简介：Throughsampleplotsurveyandstatisticanalysis,thispaperadoptsecologicalmethodtostudythecharacteristicsofplantdiversityofforestvegetationinLuofuMountain,Guangdong.TheresultsshowthatthereisagreatplantdiversityofforestvegetationinLuofuMountainowingtotheascendancyofaqueousandthermalconditioninsubtropicalzone.Thetotalnumberofspeciesin4500m2sampleplot(s)are170with3870individualplantsintotal;Dahlspeciesrichnessindex(D)is44.932;Simpsondiversityindex(L,D)is0.022,0.022;Simpson(1982)diversityindex(D)is3.806;Pielouevennessindex(E)is0.984andHulbertevennessindex(E)is0.815;Shannon-wienerdiversityindex(informationindexH')is4.188;Asymmetryindex(r)is0.185.Theseindexesshowthatabetterhabitatwillbringaboutplantdiversityofforestvegetation,andthediversityofzonalvegetationshowsthatthehigherlatitudeis,thelessspeciesofvegetationcanbefound.Besides,verticalchangeofplantdiversityofforestvegetationinLuofuMountainisobvious.Itsspeciesrichnessindexandplantdiversityindexshowthatmonsoonevergreenbroad-leavedforestisthetallest,mountainevergreenbroad-leavedforestfollowsasthesecondandconifer-broad-leavedmixedforestistheshortest.TheWilsonβ-diversityindex,whichisobtainedbycomparisonbetweenforestvegetationbelow300mandforestvegetationbetween600-900m,is0.621.Calculatedfromcomparisonbetweenforestvegetationin600-1100mandforestvegetationin900-1100m,theWilsonβ-diversityindexis0.727;bycomparingforestvegetationbelow300mwithforestvegetationin900-1100m,theWilsonβ-diversityindexis1.877.Thisshowsthattheplantdiversityofforestvegetationisaffectedbythechangeingradientofelevation.

简介：１三棘华枝ＳｉｎｏｐｈａｓｍａｔｒｉｓｐｉｎｏｓｕｍＣｈｅｎｅｔＣｈｅｎ，ｓｐ．ｎｏｖ．本新种与臀沟华枝ＳｉｎｏｐｈａｓｍａｌａｔｉｓｅｃｔｕｍＣｈｅｎｅｔＣｈｅｎ近似，但本种雄性臀节端部较窄，纵沟浅裂．背面具有３个排列成倒三角形的锥形突，第９节背板隆起成直角下垂等不同，可相区别．模式标本保存在中山大学．２单棘华枝ＳｉｎｏｐｈａｓｍａｕｎｉｓｐｉｎｏｓｕｍＣｈｅｎｅｔＣｈｅｎ，ｓｐ．ｎｏｖ．本新种与三棘华枝ＳｉｎｏｐｈａｓｍａｔｒｉｓｐｉｎｏｓｕｍＣｈｅｎｅｔＣｈｅｎ近似，但本种雄性臀节较狭长，两侧端叶扩展成瓣状；端部无纵沟，背面具有１个明显的锥形突，下生殖板形状以及第９节背板明显不同等，可相区别．模式标本保存在中山大学．３拟异尾华枝（雌性）ＳｉｎｏｐｈａｓｍａｐｓｅｕｄｏｍｉｒａｂｉｌｅＣｈｅｎｅｔＣｈｅｎ本种发表于１９９６年，当时仅报道其雄性，近在中山大学昆虫标本馆发现１对雌雄，其雌性与异尾华枝ＳｉｏｎｐｈａｓｍａｍｉｒａｂｉｌｅＧüｎｔｈｅｒ雌性相似．但本种头部形状，第７腹节腹板与腹瓣伸至的位置，以及尾须的形状等明显不同，可与之区别．模式标本保存在北京林业大学和中山大学．

简介：Race-specificresistanceandfieldresistanceof30riceblastresistancemonogeniclinesderivedfromdifferentresourceswereevaluated.Thespectraofresistanceto163MagnaporthegriseaisolatescollectedfromindicariceinGuangdongProvince,Chinarangedfrom0.6%to89.6%.Mostofthemonogeniclinesshowedanarrowresistancespectrumandhighsusceptibilityinriceblastarea,whereasthelineswithPikhandPi1(t)hadthebroadresistancespectraof89.6%and82.2%respectively,showingahighandstableblastresistanceinfields.Accordingtotheclusteranalysisofspecificresistanceto163blastisolatestested,the30monogeniclinesweredividedinto15groups,andbasedontheprincipalfactoranalysis,ninekindsofrace-specificresistancewereidentified.Pik,Piz5,Pi9andPishcanbeusedascandidateresistancegenesforricebreedingsincetheirspecificresistancedifferedfromthoseofthebackboneparentsinGuangdong,China.GenepyramidingofPikh[orPi1(t)],Pi9(orPiz5)andPish(orPita2)willbeeffectivetoobtainbroad-spectrumblastresistanceinricebreedingprograminGuangdong,China.Thestrategiesforstudyingandapplicationofriceblastresistancegeneswerediscussed.

简介：Climatechangehasposedagreatriskandtreatstoglobalenvironment.Toaddresstheproblem,internationalcommunityresortstocarbonemissionreduction,andmanycountrieshaveimplementedafforestationandreforestationprojectunderCleanDevelopmentMechanism.Chinastartedtheresearchandhasdoneagreatloadofworksonforestcarbontradeasearlyastheyearof2002tocontributetothecarbonemissionreduction.ThispaperintroducestheimplementationofforestcarbontradeinHeyuanCity,Guan...