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北方农牧交错带气候变化对农作物生产力影响的诊断分析-以定西县为例 被引量:19
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作者 李广 黄高宝 《干旱区资源与环境》 CSSCI CSCD 北大核心 2006年第1期104-107,共4页
根据北方农牧交错带(定西县1970-2000年)的气候资料,分析了该地区30年来气候变化周期、趋势及其农作物气候生产力的变化。研究结果表明:气温有上升而降水呈减少的态势,并且都具有7年的准周期,预计在下一个周期平均气温可能会增加到7.88... 根据北方农牧交错带(定西县1970-2000年)的气候资料,分析了该地区30年来气候变化周期、趋势及其农作物气候生产力的变化。研究结果表明:气温有上升而降水呈减少的态势,并且都具有7年的准周期,预计在下一个周期平均气温可能会增加到7.88℃,而降水将减少到377.7mm。在温度升高而降水不变的情景下,温度每升高1℃,农作物生产潜力增加69kg/hm2.a;相反情况下,降水每减少1mm,生产潜力减少9.7kg/hm2.a。研究农牧交错复合生态系统气候变化及农作物生产力对气候变化的响应且有非常重要的意义。 展开更多
关键词 北方农牧交错带 气候变化 农作物生产力 诊断分析
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基于无人机影像的农作物净初级生产力估算 被引量:1
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作者 谢忠元 刘刚 +1 位作者 何敬 王莹 《测绘与空间地理信息》 2021年第9期36-41,共6页
基于无人机影像对不同农作物植被在不同生长期的净初级生产力进行估算。本文对试验田区域的可见光植被指数(GRRI、GBRI、NGRDI、NGBDI、VDVI及RGBVI)与NDVI指数进行相关性分析,发现可见光波段差异指数(VDVI)与NDVI指数呈显著相关性。在... 基于无人机影像对不同农作物植被在不同生长期的净初级生产力进行估算。本文对试验田区域的可见光植被指数(GRRI、GBRI、NGRDI、NGBDI、VDVI及RGBVI)与NDVI指数进行相关性分析,发现可见光波段差异指数(VDVI)与NDVI指数呈显著相关性。在此基础上,将无人机影像的VDVI指数代入CASA模型,对试验田的农作物的月净初级生产力进行估算。结果表明:1)VDVI指数可以很好地区分水稻、玉米和黄豆等作物。2)碳密度月均值的大小与作物的生长时期有直接关系。处于枯萎期的玉米的碳密度均值小于实验田的碳密度月均值,处于生长期的水稻、黄豆和芋头等作物植被的碳密度值大于实验田的碳密度月均值。3)作物混种的碳密度均值大于单一作物的碳密度均值。 展开更多
关键词 农作物植被净初级生产力 可见光波段差异植被指数(VDVI) CASA模型 相关性分析
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气候变化对晋城市热量资源及农作物气候生产力的影响及应对措施 被引量:4
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作者 程海霞 宋方超 《现代农业科技》 2017年第22期191-191,194,共2页
选取1961—2008年晋城市3个代表站气温、降水资料,计算历年各地积温、无霜期和农业气候生产力,分析气候变化对气候生产力的影响,并提出了气候变暖背景下发展农业生产的对策。结果表明,近48年来,晋城市气温呈持续升高趋势,降水量呈波动... 选取1961—2008年晋城市3个代表站气温、降水资料,计算历年各地积温、无霜期和农业气候生产力,分析气候变化对气候生产力的影响,并提出了气候变暖背景下发展农业生产的对策。结果表明,近48年来,晋城市气温呈持续升高趋势,降水量呈波动减少趋势,≥10℃有效积温增多,大部分县市无霜期延长,农作物气候生产力减少。气候生产力的减少主要是由降水减少造成的,暖湿型气候对农业生产最为有利。 展开更多
关键词 气候变化 农作物气候生产力 热量资源 影响 应对措施 山西晋城
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A Sustainable Agriculture Production Model of Pampanga State Agricultural University in Central Luzon, Philippines
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作者 Norman De Jesus Honorio Soriano Jr +8 位作者 Rafael Rafael Emmanuel Pangilinan Cesar Orpiada Estrella Zabala Regina Loria Ernesto Supan Filomena Reyes Celso Reyes Angelina De Jesus 《Journal of Agricultural Science and Technology(A)》 2015年第8期671-677,共7页
Alternative Low-Input Agriculture Systems (ALIAS) center advocates organic and sustainable food production system through farm/field demonstration and piloting. The center undertakes activities, including research a... Alternative Low-Input Agriculture Systems (ALIAS) center advocates organic and sustainable food production system through farm/field demonstration and piloting. The center undertakes activities, including research and development, extension and training, technology dissemination, linkaging and promotional activities. The study established a campus-based demonstration technology showcasing ALIAS to facilitate easy technology diffusion. The objectives of this research were to promote: (1) bio-fertilizers and plant-based pesticides in managing insect pests and diseases of organic vegetables and fruit crops; (2) lotus-tilapia integration as a new modality of farming system in frequently flooded areas; (3) honeybee as pollinators to enhance productivity of organic vegetable and fruit crops; (4) Adlai as intercrop to organic vegetable and fruit crops in support to rice sufficiency; (5) native chicken-coffee integration. The results show that: (1) microbial inoculants and plant-based pesticides are effective in controlling diseases and insect pest, respectively; (2) lotus integration in tilapia production system have no negative effect on the tilapia yield; (3) honeybees as pollinators enhances fruit setting by 42%-68% in different crops; (4) Adlai is a viable intercrop for organic vegetable and fruit crops; (5) native chicken integration was found to be beneficial in terms of soil fertility, insect pest control, natural weeding practices and cultivation in the coffee plantation. 展开更多
关键词 Organic agriculture BIO-FERTILIZER plant-based pesticides honeybee integration techno-demonstration.
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Economic Value of Crop Productivity Biodiversity in ljebu Ode Agricultural Zone of Ogun State, Nigeria
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作者 Ayinde Alani Ezekiel Igbekele Amos Ajibefun +1 位作者 Taiwo Nuraeni Akinniran Folayimi Ogunwole-Olapade 《Sociology Study》 2016年第2期111-123,共13页
Biological diversity involves genetic, species, and ecosystem diversity. Genetic diversity denotes the variation within species in the functional units of heredity present in any plant or animal, microbial or other or... Biological diversity involves genetic, species, and ecosystem diversity. Genetic diversity denotes the variation within species in the functional units of heredity present in any plant or animal, microbial or other origin of living things. Species diversity encompasses the variety of species--whether wild or domesticated, within a geographical area. This study assesses the economic value of crop productivity biodiversity in Ijebu Ode agricultural zone of Ogun State. The authors proposed a dynamic model of market equilibrium with vertical product differentiation that enabled us to take into account the economic consequences of respondents' monthly income and species crop of three different communities. The objectives of the study are to identify the personal and socio-economic characteristics of farmers and determine the importance of biodiversity in the study area using Simpson's Index. The result showed that 52.50% were male, majority (32.50%) were within the age range of 31 and 40 years old, 44.17% were married, 62.50% had household size of 6-10, and majority (45.83%) had secondary education while 46.67% had up to 20 years farming experience. In conclusion, the authors find that effective factors play an important role in explaining the support for biodiversity conservation, particularly when people do not have specific knowledge about species; while ecological-scientific considerations appear when people are well-informed. 展开更多
关键词 Economic value CROP PRODUCTIVITY BIODIVERSITY CONSUMERS
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