简介:ForestmanagementisexpectedtoinfluencesoilCO2efflux(FCO2)asaresultofchangesinmicroenvironmentalconditions,soilmicroclimate,androotdynamics.SoilFCO2ratewasmeasuredduringthegrowingseasonof2006inboththinningandnon-thinninglocationswithinstandsrangingfrom0to8yearsafterthemostrecentthinninginChinesefir(Cunninghamialanceolata(Lamb.)Hook)plantationsinHuitongEcosystemResearchStation,Hunan,China.SoiltemperatureandmoisturewerealsomeasuredtoexaminerelationshipsbetweenFCO2andsoilproperties.ForestthinningresultedinhugechangesinFCO2thatvariedwithtimesincecutting.Immediatelyfollowingharvest(year0)FCO2inthinningareaincreasedbyabout30%,declinedto20%–27%belowpre-cuttinglevelsduringyears4–6,andrecoveredtopre-cuttinglevelsat8yearspost-cutting.Asimilartemporalpattern,butwithsmallerchanges,wasfoundinnon-thinninglocations.TheinitialincreaseinFCO2couldbeattributedtoacombinationofrootdecay,soildisturbance,andincreasedsoiltemperatureingaps,whilethesubsequentdecreaseandrecoverytothedeathandgradualregrowthofactiveroots.StrongeffectsofsoiltemperatureandsoilwatercontentonFCO2werefound.ForestthinningmainlyinfluencedFCO2throughchangesintreerootrespiration,andthenetresultwasadecreaseinintegratedFCO2fluxthroughtheentirefellingcycle.
简介:为明确一株云烟87八倍体(2n=8x=96)与N.plumbaginifoliaViv.(2n=2x=20)的杂交后代的部分生物学特性。对该后代进行了形态观测,细胞学遗传学分析,育性分析,并进行黑胫病抗性的离体鉴定。结果显示,该杂交后代(无性系)大部分外观形态指数介于云烟87四倍体与N.plumbaginifolia之间;花冠颜色与云烟87相近,花药颜色与N.plumbaginifolia相近。其染色体数目为58条,其中含有来自N.plumbaginifolia的10条染色体。花粉离体培养未见萌发;与云烟87四倍体杂交,做母本时坐果率为100%,平均每个蒴果获得102.60±25.12粒可萌发的种子,以其为父本及自交时未获得成熟蒴果。该杂交后代(无性系)对黑胫病抗性强于云烟87,与N.plumbaginifolia相近。综上所述,该杂交后代为云烟87与N.plumbaginifolia的真杂种(2n=5x=58);其雄性败育,但雌性可育;且具较强的黑胫病抗性。
简介:通过取代苯甲酸与N-羟乙基苯并异噻唑啉-3-酮反应,制备了6个未见文献报道的2-(苯并异噻唑啉-3-酮-2-基)芳香酯类化合物,其结构均经红外光谱、核磁共振氢谱、质谱及元素分析确认。采用比浊法测定了目标化合物对革兰氏阳性菌(枯草芽孢杆菌Bacillussubtilis、金黄色葡萄球菌Staphylococcusaureus、白色葡萄球菌Staphylococcusalbus)及革兰氏阴性菌(大肠杆菌Escherichiacoli、肺炎克雷伯菌Klebsiellapneumoniae及绿脓杆菌Pseudomonasaeruginosa)的抑菌能力。结果表明,绝大多数化合物对金黄色葡萄球菌和白色葡萄球菌表现出优良的生长抑制活性,其半数抑菌浓度(MIC50)约为4mg/L。
简介:为探索新的农药先导化合物,经取代苯基呋喃甲酰氯与5-羟基-3(2H)哒嗪酮反应,得到15个未见文献报道的含呋喃环3(2H)哒嗪酮类化合物,其结构均通过了红外光谱、核磁共振氢谱和元素分析确认。初步生物活性测定结果表明,目标化合物表现出良好的杀菌活性,其中化合物3i在50mg/L时对灰霉病菌和纹枯病菌的抑制率分别为89.16%±1.73%和81.27%±1.38%,与对照药剂腐霉利(88.58%±1.64%和79.62%±1.15%)相当。初步的构效关系结果显示,苯环上取代基的种类和位置对杀菌活性有重要影响。