Shahid Beheshti University Advanced Environmental Sciences 3115-7173 8 1 2010 09 23 Estimation of Organic Matter Losses in a Hyrcanian EcosystemA Case Study of Kojor Watershed Estimation of Organic Matter Losses in a Hyrcanian EcosystemA Case Study of Kojor Watershed 94588 FA Hamze Noor PhD. . Student in Watershed Management Engineering, Tarbiat Modares University. Seyed Khalagh Mirnia Department of Watershed Management Engineering, Faculty of Natural Resources, Tarbiat Modares University. Mohammad Bagher Raisi MSc. Student Department of Watershed Management Engineering, Faculty of Natural Resources, Tarbiat Modares University. Journal Article 2015 05 17 <span style="left: 126.4px; top: 683.067px; font-size: 10.56px; font-family: serif; transform: scaleX(1.12591);" dir="ltr">The aim of the present study was to predict organic </span><span style="left: 126.4px; top: 699.067px; font-size: 10.56px; font-family: serif; transform: scaleX(1.1997);" dir="ltr">matter (OM) loss in Kojor Watershed which is a </span><span style="left: 126.4px; top: 715.067px; font-size: 10.56px; font-family: serif; transform: scaleX(1.13716);" dir="ltr">hyrcanian ecosystem. For this purpose, discharges, </span><span style="left: 126.4px; top: 731.067px; font-size: 10.56px; font-family: serif; transform: scaleX(1.08107);" dir="ltr">suspended sediment (SS) and OM loss resulting from </span><span style="left: 126.4px; top: 747.067px; font-size: 10.56px; font-family: serif; transform: scaleX(1.01346);" dir="ltr">storm events were sampled at one fixed point of the river </span><span style="left: 126.4px; top: 763.067px; font-size: 10.56px; font-family: serif; transform: scaleX(1.01388);" dir="ltr">using a manual sampler. Results showed that soil erosion </span><span style="left: 126.4px; top: 778.747px; font-size: 10.56px; font-family: serif; transform: scaleX(1.1548);" dir="ltr">rate during the sampling period were dramatically </span><span style="left: 126.4px; top: 794.747px; font-size: 10.56px; font-family: serif; transform: scaleX(1.01575);" dir="ltr">affected by the loss of OM. Also, the results of modeling </span><span style="left: 126.4px; top: 810.747px; font-size: 10.56px; font-family: serif; transform: scaleX(1.02247);" dir="ltr">among OM loss, SS and discharge indicate that OM loss </span><span style="left: 126.4px; top: 826.747px; font-size: 10.56px; font-family: serif; transform: scaleX(1.1731);" dir="ltr">was not estimated by the discharge, while SS can </span><span style="left: 126.4px; top: 842.747px; font-size: 10.56px; font-family: serif; transform: scaleX(1.02383);" dir="ltr">estimate the loss of OM with a determination coefficient </span><span style="left: 126.4px; top: 858.747px; font-size: 10.56px; font-family: serif; transform: scaleX(1.07033);" dir="ltr">and estimation error of of 95% and 24%, respectively. </span><span style="left: 126.4px; top: 874.427px; font-size: 10.56px; font-family: serif; transform: scaleX(1.0337);" dir="ltr">These results could facilitate the application of methods </span><span style="left: 126.4px; top: 890.427px; font-size: 10.56px; font-family: serif; transform: scaleX(1.04225);" dir="ltr">obtained in the present study to other areas with similar </span><span style="left: 126.4px; top: 906.427px; font-size: 10.56px; font-family: serif; transform: scaleX(1.01258);" dir="ltr">conditions.</span> <span style="left: 126.4px; top: 683.067px; font-size: 10.56px; font-family: serif; transform: scaleX(1.12591);" dir="ltr">The aim of the present study was to predict organic </span><span style="left: 126.4px; top: 699.067px; font-size: 10.56px; font-family: serif; transform: scaleX(1.1997);" dir="ltr">matter (OM) loss in Kojor Watershed which is a </span><span style="left: 126.4px; top: 715.067px; font-size: 10.56px; font-family: serif; transform: scaleX(1.13716);" dir="ltr">hyrcanian ecosystem. For this purpose, discharges, </span><span style="left: 126.4px; top: 731.067px; font-size: 10.56px; font-family: serif; transform: scaleX(1.08107);" dir="ltr">suspended sediment (SS) and OM loss resulting from </span><span style="left: 126.4px; top: 747.067px; font-size: 10.56px; font-family: serif; transform: scaleX(1.01346);" dir="ltr">storm events were sampled at one fixed point of the river </span><span style="left: 126.4px; top: 763.067px; font-size: 10.56px; font-family: serif; transform: scaleX(1.01388);" dir="ltr">using a manual sampler. Results showed that soil erosion </span><span style="left: 126.4px; top: 778.747px; font-size: 10.56px; font-family: serif; transform: scaleX(1.1548);" dir="ltr">rate during the sampling period were dramatically </span><span style="left: 126.4px; top: 794.747px; font-size: 10.56px; font-family: serif; transform: scaleX(1.01575);" dir="ltr">affected by the loss of OM. Also, the results of modeling </span><span style="left: 126.4px; top: 810.747px; font-size: 10.56px; font-family: serif; transform: scaleX(1.02247);" dir="ltr">among OM loss, SS and discharge indicate that OM loss </span><span style="left: 126.4px; top: 826.747px; font-size: 10.56px; font-family: serif; transform: scaleX(1.1731);" dir="ltr">was not estimated by the discharge, while SS can </span><span style="left: 126.4px; top: 842.747px; font-size: 10.56px; font-family: serif; transform: scaleX(1.02383);" dir="ltr">estimate the loss of OM with a determination coefficient </span><span style="left: 126.4px; top: 858.747px; font-size: 10.56px; font-family: serif; transform: scaleX(1.07033);" dir="ltr">and estimation error of of 95% and 24%, respectively. </span><span style="left: 126.4px; top: 874.427px; font-size: 10.56px; font-family: serif; transform: scaleX(1.0337);" dir="ltr">These results could facilitate the application of methods </span><span style="left: 126.4px; top: 890.427px; font-size: 10.56px; font-family: serif; transform: scaleX(1.04225);" dir="ltr">obtained in the present study to other areas with similar </span><span style="left: 126.4px; top: 906.427px; font-size: 10.56px; font-family: serif; transform: scaleX(1.01258);" dir="ltr">conditions.</span> https://envs.sbu.ac.ir/article_94588_e36f09dea4ccc0ef893ed74be94f245c.pdf