搜索结果: 1-15 共查到“农学总论 change”相关记录61条 . 查询时间(0.062 秒)
植被是陆地生态系统的重要组成部分，在全球变化碳循环研究中扮演着重要的角色。物候变化和碳循环年际变化密切相关，是全球变化领域的一个研究热点。现有物候变化研究大多关注植被春季物候变化，如展叶期、开花期等，对秋季物候变化的机制分析略显滞后。中科院地理资源所吴朝阳研究员、葛全胜研究员等联合美国、欧洲国家的全球变化领域专家开展了北半球植被秋季落叶期物候响应干旱变化的研究。
中国科学院亚热带农业生态研究所苏以荣研究员团队在我国东部四个水稻分布气候区（中温带-黑土、暖温带-潮土、亚热带-红壤和热带-砖红壤）采用配对采样原则，随机采集了240对稻田和旱地表层土壤。分析发现，四个区域稻田土壤有机碳固持效率比相邻旱地土壤高39%~127%，且以温暖区（亚热带和热带）差异大于寒冷区（中温带和暖温带）。进一步随机选择40对土壤，基于生物标识物木质素和氨基糖分析，量化植物残体和微生...
Farmers' climate change conundrum: Low yields or revenue instability（图）
Farmers climate change conundrum Low yields revenue instability
2020/7/17
Climate change will leave some farmers with a difficult conundrum, according to a new study by researchers from Cornell University and Washington State University: risk more revenue volatility, o...
Impacts of climate change on water requirements of winter wheat over 59 years in the Huang-Huai-Hai Plain
Mann-Kendall test response of ETc crop water requirement
2016/2/22
Daily data from 40 meteorological stations in the Huang-Huai-Hai Plain from 1955 to 2013 were analyzed using the Mann-Kendall test and partial correlation to determine the temporal trends of meteorolo...
Climate change governs a crop pest,even when populations are far-flung（图）
Climate change crop pest populations are far-flung
2015/12/14
As delegates from 195 nations meet in Paris to debate mankind’s response to global climate change, scientists from the University of Kansas and Rothamsted Research in England today issue a s...
Analysis of vulnerability and resilience to climate change induced shocks in North Shewa, Ethiopia
Climate change Vulnerability Resilience Principal Component Analysis
2013/3/4
This article analyzes the vulnerability and resilience levels of farm households in North Shewa, Ethiopia, using a survey of 452 households. Agro ecological based classification was done to analyze vu...
Farmers' perception and knowledge on climate change and their coping strategies to the related hazards: case study from Adiha, central Tigray, Ethiopia
Adiha Farmers’ Perception Climate change Hazard Vulnerability Coping Adaptation
2013/3/4
Climate change adversely affects Ethiopian economy due to heavy dependence of the agricultural sector on rainfall. A decrease of rainfall and rise in temperature has been increasing the exposure of th...
Interactions between rural migration and land use change in the forest villages in the Gökçay Watershed
Land use mountainous forest villages rural migration
2011/6/29
This study was carried out to analyze the spatial and temporal pattern of land use/land cover change (from 1955 to 2008) and migration movement (from 1935 to 2007) in the Gökçay River Wate...
Macro to Micro Viewpoint of Climate Change - Linking Karnataka to Global Issue
Climate Change Adaptation and Mitigation Local Level Case Studies Agro-Climatic Zones India
2013/3/8
A numerous studies have been done on climate change at regional, national and global levels. Several climate models have predicted the global scenarios for climate in different parts of the world. How...
Climate change in the context of global environmental governance possibilities
climate change climate changes global warming governance global governance
2014/2/27
Recent information campaigns of media and the ongoing substantive discussions of experts have been more and more devoted to the climate change issue and its impacts that could affect our future and th...
Expansion of mechanised rain-fed agriculture and land-use/land-cover change in Southern Gadarif, Sudan
Mechanised agriculture change detection vegetation clearance
2011/1/11
This study was an effort to produce synthetic knowledge on the rapid land-use/land-cover (LULC) changes and on the integrating rates of change with fundamental patterns in southern Gadarif region, Sud...
Experiential Learning Teaches Change and Adaptation
economics environmental impacts social dynamics production levels experiential Learning Teaches
2009/12/16
Economics, environmental impacts, social dynamics, and production levels are all major factors that influence the overall success of an agroecosystem. Positive or negative, these factors enact change...
A CLIMATE PROFILE INDICATOR BASED COMPARATIVE ANALYSIS OF CLIMATE CHANGE SCENARIOS WITH REGARD TO MAIZE (ZEA MAYS L.) CULTURES
climate changes agriculture seasonality new method
2010/3/26
Using ecological data compiled from scientific literature on pest, pathogen and weed species
characteristic in maize cultures in Hungary, we defined monthly climate profile indicators and applied the...
Impacts of Climatic Change on World Agricultural Product Markets: Estimation of Macro Yield Functions
global warming world food model crop yields agricultural product markets
2009/9/9
Climatic change through global warming and drought is a major issue for agricultural production. Most researchers who discuss climate changes report the yield changes estimated by using crop process m...
Climate Change and Its Impacts on Grain Production in Jilin Province
Jilin Province climate change grain production
2009/8/28
The climate observation data, reanalysis data, and grain/soybean yields per unit area were used to analyze and interpret the impact of climate change on grain production. The results show that Jilin P...