西南地区3种典型人工林土壤有机碳的含量差异  

Difference of Organic Carbon Content in Soil of Three Typical Plantations in Southwest China

作　　者：勾昕[1] 万秀美 廖昕荣[1] 刘迅[1] 

机构地区：[1]贵州师范学院地理与旅游学院喀斯特生态系统过程与演变研究所,贵州贵阳550018

出　　处：《贵州农业科学》2015年第8期151-155,159,共6页Guizhou Agricultural Sciences

基　　金：国家自然科学基金青年项目"基于生态化学计量学的喀斯特生态学系统退化的阶段性特征及其驱动机制研究"(41301608);贵州省科学技术基金项目"武陵山区人工林植被和凋落物对其土壤碳汇功能的影响及机制"[黔科合J字(2013)2237]

摘　　要：为探明喀斯特地区土壤的性质,以贵州省石阡县本庄镇的杉木、杨树2种人工林以及该区域重要经济林李子林为研究对象,分析了不同土层轻重组有机碳浓度、有机碳含量以及有机碳在轻组中分配比例等在3种人工林间的差异。结果表明：杨树人工林0～10cm土层轻组有机碳浓度最高,为227.56g/kg,而杉木最低,为154.48g/kg;杨树和杉木人工林0～10cm土层轻组有机碳含量分别为1.21g/kg和1.22g/kg,显著高于李子人工林的0.78g/kg;在0～10cm土层,杉木人工林轻组有机碳的分配比例显著高于其他2种人工林类型;0～10cm和10～20cm土层,杉木人工林重组有机碳含量分别为9.74g/kg和8.17g/kg,显著低于其他2种人工林。对于0～10cm土层,杉木人工林土壤有机碳稳定性和含量较低,其碳汇功能较差,李子人工林在0～20cm土层林累积的有机碳较多,但相比其他2种人工林,其分解的速率也较快。The difference in light fraction organic carbon concentration, heavy fraction organic carbon concentration and organic carbon content of different soil layers and distribution ratio of organic carbon in light fraction among Cunninghamia lanceolata, Populus deltoids and Prunus salicina plantations were analyzed in Benzhuang Town, Shiqian County, Guizhou to explore soil property in karst area. Rseults.. Light fraction organic carbon concentration in soil layer with 0～ 10 cm depth of P. deltoids plantation is the maximum （227.56 g/kg） but light fraction organic carbon concentration in soil layer with 0～ 10 cm depth of C. lanceolata plantation is the minimum （154.48 g/kg）. Light fraction organic carbon content in soil layer with 0 ～ 10 cm depth of P. deltoids plantation and C. lanceolata plantation 1. 21 g/kg and 1.22 g/kg respectively, significantly higher than P. salicina plantation （0.78 g/kg）. The distribution ratio of light fraction organic carbon in soil layer with 0～10 cm depth of C. lanceolata plantation is higher than other two plantations significantly. The heavy fraction organic carbon content in soil layer with 0～10 cm andl0～20 cm depth of C. lanceolata plantation is 9.74 g/kg and 8.17 g/kg respectively, lower than other two plantations significantly. The carbon sink capacity of soil layer with 0～10 cm depth of C. lanceolata plantation is poor because of its low stability and content of organic carbon. Accumulation of organic carbon in soil layer with 0～20 cm depth of P. salicina plantation is higher than other two plantations but its degradation speed is faster than other two plantations.

关 键 词：土壤有机碳 密度组分 轻组有机碳 西南地区人工林 

分 类 号：S714.8[农业科学—林学]