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31.
Pristine and impaired mangrove soils (from road construction, aquaculture, and sewage) in Baja California Sur, Mexico were
investigated for methane dynamics, related soil properties, and their impact on initial establishment of black mangrove propagules.
All soils (Salic Fluvisols and Histosols) had neutral to alkaline pH, were saline, and had variable organic carbon content,
and redox potentials. Most pristine mangrove soils showed low methane concentration, low methane production rates, and no
methane emission. Impaired mangrove soil (from aquaculture) and mangrove soil affected by sewage water showed high methane
concentration, high methane production rates, and high methane emission, thus acting as a methane source. Elevated methane
concentrations, similar to levels detected in the impaired mangrove soil, reduce the growth of seedlings under closed chamber
conditions. Addition of sulfate to the soil reversed the trend. These results indicate that impaired mangrove soils in dry
climatic regions produce and emit methane and that elevated methane concentration in the vicinity of propagules may affect
establishment of mangrove seedlings in impaired mangrove soils.
This paper is in memory of the late mangrove researcher Dr. Gina Holguin of Mexico. 相似文献
32.
Antje Wewetzer 《Phytoparasitica》1998,26(1):47-52
The content of azadirachtin, an insecticidally active ingredient in neem tree [Azadirachta indica (A. Juss.)] seeds, varies considerably due to environmental factors and for genetic reasons. Furthermore, the tree does not grow in moderate climates. It seems appropriate, therefore, to employ tissue culture techniques for the production of azadirachtin in order to obtain constant amounts of standardized quality. We investigated if and how azadirachtin contents of callus cultures derived from various cell lines are affected by different nutrient media and carbohydrate concentrations. The azadirachtin contents of the calli were analyzed by TLC and HPLC. Azadirachtin contents of callus cultures varied depending on the cell line, the nutrient medium and the carbohydrate source employed. 相似文献
33.
Anna Lena Kunz Antje Labes Jutta Wiese Torsten Bruhn Gerhard Bringmann Johannes F. Imhoff 《Marine drugs》2014,12(4):1699-1714
Eight streptophenazines (A–H) have been identified so far as products of Streptomyces strain HB202, which was isolated from the sponge Halichondria panicea from the Baltic Sea. The variation of bioactivities based on small structural changes initiated further studies on new derivatives. Three new streptophenazines (I–K) were identified after fermentation in the present study. In addition, revised molecular structures of streptophenazines C, D, F and H are proposed. Streptophenazines G and K exhibited moderate antibacterial activity against the facultative pathogenic bacterium Staphylococcus epidermidis and against Bacillus subtilis. All tested compounds (streptophenazines G, I–K) also showed moderate activities against PDE 4B. 相似文献
34.
Antje Moll 《Potato Research》1992,35(3):287-295
Zusammenfassung In sieben Versuchsjahren beeinflusste die jahrestypische Stengelzahl die Zahl der Knollenanlagen pro Pflanze positiv (r=+0,77*) und der Knollenanlagen pro Stengel in der Tendenz negativ (r= −0,39). Die signifikanten Jahresunterschiede in der Zahl erntef?higer Knollen (>3 cm) pro Pflanze und pro Stengel wurden
in gewissem Grade durch die Zahl der angelegten Knollen (r= −0,53 bzw. +0,63), in st?rkerem Ausma? jedoch durch die jahrestypische Reduktionsrate der Knollen bestimmt (r= −0,72 bzw. −0,91*). Diese war hoch, wenn ein Wechsel von guter Wasserversorgung w?hrend der Knollenbildung zu Wassermangelsituationen w?hrend
der Knollenwachstumsphase erfolgte.
Summary In seven years of field experiments, there were significant differences in the numbers of stems per plant and the number of harvestable tubers (>3 cm) at maturity, per plant and per stem, averaged for two cultivars and three seed treatments (Table 1). There was only a weakly positive correlation between the typical stem number for each year and the number of harvestable tubers per plant (r= +0.2, Table 2), whilst the correlation with the number of tubers initiated was much closer (r= +0.77*, Table 2). The negative influence of number of stems on number of tubers per stem is shown byr= −0.39 and −0.47 (Table 2). Identical stem populations in the wet, cold spring of 1987, and the warm, dry season of 1983 initiated fewer tubers per stem than in 1989 with its average temperatures and modest precipitation (Table 1). Tuber set per plant and per stem correlated positively with the number of harvested tubers per plant and per stem (r= +0.53 and +0.63) and accounted for some of the yearly variation. A much stronger effect on the number of harvestable tubers came from the annual reduction of tubers (r= −0.72 and −0.91*, Table 2). This was high if the availability of water deteriorated in the period of growth succeeding tuber formation (Table 1, Fig. 1). The same applied to the seed treatments planted at different stages of development. Tuber development occurred earlier with chitted seed, often at times when there was an adequate water supply. A large number of tubers were initiated and these were in large part reduced in the short dry spells which followed (Figs 2 and 4). Irrigation programmes must take account of this relationship.相似文献
35.
36.
37.
Antje Giebel Ole Wendroth Hannes Isaak Reuter Kurt‐Christian Kersebaum Jürgen Schwarz 《植物养料与土壤学杂志》2006,169(1):52-59
Spatial distribution of soil mineral‐N content (Nmin) is a scale‐variant process. Precision farming assumes knowledge about the spatial distribution of Nmin. Moreover, sampling in management zones is based on the assumption of spatial dependence between sampling points. In the present study, variability structure of Nmin and the sources of variability were investigated. Within an agricultural landscape, Nmin was investigated across a field in a nested design over four consecutive years. Temporally unstable structure of individual nests require a sampling with several nests in the field. In the investigated field, 35%–49% of the total variability derived from small‐scale variability observed at spatial distances of <5 m and from sampling and analytical errors. Differences between 10 and 26 kg N ha–1 for the soil depth increment 0–60 cm can be expected. Uncertainty due to analytical errors were in the order of 5–10 kg N ha–1 for a 0–60 cm layer. 相似文献
38.
Sulfur status of selected European forest soils as dependent on the atmospheric S deposition Along a transect from the Pyrenees (SP), over the Vosges Mountains (FR), the Black Forest and the Bavarian Forest (D). and the eastern Ore Mountains to the Iser-Mountains (CR) 10 representative forest soil forms derived from granite regolith and 1 developed from gneiss debris (Dystric Cambisols, Leptic and Ferro-Humic Podzols) at montane and high-montane elevation were analyzed for their concentrations and amounts of total sulfur and various S fractions in order to study the impact of the atmospheric sulfur input, increasing from SW to NE, on the soil sulfur characteristics. Soils receiving low S inputs are generally characterized by low amounts of inorganic (especially water soluble) sulfate. Most of their total S amount consists of organic sulfur. With increasing S deposition, the concentrations of total S and C-S and the ratios St/Corg, C-S/Corg and SO4?Stor/Corg in the L-. Of- and Oh-horizons increase. The Aeh- and Ah-horizons of Cambisols and Podzols under different sulfur load do not differ with regard to the S parameters. The B horizons of the northeastern soils affected by high sulfur deposition, however, are markedly enriched with adsorbed and water-soluble sulfate and show comparably high ratios of sulfate S versus dithionite-extractable iron. 相似文献
39.
Industrial crops provide a possibility for utilization of heavy metal polluted soils. Knowledge of the factors which affect metal uptake by crops is therefore essential in order to develop concepts for the management of such soils. In pot experiments the uptake of Zn by oilseed rape increased considerably with the Zn supply. The increase of Zn uptake was counteracted partly by S. This protective effect of S was, however, not related to Zn retention in the roots. 相似文献
40.