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时间:2019-08-08
《华南典型人工林凋落物的持水特性》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、植物生态学报2005,29(3)415一421Acta刀ytoecologicaSinlca华南典型人工林凋落物的持水特性薛立何跃君屈明吴敏徐燕(华南农业大学林学院,广州510642)摘要对于华南地区的杉木(Cwtnin动amialanceolata)林、马尾松(Pinesmassoniona)林、湿地松(Pintselliouii)林、马占相思(Acaciamangium)林和尾叶按(Eucalyptuswophylla)林的凋落物的储量、持水量、持水率和吸水速率进行了研究。结果表明,杉木林的凋
2、落物的干重((6.5x103kg.hnm-2)最大,其次是马尾松林和马占相思林(5.5x103kg-hm-2),而湿地松林((4.1x103kg.hm-2)和尾叶按林较小((4.0x103kg.hm-2)。凋落物持水量呈现杉木林>马占相思林>尾叶按林>马尾松林>湿地松林。各林分凋落物的最大持水量为杉木林17.9x1护掩.hm-2,马占相思林14.8x103吨.hM-2,尾叶按林14.0x103掩.hm-2,马尾松林10.6x103掩.hm-2,湿地松林9.8x103吨,hM-2。尾叶按林、杉木林、
3、马占相思林、湿地松林和马尾松林的凋落物最大持水率分别为351%,274%,269%,235%和191%.凋落物持水量和凋落物持水率随着浸泡时间的增加按照对数方程增加。5种林分中尾叶按林的凋落物吸水速率在各浸泡时间后居首位,杉木林和马占相思林中等,湿地松林较小,而马尾松林最小,各林分的凋落物的吸水速率随浸泡时间的增长按方程Y=a+b"t一’下降。关键词人工林凋落物储量凋落物持水量凋落物持水率凋落物吸水速率WATERHOLDINGCHARACl'ERISTICSOFLr'11'ERINPLANTATI
4、ONSINSOUTHCHINAXUELiHEYue-JunQUMingWUMinandXUYan(CollegeofForestry,SouthChinaAgriculturalUnimrs勿,Cuangzhu510642,China)AbstractLittercharacteristics,suclasstandingcrop,waterholdingcapacity,andponalwaterhold-ingcapacityandabsorptionrates,westudiedinplan
5、tationsaria,Pinuselliottii,Acaciamangium.ThedrylitterstandingcropofCplantationwasthelargest(6.5x1W一2);thefiveplantations,followed场andA.mangiumplantations(5.hm一2),山e尸.theE.urophyllaplantation(4.0x103kg"hm一2).Theorderoftotalwaterholdingcapacityoflitterw
6、asC.lanceolataplantation(179x1护吨·8x103吨.hm一2)>E.uro-phyllaplantation(14.0x103雌·hm-6x1护kg"Inn一2)尸.elliottiiplantation(9.8x103kg·hm一2).apercentageofthelitittterer师weightinE.urophylla,C.lanceolata,A.确angium,P.elliottiiand尸刀瓦砧:0几uz几a)nswere351%,274%,269%,
7、235%and191%,respectively.Thetotalwaterholdingcapacityandprop。。onrtTonalwaterholdingcapacityoflitterincreasedlogarithnucallywithincreasingtimeimmersedinwater.Thewaterab-sorptionrateoflitterinE.urophyllaplantationwasthelargestamongthefiveplantations,med
8、iumintheC.lanceolataandA.mangiumplantations,lowerintheP.elliottiiplantation,andlowestintheP叮wss0几乙~anaplantation.WaterabsorptionratesoflitterinallplantationsaccordingtoequationY=a+b·t一1withincreasingtimeimmersedinwater.KeywordsPlantation,Litte
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