5 research outputs found

    Pattern of distribution of angiosperm plant richness along latitudinal and longitudinal gradients of India

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    We analyzed a national database on plant richness with 7761 species from 15,565 nested quadrants to offer the maiden and indicative plant richness pattern of India across its latitudinal and longitudinal gradient. We observed two peaks in the species richness curves along both latitudinal and longitudinal gradients, due to harbouring of higher species richness in the Western Ghats and the Himalayan hot spots. The bands at 10°–11°N latitude and 76°–77°E longitude accommodate maximum of 703 and 864 number of plant species respectively, which could be explained due to cumulative contribution of (i) the Western Ghats, Eastern Ghats, Lakshadweep and Andaman and Nicobar islands along latitudinal; and (ii) the Western Ghats, central India and the Western Himalaya along longitudinal gradients. On dissection of the relationship between plant richness to environment (i.e., geographic area, topography and vegetation types) using Generalized Additive Model (GAM), we observed varied explanations for latitude and longitude. While geographic area and topography explained (98.8% deviance) to the species richness pattern across longitude, all three explained (99% deviance) to the distribution pattern along latitude. We also found that the species richness and vegetation types are positively correlated. Environmental heterogeneity, especially geographic area, topography and disturbance explain the distribution pattern of plant richness in India. Knowing the spatial pattern of plant richness could help in formulating large-scale conservation measures for India. It is hoped that the study would attract larger readership, particularly the Indian bio-geographers

    Rubber production in Continental Southeast Asia : its potentialities and limitations

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    This thesis focuses on three climate-related aspects of Para rubber (Hevea brasiliensis) cultivation in areas where altitudes and latitudes higher than its endemic range create conditions which are labeled nontraditional, suboptimal or marginal for rubber cultivation: 1. rubber yield in relation to the meteorological conditions preceding harvest events, 2. potential geographical shifts in rubber cultivation through climate change and 3. assessment of climate driven susceptibility to South American leaf blight (Pseudocercospora ulei) of rubber.Untersucht wurden im Rahmen der Dissertation drei klimabezogene Aspekte des Kautschukanbaus (Hevea brasiliensis) in Gebieten, die im Allgemeinen auf Grund ihrer geographischen Lage (nördl./südl. des 10. Breitengrades) als suboptimal, nicht-traditionell oder wenig geeignet beschrieben werden. Dabei stand die Bildung von Ertragsmodellen in direkter Abhängigkeit von lokalen Wetterbedingungen und die durch den Klimawandel entstehenden Optionen zur Expansion und/oder Reduktion der Flächen für den Kautschukanbau auf überregionaler Ebene, sowie die globale Risikobewertung für die Infektionswahrscheinlichkeit mit der südamerikanischen Blattfallkrankheit (Pseudocercospora ulei) im Zentrum der Arbeit

    Genetic and Phenotypic Variation in Tree Crops Biodiversity

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    Recently, there has been a dramatic increase in the use of DNA-derived data and innovative phenotyping to obtain insights into the causative genes underlying traits of agronomical interest or to characterize tree genetic resources. The latter, in particular, could represent an important source of genetic diversity that can be readily used to enhance the adaptability to limiting environmental factors and resistance to biotic stresses or to promote novel genotypes with improved agronomic traits. On the whole, the studies collected in this book report on tree crop biodiversity characterization that could provide the essential building blocks to ensure future improvements in production and quality, as well as for innovations in tree crop development and utilization

    Dipterocarps protected by Jering local wisdom in Jering Menduyung Nature Recreational Park, Bangka Island, Indonesia

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    Apart of the oil palm plantation expansion, the Jering Menduyung Nature Recreational Park has relatively diverse plants. The 3,538 ha park is located at the north west of Bangka Island, Indonesia. The minimum species-area curve was 0.82 ha which is just below Dalil conservation forest that is 1.2 ha, but it is much higher than measurements of several secondary forests in the Island that are 0.2 ha. The plot is inhabited by more than 50 plant species. Of 22 tree species, there are 40 individual poles with the average diameter of 15.3 cm, and 64 individual trees with the average diameter of 48.9 cm. The density of Dipterocarpus grandiflorus (Blanco) Blanco or kruing, is 20.7 individual/ha with the diameter ranges of 12.1 – 212.7 cm or with the average diameter of 69.0 cm. The relatively intact park is supported by the local wisdom of Jering tribe, one of indigenous tribes in the island. People has regulated in cutting trees especially in the cape. The conservation agency designates the park as one of the kruing propagules sources in the province. The growing oil palm plantation and the less adoption of local wisdom among the youth is a challenge to forest conservation in the province where tin mining activities have been the economic driver for decades. More socialization from the conservation agency and the involvement of university students in raising environmental awareness is important to be done

    Applied Ecology and Environmental Research 2017

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