Regional Land Use Patterns and Water Consumption in the Jordan Valley Using Geographic Information Systems     

Nazeeh Almanasyeh  Zeyad Makhamreh  Brian Howard 《农业科学与技术》2012,(5):598-609

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西江油田现役海底管道内腐蚀现状评估     

何素娟  闫化云  赵大伟  张炜强  林世明 《油气储运》2012,31(1):23-26,82,83

借助SEM、EDS、XRD等技术手段对西江油田现役海底管道内腐蚀现状进行综合评估,结果表明:该海管横卧直管段的腐蚀产物比较疏松,未见开裂现象,过渡段、弯管段、直管段的腐蚀产物呈淤泥状,呈现出不同程度的裂纹痕迹;最深腐蚀坑集中在横卧直管段和直管段,过渡段、内弧和外弧腐蚀坑深度较浅,但腐蚀坑横向扩展较大。分析了该海管的内腐蚀机理和耐腐蚀性能,着重讨论了流体流场状态、原油蜡含量、凝析水等因素对海管腐蚀的影响,结果表明:服役期内该海管主要表现为CO2腐蚀,均匀减薄率和局部腐蚀速率在轻度和中度腐蚀范围内,表现了良好的耐腐蚀能力。  相似文献   

西藏昌都嘎玛沟文化景观的构成、特征及形成机制     

袁银枝  徐红罡  杨彦锋 《干旱区资源与环境》2012,(1):149-154

西藏昌都嘎玛沟文化景观内涵丰富、特点鲜明。嘎玛沟文化景观由众多自然和人文因子构成,其中,沟谷风貌、宗教文化、村落民居、民族工艺是最具代表性的载体。嘎玛沟文化景观在空间上带状聚集,在时间上世代传承,演绎了多元文化的互动交融。文中立意于结合实证材料、调研成果,对嘎玛沟文化景观的构成、特征及形成机制,进行分析研究。  相似文献   

玛纳斯河流域不同生态区地下水资源利用与开发模式研究     

封玲  汪希成  赖先齐 《古今农业》2012,(1):9-14

干旱区内陆河流域的地下水具有重要的生态地质作用。本文对玛纳斯河流域地下水开发方式及存在的问题进行了分析,针对不同地貌部位可供开采的地下水资源的特点及差异,提出不同生态区地下水资源的开发利用方式和注意事项。考虑到干旱区脆弱的生态环境,今后应严格管理和控制地下水开采量,保持合理的生态水位和合理比例的生态用水量,注意防止地下水过度开发引发新的生态环境危机,实现农业生产的可持续发展。  相似文献   

Murray Valley encephalomyelitis in a horse     

Holmes JM  Gilkerson JR  El Hage CM  Slocombe RF  Muurlink MA 《Australian veterinary journal》2012,90(7):252-254

A 5-year-old Thoroughbred mare presented with signs of severe pain and was taken to exploratory laparotomy based on suspicion of an acute abdominal lesion. A mild gastrointestinal lesion was discovered, but was considered disproportional to the severity of signs displayed. The mare was later euthanased because of intractable pain. Comprehensive postmortem examination, including polymerase chain reaction testing of central nervous system tissue samples, allowed a definitive diagnosis of Murray Valley encephalomyelitis to be made. This case demonstrates the variability of clinical presentations in horses infected with Murray Valley encephalitis virus.  相似文献   

Effects of Land Uses on Soil Organic Carbon and Carbon Pool Management Index     

Tang Guoyong  Li Kun  Sun Yongyu  Zhang Chunhua 《中国林业科技(英文版)》2012,(3):32-32

Carbon management index（ICM） is used to evaluate the scientificity of soil management.Soil organic carbon（SOC） and readily oxidized carbon （ROC） contents under Leucaena leucocephala stand, Acacia glauca stand,Acacia auriculiformis stand, Azadirachta indica stand,wasteland and dry cropland were determined and their ICM were calculated.The results showed that the SOC and ROC contents under the 6 land use types were 4.22-5.92 g·kg^-1 and 1.34-2.33 g·kg^-1,respectively.No significant differences in SOC contents among these land uses were observed.The ROC contents under the 4 types of woodland,however,were significantly higher than these under dry cropland or wasteland（P<0.05）. The ROC were high significantly（P<0.001） correlated（R² is 66.3%） with SOC.Compared with wasteland,the ICM ranged from 1.77 to 2.36 under these woodlands,and 0.99 under dry cropland.It is revealed that the litter quantity and land management under these land uses may be the key factors resulting in the variation of ROC.At ecological fragile region of Dry-hot Valley,closure management is useful to sequestrate C in woodland soils.However,the management systems for soil carbon pool under dry cropland are not in a sound way.  相似文献   

淮河流域汉唐时期农业灾害发展的基本特征     

张文华 《安徽农业科学》2008,36(6):2597-2598

通过对淮河流域汉唐时期农业灾害史料的搜集、整理与分析,发现此期该流域农业灾害的发展一直呈上升态势,愈往后,灾害发生的频次愈高;同时在不同阶段又表现出周期性波动,灾害构成差异,灾害集中性、连续性发生等特点。  相似文献   

微生态制剂 对樱桃谷肉鸭免疫机能的影响     

肖发沂  牛钟相 《水禽世界》2009,(7):7-11

将微生态制剂添加到基础日粮中饲喂初生樱桃谷肉鸭,于14日龄、21日龄、35日龄、42日龄时采血检测红细胞C3b受体花环(E-C3bR)率、红细胞免疫复合物花环(E-ICR)率和外周血T淋巴细胞,然后屠宰取脾脏、胸腺、法氏囊测定免疫器官指数.试验结果证明,14、21、35、42日龄试验组红细胞C3b受体花环(E-C3bR)率分别为17.09±0.36、16.12±0.39、15.27±0.46、15.35±0.30(分别比对照组高出6.28%、7.83%、8.99%和6.15%),红细胞免疫复合物花环(E-ICR)率分别为11.15±0.34、10.08±0.37、9.96±0.39和9.33±0.23(分别比对照组高出8.36%、12.25%、10.91%和10.28%).采用酸性α-醋酸萘酯酶(ANAE+)染色法.对四个相同日龄段鸭的外周血T淋巴细胞检测数量分别为57.18±0.71、66.52±0.51、69.66±0.57和71.92±0.51(分别高出对照组5.56%、8.27%、3.09%和5.04%).21日龄时试验组的胸腺指数、脾脏指数、法氏囊指数分别为6.15±0.15、1.14±0.06和1.73±0.07(分别高出对照组14.10%、13.07%和14.00%),42日龄时试验组分别为3.82±0.06、0.96±0.05和0.88±0.09(分别高出对照组25.26%、15.66%和35.38%).本研究结果显示,微生态制剂可以促进肉鸭免疫器官的生长发育,提高樱桃谷肉鸭的免疫器官指数,进而提高鸭群的特异性和非特异性免疫能力.  相似文献   

浅谈嫩江流域水源涵养林建设工程及措施     

朱晓军  白丽岩 《内蒙古林业调查设计》2009,(Z1):23-25

针对嫩江流域的基本情况,本着改善环境、可持续发展的原则,对本流域的水源涵养林建设工程提出有建设性的建议和措施。  相似文献   

Species of<Emphasis Type="Italic">Oligonychus</Emphasis> infesting date palm cultivars in the Southern Arava Valley of Israel     

E.?PalevskyEmail author  O.?Ucko  S.?Peles  S.?Yablonski  U.?Gerson 《Phytoparasitica》2003,31(2):144-153

In a study of date fruit damage caused byOligonychus spp., we investigated whether the cultivar affects phenology, and on what hosts the mites over-winter. Samples were taken from ‘Deglet Noor’, ‘Barhi’ and ‘Medjool’ trees from mid-April through mid-September during the years 1999–2002. In the ground-cover mites were monitored by collecting Bermuda grass (Cynodon dactylon) under each sampling tree. Over 99% of the mites collected on Deglet Noor and Barhi fruit were identified asO. afrasiaticus. Mean population levels ofO. afrasiaticus reached ten mites or more (initiation of infestation) on Medjool in the second half of May, whereas on Deglet Noor this did not occur before the first week of July. On Barhi the initiation of infestation varied between plots and years, ranging from the second half of May to the beginning of July, but always occurred earlier than Deglet Noor. Mite populations on the pinnae remained low from June through October, not exceeding seven mites per pinna, whereas on fruit strands they reached peak populations of approximately 4000 mites per strand. The sex ratio (proportion of females) ofO. afrasiaticus on fruit of all three cultivars was highly female-biased, usually above 0.85. During winter,O. afrasiaticus was found on Bermuda grass in the orchard ground-cover as well as on fronds of all three cultivars. http://www.phytoparasitica.org posting Jan. 30, 2003.  相似文献