نتایج جستجو برای: grassland

تعداد نتایج: 10371  

Journal: :Remote Sensing 2014
Jiangzhou Xia Shuguang Liu Shunlin Liang Yang Chen Wenfang Xu Wenping Yuan

Grassland ecosystems play an important role in subsistence agriculture and the global carbon cycle. However, the global spatio-temporal patterns and environmental controls of grassland biomass are not well quantified and understood. The goal of this study was to estimate the spatial and temporal patterns of the global grassland biomass and analyze their driving forces using field measurements, ...

Journal: :Environmental management 2007
Stephanie A Snyder James R Miller Adam M Skibbe Robert G Haight

Habitat protection for grassland birds is an important component of open space land acquisition in suburban Chicago. We use optimization decision models to develop recommendations for land protection and analyze tradeoffs between alternative goals. One goal is to acquire (and restore if necessary) as much grassland habitat as possible for a given budget. Because a viable habitat for grassland b...

2011
P. Stypinski

Grassland is the first land use in the agricultural areas (AA) of Europe, covering, with rangeland, 56 million ha (33% of AA in EU). Grasslands are characterized by multiple functions and values but one of the most important is forage production for ruminants. In the “grassland region” milk production is connected with grassland management and proper utilisation, whereas in other parts of Europ...

2017
Conor J Strong Niall G Burnside Dan Llewellyn

The loss of unimproved grassland has led to species decline in a wide range of taxonomic groups. Agricultural intensification has resulted in fragmented patches of remnant grassland habitat both across Europe and internationally. The monitoring of remnant patches of this habitat is critically important, however, traditional surveying of large, remote landscapes is a notoriously costly and diffi...

2016
Jinfeng Chang Philippe Ciais Mario Herrero Petr Havlik Matteo Campioli Xianzhou Zhang Yongfei Bai Nicolas Viovy Joanna Joiner Xuhui Wang Shushi Peng Chao Yue Shilong Piao Tao Wang Didier A. Hauglustaine Jean-Francois Soussana Anna Peregon Natalya Kosykh Nina Mironycheva-Tokareva

Grassland management type (grazed or mown) and intensity (intensive or extensive) play a crucial role in the greenhouse gas balance and surface energy budget of this biome, both at field scale and at large spatial scale. However, global gridded historical information on grassland management intensity is not available. Combining modelled grass-biomass productivity with statistics of the grassbio...

Journal: :Environmental monitoring and assessment 2015
Chunyang He Jie Tian Bin Gao Yuanyuan Zhao

Quantitatively distinguishing grassland degradation due to climatic variations from that due to human activities is of great significance to effectively governing degraded grassland and realizing sustainable utilization. The objective of this study was to differentiate these two types of drivers in the Liao River Basin during 1999-2009 using the residual trend (RESTREND) method and to evaluate ...

2012
Bruce A. roBertson roBert A. rice christine A. riBic Bruce A. BABcock DouglAs A. lAnDis roBert J. Fletcher Joseph J. FontAine pAtrick J. DorAn DouglAs W. schemske

In the United States, government-mandated growth in the production of crops dedicated to biofuel (agrofuels) is predicted to increase the demands on existing agricultural lands, potentially threatening the persistence of populations of grassland birds they support. We review recently published literature and datasets to (1) examine the ability of alternative agrofuel crops and their management ...

2004
Michelle S. Lett Alan K. Knapp John M. Briggs John M. Blair

The clonal shrub Cornus drummondii C.A. Mey. is rapidly increasing in cover and displacing mesic grassland species in the central USA as a consequence of fire suppression. We assessed the impact of C. drummondii on carbon (C) and nitrogen (N) pools and C fluxes in a tallgrass prairie in eastern Kansas, USA, through a comparison of both burned and unburned C. drummondii islands with open grassla...

Journal: :Canadian journal of microbiology 2006
Nabla Kennedy Eoin Brodie John Connolly Nicholas Clipson

Seasonal and management influences on the fungal community structure of two upland grassland soils were investigated. An upland site containing both unimproved floristically diverse (U4a) and improved mesotrophic (MG7b) grassland types was selected. Samples from both grassland types were taken at five times in one year. Soil fungal community structure was assessed using fungal automated ribosom...

2016
Shuli Liu Fawei Zhang Yangong Du Xiaowei Guo Li Lin Yikang Li Qian Li Guangmin Cao

The alpine grassland ecosystem can sequester a large quantity of carbon, yet its significance remains controversial owing to large uncertainties in the relative contributions of climate factors and grazing intensity. In this study we surveyed 115 sites to measure ecosystem carbon storage (both biomass and soil) in alpine grassland over the Qinghai Plateau during the peak growing season in 2011 ...

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