不同林型土壤有机碳及腐殖质组成的分布特征

Distribution Characteristics of Soil Organic Carbon and Humus Composition in Different Forest Types

为探讨不同类型人工固沙林下土壤有机碳的差异,以辽宁省章古台沙地5种林型下土壤为研究对象,运用统计学的方法对0—5,5—10,10—20,20—40cm土层有机碳、全氮、腐殖质组分分布特征进行比较分析。结果表明:在各林型0—40cm土层上,土壤有机碳含量变化特征为樟子松纯林(4.72g/kg)>怀槐樟子松(4.48g/kg)>榆树樟子松(4.38g/kg)>云杉樟子松(4.21g/kg)>杨树纯林(3.95g/kg)>对照(1.88g/kg);有机碳储量表现为怀槐樟子松(20.00t/hm^2)>樟子松纯林(19.92t/hm^2)>榆树樟子松(19.06t/hm^2)>云杉樟子松(17.31t/hm^2)>杨树纯林(16.61t/hm^2)>对照(8.44t/hm^2);经腐殖质组分分析发现土壤腐殖质碳含量表现为云杉樟子松(2.04g/kg)>榆树樟子松(1.93g/kg)>樟子松纯林(1.74g/kg)>杨树纯林(1.65g/kg)>怀槐樟子松(1.58g/kg)>对照(0.75g/kg)。各林型土壤有机碳含量与全氮、腐殖质碳、胡敏酸、富里酸均呈极显著的正相关关系。

In order to investigate the difference of artificial sand-fixation forest models on soil organic carbon（SOC）,taking the soil as the research object under the 5 forest models in Zhanggutai sandy land of Liaoning province.We compared the distribution characteristics of SOC,nitrogen,and humus in 0—5 cm,5—10 cm,10—20 cm,and 20—40 cm soil layers through statistical methods.The results showed that the change of SOC content was as follows：Pinus sylvestris pure forest（4.72 g/kg）〉Mixed forests of Maackia amurensis and Pinus sylvestris（4.48 g/kg）〉Mixed forests of Elmand Pinus sylvestris（4.38 g/kg）〉Mixed forests of Spruce and Pinus sylvestris（4.21 g/kg）〉Poplar forests（3.95 g/kg）〉CK（1.88 g/kg）in 0—40 cm soil layer;The comparation of organic carbon storage was expressed as：Mixed forests of Maackia amurensis and Pinus sylvestris（20.00 t/hm^2）〉Pinus sylvestris（19.92 t/hm^2） Mixed forests of Spruce and Pinus sylvestris（19.06 t/hm^2）Mixed forests of Elmand Pinus sylvestris（17.31 t/hm^2〉）Poplar forests（16.61 t/hm^2）CK（8.44 t/hm^2）;The analysis of humus components found that soil humus carbon content was expressed as：Mixed forests of Spruce and Pinus sylvestris（2.04 g/kg）〉Mixed forests of Elmand Pinus sylvestris（1.93 g/kg）〉Pinus sylvestris（1.74 g/kg）〉Poplar forests（1.65 g/kg）〉Mixed forests of Maackia amurensis and Pinus sylvestris（1.58 g/kg）〉CK（0.75 g/kg）.There were significant positive correlations between SOC and TN,HC,HA and FA.