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典型相关分析方法在半干旱区作物生长系统中的应用 被引量:2
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作者 李自珍 《兰州大学学报(自然科学版)》 CAS CSCD 北大核心 1995年第2期109-115,共7页
典型相关分析是研究两变量集间相关关系的主要方法,本文根据大田试验结果,对半干旱区主要作物春小麦的两个生长阶段中的环境因子集与作物指标集进行了典型相关分析,在极大相关下计算得各对典型变量及其得分等,结果表明,环境因子中... 典型相关分析是研究两变量集间相关关系的主要方法,本文根据大田试验结果,对半干旱区主要作物春小麦的两个生长阶段中的环境因子集与作物指标集进行了典型相关分析,在极大相关下计算得各对典型变量及其得分等,结果表明,环境因子中土壤含水率作用最大,是作物生长的限制因子;土壤速效氮贡献率最高.作物指标中叶面积指数对环境条件的反应最显著. 展开更多
关键词 小麦 环境因素 典型相关分析 作物生长系统
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作物生长系统CTM模型参数的确定 被引量:1
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作者 朱永华 《甘肃科学学报》 1998年第3期85-90,共6页
以甘肃省武威川区春小麦生长为例,参照Olson等人的方法对作物生长系统CTM模型参数确定进行了研究,特别在光能资源跃迁速率λ12、土壤养分跃迁速率λ45和呼吸消耗系数α6等参数的确定上,使其更符合作物生理机理。
关键词 作物生长系统 CTM模型 参数确定 春小麦
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基于SALUS与WebGIS整合的作物生长仿真系统的设计
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作者 王建平 任卫德 苏林猛 《中国农机化学报》 北大核心 2013年第6期115-119,共5页
SALUS是较为著名的作物生长仿真模型。本文实现了一种基于WebGIS整合SALUS的作物生长仿真系统,详细阐述了数据库和相关功能模块的整合方法,改善了SALUS模型在空间数据处理与仿真结果视觉化的能力,为构建基于WebGIS的作物生长仿真系统提... SALUS是较为著名的作物生长仿真模型。本文实现了一种基于WebGIS整合SALUS的作物生长仿真系统,详细阐述了数据库和相关功能模块的整合方法,改善了SALUS模型在空间数据处理与仿真结果视觉化的能力,为构建基于WebGIS的作物生长仿真系统提供了一定的技术支撑。 展开更多
关键词 作物生长仿真系统 SALUS WEBGIS 系统整合
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基于SALUS与WebGIS整合的作物生长模拟
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作者 王建平 孙文新 苏林猛 《中国农业科技导报》 CAS CSCD 北大核心 2013年第5期120-128,共9页
SALUS是较为著名的土地可持续使用系统模型,实现了一种基于WebGIS整合SALUS的作物生长仿真系统。详细阐述了数据库和相关功能模块的整合方法,改善了SALUS模型在空间数据处理与仿真结果视觉化的能力。可以让使用者清晰的掌握土壤、天气... SALUS是较为著名的土地可持续使用系统模型,实现了一种基于WebGIS整合SALUS的作物生长仿真系统。详细阐述了数据库和相关功能模块的整合方法,改善了SALUS模型在空间数据处理与仿真结果视觉化的能力。可以让使用者清晰的掌握土壤、天气、灌溉量、施肥量等多种因素对农作物产量的影响,为农作物实施相关的增收管理措施提供了一定的科学依据。并提出了相应的整合方案为实际构建基于WebGIS的作物生长仿真系统提供了一定的技术支撑。 展开更多
关键词 作物生长仿真系统 SALUS WEBGIS 系统整合
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课题名称:基于生理生态过程的南方果树可视化建模与生长系统开发
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《中国农业科技导报》 CAS CSCD 2009年第5期95-95,共1页
课题目标、内容:以柑橘和龙眼为重要经济作物类型,开展基于生理生态过程的作物可视化建模与生长系统研究与开发,旨在初步建立从顶层框架设计、关键技术解决、本体知识库建设、生长数学模型开发到系统原型集成与示范应用的可视化作物... 课题目标、内容:以柑橘和龙眼为重要经济作物类型,开展基于生理生态过程的作物可视化建模与生长系统研究与开发,旨在初步建立从顶层框架设计、关键技术解决、本体知识库建设、生长数学模型开发到系统原型集成与示范应用的可视化作物生长系统的理论、技术与运行体系,并形成自主产权的软件产品。 展开更多
关键词 作物生长系统 生理生态过程 可视化建模 研究与开发 南方果树 名称 经济作物 示范应用
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冬小麦叶片生长特征的动态模拟 被引量:42
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作者 陈国庆 朱艳 曹卫星 《作物学报》 CAS CSCD 北大核心 2005年第11期1524-1527,共4页
关键词 生长特征 动态模拟 小麦叶片 虚拟现实技术 农业信息技术 作物生长系统 作物群体 发育动态 叶片形态
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浅谈计算机在农业方面的应用
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作者 郑丽萍 王丰林 《山西统计》 2003年第12期98-98,共1页
关键词 中国 农业信息化 计算机应用 数据分析 科研管理 辅助决策系统 农业数据库 作物生长模拟系统
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Evaluation and Performance of the APSIM Crop Growth Model for German Winter Wheat, Maize and Fieldpea Varieties in Monocropping and Intercropping Systems 被引量:1
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作者 H. Knorzer R. Lawes +2 位作者 M. Robertson S. Graeff-Honninger W. Claupein 《Journal of Agricultural Science and Technology(B)》 2011年第5期698-717,共20页
Competition for solar radiation between plants grown in multi-species cropping systems can severely limit crop production of individual species within that system. There are various approaches for modeling light inter... Competition for solar radiation between plants grown in multi-species cropping systems can severely limit crop production of individual species within that system. There are various approaches for modeling light interception within mixed-cropping and row or strip intercropping systems. To extend the knowledge about model behavior and different model approaches under interspecific competition conditions, the Agricultural Production Systems Simulator (APSIM) was evaluated and calibrated for field experiments previously described and simulated by the Decision Support System for Agrotechnology Transfer (DSSAT). Initially the APSIM plant model was successfully modified to simulate wheat, maize and fieldpea monocultures in the European agro-ecological zone. Once calibrated, the APSIM model was then used to simulate a strip relay intercropping maize/wheat and maize/fieldpea system. In DSSAT, a shading algorithm was introduced to modify the daily weather input in order to take competition for solar radiation into account. In contrast, APSIM simulates interspecific competition using a modified Beer's law for multi-component canopy conditions. After a re-evaluation of the model regarding a minimum change of crop coefficients and variables, APSIM was able to simulate dry matter and grain yield of German maize, wheat and fieldpea varieties adequately. However, APSIM is a point-based model, and many of the processes that influence strip cropping cannot be accommodated by adjusting Beer's Law alone. So far none of the tested frameworks successfully modeled strip or relay intercropping. The processes governing growth in the numerous and very diversifying intercropping systems are complex and at this point in time have not been captured in sufficient detail. 展开更多
关键词 APSIM competition DSSAT INTERCROPPING modeling solar radiation
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Assessment of Heavy Metals Control from Soil and Vegetable Plants in Different Growing Systems
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作者 Neculai Munteanu Vasile Stoleru Carmen Hura 《Journal of Agricultural Science and Technology(A)》 2012年第5期716-722,共7页
Heavy metals contents of soils and vegetable edible parts were studied at three crop systems (conventional, in conversion and organic) from seven traditional sites for vegetable growing in North-eastern Romania, dur... Heavy metals contents of soils and vegetable edible parts were studied at three crop systems (conventional, in conversion and organic) from seven traditional sites for vegetable growing in North-eastern Romania, during 2010. The main goal of the research was to find a correlation between the heavy metals contents and the crop systems. Determination of heavy metals was performed by atomic absorption spectrometry (AAS), using a Shimadzu spectrophotometer, 6300 version, equipped with graphite furnace and autosampler. Heavy metals contents in the soils varied with the metals and locations, according to the crop system. The following experimental average contents were determined: Mn-262.03 mg kg1, Zn-45.60 mg kgq, Cu-28.53 mg kgl, Pb-5.20 mg kg1 and Cd-1.84 mg kg1. In vegetable edible parts, heavy metal varied with metals, sites and plant species, without a significant correlation with crop system. The trend of heavy metals in conventional and organic crops was Zn 〉 Cu 〉 Mn = Pb 〉 Cd, but in conversion crops it was Zn 〉 Mn = Pb 〉 Cu 〉 Cd. The highest content was of Zn (4.85 mg kg't), at a cabbage crop in conversion. Cd was not detected in vegetable products and Pb was detected only in some vegetable samples. Research emphasized that heavy metals contents from soil and vegetable edible parts did not exceed the admitted maximum limits, according to Romanian and European Regulations. Final conclusion of research is that no correlations exist between crop systems and heavy metals contents from soil and plant. 展开更多
关键词 Vegetable growing conventional agriculture organic agriculture POLLUTION crop systems.
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Improvement of light uniformity by lighting arrangement for standardized crop production
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作者 Lee Hwa-Soo Kwon Sook-Youn Lim Jae-Hyun 《Journal of Central South University》 SCIE EI CAS 2014年第11期4311-4319,共9页
In a commercialized, fully artificial plant factory, artificial luminaire is arranged in a unified way using a general illumination theory, an actual measurement, or an empirical methodology. However, with these metho... In a commercialized, fully artificial plant factory, artificial luminaire is arranged in a unified way using a general illumination theory, an actual measurement, or an empirical methodology. However, with these methods, lightings are implemented without considering specific optical characteristics of lighting or material characteristics of each component that constructs a cultivation system, resulting in an amount of light that becomes irregular. The amount of lighting is closely related with the growth and quality of crops, and the deviation between points where cultivated crops are located causes quality difference in the produced crops, thus impairing the economic feasibility of a plant factory. In this regard, a simulation to figure out an optimum lighting layout was performed. Arrangements based on the spectrum distribution of light source and reflector materials were implemented to ascertain the distance between lighting and height of lighting and gather information in the pre-treatment process to improve the uniformity of light in the plant cultivation system. Improvement of around 15% in light uniformity is achieved compared with the existing system after the simulation is carried out. This result would reduce the deviation in crop growth to make uniform quality crop production possible. 展开更多
关键词 high-quality crop light uniformity improvement optimal lighting layout fully artificial plant factory Relux simulation
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Long-term variability of root production in bioenergy crops from ingrowth core measurements 被引量:1
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作者 Cheyenne Lei Michael Abraha +1 位作者 Jiquan Chen Yahn-Jauh Su 《Journal of Plant Ecology》 SCIE CSCD 2021年第5期757-770,共14页
Aims Long-term determination of root biomass production upon land-use conversion to biofuel crops is rare.To assess land-use legacy influences on belowground biomass accumulation,we converted 22-year-old Conservation ... Aims Long-term determination of root biomass production upon land-use conversion to biofuel crops is rare.To assess land-use legacy influences on belowground biomass accumulation,we converted 22-year-old Conservation Reserve Program(CRP)grasslands and 50+-year-old agricultural(AGR)lands to corn(C),switchgrass(Sw)and restored prairie(Pr)biofuel crops.We maintained one CRP grassland as a reference(Ref).We hypothesized that land-use history and crop type have significant effects on root density,with perennial crops on CRP grasslands having a higher root biomass productivity,while corn grown on former agricultural lands produce the lowest root biomass.Methods The ingrowth core method was used to determine in situ ingrowth root biomass,alongside measurements of aboveground net primary productivity(ANPP).Ancillary measurements,including air temperature,growing season length and precipitation were used to examine their influences on root biomass production.Important Findings Root biomass productivity was the highest in unconverted CRP grassland(1716 g m?2 yr?1)and lowest in corn fields(526 g m?2 yr?1).All perennial sites converted from CRP and AGR lands had lower root biomass and ANPP in the first year of planting but peaked in 2011 for switchgrass and a year later for restored prairies.Ecosystem stability was higher in restored prairies(AGR-Pr:4.3±0.11;CRP-Pr:4.1±0.10),with all monocultures exhibiting a lower stability.Root biomass production was positively related to ANPP(R2=0.40).Overall,attention should be given to root biomass accumulation in large-scale biofuel production as it is a major source of carbon sequestration. 展开更多
关键词 biofuel ecosystems corn ingrowth core method root biomass restored prairie SWITCHGRASS
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