MULTI-OBJECTIVE PROGRAMMING MODEL OF TROPICAL CROPS IN HAINAN ISLAND

I.Introducti0I1Hail1al1isthelargnsttropicalislal1dwitllabundal1t11aturalrcsourccssuitablef0rgrowtllgtrol,icalcropsand\\4t11ven'highp0tentia1pr0d,uctivity.Hotx'cY'cr,t11c1-ca1'cstillsomeproblemsf(l)Tl1ese1ectionoflandsuitableforfqrestisn0tstrictalldPreservativerateoftr0picalcr0psislow,(2)Mostoftropicalcr0psarecollccntratcdillthezoneofeastern"windgap"andnorthern"frigidplace"andtheirsecurityisnotstable,(3)Rubberareaaccountsforab0uttwo-thirdsoftl1etotalarea0ftropica1crops,henceproportiondis1ocat…     

云南气候特征与主要经济作物种植适宜性的关系

基于云南省、贵州省和广西壮族自治区共163个站点气候资料和主要经济作物产地分布数据,应用作物生态学和农业气象学原理,分析云南气候特征与经济作物种植的气候适宜性关系.结果表明,受季风气候、高原山地气候、低纬气候的影响,云南干湿季节分明、夏季气温偏低、春秋季长、气温日较差大、干季日照较多,具有气候区域性和层次性差异特点,由...     

通过训练样本采样处理改善小宗作物遥感识别精度

训练样本质量是决定农作物遥感识别精度的关键因素,虽然高空间分辨率卫星的发展有效地解决了农作物遥感识别过程中的混合像元问题,但是当区域内不同作物种植面积差异较大时,训练集中不同类别样本数量往往相差较大,这样的不均衡数据集影响分类器的训练,导致少数类别的识别精度不理想。为研究作物遥感识别过程中的不均衡样本问题,本文基于GF-2号卫星数据,首先挖掘了地物的光谱信息、纹理信息,用特征递归消除RFE (Recursive Feature Elimination)方法进行特征优选,然后从数据处理的角度采用了5种采样算法对不均衡训练集进行处理,最后使用采样后的均衡数据集训练分类器,对比数据采样前后决策树与Adaboost(Adaptive Boosting)两种分类器的识别结果,发现:(1)经过采样处理后两种分类算法明显提升了小宗作物的分类精度;(2)经过ADASYS (Adaptive synthetic sampling)采样处理后,分类器性能提升最多,决策树的Kappa系数提高了14.32%,Adaboost的Kappa系数提高了10.23%,达到最高值0.9336;(3)过采样的处理效果优于欠采样,过采样对分类器的性能提升更多。综上所述,选择合适的采样方法和分类方法是提高不均衡数据集遥感分类精度的有效途径。     

Mapping the agricultural land use of the North China Plain in 2002 and 2012

Journal of Geographical Sciences - Based on the MODIS NDVI data and Landsat TM/ETM data of 2002 and 2012, this paper extracts the planting area of winter wheat—summer maize, single spring...     

海南岛热带作物多目标规划模型

本文从海南热带作物生物特性、现实生产结构和地区气候条件出发、对热作种植业进行了模湖区域性划分；在计算构成各区产量基本参数的基础上，应用多目标规划方法，建立了热作结构优化的近期分区模型；并通过近期基础模型和对未来参数的预测，建立了远期灰色规划模型。结果表明，近期方案可提高收益5．1－55．7％，远期方案可提高54－90％，远近期方案均取得了明显的经济效果。     

中国生态农业地质研究及其前景

中国29个省、市、自治区的土壤质量和农作物优质高产与土壤环境中化学元素N、P、K、S、Fe、Mn、Cu、Zn、B、Mo、V、Sr、Ti、Mg、La、Ce、Pr、Nd、Sm、Eu、Y、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、Ca、Co、Ni、F、Tl、Si、Na、Cr、Ph、Cd、Hg、Se、Ba、Te、Ta及有机质、酸碱度、含盐量有密切的关系。土壤的质量为优质高产打下了基础,应充分地开发利用和保护。提出了生态农业地质研究的目的、内容、方法、管理及其前景。     

气候变暖对西北干旱区农作物种植结构的影响

采用年平均气温与冬小麦、春小麦、玉米和棉花种植面积的相关分析得出：年平均气温与新疆冬小麦种植面积呈显著负相关,与西北干旱区大部地方春小麦种植面积呈显著负相关,与西北干旱区大部地方玉米种植面积呈显著正相关,与新疆和甘肃河西棉花种植面积呈显著正相关。气候变暖、热量资源增加,使喜凉的春小麦和冬小麦种植面积呈迅速减少趋势,喜温的玉米和棉花种植面积呈迅速扩大,夏秋作物种植结构发生明显改变。     

梅州山区热带水果和经济作物的地域布局--梅州市"99寒害"水果经作受灾调查

由于北方冷空气入侵,１９９９年１２月２０日至２６日梅州市出现连续７天的低温霜（冰）冻天气,热带亚热带水果、经济林和经济作物（以下简称果作）受到严重危害,造成巨大的经济损失。为了解受灾情况,研究本省山区今后果作发展问题,在梅州市人民政府、市政协和市农委的支持和协助下,由广州地理研究所派专业技术人员到梅州进行调查研究。本文对果作寒害进行分析,并提出发展果作的措施。     

NIMBY or how do the rural neighbours respond to genetically modified (GM) crops? An exploration of the structure of reactions by inhabitants in rural communities in The Netherlands to the commercial cultivation of GM crops in their community

The debate on genetic modification (GM) is persistent, polarized and mainly involves organized groups at the national level. With the European Union’s new policy of coexistence, commercial cultivation of GM crops is expected by the Dutch Ministry of Agriculture, Nature and Food Quality within the next few years, especially maize (BT) and potato (Phytophthera resistance and starch production). This makes the debate relevant for those directly confronted with this cultivation: the inhabitants of local rural communities. In The Netherlands, stakeholders formulated coexistence rules to prevent problems between conventional, organic and GM farmers that grow their crops in the same limited land area. Little is known, however, regarding the perceptions of the non-farming inhabitants of rural communities (“the neighbours”) in the debate. This paper presents the results of a focus group-based argumentative analysis of whether (and how) the GM issues play a decisive role among non-farming inhabitants of four rural communities in the Netherlands. We analysed the arguments in relation to a conceptual model that describes the potential rise and dynamics from a pre-Nimby ambivalence towards an outspoken Nimby position. We observed that the GM debate was given very little priority relative to other national issues on the political agenda and that more social cohesion correlates with fewer arguments in the national debate. It is argued that this mechanism keeps the Nimby ambivalence in an undetermined mode, which in turn diminishes the chances of radical rural-based protest against local GM cultivation of crops.     

Environmental drivers of phytoplankton crops and taxonomic composition in northeastern Antarctic Peninsula adjacent sea area

The ecosystem of the sea region adjacent to the Antarctic Peninsula is undergoing remarkable physical and biological changes, in the context of global warming. However, understanding of the dynamics of phytoplankton taxonomic composition in this marginal ice zone remains unclear. In this study, seawater samples collected from 36 stations in the northeastern Antarctic Peninsula were analyzed for nutrients and phytoplankton pigments.Combining with CHEMTAX analysis, remote sensing data, and physico...