocene flora. There is no evidence for enhanced aridity in the northern Neotropics. The tropical rainforest was able to persist under elevated temperatures and high levels of atmospheric carbon dioxide, in contrast to speculations that tropical ecosystems were severely compromised by heat stress. 相似文献
32.
Cohn DL Smith V Pizarro M Jones-Engel L Engel G Fuentes A Shaw E Cortes J 《Veterinary parasitology》2007,145(1-2):116-119
Pedicinus spp. parasitize several species of nonhuman primates. This is the first published report confirming the presence of Pedicinus albidus (Rudow) infestation in the free-ranging macaques (Macaca sylvanus) of Gibraltar. The diagnosis of pediculosis was based upon finding adult lice on host animals. 相似文献
33.
Maria V. Fernandez Warid A. Warid Juan M. Loaiza Montiel C. Agustin 《Plant foods for human nutrition (Dordrecht, Netherlands)》1997,50(4):279-286
The developmental pattern of jicama (Pachyrhizus erosus (L.) Urban) was studied by sampling plants aged 20 to 36 weeks at weekly intervals. There was an increase in all characteristics
of foliage: fresh and dry weight, number of leaves per plant, main stem length, number of leaves, nodes and internodes of
the main stem; and in all root characteristics: fresh and dry weight, diameter and length. The chemical analysis was determined
for roots at different plant ages. The range values for dry matter were 16.19–22.28%, protein 1.11–1.62%, fat 0.553–0.867%,
crude fiber 0.3048–0.3943%, and ash 0.669–1.089%. The chemical constituents fluctuated with age but without specific trends.
These values are considered the first record of roots produced by plants grown in Mexico. 相似文献
34.
Marco Schiavon Travis W. Shaddox Karen E. Williams Sergio Gallo P. Agustin Boeri J. Bryan Unruh Jason Kruse Kevin Kenworthy 《Journal of Agronomy and Crop Science》2023,209(1):1-11
Several new bermudagrass cultivars are available and commonly used on golf course fairways. However, little is known about their cultural requirements or how these cultivars perform under lower inputs regimes. A 2-year study was conducted at University of Florida, Fort Lauderdale Research and Education Center, to assess performance of four hybrid bermudagrass [Cynodon dactylon L. Pers. X Cynodon transvaalensis (Burtt-Davy)] cultivars (‘Latitude 36’, ‘Tifway 419’, ‘TifGrand’ and ‘TifTuf’), and 2 common bermudagrass (Cynodon dactylon L. Pers.) cultivars (‘Bimini’ and ‘Celebration’) irrigated at either 50% or 80% reference evapotranspiration (ETo) and fertilised at either 0, 146, 244, or 342 kg N ha−1 year−1. Plots were evaluated monthly for turfgrass quality, dark green colour index (DGCI), normalised difference vegetation index (NDVI), and Chlorophyll Index, and seasonally for N tissue content. Plots watered at 80% ETo enhanced bermudagrass quality compared to 50% ETo, DGCI and NDVI only in two months out of 24. Latitude 36 and Celebration were the top-rated cultivars, and their quality was not affected by no N fertilisation. Conversely, TifGrand, TifTuf and Tifway that received no N fertilisation resulted in insufficient quality during the second year of the study. Insufficient quality may be linked to reduced N metabolization compared to the highest rated cultivars. Results show that new cultivars such as Latitude 36 and Bimini could be maintained at sufficient quality levels with reduced water and N inputs in South Florida. 相似文献