松嫩平原不同生境芦苇种群分株的生物量分配与生长分析

应用生态学报2003年1月第14卷第1期CHINESEJOURNALOFAPPLIEDECOLOGY．Jan．2003，14(1)：30～34松嫩平原不同生境芦苇种群分株的生物量分配与生长分析*杨允菲一李建东(东北师范大学草地研究所植被生态科学教育部重点实验室，长春130024)【摘要】在松嫩平原8月中旬．4个旱地生境芦苇种群分株的生长和生产力以季节性临时积水的低洼地为最高，以碱斑地为最低．两个生境之间分株高度相差2．8倍，分株生物量相差4．4倍，其它2个生境沙地和草甸混生群落也达到了显著或极显著水平．不同生境芦苇种群分株生物量分配的差异，蕴涵着重要的生长调节和物质分配策略．在分株较小而又有充分生长空间的沙地生境和碱斑生境，以及具有种问竞争的草甸生境，分株将50％以上的物质分配给叶的建造上，以保证充分的物质生产；在环境条件相对较好的低洼地生境．分株将近40％的物质分配给茎的伸长生长，以提高个体对空间和光资源的竞争力．4个生境芦苇种群在分株增高与增重，以及茎、叶与分株的相对增重均具有相同的幂函数异速生长规律．关键词芦苇无性系植物分株生物量分配异速生长文章编号1001—9332(2003)01—0030—05中图分类号Q945．3，Q948文献标识码ABiomassallocationandgrowthanalysisontherametsofPhragmitesammumispopulationsindifferenthabitatsintheSongnenPlainsofChina．YANGYunfei，IIJiandong(btstitute口厂GrasslandScience，NortheastNor-malUniversity，CAangchun130024．(ina)．一Chin．J．App1．Eco1．，2002，14(1)：30～34、IntheSongnenPlainsofChina．thereedsgrowfastestinmiddleAugust．Inthisexperiment，fourresearchplotswerechoseninthearidhabitats．Thefirstplotwasdominatedbyreed。andinwhich，therewassomestagnantwaterinJulyandAugust．Therametsofreedsgrewsingly，andmostofthemcouldturnintoreproductivegrowth．Itscommunitycoveragewasmorethan95％afterthefastgrowingseasonofJuly、ThesecondplotwasLevmuschinensis+Phragmitescommu~l矗community，whereSoilwasalkalinemeadowwithstagnantwaterforashorttimeornot．Itscommunitycoveragewasmorethan90％．Twoorthreerametsgrewinatuft，whilemostofthemcouldn’tturntoreproductivegrowth，soreedswereusedtomakehaystoredinwintereveryyear．ThethirdplotwasonAeoliansandySoilwithgoodpermeabilityanddrainageonagrasslandofartificialforestedgeonsanddune．Itscommunitycoveragewasabout50％．andtwoorthreerametsgrewinatuft．Thel&stplotwasalkalinebaregroundpatches．wheretopSoilwaslostcompletely．Soilwashardandpermeabilitywaspoor．Onsomealkalinepatches，therecouldformamicro-communitydominatedbyreed，andeighttotwentyrametscouldgrowinatuft．Rametswereallslenderandcreepingstems．Itscommunitycoveragewasfrom20％to40％．Theresultsshowedthatfourmentionedhabitats．thegrowthandproductivityoftherametsofthepop．ulationswerethelargestinthelowlandandthesmalles