effect of land use change and overgrazing on runoff, sediment and soil phosphorus losses in the soolegan watershed
نویسندگان
چکیده
the discharge of total suspended sediments (tss) and dissolved nutrients from watersheds into receiving waters is a serious problem when natural vegetation is degraded by agriculture or overgrazing. this study was conducted in soolegan watershed to investigate land use change and overgrazing effects on phosphorus loss (dissolved & particulate), particle size associated loss of p and effect of time of rainfall on total dissolved p concentration in runoff. much higher runoff, sediment and nutrient losses observed under cultivated land and hdp (high degraded pasture) than those under mdp (moderately degraded pasture). contribution of particulate phosphorus exported from micro plot via surface runoff was increased by decreasing plant cover. largest amount of dissolved phosphorus loss measured in hdp (16.4 mg/m2) and particulate p loss in cultivated land (301.3 mg/m2). concentration of total dissolved phosphorus (tdp) in runoff was significantly (p
منابع مشابه
the effect of oxytetracycline on serum calcium, phosphorus and magnesium in cattle
نتایج این مطالعه نشان می دهد که مقدار کلسیم (یونیزه و تام)، منیزیم و فسفر به طور معنی داری تغییر پیدا کرد به جزء مقدار کلسیم تام و منیزیم در روش داخل عضلانی که تغییر معنی داری نداشته است. بر اساس نتایج این مطالعه می توان نتیجه گیری کرد که اکسی تتراساکلین بر روی مقادیر سرمی کلسیم و منیزیم تأثیر می گذارد باید مقدار این کاتیون ها در بیماران، در هنگامی که اکسی تتراسایکلین استفاده می شود مورد توجه ق...
15 صفحه اولRunoff losses of suspended sediment, nitrogen, and phosphorus from a small watershed in Korea.
Nutrients and sediments in runoff lead to the degradation of water quality of lakes and streams. The development of schemes to mitigate such degradation requires a characterization of the underlying transport processes. The objectives of this study were to develop annual and seasonal load-discharge relationships for suspended sediment (SS), total nitrogen (TN), and total phosphorus (TP) losses ...
متن کاملEffect of soil erosion on available phosphorus losses in a Hyrcanian watershed
One of the most important main environmental problems is soil erosion and its affects. Eutrophication, low oxygen levels and `high nutrient (nitrogen and phosphorus) concentrations in reservoirs, channel and other water courses, is a common water pollution feature. Phosphorus (P) is one of the major plant nutrients and also the major nutrients controlling eutrophication of surface water. The ai...
متن کاملInvestigating Land Use and Slope Effects on Soil Properties, Runoff and Sediment Using Rainfall Simulator Case Study of Kechik Watershed in Golestan Province
INTRODUCTION Soil erosion and its issues are among the most important environmental challenges. In many areas, soil erosion affected valuable natural resources and soil fertility. The recognition of the factors affecting runoff and soil erosion, and the determination of their issues are essential for soil and water management conducive to sustainable development. The assessment and analysi...
متن کاملInvestigation of the Effects of Land use Change on Flooding and Sedimentation In Honifaqan Watershed
In a natural ecosystem, land exploitation and change in environmental conditions, particularly changes in vegetation and land use effects on hydrological responses such as floods and erosion and sediment and ultimately causing heavy social-economic losses. Then, prediction of effect of land use changes on flood situation in the future decades and sedimentation of watersheds will be the way to d...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
مرتع و آبخیزداریجلد ۶۲، شماره ۱، صفحات ۱۳۷-۱۵۳
کلمات کلیدی
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023