屯留县旱农实验区农林牧优化结构研究

调整农林牧结构是干旱、半干旱地区农业走出低谷、摆脱困境的战略措施。本文通过对实验区资源评价、农业生产的历史考察和现状辨识。明确了农业发展的优势和主要问题,运用线性规划模型确立了多目标兼顾的农林牧优化结构。     

APPLICATION OF VEGETATION INDEX OF METEOROLOGICAL SATELLITE IN DROUGHT ANALYSIS OF NINGXIA

<正> There are five channels in NOAA-N series meteorological satellites. The channel No.1 is exactly located in the absorbtion band of vegetation, the channel No. 2 in the strong re-flection one. Therefore the two channels are suitable for monitoring and analysing vegeta-tion. To make certain mathematical value combination of two channels and specify its val-     

ANALYSES OF THE DIFFERENCE BETWEEN IRRIGATED AND NONIRRIGATED AREA FOR LUMINOUS ENERGY UTILIZATION RATIO AND PRODUCTIVE POTENTIALITIES IN NINGXIA

<正> Situated in arid and semi-arid lands, the Ningxia Hui Autonomous Region is locatedat the middle reaches of the Yellow River. An adequate system of gravity irrigation was es-tablished in the north of Ningxia. Adding to abundant sunshine, strong solar radiation andmoderate heat, the agriculture is very developed. The south mountainous area of Ningxia, including both Yanchi and Tongxin counties,is short of rain, The vast lands cannot be irrigated. Nonirrigated agriculture and serious     

林木抗旱性生理指标及其在干旱区造林中应用研究

<正> 中国干旱半干旱区面积占全国面积的52.5%,半壁河山是以水分胁迫为主导限制因子的特殊生态区。为了提高这一地区的造林质量,选择旱生和抗旱性强的树种造林是主要造林技术之一。对于如何评价和比较林木的抗旱性,传统方法多采用对林木生态环境因子及对林木生     

宁夏旱地农业类型分区及评价研究

旱地农业是指干旱、半干旱区的雨养农业。类型分区是因地制宜布局农业生产,找出农业技术措施推广的合理区间和开发旱耕地生产潜力之重要条件。该文在指出宁夏干旱特点的基础上,提出旱地农业类型分类的原则与指标和分区方法,最后将宁夏划分为荒漠草原风沙干旱牧业区、半农半牧区、半干旱典型草原旱作农业区和半湿润森林草原农林区。同时也给每一区的资源条件以综合评价。     

中国姬缘蝽科（半翅目）昆虫分类问题及区系研究

本文对中国分布的３６种半翅目姬缘蝽科昆虫的分类地位及名称上存在的问题作了清理，并对该科的中国区系问题进行了分析和讨论。     

模糊聚类分析在沂蒙山区土蝗群落分区中的应用

自１９８９－１９９３年对沂蒙山区的土蝗进行了全面调查。明确了沂蒙山区土蝗群落的优势种群由笨蝗Ｈａｐｌｏｔｒｏｐｉｓ ｂｒｕｎｍｅｒｉａｎａ Ｓａｕｓｓ、中华稻蝗Ｏｘｙａ ｃｈｉｎｅｎｓｉｓ （Ｔｈｕｍｂ）、大垫尖翅蝗Ｅｐａｃｒｏｍｉｕｓ ｃｏｅｒｕｌｉｐｅｓ ９Ｉｖａｎ）、短额负蝗Ａｔｒａｃｔｏｍｏｒｐｈａ ｓｉｎｅｎｓｉｓ Ｂｏｌ、长翅黑背蝗Ｅｕｐｒｅｐｏｃｎｅｍｉｓ ｓｈｉｒａｋｉ ＢＯｌ、花     

ON THE COMPREHENSIVE DEVELOPMENT AND UTILIZATION OF THE AGRICULTURAL RESOURCES IN YANCHI COUNTY——A TYPICAL TRANSITIONAL BELT BETWEN AGRICULTURE AND ANIMAL HUSBANDRY

<正> 1. The natural economic conditions of yanchi county Yanchi County (in Ningxia Province, China) lies between the Muwus Desert and theLoess Plateau, its geographical location is a typical transition belt. The view from south tonorth: the general configuration of the earth's surface is from the Loess Plateau to Ordos ta-bleland; the climate is from semi arid to arid. The transition of its geogrophical location pro-vides the area such features which are various,complex and fragile in natural conditions.     

不同时期使用农抗120控制花生网斑病侵染源的试验研究

用农抗120防治花生网斑病,不同使用方法效果不一。用常规喷洒叶面方法控制再侵染源,防效为21.4％,相当于多菌灵(29.4％);用农抗120和杀菌剂(抗枯灵或多菌灵等)混合,在花生播种时喷洒地面一次,控制初侵染源,防效为48.6％,用农抗120同杀菌剂混合,播种时喷洒地面,以控制初侵染源,7月上旬再喷洒叶面,控制再侵染源,效果最佳,防效高达70％以上。