نتایج جستجو برای: overgrazing

تعداد نتایج: 517  

Journal: :Diversity 2022

In the last several decades, overgrazing has led to various changes in plant communities, soil nutrients and microbial communities alpine Kobresia meadows, which contain coexisting on Qinghai–Tibet Plateau. Investigating variations biomass concentration of plant–soil system these may improve understanding biochemical responses adaptation strategies they use resist disturbances due overgrazing. ...

Journal: :Global change biology 2014
Thomas Hilker Enkhjargal Natsagdorj Richard H Waring Alexei Lyapustin Yujie Wang

The Mongolian Steppe is one of the largest remaining grassland ecosystems. Recent studies have reported widespread decline of vegetation across the steppe and about 70% of this ecosystem is now considered degraded. Among the scientific community there has been an active debate about whether the observed degradation is related to climate, or over-grazing, or both. Here, we employ a new atmospher...

Journal: :Proceedings. Biological sciences 2014
Marjolijn J A Christianen Peter M J Herman Tjeerd J Bouma Leon P M Lamers Marieke M van Katwijk Tjisse van der Heide Peter J Mumby Brian R Silliman Sarah L Engelhard Madelon van de Kerk Wawan Kiswara Johan van de Koppel

Marine protected areas (MPAs) are key tools for combatting the global overexploitation of endangered species. The prevailing paradigm is that MPAs are beneficial in helping to restore ecosystems to more 'natural' conditions. However, MPAs may have unintended negative effects when increasing densities of protected species exert destructive effects on their habitat. Here, we report on severe seag...

Journal: :محیط زیست طبیعی 0
سعید محمدی دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، گروه علوم محیط زیست، تهران، ایران محمد کابلی استادیار دانشکده منابع طبیعی، دانشگاه تهران، ایران محمود کرمی استاد دانشکده منابع طبیعی، دانشگاه تهران، ایران افشین علیزاده شعبانی استادیار دانشکده منابع طبیعی، دانشگاه تهران، ایران میترا شریعتی نجف آبادی کارشناس ارشد محیط زیست، دانشکده منابع طبیعی، دانشگاه تهران، ایران

iranian jerboa classified as data deficient species according to the iucn red list. little information has been published about ecological and biological characteristics of allactaga firouzi and other members of genus allactaga. in the present study, we aimed to identify some ecological characteristics, such as: hibernation, feeding habits, breeding, coexistence with other rodents and threateni...

Journal: :E3S web of conferences 2023

In this article are examined the issues of preserving natural environment Altai Republic in context agro-industrial complex development. It is shown that agriculture played a leading role economy region both Soviet and post-Soviet periods. The main factors impact on associated with fencing maral nurseries, arable lands hay lands, and, accordingly, violation migration routes ungulates. chemicali...

ژورنال: علوم آب و خاک 2012
فایز رئیسی, , مریم ریاحی, ,

Mountainous landscapes in Central Zagros are mainly used as grazing rangelands to feed animals and are heavily degraded. Overgrazing may impose a negative effect on rangeland productivity and sustainability through significant changes in soil properties. Soil nitrogen (N) mineralization is one of the key biological processes that might be affected by biotic and abiotic factors including range g...

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