土地利用方式及母质对土壤有机碳的影响  

Effects of land use change and soil parent material on soil organic carbon

作　　者：邓万刚[1] 吴蔚东[1] 陈明智[1] 夏福君[1] 

机构地区：[1]海南大学农学院,海南海口570228

出　　处：《生态环境》2008年第3期1130-1134,共5页Ecology and Environmnet

基　　金：海南大学省级;校级重点学科科研项目(hdzx08-38);国家自然科学基金项目(40461010)

摘　　要：运用物理分组方法分别对海南屯昌县花岗岩砖红壤地区天然次生林(白楸(Mallotuspaniculatus(Lam.)Muell.Arg.)、岭南山竹子(GarciniaoblongifoliaChamp.))土壤(TSF)和人工橡胶RRIM600(Heveabrasiliensis.Muell.Arg.)林土壤(TR)以及白沙县紫色砂页岩砖红壤地区天然次生林(白楸(Mallotuspaniculatus(Lam.)Muell.Arg.)、岭南山竹子(Garciniaob-longifoliaChamp.))土壤(BSF)和人工橡胶RRIM600(Heveabrasiliensis.Muell.Arg.)林土壤(BR)0～100cm土层土壤及其物理组分中的有机碳进行了研究,分析利用方式从天然次生林变为人工橡胶林后不同母质砖红壤及其物理组分有机碳含量变化。结果表明:TSF和TR土壤有机碳分别比BSF和BR土壤有机碳含量高。无论是花岗岩砖红壤还是砂页岩砖红壤,土地利用变化使土壤和微团聚体有机碳含量都极显著降低,TSF变为TR后还造成大团聚体以及粘粒和粉粒(Silt&clay)有机碳显著减少,可以看出土地利用变化引起的花岗岩砖红壤退化程度比砂页岩砖红壤大。土地利用变化主要对第一、二层土壤及其物理组分产生影响,且对第一层影响比第二层大。对比研究发现,砂页岩砖红壤CoarsePOM和iPOM组分中有机碳稳定性比花岗岩砖红壤相应物理组分强。The effect of converting natural continue secondary forest （Mallotus panicldatus （Lam,） Muell. Arg.） and Galvinia oblongifolia Champ. ） to rubber RR1M600 （Hevea brasiliensis. Muell, Arg.） on the soil organic carbon （SOC） of Ferric Aerisols developed from granite and sandstone were studied using physical fractionation methods,soil samples were taken from rubber land in Tunchang （ TR ） Ferric Acrisols area developed from granite and from rubber land in Baisha （ TR ） Ferric Acrisols area developed from sandstone （ BR ） . Soil from adjacent continuous natural secondary forestS in Tunchang （ TSF ） Ferric Acrisols area developed from granite and in Baisha （ BSF ） Ferric Acrisols area developed from sandstone was also taken for comparison. The result showed that the content of soil organic carbon（SOC） of TSF and TR are greater than BSF and BR, respectively. The conversion of natural secondary forests into rubber forest on both Ferric Acrisols deveoped from granite and sandstone cause remarkablely significant decrease of SOC of microaggregates （ m and mM ）, Land use change from TSF to TR caused an obvious decrease of SOC content of macroaggregates and silt＆clay fractions, then can infer that the degradatin of Ferric Acrisols deveoped from granite is greater than latosols deveoped from sandstone caused by land use change. The influence of Land use change on surface layer （0- 10 cm） soils and physical fractionations are greater than second layer（10 - 20 cm） soils and relative fractionations. The comparison of the SOC content ofTSF, TR, BSF and BR and those physical fractionations infer that stabilization of SOC of Coarse POM 和 iPOM in Ferric Acrisols deveoped from sandstone is stronger than that of relative fractionations in Ferric Acrisols deveoped from granite.

关 键 词：土地利用变化 土壤母质 土壤有机碳 物理组分 

分 类 号：X144[环境科学与工程—环境科学]