جستجوی مقالات مرتبط با کلیدواژه "plant production" در نشریات گروه "آبخیزداری، بیابان، محیط زیست، مرتع"

One of the common and growing perspectives on achieving sustainability is to formulate its indicators based on local data alongside with a guided and experimental approach. On this basis, designing and prioritization of rangeland sustainability indicators from the experts perspectives in the nomadic rangelands of Kham Namdan in Eghlid county, Robat Sarvestan and Dogush Naderi of Khanj county were done. These three regions were considered as the representatives of seasonal nomadic rangelands, cold, temperate and warm, of Fars province, respectively. In this study, multivariate decision-making methods, fuzzy Delphi, hierarchical analysis (AHP) and TOPSIS method were used. The questionnaire criteria were divided into four categoris: climate and meteorology, crop production, soil and anthropogenic. Analysis of the results at the level of indices showed that anthropogenic and soil indices with a weight of 0.480 and 0.330 were the highest, respectively, and crop production and climate and hydrological indices with relative weights of 0.134 and 0.056 were fallen in the next rank. At the level of options or criteria, all unapproved options were related to the anthropogenic index, while in the indicators of climate and hydrology, crop production and soil, all options were approved by experts. Paired comparison of the options also shows that the options of income and capital, ownership and types of visible soil erosion with relative weights of 0.16, 0.13 and 0.11 have the highest priority. On the contrary, for drought index, average annual temperature and access to alternative forage with relative weights less than 0.005 have the lowest priority. The results of TOPSIS method showed that options: finance (income, savings, loans and insurance), ownership (land, livestock, housing and car) and types of erosion are superior to other options.

The present study was conducted to improve root, shoots growth, and seedling quality index of milkweed (Calotropis procera) using biopriming bacteria Pseudomonas putida (Trevisan) strain 169. An experiment was performed with two levels of inoculum including control and rhizospheric bacteria and three growth periods of one, two, and three months, using a factorial experiment in a completely randomized design with five replications. Biopriming results showed that seedlings obtained from bacterial priming in one-month, two-month, and three-month periods compared to the control, increased 707.5, 1823.1 and 47.6% in root volume; 654.6, 1798.6 and 40.3% in root area; 270.6, 38.5, and 6.6% in fresh weight of stem and 58.5, 19.3 and 2.5% in seedling height, respectively. The highest value of the quality index was observed in seedlings inoculated with the bacterium in the third month. The results of Pearson correlation showed that the parameters of aerial parts such as height, collar diameter, and stem weight were significantly correlated with each other, except root length and root dry weight. Results revealed that the priming of rhizosphere bacteria used in this study had a positive effect on improving the growth parameters of milkweed seedlings. Therefore, it is suggested that more research be done on the coexistence of rhizosphere bacteria in different plants and the interaction of their effects so that this technique can be used more for plant production and desertification.

Quantitative and qualitative characteristics of the suspended load may affect soil and vegetation. After drawing an area map, soil and vegetation were examined at both floodwater spreaders and control areas. The soil was sampled and examined by chemical analysis as three-factor randomized complete block design including condition of basin, distance and proximity to the banks, depth of soil 0–20 cm and 20–60 cm in triplicate. Condition, trends and plant production in two stages (before and after floodwater spreading) were studied by the four-factors method, trend balance and clipping and weighing, respectively. Results showed that spate irrigation affected soil sodium absorption ratio (SAR), sodium, calcium and CaCo3 with a significant increase compared to control in all three phases of soil texture became heaveier in some localities. SAR significantly increased with depth. An Increase in EC and SAR caused little salinity and sodicity, respectively. The rangeland condition, which was poor prior to spate irrigation (40 kg dry matter per hectare per year), and Showing a negative trend, improved to the intermediate category, it was with a positive trend and production of 110 kg dry matter per hectare per year after spate irrigation.

Study on plant vegetation changes has many applications for range improvement and range management. Plant vegetation percentage, production and composition were studied over fouryears in a17-year exclusion area and a grazing area in Golestan Research Station in Mashhad City. Soil organic matter content of both areas was measured at 0-30 cm soil depth. Plant composition was determined by identifying the perennial species. Vegetation percentage and plant production were estimated using quadrate and clipping method, respectively. In general, plant vegetation percentage and plant production were higher in exclusion area as compared with grazing area; however, this increase was not statistically significant in some years. Plant vegetation composition also showed some differences, but the changes seemed to be low during the exclusion period. Organic matter percentage was calculated to be 0.57 and 0.54 for exclusion and grazing areas, respectively. In conclusion, in the areas with similar climatic condition, range exclusion will not result in large changes in plant composition and vegetation percentage for fodder production or creating green space.