نتایج جستجو برای: farmland fragmentation

تعداد نتایج: 38625  

Journal: :Mammalian Biology 2021

Abstract The garden dormouse Eliomys quercinus has been declining in both abundance and range since the mid-twentieth century. eastern edge of its contracted from Ural Mountains to Germany. Habitat loss fragmentation most supported theory explain observed decline. Climate change implicated declines other terrestrial mammals, but not investigated for E. . To better understand factors influencing...

2013
Lei Deng Zhou-Ping Shangguan Sandra Sweeney

The revegetation of abandoned farmland significantly influences soil organic C (SOC) and total N (TN). However, the dynamics of both soil OC and N storage following the abandonment of farmland are not well understood. To learn more about soil C and N storages dynamics 30 years after the conversion of farmland to grassland, we measured SOC and TN content in paired grassland and farmland sites in...

Journal: :Land 2022

The diseconomies of scale found in smallholders’ agricultural production is a common problem faced by global development. Notable examples regions which this occurs include Central and Eastern Europe, India, Brazil, China. Smallholders usually differ their demands for socialized services due to scattered farmland, various soil conditions, different selections crop varieties, diverse farming arr...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه محقق اردبیلی - دانشکده علوم 1388

: بر اساس تحقیقات صورت گرفته، ترکیبات گیاهی دارای اثرات فارماکولوژی و دارویی فراوانی هستند. در این تحقیق، پودر ریشه گیاه prangos uloptera با دستگاه سوکسیله، توسط حلال های n-hexan، dichloromethan و methanol عصاره گیری شد. عصاره متانولی درفشارپایین ودردمای o45 سانتی گراد قرارگرفت تانهایتا یک ماده صمغی شکل مشاهده شد. بخشی از این ماده به وسیله کارتریج spe-c 18 و با استفاده از محلول هایی با غلطت ها...

2017
Ying Liu Chenggang Wang Zeng Tang Zhibiao Nan

The rapid growth of farmland rental markets in China raises questions about the association of farmland rental and agricultural productivity. Although this issue has been extensively studied, the majority of studies have focused on yields and technical efficiency, with input use and cost efficiency receiving little attention. This study aimed to determine the statistical association of wheat an...

2017
Renhuan Zhu Zicheng Zheng Tingxuan Li Xizhou Zhang Shuqin He Yongdong Wang Tao Liu Wei Li

Climate warming and land use change are some of the drivers affecting soil organic carbon (SOC) dynamics. The Grain for Green Project, local natural resources, and geographical conditions have resulted in farmland conversion into tea plantations in the hilly region of Western Sichuan. However, the effect of such land conversion on SOC mineralization remains unknown. In order to understand the t...

2013
João Lopes Guilherme Henrique Miguel Pereira

Widespread farmland abandonment has led to significant landscape transformations of many European mountain areas. These semi-natural multi-habitat landscapes are important reservoirs of biodiversity and their abandonment has important conservation implications. In multi-habitat landscapes the adaptation of communities depends on the differential affinity of the species to the available habitats...

2001
Cynthia J. Nickerson Lori Lynch

Government agencies in urbanizing areas are increasingly utilizing purchase and transfer of development rights programs to preserve farmland and protect local farm economies.This article tests the effect of development restrictions imposed by permanent easement sales on farmland sales prices, using Maryland data. We correct for selectivity bias due to the voluntary nature of these programs in e...

2015
Michael Glemnitz Peter Zander Ulrich Stachow

The environmental impacts of land use vary regionally. Differences in geomorphology, climate, landscape structure, and biotope inventories are regarded as the main causes of this variation. We present a methodological approach for identifying regional responses in land use type to large-scale changes and the implications for the provision of habitat for farmland birds. The methodological innova...

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