Effects of agriculture,climate, and policy on NDVI change in a semi-arid river basin of the Chinese Loess Plateau

In 1999, the Grain for Green Project was implemented by the Chinese government. Since then, the vegetation of Zuli River Basin, a semi-arid river basin of the Chinese Loess Plateau, has been greatly changed. Clearly understanding the impact of natural and artificial factors on vegetation change is important for policy making and ecosystem management. In this study, spatio-temporal variations in vegetation cover in Chinese Zuli River Basin during 1999–2016 were investigated using Landsat normalized difference vegetation index (NDVI) data. Analyses of several indicators, including changes in NDVI in different slopes and land use changes and the relationships between climatic factors and NDVI change, were presented to quantitatively evaluate the effects of agriculture, climate, and policy on NDVI change. The NDVI in the Zuli River Basin increased during the study period, and the main contributors to this change were forest in 1999–2011, cropland, abandoned farmland, and grassland in 2009–2016, and land with slopes ≤ 15°. Land with slope > 15°, where the “Project” was implemented, slightly contributed to the increase in regional NDVI. In 1999–2011, the project (?98.16%) combined with climate change (?68.18%) showed negative effects on the increase in NDVI in the Zuli River Basin, but agriculture (22.28%) played a positive role in increasing this index. In 2009–2016 and 1999–2016, the project (38.45% and 35.25%, respectively), the project combined with climate change (49.83% and 46.30%, respectively), agriculture (18.61% and 23.30%, respectively), promoted increases in NDVI in the basin.     

北京市蔬菜标准化基地存在的问题与对策研究

为推进农业标准体系落地,加快蔬菜的产业化进程,分析了北京市蔬菜产业及蔬菜标准化基地现状,汇总出推广基地标准化过程中存在的各种问题,并提出了提升农产品质量安全、推进蔬菜品牌建设等对策建议。     

山西旱作节水农业发展战略的思考

根据山西省"十年九旱"的气候特征,结合2008年冬、2009年春特大干旱对生产的严重影响,提出了山西制定旱作节水农业发展战略的必要性和特殊意义,分析了战略缺位的深层次原因,并从水资源安全、粮食安全、生态安全、产业协调发展及科技创新等几个方面提出了思考建议和对策。     

采用模糊形态学的大田害虫图像分割

介绍了基于机器视觉的大田害虫智能检测系统.文章通过对获取的大田害虫原始图像采用模糊形态学进行分割,将害虫从背景中分割出来,以提取出的周长、不变矩等特征,运用神经网络分类器对常见的9类害虫进行分类.试验验证了该系统的可行性,表明该方法分割速度快,容错性好,能够正确分割有噪声的大田害虫图像.     

河南省农业产业结构趋同研究

从河南省农业产业结构现状出发,阐述了河南省农业产业结构的同构特征,分析了其产业结构趋同成因,并提出了河南省农业产业结构调整建议。     

吉林省现代农业建设时间预测与发展策略研究

基于基层技术员调查,预测了吉林省基本实现现代农业的时间,73%的基层技术人员认为吉林省需要在20年之内才能完成。为了加快现代农业建设,基层技术人员认为需要以粮食产业为核心,以县或村为单位,分区推进,重点加大农业基础设施建设、农民职业培训等方面的投入。     

日本农协的典型经验及对我国农民合作经济组织的启示

应借鉴日本农协经验,在政府政策和法律支持的基础上,通过拓宽农民合作经济组织职能,建立健全内部规章制度,培养农业合作专业人才,发展我国农民合作经济组织。     

1951～2008年天津市气候季节变化特征及其对农业的影响

利用天津市1951～2008年的逐日气象资料分析了该市各气候季节的长度及初日变化及其对天津农业的影响。结果表明,50多年来,天津市各季节的长度及初日均发生了明显变化,主要表现为：冬季缩短,夏季延长;入冬推迟,入春、入夏提前。气候变暖导致天津市气候季节出现较大调整,对农作物播种时间、播种面积、产量及病虫害等均产生了重要影响。     

农业科研档案数字化建设实践与探析

中国热带农业科学院档案馆在探讨农业科研档案数字化管理与利用方面取得了一些进展.就农业科研档案数字化规划、操作流程、存在问题与建议展开探讨.     

Ancient Polyploidy and Modern Crop Plants

The growing set of fully-sequenced angiosperm genomes highlight the role of polyploidy in angiosperm evolution, and suggest that even the high level of importance we had already attributed to this mechanism was inadequate.