Results 41 to 50 of about 4,031,279 (409)
The Impact of Grazing on the Grass Composition in Temperate Grassland
Agronomy, 2020 Grazing is one of the predominant human activities taking place today inside protected areas, with both direct and indirect effects on the vegetation community. We analyzed the effects of grazing intensity on grass composition during four grazing seasons
Yousif Mohamed Zainelabdeen +6 more
doaj +1 more source
Satellite-based high-resolution maps of cocoa planted area for Côte d'Ivoire and Ghana [PDF]
arXiv, 2022 C\^ote d'Ivoire and Ghana, the world's largest producers of cocoa, account for two thirds of the global cocoa production. In both countries, cocoa is the primary perennial crop, providing income to almost two million farmers. Yet precise maps of cocoa planted area are missing, hindering accurate quantification of expansion in protected areas ...
arxiv
Group quantization of parametrized systems I. Time levels [PDF]
J.Math.Phys. 36 (1995) 4612-4638, 1994 A method of quantizing parametrized systems is developed that is based on a kind of ``gauge invariant'' quantities---the so-called perennials (a perennial must also be an ``integral of motion''). The problem of time in its particular form (frozen time formalism, global problem of time, multiple choice problem) is met, as well as the related difficulty ...
arxiv +1 more source
The Analysis and Interpretation of Seedling Recruitment Curves [PDF]
, 1993 We derive spatially explicit population models for the interaction between a species of annual plant and a community of perennial species. The models are used to explore the conditions for persistence of the annual in both a constant and a stochastic ...
Rees, M., Long, M.J.
core +1 more source
Molecular mechanisms of flowering phenology in trees
Forestry Research, 2023 Flower initiation is a phenological developmental process strictly regulated in all flowering plants. Studies in Arabidopsis thaliana, a model plant organism in plant biology and genetics, and major cereal crops have provided fundamental knowledge and ...
Jun Wang, Jihua Ding
doaj +1 more source
Reactive glass and vegetation patterns [PDF]
, 2002 The formation of vegetation patterns in the arid and the semi-arid climatic zones is studied. Threshold for the biomass of the perennial flora is shown to be a relevant factor, leading to a frozen disordered patterns in the arid zone. In this ``glassy'' state, vegetation appears as a singular plant spots separated by irregular distances, and an ...
arxiv +1 more source
BMC Plant BiologyBackground Seed morphology and color are critical agronomic traits in Medicago spp., reflecting adaptations to diverse environments and influencing seedling establishment and vigor.
Seunghyun Lim +10 more
doaj +1 more source
Water relations of woody perennial plant species
OENO One, 2007 Aims: To describe the relation of various water status measures of woody perennial plants (predawn and midday stem and leaf water potential), to indices of physiological activity such as leaf conductance, vegetative growth and fruit growth and ...
Kenneth A. Shackel
doaj +1 more source
The GeoLifeCLEF 2023 Dataset to evaluate plant species distribution models at high spatial resolution across Europe [PDF]
arXiv, 2023 The difficulty to measure or predict species community composition at fine spatio-temporal resolution and over large spatial scales severely hampers our ability to understand species assemblages and take appropriate conservation measures. Despite the progress in species distribution modeling (SDM) over the past decades, SDM have just begun to integrate
arxiv
Ambiguous Dependence Of Minimal Plant Generation Time On Nuclear DNA Content [PDF]
, 2010 AMBIGUOUS DEPENDENCE OF MINIMAL PLANT GENERATION TIME ON NUCLEAR DNA CONTENT Victor B. Ivanov The minimum generation time (MGT) of plant development was suggested to depend on nuclear DNA content, which varies in plants over wide limits1.
Victor B. Ivanov
core +1 more source