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Search Results: 1 - 10 of 155838 matches for " 杨萍如 "
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广东的滨海沙土资源
刘腾辉,
自然资源学报 , 1988, DOI: 10.11849/zrzyxb.1988.04.007
Abstract: ?滨海沙土是广东沿海重要而急待改造利用的一种国土资源。分布广、面积大,风沙为害较甚。它集中分布在琼东北和西南部、陆丰至海丰、阳江至广州湾沿岸一带。主要因河流和地表径流携带的泥沙受潮浪、风力作用逐渐发育而成。按形成时间和特性,可分流动、半固定、固定和耕型沙土等亚类。并具有沙瘦的共同特性。改造利用主要措施是营林绿化。其次,是因地制宜地积极发展果蔬、热作等经济作物,改造沙荒草地,发展畜牧业,施肥改土,兴修水利和开发其旅游资源。
广东赤红壤的特征及其开发利用
, 刘腾辉
自然资源学报 , 1994, DOI: 10.11849/zrzyxb.1994.02.003
Abstract: ?本文介绍了广东省赤红壤的分布与面积、形成条件和形成过程的特点、土壤特性及开发利用。
红树林及其土壤
,何金海,刘腾辉
自然资源学报 , 1987,
Abstract: 红树林及红树林潮滩盐土广泛分布在世界低纬度海岸地区,是热带、亚热带的一种特殊自然资源,在生产和科研上都具有重要的意义。国内外许多学者从地植物学或土壤学科方面作过不少调查研究和报道。由于红树林及其土壤是热带、亚热带海岸特殊景观的主要组成部分,彼此间有着密切的相关性,尤其在红树植物生态、生理特征和土壤基本特性等方面。本文是在近几年广东省海涂土壤资源调查基础上进行一些探讨,为保护、发展我省红树林资源,及合理利用其土壤资源提供一些科学依据。
THE COASTAL SANDY SOIL RESOURCES IN GUANGDONG
广东的滨海沙土资源

Liu Tenghui,
刘腾辉
,

自然资源学报 , 1988,
Abstract: Coastal sandy soil is an important land resource that has to be improved urgently in Guangdong Province. It is widespread, large in area and has a direct effect on the raise of the living standard of the local inhabitants, the economic development and the improvement of ecological environments. Coastal sandy soil is mainly distributed in Hainan Island, the western and the eastern Guangdong. The formation of it is closely related with coastal landform, river hydrology and climate. A large number of mud and sand carried by rivers and surface runoff, under the different actions of tide, wave and wind, makes outer bar and sand beach form and develops gradually. According to its differences of soil-formation age and soil characteristics, coastal sandy soil can be divided into four subgroups: mobile, half-fixing, fixing and cultivated coastal sandy soils. Their common characteristics are (1) that they are sandy so that water and fertilizer can lose easily and (2) that nutrition is lacking and soil are poor. The improvement and utility of coastal sandy soil should be (1) building shelterbelts; (2) developing multiindustry; (3) improving and using uncultivated sand land; (4) spreading organic fertilizer in order to improve sandy soil; (5) building water conservancy projects and (6) developing tourist resources.
CHARACTERISTICS OF LATERITIC RED EARTH IN GUANGDONG PROVINCE AND ITS EXPLOITATION AND UTILIZATION
广东赤红壤的特征及其开发利用

Yang Pingru,
,刘腾辉

自然资源学报 , 1994,
Abstract: Lateritic red earth is a zonal soil in the south subtropical zone and distributes widely on low hilly land and platforms where the altitude is lower than 300-450 meters. Its area is large,occupying 45% of total soil area of Guangdong province. Under the bioclimatic conditions of the south subtropical zone where high temperature is accompanied by heavy rainfall,the characteristics of soil formation include strong desilication,ferric-allitic weathering, flourishing biological cycle, seashore re-salinization, etc. The following are the main characteristics of the soil: It has a complete genetic profile,the kaolinite content is the main part of clay minerals, the acidity is strong, the nutrient content is relatively low, and the soil texture is generally sandy.Lateritic red earth is a main base for developing a diversified agriculture on hills and platforms of the south subtropical zone in Guangdong province, Its productive potential is very great. In order to fully develop its productive superiority and raise the soil fertility, the following aspects must be emphasized. They are suitable exploitation and utilization of land according to local conditions, suitable, rotation and interplanting of crops, suitable dressing,preventing soil and water loss, developing irrigation, and so on.
红树林及其土壤
, 何金海, 刘腾辉
自然资源学报 , 1987, DOI: 10.11849/zrzyxb.1987.01.004
Abstract: ?红树林及红树林潮滩盐土广泛分布在世界低纬度海岸地区,是热带、亚热带的一种特殊自然资源,在生产和科研上都具有重要的意义。国内外许多学者从地植物学或土壤学科方面作过不少调查研究和报道。由于红树林及其土壤是热带、亚热带海岸特殊景观的主要组成部分,彼此间有着密切的相关性,尤其在红树植物生态、生理特征和土壤基本特性等方面。本文是在近几年广东省海涂土壤资源调查基础上进行一些探讨,为保护、发展我省红树林资源,及合理利用其土壤资源提供一些科学依据。
光合细菌处理有机污水的方法
,陈育,启银
南京师范大学学报(工程技术版) , 2002,
Abstract: 应用光合细菌对3种不同来源的有机污水进行了生物处理研究,对处理过程中的CODCr、BOD5、pH及光合菌量的变化进行了分析和测定.结果表明,经光合细菌处理一定时间后,3种有机污水宾馆生活污水、居民区生活污水及豆制品污水,其CODCr去除率分别为70.3%、69.1%、82.2%,BOD5的去除率分别为87.2%、91.1%、92.9%.出水pH分别为8.0、7.6、7.4.处理液中含光合细菌总数分别达到5.9×108、4.2×108和3.0×109个/mL.光合菌处理有机污水具有不带来二次污染和经济、简便的特点.
2506例煤工尘肺的减寿分析
,宋琦,李吴,杨志刚
宁夏医科大学学报 , 2006,
Abstract: 目的探讨煤工尘肺患者早死的主要原因及其对患者寿命的影响。〖HTXK〗方法通过回顾性流行病学方法,对煤工尘肺患者的主要死因进行潜在寿命损失年数(PYLL)、标化减寿年数(SPYLL)、标化减寿率(RateofSPYLL)、平均减寿年数(AYLL)等指标进行统计分析。结果导致Ⅰ、Ⅱ期煤工尘肺患者PYLL最高的主要死因是恶性肿瘤;Ⅲ期煤工尘肺患者PYLL最高的主要死因则是肺心病,其次是肺结核。各主要死因的AYLL、SPYLL、RateofSPYLL都是掘进工最高,其次是采煤工。结论〖HTSS〗今后对煤工尘肺患者中的重点关注对象是掘进工尘肺;三级预防的重点是防治肺心病和肺结核,以及各种恶性肿瘤的早期发现、诊断和治疗。
三种三唑类杀菌剂对映体生物活性的研究
,李树正,李煜昶,
农药学学报 , 2002,
Abstract: 采用高效液相色谱法(hplc)拆分了戊唑醇(tebuconazole)、粉唑醇(flutriafol)和己唑醇(hexaconazole)3种杀菌剂的外消旋体,并且制备了对映体的纯品。以花生褐斑病菌cercosporaarachidicola、番茄早疫病菌alternariasolani、油菜菌核病菌sclerotiniasclerotiorum、苹果轮斑病菌alternariamali、甜菜褐斑病菌cercosporabeticola等5种植物病原菌为供试菌,采用琼脂稀释法测定了3种杀菌剂的外消旋体及对映体的生物活性,比较了对映体之间抗菌活性的差异。结果表明:(-)-戊唑醇的抗菌活性优于(+)-戊唑醇;(+)-粉唑醇的抗菌活性优于(-)-粉唑醇;(-)-己唑醇的抗菌活性优于(+)-己唑醇。
光合细菌处理豆制品废水的研究
, 吴海清 , 启银 , 陈育
扬州大学学报(农业与生命科学版) , 2001,
Abstract: ????在厌氧及微好氧条件下,研究光合细菌对豆制品废水处理效果的影响。结果表明:在pH值为7.5、30℃、微好氧条件下,光合细菌对废水的CODcr去除率最高,且接种量与CODcr去除率成正比。
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