نتایج جستجو برای: global hectares

تعداد نتایج: 450171  

Journal: :Ecological applications : a publication of the Ecological Society of America 2016
T Trevor Caughlin Stephen Elliott Jeremy W Lichstein

Restoring forest to hundreds of millions of hectares of degraded land has become a centerpiece of international plans to sequester carbon and conserve biodiversity. Forest landscape restoration will require scaling up ecological knowledge of secondary succession from small-scale field studies to predict forest recovery rates in heterogeneous landscapes. However, ecological field studies reveal ...

Journal: :Environment international 2005
R Lal

Reducing and off-setting anthropogenic emissions of CO(2) and other greenhouse gases (GHGs) are important strategies of mitigating the greenhouse effect. Thus, the need for developing carbon (C) neutral and renewable sources of energy is more than ever before. Use of crop residue as a possible source of feedstock for bioenergy production must be critically and objectively assessed because of it...

2013
Laura K. Marsh Víctor Arroyo-Rodríguez Michael D. Wasserman

In 2010, the Food and Agriculture Organization of the United Nations (FAO) estimated that 16 million hectares of forest per year were lost globally in the 1990s ( FAO 2010 ), and approximately 12.5 million hectares/year were lost in countries with primate populations, an area just smaller than Greece or the US State of Mississippi (Chapman and Peres 2001 ; Chapman and Gogarten 2012 ). In contra...

Journal: :مرتع و آبخیزداری 0
طیبه مصباح زاده دانشجوی دکتری بیابانزایی، دانشکده منابع طبیعی،دانشگاه تهران ،ایران حسن احمدی استاد گروه احیای مناطق خشک وکوهستانی ، دانشکده منابع طبیعی،دانشگاه تهران ،ایران غلامرضا زهتابیان استاد گروه احیای مناطق خشک وکوهستانی ، دانشکده منابع طبیعی،دانشگاه تهران ،ایران فریدون سرمدیان استادیار گروه مهندسی آب وخاک، دانشکده مهندسی آ ب وخاک، دانشگاه تهران ،ایران

investigation and preparing of wind erosion intensity maps are the main objectives of this research. in this research, the working unit map was prepared and then nine effective factors in wind erosion according to irifr.e.a model are determined at each of seven homogeneous units. according to the results, active sand dunes and landuse change showed the highest value with the rate of annual sedi...

Journal: :جغرافیا و توسعه ناحیه ای 0
ولایتی ولایتی کدیور کدیور

the growth of industries during the industrialization and after the industrial revolution has caused environmental problems all around the world; specifically in industrial countries. in spite of having high technology, industrial countries have not been able to solve the problem of environmental pollution. even meetings and conferences such as those held in stockholm and johannesburg have not ...

2015
Muhammad Aamir Iqbal Bilal Ahmad Muhammad Hussnain Shah Kashif Ali

Forage sorghum is considered to be the most heat and drought resistant summer forage with a fairly high green forage yield. Forage sorghum is more economical to grow as compared to forage maize with fairly high economic returns. The total area under forages in 2012 in Punjab was 1.82 million hectares with green forage production of 38.8 million tons. The land area of Punjab under forage sorghum...

2017
Peter M. Gresshoff Brett J. Ferguson

Our world is facing major problems relating to food production. According to an August 30, 2015 program of LANDLINE (Australian Broadcasting Corporation, Australia),we lose 120,000,000 hectares of agricultural land per year due to population growth, associated urbanisation, and desertification.

2015
Mustafa Mutlu Uysal Murat Uysal

Original scientific paper In this study, the change in city growth of Afyonkarahisar in the adjacent area in the future was estimated using the SLEUTH model. The main objective of this study is to show the simulation of the change in the urban growth of Afyonkarahisar until 2030 with the SLEUTH model, a cellular automata model. For this purpose, two different growth scenarios have been develope...

2017
Chris J Mcowen Lauren V Weatherdon Jan-Willem Van Bochove Emma Sullivan Simon Blyth Christoph Zockler Damon Stanwell-Smith Naomi Kingston Corinne S Martin Mark Spalding Steven Fletcher

BACKGROUND Saltmarshes are extremely valuable but often overlooked ecosystems, contributing to livelihoods locally and globally through the associated ecosystem services they provide, including fish production, carbon storage and coastal protection. Despite their importance, knowledge of the current spatial distribution (occurrence and extent) of saltmarshes is incomplete. In light of increasin...

Journal: :international journal of agricultural management and development 0
khadijeh abolfathi m.sc. student in assessment and land use planning, natural resources and environmental engineering department, faculty of agricultural science, payame noor university (pnu), tehran, iran marzieh alikhah-asl assistant professor, natural resources and environmental engineering, faculty of agricultural science, payame noor university (pnu), tehran, iran mohammad rezvani assistant professor, natural resources and environmental engineering, faculty of agricultural science, payame noor university (pnu), tehran, iran mohammad namdar forest, rangeland and watershed management organization, tehran, iran

the growing population and increasing socio-economic necessities creates a pressure on land use/land cover. nowadays, land use change detection using remote sensing data provides quantitative and timely information for management and evaluation of natural resources. this study investigates the land use changes in part of hableh rood watershed of iran using landsat 7 and 8 (sensor etm+ and oli) ...

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