جستجوی مقالات مرتبط با کلیدواژه « احیای زمین » در نشریات گروه « آبخیزداری، بیابان، محیط زیست، مرتع »

Micro-organisms of biological soil crusts have a major role in carbon (C) cycling and atmospheric CO2 removal. Currently, the ability of erodible soils to store atmospheric C is reduced. Thus, we assessed how inoculating soil cyanobacteria onto degraded soil affects C sequestration from the atmosphere. The existing cyanobacteria (Nostoc sp., Oscillatoria sp. and Lyngbya sp.) for the C sequestration were proliferated. They were inoculated on the 40 m2 plots located in degraded land. After 83 (middle of the period) and 172 (end of the period) days, we measured the effect of this inoculation on soil organic C, calculated potential C sequestration, and potential CO2 removal from the atmosphere. The results showed that in the control treatment, the sequestrated carbon in the middle and at the end of the experiment was 0.25 and 0.27 g.m-2.day-1, respectively. Inoculation of cyanobacteria led to a significant increase of 312% and 226% of C sequestration in the middle and end of the experiment, respectively. After 172 days, the rate of C sequestration and removal of CO2 by inoculation of cyanobacteria was estimated to be 3.59 and 13.17 ton.ha-1.year-1, respectively, which was 1.10 and 4.03 ton.ha-1.year-1 in control. The results showed that inoculation of cyanobacteria by hydro-seeding technique before the wet season (early autumn) and at least 1.5 g.m-2 of biomass has the desired effect, and is also approved economically. Eventually, field-scale inoculation of cyanobacteria could be considered as a bio-based tool for sustainable development goals through carbon sequestration and rehabilitation of lands.

This project is about evaluation of groins in Zanjanrood River، which located in Zanjan province with aim the investigation affected groins in control and recovery land use in the buffer river. Therefore، first we study of groin design standards، thus، we compare the executive groins with these standards. The official and field studies show that the executive groins were designed in low risk and most of parameters like length، space and height of groins are over design. This means the costs are high and non economical. The problem was in operation، so that some components in build maps and plans are deferent from executed groins، especially in groin section and groin foundation. The problem is that hard groins in alluvial riverbed are more non-stable and score in head of them are more. Any way in regime condition space between groins and river width adjustment were suitable. In continue the report is about economical analysis. In this state، pure value for each groin and period time of investment and rate of social decreasing was calculated. Then by calculating for relative between benefit to cost the efficiency rate was taken.