in this study, some habitat characteristics of iranian rose (hulthemia persica) were studied in gonbad watershed in hamedan providence, iran. soil samples were taken by a systematic randomized method at elevation 2000-2400 m above sea level. samples were taken from 0-30 cm depth. in the laboratory, n, p, k% and organic matter (oc%), soil acidity (ph), conductivity (ec) and soil texture were det...

Introduction Conclusions References

Tillage systems and nutrient management influence soil chemical properties that can impact the long-term sustainability of dryland production systems. This study was conducted to compare the effects of no-till (NT) and conventional till (CT) on the soil chemical properties and grain yield of a dryland winter wheat (Triticum aestivum L.)– grain sorghum [Sorghum bicolor (L.) Moench]/corn (Zea may...

Two-component hydrograph separation using oxygen-18 concentrations was conducted at a sediment runoff observation weir installed in a small subcatchment of a forested gneiss catchment in Japan. The mean soil thickness of this catchment is 7.27 m, which comprises 3.29 m of brown forest soil (A and B layers) and a 3.98-m layer of heavily weathered gneiss. Data were collected for a storm on 20–21 ...

Past research has demonstrated the potential of mapping soil moisture using both low frequency passive and active microwave measurements (e.g. Jackson et al., 1999; Wagner & Scipal, 2000). This resulted in formulating satellite missions carrying L-band microwave sensors capable of monitoring soil moisture globally. For example, a microwave radiometer has recently been launched by European Space...

et al. (1991), and has since been utilized by several researchers (Tarara and Ham, 1997; Ren et al., 1999; The dual-probe heat-pulse (DPHP) technique is emerging as a Song et al., 1999; Campbell et al., 2002). These studies useful technique for measuring soil volumetric water content ( ). have shown that the DPHP technique can provide accuHowever, few published data are available regarding the ...

The results of field survey, germination and correspondence analysis showed that the soil seed banks density ranged from 900 to 6,467 seeds m at 0-5 cm depth and 117 to 2,467 seeds m at 5-10 cm depth, with species richness of 7-14. Early successional species dominated the soil seed bank, while later successional species occurred only at low density. The similarity between soil seed bank and sta...