海南文昌3种森林类型凋落物及土壤有机碳现状分析

针对海南文昌滨海台地3种森林类型(人促更新次生林、次生林、椰子林)林下枯落物现存量及土壤活性有机碳性状(有机碳、易氧化有机碳及轻组有机碳含量)进行了测定。结果如下:3种林型凋落物层现存量及总碳储量分别为:椰子林4.53、1.51 t/hm2;次生林1.76、0.65 t/hm2;人促更新次生林1.53、0.60 t/hm2;均为分解层(包括半分解层和全分解层)未分解层。1 m深土层深度内,3种林型土壤SOC、EOC及LFOC含量变化规律一致,均呈下降趋势,且不同林型不同土层间各组分含量差异显著(p0.05)。经相关性分析表明,土壤SOC、EOC及LFOC相互之间具有显著正相关。说明在土壤母质、土壤类型、气候条件基本一致条件下不同植被类型土壤碳库组分比例及变化规律相似,但土壤各组分含量大小各异,从土层分布情况来看,林下凋落物质量和人为因素是碳储量关键影响因子。

Litter and Soil Soluble Organic Carbon Feature of Three Vegetation Types in Wenchang, Hainan Island

The forest litter amount and soil active organic carbon properties(SOC, EOC and LFOC content)of 3 vegetation types(human erythropoietin updated forest, secondary forest, coconut grove)in coastal platform in Wenchang, Hainan Island were measured. The results were as follows: the litter volume and carbon storage of the three forest types were: coconut grove 4.53 t/hm2 and 1.51 t/hm2, secondary forest 1.76 t/hm2 and 0.65 t/hm2, human erythropoietin update secondary 1.53 t/hm2 and 0.60 t/hm2; And the two prameters in the decomposed layer (including semi-decomposed layer and fully-decomposed layer) were greater than that of the composed layer; Deepened within 1 m soil, the values of the three soils showed a downward with obvious difference. Correlation analysis showed that SOC, EOC and LFOC were positiviely related, meaning the composition and the change rof the organic cabon pool in the soils of the three vegetation types were in same rule as the soil parent material, soil type and climatic conditions were similar, with variation for different value, and forest litter quality and human factors are the key factors to carbon reserves.