. ، soil و erosion…

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نوع زبان: انگلیسی حجم: 6.77 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 37 صفحه
سطح مطلب: نامشخص پسوند فایل: ppsx
گروه موضوعی: زمان استخراج مطلب: 2019/05/17 08:22:10

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

., land, soil, degradation, erosion, module, agriculture, health, river, environment, ecosystem, process,

توجه: این مطلب در تاریخ 2019/05/17 08:22:10 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

http://www.fao.org/fileadmin/templates/cpesap/C-RESAP_Info_package/Links/Module_4.ppsx

در صورتی که محتوای فایل ارائه شده با عنوان مطلب سازگار نبود یا مطلب مذکور خلاف قوانین کشور بود لطفا در بخش دیدگاه (در پایین صفحه) به ما اطلاع دهید تا بعد از بررسی در کوتاه ترین زمان نسبت به حدف با اصلاح آن اقدام نماییم. جهت جستجوی پاورپوینت های بیشتر بر روی اینجا کلیک کنید.

عبارات پرتکرار و مهم در این اسلاید عبارتند از: ., land, soil, degradation, erosion, module, agriculture, health, river, environment, ecosystem, process,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

module ۴ agriculture environment and health ۱ module objectives and structure module ۴. agriculture environment and health objectives and structure objectives this module explores the impacts of agriculture on natural resources human health and ecosystems. we put an emphasis on the deterioration of land productivity but also highlight how this affects ecosystem services which also have a bearing on land productivity. structure given that many factors contribute to the deterioration of land productivity the module opens with a general introduction on land degradation after which different processes that contribute to it are briefly covered. the first half of the module presents processes that mainly lead to depletion of land quality while the second half discusses land degradation due to excesses in particular pollution a form of chemical degradation that not only affects production but also impairs ecosystems and affect human health. we finish by looking at the effects of improper agriculture management on ecosystem services. caveat land degradation processes often do not act individually and affect more than one land component. specific examples are presented for each major process often related to impacts on a single land component but they cannot be taken in isolation. ۲ degradation of agricultural land land degradation impairs the capacity of land to perform ecosystem services and results in loss of productivity socio economic problems food insecurity and migration it costs about us ۴ billion annually worldwide without including hidden costs land degradation is the reduction in the capacity of the land to perform ecosystem services including those of agro ecosystems and urban systems that support society and development. it includes damage or change to soils water bodies vegetation cover and fauna micro macro level through different processes physical—crusting compaction erosion waterlogging depletion of groundwater etc. chemical—acidification leaching salinization pollution etc. biological—changes in biodiversity eutrophication etc. land degradation costs about us ۴ billion annually worldwide without considering hidden costs of increased fertilizer use loss of biodiversity and unique ecosystems. degraded land is costly to reclaim and if severely degraded may no longer be of use. ploughing degraded land in senegal. photo fao seyllou diallo. module ۴. agriculture environment and health introduction to land degradation ۳ drivers of agricultural land degradation growing demand for food has led to intensification of farming and therefore increased use of fertilizer pesticide and machinery over use of inputs is not only wasteful but also damages agricultural products as well as the environment a growing demand for food leads to intensification of farming which if not done through sound practices may lead to land degradation. in addition to intensification other factors can contribute to land degradation including fragmentation of land and differences in management lack of knowledge on environmentally sound technologies reduction of extension services natural disasters lack of incentives to practice environmentally sound agriculture. over use of inputs and lack of appropriate land management practices is not only wasteful but also damages agricultural products as well as the environment and human health. the following slides cover the main types of land degradation. driving force pressure state impact response dpsir framework. more… module ۴. agriculture environment and health introduction to land degradation responses driving forces impacts direct pressures state ۴ land degradation depleting processes module ۴. agriculture environment and health land degradation ۵ soil erosion soil erosion is one of the most widespread forms of land degradation for the farmer soil erosion reduces crop yields and implies more costs for producing food and fibre erosion is the washing or blowing away of surface soil. it is one of the most widespread forms of degradation. when soil vegetation cover is disturbed by cultivation grazing burning or use of heavy machinery soil becomes vulnerable to erosion. erosion accelerates when sloping land is ploughed grass is removed from semiarid land cattle sheep and goats are allowed to overgraze and hillside forests are cut. cropland is at the highest risk of erosion especially if farming systems leave the land bare exposed to wind and water. for the farmer soil erosion reduces crop yields and increases the costs of growing food and fibre by reducing the capacity of the soil to hold water and make that water available to plants washing away plant nutrients and degrading soil structure reducing water infiltration and modifying the terrain. see more… soil erosion in sloping agricultural land in tunisia. photo photolibrary on soil erosion processes. module ۴. agriculture environment and health land degradation ۶ soil erosion examples soil erosion in china the china integrated science survey for soil erosion and ecological security determined that in ۲ ۸ china had ۳.۶ million km۲ of eroded soil. the survey found that almost every valley in every province had soil erosion with ۶۴۶ counties experiencing serious soil erosion of these ۲۲۵ were in the yellow river basin ۷۱ in the hai river basin ۲۴ in the huai river basin. the provinces with more problems were sichuan shanxi gansu inner mongolia and shaanxi. according to chinese experts by ۲ the economic loss from soil erosion was at least cny۲ billion equivalent to ۲.۲۵ of their national gdp. a section of the yellow river in china. each year ۱.۵ billion tonnes of soil flows into the yellow river. sometimes there is so much sediment in the river it looks like chocolate milk. three quarters of this silt ends up in the yellow sea with the remainder settling on the river bed causing the level of the river to rise. source facts and details yellow river basin. photo china digital times. module ۴. agriculture environment and health land degradation ۷ loss of soil structure soil compaction soil compaction is another serious environmental problem with consequences for agricultural production soil compaction increases the risk of crop failure especially under reduced water supply …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: ., land, soil, degradation, erosion, module, agriculture, health, river, environment, ecosystem, process,

این فایل پاورپوینت شامل 37 اسلاید و به زبان انگلیسی و حجم آن 6.77 مگا بایت است. نوع قالب فایل ppsx بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/05/17 08:22:10 استخراج شده است.

http://www.fao.org/fileadmin/templates/cpesap/C-RESAP_Info_package/Links/Module_4.ppsx

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