大岭山森林公园不同海拔土壤碳氮磷化学计量特征研究

Chemical Stoichiometric Characteristics of Soil Carbon,Nitrogen,and Phosphorus at Different Altitudes in Dalingshan Forest Park

森林土壤碳氮磷化学计量特征是土壤养分的供应能力、评估土壤质量以及预测生态系统响应的重要指标。研究以大岭山森林公园为研究对象,在5个海拔梯度设置26个调查样点进行不同海拔土壤碳氮磷化学计量特征分析,结果表明:土壤有机碳及氮含量均随海拔上升逐渐增加,土壤磷含量则为先增大后减小的变化趋势;土壤氮磷比、碳磷比均为随海拔上升呈增大趋势;碳氮比整体差异不大,反映为全区域碳限制;海拔与土壤氮含量、有机碳含量、土壤碳氮比呈显著的相关关系,显示碳、氮同为影响森林公园森林生态系统的关键因子。

The stoichiometric characteristics of carbon,nitrogen,and phosphorus in forest soil are important indicators for assessing soil nutrient supply capacity,evaluating soil quality,and predicting ecosystem responses.This study took Dalingshan Forest Park as the research object,and set up 26 survey sites in five altitude gradients within the park to study the stoichiometric characteristics of soil carbon,nitrogen,and phosphorus at different altitudes.The results showed that:at different altitude gradients,both soil organic carbon and nitrogen content gradually increased with increasing altitude,while soil phosphorus content first increased and then decreased;soil nitrogen to phosphorus ratio and carbon to phosphorus ratio increased with the increase of altitude,while carbon to nitrogen ratio was relatively stable,indicating that the whole area was limited by carbon.Altitude had a significant correlation with soil nitrogen content,organic carbon content,and soil carbon to nitrogen ratio,indicating that carbon and nitrogen are both key factors affecting the forest ecosystem in Dalingshan Forest Park.