贵州省溶岩区植被类型对凋落物量、土壤有机碳及速效养分的影响  

Effects of Vegetation Types on Litter Accumulation,Soil Organic Carbon and Available Nutrients in Karst Region of Guizhou Province

作　　者：高晟[1] 吴永波[1] 薛建辉[1] 姚健[1] 

机构地区：[1]南京林业大学江苏省林业生态工程重点实验室,江苏南京210037

出　　处：《水土保持通报》2011年第5期7-12,共6页Bulletin of Soil and Water Conservation

基　　金：国家林业公益性行业科研专项"生境胁迫立地植被恢复与重建技术研究"(201104002)

摘　　要：在贵州省溶岩区的草地和人工林内设立1m×1m(乔木20m×20m)的样地,分析样方内凋落物积累量、凋落物碳氮含量、土壤速效养分含量、土壤有机碳(SOC)和可溶性碳(DOC)含量变化。结果表明,天然草地、杜仲林、刺槐林、冰脆李林、桤木林、滇柏林凋落物积累量依次为1.62,5.29,3.32,4.26,9.68和1.81t/hm2;与天然草地相比,人工植被的凋落物量为天然草地的1.12～5.98倍,在植被恢复条件下凋落物C/N由12.84提高到57.68。凋落物量对土壤速效钾含量有重要的影响,两者呈极显著的正相关关系,但仅仅具有较高的凋落物量不足以提高土壤碱解氮和有效磷含量。与天然草地(SOC含量7.28g/kg)相比,杜仲林、刺槐林、冰脆李林、桤木林和滇柏林的有机碳含量分别提高了5.24,12.14,6.04,8.93和6.78倍。凋落物量与土壤有机碳线性相关关系的拟合优度较低,凋落物积累量与0—10cm土层土壤可溶性碳存在显著线性相关关系,10cm以下线性相关关系的拟合优度较低。The accumulation amount of litter,litter carbon and nitrogen contents,soil available nutrients contents,soil organic carbon content（SOC）,and soil soluble carbon（DOC） content were studied in 1 m × 1 m（tree 20 m×20 m） plots of grasslands and plantations in Guizhou karst areas.The results indicate that the litter accumulation amounts under the plantations of E.ulmoides,R.pseudoacaciat,P.salicina,A.cremastogyne,and C.duclouxiana were 5.29,3.32,4.26,9.68,and 1.81 t/hm2;respectively,which were 1.12 to 5.98 times of that of the natural grassland.The C： N ratios of the litters increased from 12.84 to 57.68 after vegetation restoration.The litter accumulation amount correlated significantly positively with the soil rapidly-available potassium contents,rather than the soil hydrolysis nitrogen and effective phosphorus contents.Compared with natural grassland（SOC 7.28 g/kg）,the organic carbon content of the soils under E.ulmoides,R.pseudoacaciat,P.salicina,A.cremastogyne,C.duclouxiana increased by 5.24,12.14,6.04,8.93,and 6.78 times respectively.The soil organic carbon content showed no significant relationship with litter amount.However,the relationship between the accumulation amounts of litter and the soluble carbon contents was significant linear in 0—10 cm soil layers,but not in the layers below.

关 键 词：人工植被 凋落物 速效养分 土壤有机碳 土壤可溶性碳 

分 类 号：S152.4[农业科学—土壤学] S158.3[农业科学—农业基础科学]