武汉城市圈城乡建设用地增减挂钩潜力空间自相关分析   总被引：1，自引：0，他引：1  

李勉  王秀兰  程龙 《水土保持研究》2014,21(2):223-227

城市化发展进程不断加速的新时期,城乡建设用地增减挂钩政策的提出和实施对统筹城乡发展,满足城市用地需求和保护耕地具有现实意义。以空间自相关分析方法为主要研究方法,引入Moran’s I指数以及Moran’s I散点图对武汉城市圈各市增减挂钩潜力进行空间自相关分析;以2000—2008年的人口及土地利用结构数据,和2008年为基期的土地利用现状数据,预测武汉城市圈各市农村人口及城镇人口数量,测算目标年2015年和2020的建设用地增减挂钩潜力系数。研究结果表明武汉城市圈各市增减挂钩潜力在空间位置上存在一定的聚集效应。可为武汉城市圈大部分城市增减挂钩潜力较大,区域之间存在相关性,有利于指标的转换和联动。  相似文献   

孟加拉国Bhanugach西部保育林用地类型变化(英文)   总被引：1，自引：0，他引：1  

Md. Abdul Halim  Abdus Shahid  Mohammad Shaheed Hossain Chowdhury  Mst. Nazmun Nahar  Md. Shawkat Islam Sohel  Md. Jahangir Nuruddin  Masao Koike 《林业研究》2008,19(3):193-198

应用遥感和地理信息系统调查了孟加拉国Sylhet林业分局所辖的Bhanugach西部保育林从1988年到2006年间用地类型的变化。应用了监督和非监督两种方法,用全球定位系统搜集了地面控制点。地理信息系统软件制成地图。结果表明,植被覆盖从1988年的1826hm2大幅地降低到1996年的1714.85hm2,随着协同管理措施的实施,植被覆盖自1996年后逐年增长到2006年的1847.83hm2。在没有其他类型的用地转变成裸地的情况下,裸地变化与植被覆盖间成反比。18年间水体面积从1988年的307.67hm2增加到1996年379.53hm2,96-97年间略有下降,1997年以后直到2006年基本保持不变。本文还提出了将遥感技术和地理信息系统应用于用地类型变化及地理信息系统数据库创建的一些建议。  相似文献   

Morphological and Genetical Variability among Rhizoctonia solani Isolates Causing Sheath Blight Disease of Rice     

Rahman Moni Zakiah  Ansar Ali Md  Shahidul Alam Md  Asif Rahman Md  Rejwan Bhuiyan Md  Salim Mian Md  Md Iftekharuddaula Khandakar  Abdul Latif Md  Ashik Iqbal Khan Mohammad 《水稻科学》2016,23(1):42

Eighteen isolates of Rhizoctonia solani collected from infected rice plants in four different locations of Bangladesh were studied by using morphological characters and molecular markers. Anastomosis study with a reference isolate confirmed that all the isolates belonged to R. solani. Significant variation was observed in sclerotial size, shape and distribution. Un-weighted pair group method with arithmetic mean dendrogram constructed based on the Gower's general similarity coefficient showed that these isolates were grouped into four clusters at the 0.68 similarity coefficent according to morphological characters. Cluster I was a major cluster consisting of 13 isolates, while clusters Ⅱ to Ⅳ consisted of 1 or 2 isolates. Analyses by variable number of tandem repeat and amplified fragment length polymorphism markers showed that the isolates were grouped into five and three clusters at a similarity coefficient of 0.64 and 0.69, respectively. Although most of the variability was found between isolates from different regions as expected, significant variation was observed within the isolates collected from similar agro-ecological regions. Our results suggest the presence of different races of R. solani within the same local geographic regions.  相似文献   

碱胁迫对结缕草、高羊茅种子萌发及其胚生长的影响   总被引：2，自引：0，他引：2  

陈忠林  张学勇  张绵  陈峰  赵众 《种子》2010,29(12)

用NaHCO3和Na2CO3两种碱性盐以9∶1的摩尔比配制浓度分别为30、60、90、120 mmol/L的混合盐溶液作为碱胁迫处理液,对结缕草和高羊茅种子进行碱胁迫发芽试验。结果表明,在碱胁迫下,结缕草和高羊茅种子的发芽率、发芽势、发芽指数以及胚芽长和胚根长均随着碱胁迫浓度的升高而呈降低趋势,碱浓度达到90 mmol/L和120 mmol/L时,相应的结缕草和高羊茅种子均未萌发;结缕草和高羊茅种子萌发耐碱性的临界值分别为30 mmol/L和60 mmol/L;高羊茅种子萌发的耐碱性强于结缕草。  相似文献   

Effect of exogenously added ferulic acid on in vitroFusarium oxysporum f. sp. niveum     

Hong-sheng Wu  Jia Luo  Waseem Raza  Yan-xia Liu  Mian Gu  Gao Chen  Xiao-feng Hu  Jing-heng Wang  Ze-sheng Mao  Qi-rong Shen 《Scientia Horticulturae》2010

Allelochemicals from root exudates or decaying residues of watermelon plant may be related to watermelon fusarium wilt. The aim of this work was to study the effect of an artificially applied allelochemical, ferulic acid, on in vitroFusarium oxysporum f. sp. niveum (FON), a causal pathogen of plant wilting in the laboratory setting.  相似文献   

棕熊蛔虫ITS rDNA的PCR扩增与序列分析     

彭仕明  黄勉  陈武  唐剑栋  蔡勤辉  梁玉珍  林瑞庆  朱兴全 《中国兽医寄生虫病》2008,16(3):1-5

目的以核糖体DNA（rDNA）的第一与第二内转录间隔区序列（ITS-1及ITS-2）鉴定从广州动物园棕熊分离的蛔虫种类。方法应用PCR方法以保守引物NC5和NC2扩增蛔虫样本的ITS及5．8SrDNA序列,将PCR扩增出的片段纯化后克隆至pGEM-TEsay载体,用菌落PCR及酶切鉴定阳性菌落,对阳性菌落进行测序,并与Gen．Bank“公布的人蛔虫（Ascaris lumbricoides）、猪蛔虫（Ascariis suum）、浣熊贝利斯蛔虫（Baylisascaris procyonh）及狮弓蛔虫（Toxascaris leonina）ITS序列比较。结果从棕熊分离的2个蛔虫样本的ITS及5．8SrDNA总长为859—861bp,种内相似性为99．7％,与GenBank^TM公布的人蛔虫、猪蛔虫、浣熊贝利斯蛔虫及狮弓蛔虫的相似性分别为84．6％、84．5％、89．3％及72．3％,序列差异明显。结论棕熊蛔虫不同于上述种类蛔虫,可能为Baylisacaris transfuga.  相似文献   

Evaluation of immunostimulatory and immunotherapeutic effects of tropical mushroom (<Emphasis Type="Italic">Lentinus edodes</Emphasis>) against eimeriasis in chicken     

Muhammad Irfan Ullah  Masood Akhtar  Mian Muhammad Awais  Muhammad Irfan Anwar  Kashfa Khaliq 《Tropical animal health and production》2018,50(1):97-104

Mushrooms (Lentinus edodes) were processed for hot water (HWE), methanolic (ME), and polysaccharide (PSE) extracts. Polysaccharides were isolated through ion exchange (DEAE cellulose) and size exclusion (Sephadex G-100) chromatography. Monosaccharides including maltose (0.282%), glucose (0.113%), and mannose (0.451%) were identified, qualitatively and quantitatively, from the isolated polysaccharides through high-performance liquid chromatography. The whole study was divided into two experiments. Experiment 1 was meant for the evaluation of HWE and ME; whereas, experiment 2 was meant for the evaluation of PSE for immunostimulatory and immunotherapeutic activities. The cellular and humoral immune responses were demonstrated through lymphoproliferative response to phytohemagglutinin-P (PHA-P) and anti-body response to sheep red blood cells (SRBCs), respectively. The immunotherapeutic effects of these extracts were demonstrated against eimeriasis in terms of lesion scoring, oocysts per gram of droppings, and percent protection. Cell-mediated immune responses observed at 24, 48, and 72 h post-PHA-P injection were significantly higher (P < 0.05) in chickens administered with any of the three extracts (PSE, ME, and HWE), when compared with the controls. Humoral immune response in terms of anti-SRBCs anti-body titers was also observed higher in chickens administered with mushroom extracts. In the challenge experiment, significantly higher (P < 0.05) OPG and lesion scores were observed in controls as compared to the groups administered with mushroom extracts (HWE, ME, and PSE). Significantly higher (P < 0.05) percent protection against eimeriasis was observed in all groups administered with different extracts of L. edodes as compared to controls. In conclusion, L. edodes extracts showed immunostimulatory potential which persisted against eimeriasis in chicken.  相似文献   

一类索赔相依二元风险模型的破产概率问题研究     

张冕  高珊 《湖南农业大学学报(自然科学版)》2008,(2)

考虑一种相依索赔风险模型,模型中假设每次主索赔可随机产生一延迟的副索赔,采用Laplacc变换方法,给出了索赔额服从轻尾分布时的最终破产概率,并研究了重尾分布时最终破产概率的渐进式.  相似文献   

水稻田中氮肥损失研究进展   总被引：15，自引：6，他引：15  

尹娟  费良军  田军仓  王艳芳  韩丙芳  张学科  勉韶平 《农业工程学报》2005,21(6):189-191

综述了水稻田中氮肥损失及减少氮肥损失的措施。主要涉及稻田中氮肥的损失途径、损失程度、测试方法及减少氮肥损失的主要措施。这些措施有实施生态农业政策、优化氮肥管理,包括确定适宜的施氮量,氮肥深施,根据水稻生育期需肥特点合理运筹,平衡施肥,控施(缓施)肥料的应用等。  相似文献   

高校图书馆文献传递服务模式研究——以南京农业大学图书馆为例     

高冕 《农业图书情报学刊》2012,(6):53-57

文献传递服务是近几年随着互联网的普及与数字信息资源的迅速增长而发展起来的文献服务形式,是图书馆资源共享的主要形式之一。以南京农业大学图书馆为依托,对文献传递平台整合系统提出了"一站式"服务的设想,并进行了实验性系统的设计与开发。  相似文献