海南岛不同林分植物叶片-土壤生态化学计量特征

C,N and P Stoichiometric Characteristics of Leaf and Soil for Two Typical Forest in Hainan Island

碳(C)、氮(N)和磷(P)是陆地生态系统中生物地球化学循环的关键元素,深入认识海南岛典型森林类型植物-土壤系统中的C、N、P生态化学计量对热带地区森林可持续性研究至关重要。研究通过测定原始林和次生林2种林分中植物叶与土壤的C、N、P含量,掌握热带区域典型森林植物叶和土壤生态化学计量特征。结果显示:(1)2种林分C、N含量差异显著,P含量无明显差异,其中各林分植物叶C、N、P含量均高于土壤。(2)2种林分C/N、C/P、N/P表现为植物叶>土壤,其中C/P、N/P在不同林分间均表现为原始林>次生林;各林型植物叶N/P含量范围为16.11~56.77,均高于全国森林平均值,说明2种林型植物的生长倾向于受P的限制。(3)研究范围内植物叶和土壤C含量在2种林分中呈显著正相关,其余指标无明显相关性。研究结果为了解热带区域森林生态系统的养分状况和揭示植物与土壤生态化学循环过程提供数据支持。

Carbon(C),nitrogen(N),and phosphorus(P)are key to biogeochemical cycles in terrestrial ecosystems.Deep understanding the stoichiometry of plant-soil C,N and P is critical for forest sustainability research of tropical area.The characteristics of leaf-soil ecological stoichiometry in the typical forest were studied by measuring the contents of leaf and soil C,N and P concentrations.The results showed that:(1)C and N contents of two forests were significantly different,and no significant difference in P content,among which the contents of C,N and P of leaf were all higher than soil in each forest type.(2)The C/N,C/P and N/P of two forest types basic presented in the order of leaf>soil,among them,C/P and N/P in different forest types were in primary forest>secondary forest.The leaf N/P content of various forest types ranged from 16.11 to 56.77,which were all higher than the average value of national forest.The results indicated that the growth of the two forest type plants tended to be restricted by P.(3)There was a significant positive correlation between the contents of plant leaves and soil C in the two forest types, but no significant correlation between the other indexes. The results provide data support for understanding the nutrient status of forest ecosystems in tropical regions and revealing the eco-chemical cycling process of plants and soils.