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时间:2019-03-07
《南亚热带7种林分凋落叶养分含量的年动态变化》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、第45卷第4期林业科学Vo1.45.No.42009年4月SCIENTL~SILVAESINICAEApr.,2009南亚热带7种林分凋落叶养分含量的年动态变化*卢立华蔡道雄贾宏炎何日明(中国林业科学研究院热带林业实验中心凭祥532600)摘要:2006—05—20o7—04对广西凭祥市7种主要林分凋落叶的N,P,K,Ca及Mg含量进行分析。结果表明:林分凋落叶的N,P,K,Ca及Mg含量全年月份动态变化趋势较为一致;在林木生长旺盛的高温雨季4—9月,林分凋落叶的N及P养分含量较高,而K的含量较低;在林木生长缓慢或
2、休眠的干旱低温季10月至翌年3月,凋落叶N及P养分的含量较低,而K的含量较高,说明林分凋落叶的N与P含量与林木生长量成正相关,而K与生长量成负相关;Ca随月份的变化较小,但不同林分之间的差异较大;Mg随月份的变化较大;西南桦凋落叶N含量最高(14.44g·kg),火力楠最低(5.11g·kg);次生林河落叶P含量最高(1.20g·kg),马尾松最低(仅0.53g。kg);K也以次生林最高(5.16g·kgI1),马尾松最低(1.71g·kgI1);Ca以杉木最高(达l1.10g·kg),马尾松最低(仅3.76g·k
3、g);Mg以次生林最高(3.03g-kgI1),马尾松最低(1.18g·kg);7种林分凋落叶的N,P,K,Ca与Mg的最高与最低含量比值都超过2。关键词:南亚热带;林分凋落叶;养分含量中图分类号:$718.554.2文献标识码:A文章编号:1001—7488(2009)04—0001—06AnnualVariationsofNutrientConcentrationoftheFoliageLittersFromSevenStandsintheSouthernSubtropicalAreaLuLihuaCaiDao
4、xiongJiaHongyanHeRiming(TheExperimentalCenterTropicalForestry,CAFPingxiang532600)Abstract:Tostudythemonthlydynamicsofforestleaflitterfall,theleaflittersof7forestsinPingxiangofGuangxiwerecollectedandtheirchemicalcomponents(N,P,K,CaandMg)weredeterminedduringthep
5、eriodfromMayof2006toAprilof2007.Theresultsindicatedthatthemonthlyvariationsofleaflitter’snutrientcontentsofN,P,K,CaandMginleaflittersfromsevenstandshadcommontrends.ThecontentsofNandPintheleaflitterfallwerehigh,whilethecontentofKwaslowintherainseason(fromAprilt
6、oSeptember)whenthetemperaturewashighandtreesgrewvigorously.Bycontrastinthedryseason(fromOctobertonextMarch)whenthetemperaturewaslowandtreesgrewslowlyorwasindormancy,theconcentrationofKwashigh.andthecontentsofNandPwerelowintheleaflitterfal1.ItsuggestedthatNandP
7、concentrationsinthe1eaflitterfal1werepositivelyrelatedtogrowthoftree,whereastheconcentrationofKinfoliagelitterwasnegativelyrelatedwiththetree’sgrowth.ThecontentofCawasstablealltheyearwithinaforest,howeveritvariedsignificantlyfromonestandtoanother.Themonthlyvar
8、iationofMginleaflitterfallfluctuatedsignificantly.Theleaflitterfall’snutrientcontentsofdifierentforestsvariedgreatly.ThehighestcontentofN(14.44g‘kg)occurredinBetulaalnoidesplantati
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