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Differences in organic matter quality, chemical and microbiological characteristics of two Phaeozems under natural and anthropic influence

Abstract

The soil degraded and changed by the anthropic activity must be monitored and the awareness of the intrinsic processes will allow a pertinent analysis of the effects of the application of the new technologies on the management and the sustainability of the soil.

Two natural and anthropic Phaeozems were analyzed from the point of view of chemical, microbiological characteristics, quality and composition of organic compounds.

Total values of microbial biomass and bacterial and fungal counts were generally twice higher in Calcaric Phaeozems than in Verti-Stagnic Phaeozems.

The content of humic precursors in Calcaric Phaeozems was quantitatively higher than that determined in Verti-stagnic Phaeozems, with a total content of phenols of 14.6mgGAExg−1d.m., polysaccharides and proteins of 97mgxg−1, respectivelly 16.6mgxl−1.

The ascending chromatograms showed specific distribution and higher density of the organic compounds in the CAFT sub-fraction of the Verti-stagnic Phaeozems. Pfeiffer specific chromatograms revealed an enzyme activity much higher than average at the Verti-stagnic Phaeozems, with a well-characterized functional diversity. The nutritional reserve appeared increased but poorly diversified in the Calcaric Phaeozems. Humification processes are intense, colloidal substances are present, the mineral component is very well integrated in the organic material at the Verti-stagnic Phaeozems and complex protein content is well revealed especially in the Calcaric Phaeozems.

Capillary dynamolysis reflected a characteristic pattern of Phaeozems soils, with particularities for each soil type, represented by colors, contours and particular forms of the specific structures developed.

Both soils presented good conditions for sustaining vegetation either natural or cultivated but results indicated that anthropic intervention determined a more dynamic mineralization of organic matter. Further monitoring of soil organic matter dynamics is needed and adjusting management practices for conservation of biodiversity and global ecosystem protection against the effect of anthropic intervention.

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Optimization of in vitro asymbiotic seed germination protocol for Serapias vomeracea

Edwin FG. Plant propagation by tissue culture Exegetics Ltd., Edington Wilts, UK, 1993. Edwin FG. Plant propagation by tissue culture Exegetics Ltd Edington Wilts, UK 1993 28 Gogoi K, Kumaria S, Tandon P. Ex situ conservation of Cymbidium eburneum Lindl.: a threatened and vulnerable orchid, by asymbiotic seed germination. 3 Biotech 2012; 2: 337. Gogoi K Kumaria S Tandon P. Ex situ conservation of Cymbidium eburneum Lindl.: a threatened and vulnerable orchid, by asymbiotic seed germination 3 Biotech 2012 2 337 29

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Renewables as important energy source for Moldova

involved in producing biofuel at industrial level. The energy potential was evaluated for all 25 species. In Table 1 it is shown the biofuel amounts yield from biomass treating as well as CO 2 obtained after their burning. One of the most strategically important options to increase share of global renewable energy market is to use biomass in energy circuit ( 1 ). But accelerated deployment of bioenergy resources can create conflicts related to land use, water resources and biodiversity conservation. From this point of view we need to raise a question if policies

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Proteases with caspase 3-like activity participate in cell death during stress-induced microspore embryogenesis of Brassica napus

reported the conservation between animal and plant proteases that lead to the cleavage of target proteins for the execution of cell death ( 16 , 17 ). Despite their key role in the regulation and execution of the death program, no caspase homologues have been found in plant genomes. Beside this, caspase-like enzymatic activity has been found to participate in plant specific developmental processes, for example the PCD of embryo suspensor in Picea abies ( 18 ), leaf morphogenesis of Aponogeton madagascariensis ( 19 ) or tapetum development in Nicotiana tabacum and

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The genus Portulaca as a suitable model to study the mechanisms of plant tolerance to drought and salinity

conservation. These include, for example, potential vegetable crops and grain crops such as: Salicornia europaea ( 18 ); Aster tripolium , Sesuvium portulacastrum ( 19 ); Inula crithmoides ( 20 , 21 ); Chenopodium quinoa ( 22 ) and Distichlis palmeri ( 23 ); oilseeds such as Salicornia bigelovii ( 24 ) and Suaeda fruticosa ( 25 ) and medicinal plants: Helianthus tuberosus ( 26 ), Achillea mellifolium , Verbena officinalis ( 27 ). Cultivation of drought and/or salt-tolerant plants in marginal lands, arid zones or salinised cropland under rainfed

Open access