influence of pasture and rainfed agriculture land uses on soil loss in dojag-chay subwatershed (ardabil province- nw iran)

نویسندگان

r. talaei

a. jafari ardakani

f. azimi

r. bayat

m. parehkar

چکیده

one of the main resonator factors in watershed soil erosion is inappropriateland management including conversion of pasture land to dry-land farming.unfortunately, the changes of gara su watershed usages have been very common.thus, in order to understand the influence of land use on runoff rate and soil loss, soillosses were investigated and determined under both pasture and dry-land agriculturesat sub-watershed of dojag chay in southern west qara su basin (within ardebilprovince). in this research, using a drop maker rainfall simulator device, 18treatments under the said watershed were conducted using an artificial rain with theintensity of 6 mm/ min for 6 minutes and soil loss rate was measured due to therainfall in two user types in dry-land and rangeland under natural humidity conditionsand approximately the same as the raining season in three slope classes of 5 to 12, 12to 20 and greater than 20. the results showed that with the cultivation, cultivatedsoils get empty and their porosity and permeability increase so, with the increase ofwater penetration ability, their runoff compared to the pasture lands starts with delay.comparing the amount of runoff shows that after runoff gets started in rain-fedagriculture lands, the flowing speed and amount of water become more than those ofpasture lands and the statistical analysis also verified the significant relationship,especially in slopes of more than 20% between the amount of soil loss and land use.the soil loss under rain-fed agriculture was 8.8 times more than the pasture. as thesoil loss was compared for different slope classes of 5-12, 12-20, and more than 20slope percent, the results indicated that the soil losses under rain-fed agriculture were4.5, 5.6, and 12 times more than the pasture. the study results, therefore, can beutilized for proper management of area through devoting necessary attention intoland uses.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Influence of Pasture and Rainfed Agriculture Land Uses on Soil Loss in Dojag-Chay Subwatershed (Ardabil Province- NW Iran)

One of the main resonator factors in watershed soil erosion is inappropriateland management including conversion of pasture land to dry-land farming.Unfortunately, the changes of Gara Su watershed usages have been very common.Thus, in order to understand the influence of land use on runoff rate and soil loss, soillosses were investigated and determined under both pasture and dry-land agricultur...

متن کامل

Soil loss and runoff generation in rangeland, rain-fed and abandoned rain-fed agriculture land-uses under simulated rainfall

Soil erosion is a global challenge, seriously threatening soil and water resources andenvironmental qualities. One of the important factors to consider in the process of runoffgeneration and soil erosion is the physical and chemical properties of soils under differentland-uses. The aim of this study is to estimate soil erosion and runoff in rangeland, rain-fedand abandoned rain-fed agriculture ...

متن کامل

Effect of Slope Gradient and Soil Physical Properties on Soil Loss in Furrows of Rainfed Farms

This study was conducted to investigate the effect of slope gradient and soil physical properties (grain size distribution, bulk density, aggregate stability and permeability) on water erosion in the furrows of rainfed farms under fallow conditions. The furrows with 6 m length were installed in five rainfed farms with 6.1, 10.6, 14.8, 20.7 and 27.1% slope steepness at three replications. Resul...

متن کامل

Determination of Main Agents Affecting Soil Erosion in Rainfed Land of Kermanshah Province Using Rainfall Simulator

In recent decades, low-yielding rainfed farms have become known as the main sources of sediment production and soil erosion in the country. Therefore, more research is needed on the factors affecting erosion and sediment production in these areas. This research was carried out with the aim of studying the effects of slope and rainfall intensity on erosion between rainbow trout in test farms in ...

متن کامل

Epidemiological study of snakebites in Ardabil Province (Iran)

INTRODUCTION Average annual incidence of snakebite worldwide is between 5.5 to 1.2 million, and at least 125,000 of them are fatal. In Iran, around 4,500-11,000 snakebites occur annually, and a small number of them are fatal. Snake bites can cause intoxity and immediate death in patients, and the aim of this study was to investigate the epidemiological study of snakebites in Ardabil Province. ...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
journal of rangeland science

ناشر: islamic azad university, boroujerd branch

ISSN 2008-9996

دوره 1

شماره 2 2011

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023