马尾松林下栽植胡枝子对土壤肥力的影响

对马尾松林下栽植胡枝子的培肥效果进行了试验研究。结果表明：２ａ生直播造林的胡枝子平均高度达７５．８ｃｍ,平均基径３．４ｍｍ,５ａ生生物量高达４３９５．５１ｋｇ／ｈｍ＾２,土壤分析表明,在０￣４０ｃｍ土层中,林下栽植胡枝子的土壤有机质,全氮,全磷,水解氮,速效磷,速效钾等比马尾松林分别增加３８．２８％、２６．７５％、２０．４１％,２５．３３％,１７．８４％和２２．６６％;土壤微生物数量比纯林高３０．     

引进前苏联陆地棉种质资源主要农艺及经济性状鉴定研究

针对国内棉花生产发展的需要,在石家庄地区自然条件下,我们对引进前苏联的１２９份和国内的７２份陆地棉种质资源的农艺性状、产量及产量因子和纤维品质等性状进行了系统的同步鉴定研究,结果表明：引进材料同国内材料相比,生育期相差不大,引进材料具有株高较矮、果枝节位较低,铃重较高,纤维较整齐,强度高,细度好的特点,而且,在果枝数、叶枝数、单株铃数、单铃重、衣分、子指、纤维整齐度、纤维伸长率等性状的变异潜力和变化幅度均大于国内种质资源。通过系统同步鉴定,筛选出早熟、矮秆、高衣分、高子指、长纤维、高强度和细度好等不同特性的优异材料４４份,改善了我国棉花种质资源缺乏的现状。     

Traditional conservation of vegetable cowpea in Nigeria

The vegetable cowpea, Vigna unguiculata (L.) Walp. ssp. unguiculata, is cultivated for its fresh pods and leaves in the derived savanna and forest belts of southeastern Nigeria. Nigerian material of this cowpea type with its diverse range of characteristics, is an important resource for improvement of cowpeas. The conservation and maintenance of this useful legume amidst the new varieties released yearly from research stations and seed companies have been accomplished through indigenous traditional methods. These methods have been discussed.     

红壤资源信息系统及其初步应用

Red soil is a very important soil resource in southern China. However, due to being simultaneously of high productive potentialities and severely degraded, it needs harnessing urgently. Red Soil Resource Information System (RSRIS) based on remote sensing and geographic information system (GIST plays an important role in survey, evaluation, utilization and management of red soil resource. RSRIS of Cauzhou City, Zhejiang Province (1:250000) and RSRIS of Longyou County, Zhejiang Province (1:50000) have been made respectively on SUN SPARC station and using ARC/INFO. This paper introduces the system design, database creation and system functions, and it particularly focuses on developing applied models, such as red soil resource division and mapping, suitability evaluation, erosion risk evaluation, plant utilization zone etc. The problems on study of RSRIS and its developing strategy are also discussed.     

窝铺山区森林植被水土保持效益及资源植物开发利用途径的研究

森林植被在涵养水源保持水土,减少土壤流失的作用很大,植物措施投资少,见效快、可长期发挥效益.对窝铺流域三年的治理及观测研究表明:森林植被保持水土效益明显;土壤侵蚀量小于其它植被类型;改善了生态环境;利于建立新的生态平衡,保证农业高产、优质稳定地发展.作者同时对研究区内的资源植物进行了调查分类,对资源植物的保护和开发利用提出了几个值得注意的问题.     

安徽柿树品种资源初步研究

安徽有２４个柿树品种,其中优良品种１３个,可划分为６种类型,主产淮河流域,各经长期栽培形成了自己的主栽品种。本文对柿树品种的产地、形态特征、经济性状、病虫害、营养成分及用途等方面作了详细描述,并提出适合大力发展的优质、高产、抗病虫害的优良品种。     

依靠科技进步增资减危理论体系研究*

根据我国森林资源危机的严峻现实，提出如何依靠科技进步缓解森林资源危机。研究提出了“组织促需”的理论体系，强调林业“科技－资源”系统结构效益和要素的协调，合理和有效的配置。并进行“组织促需”的林业科技实力，能力和潜力的分析评价。从森林资源总量和质量两个方面对森林资源基础进行了分析。针对森林生长长期性的特点，提出了用材林“资源度”的概念，并对森林资源增长中技术进步的作用进行了定量测算。最后提出十条对策     

益智种质资源表型性状的遗传多样性分析

对收集的90份益智种质资源的18个表型性状进行遗传多样性分析,以期为益智品种改良和种质创新提供依据.结果 表明:供试的益智种质具有丰富的遗传多样性,质量性状中多样性指数最高的为果形(1.1507),数量性状中多样性指数最高的为株高(2.0700),变异系数最大的为结果枝数(41.32％);提取的6个主成分累计贡献率为6...     

Microbial populations associated with the retting of melon pods ( Colocynthis citrullus L.) during seed recovery

The traditional process for the retting of melon pulp and microbiological characteristics in the recovery of melon seeds ( Colocynthis citrullus L.) were investigated. Melon pods were sliced open and exposed for seven days. The pulp underwent a natural fermentation that was characterised by the growth of microorganisms to 108–1010 cfu/g. The pH fluctuated between 4.8 and 5.1 with a lactic acid content of 0.72%. Bacillus subtilis, B. polymyxa, Lactobacillus fermentum, L. brevis and Streptococcus faecalis were the predominant microorganisms but, significant contributions were made by Staphylococcus saprophyticus and Enterobacter cloacae. Penicillium, Aspergillus and Rhizopus species including the yeasts, Sacharomyces cerevisiae Candida krusei and Deboromyces hansenii were isolated from the fermentation. Growth of microorganisms was completely inhibited in antibiotic-treated samples indicating that the melon pods were the main source of microorganisms for the fermentation.     

《农政全书》的水利建设思想

《农政全书》重视水利建设,力主发展西北水利,强调兴建水利工程必须搞好计划、设计,要合理负担、使用水利经费,要选拔水利管理人才,建立水利管理机构,加强监督检查,做好水利工程劳动力的征集工作。该书注重用水管理,提出要公正裁处水利纠纷,合理分配水利收益,惩处破坏水利设施的行为。