نتایج جستجو برای: arrhenatherum
تعداد نتایج: 37 فیلتر نتایج به سال:
The interdependence of species richness and plant biomass has widely been accepted as a general biodiversity rule. However, there is no information about how relationships are established during colonization and how total biomass is distributed among plants. The main objective of this study was to determine the role of several factors which we have hypothetized as affecting biomass distribution...
Heinz Ellenberg's historically important work on changes in the abundances of a community of grass species growing along experimental gradients of water table depth has played an important role in helping to identify the hydrological niches of plant species in wet meadows. We present a previously unpublished complete version of Ellenberg's dataset from the 1950s together with the results of a s...
Possible control options are investigated for the introduced Hieracium weeds, particular problems in South Island high country, New Zealand. In a pot experiment regression of input to output ratios of above ground biomass over successive harvests, from binary mixtures was used to determine the competitive interaction between 13 pasture species and two Hieracium species, H. pilosella and H. prae...
Rapid monitoring and early elimination are important measures to control the spread of invasive plants. Ambrosia artemisiifolia is a globally distributed harmful weed. The aim this study was clarify invasion habitat preferences A. interspecific associations or phylogenetic relationships between native species in Yili River Valley Xinjiang, China. We identified preferred types , investigated com...
Management by combined grazing and mowing events is commonly used in grasslands, which influences the activity and composition of soil bacterial communities. Whether observed effects are mediated by management-induced disturbances, or indirectly by changes in the identity of major plant species, is still unknown. To address this issue, we quantified substrate-induced respiration (SIR), and the ...
Within-species and among-species differences in growth responses to a changing climate have been well documented, yet the relative magnitude of within-species vs. among-species variation has remained largely unexplored. This missing comparison impedes our ability to make general predictions of biodiversity change and to project future species distributions using models. We present a direct comp...
Fourier transform infrared spectra of saffron (Crocus sativus L.) samples were acquired using attenuated total reflectance (ATR-FTIR). The main objective the study was to determine chemical composition 11 collected from different areas in Morocco chemometric analysis ATR-FTIR fingerprints and identifying adulterated among bought local markets countries (Spain, Iran, Morocco). authenticity purit...
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