广东莲花山不同海拔梯度下森林土壤养分和化学计量特征

为探究广东莲花山土壤有机碳（C）、氮（N）、磷（P）、钾（K）含量垂直分布特征,阐明土壤C、N、P、K生态化学计量学特征对海拔梯度的响应规律,在广东莲花山500~1 000 m区域以100 m海拔间隔进行研究。结果表明：（1）不同海拔下土壤有机碳、全氮、全磷、全钾变化范围分别是38.72~68.17、0.90~1.32、0.011~0.022、5.19~7.08 g·kg-1,土壤全氮、全磷含量随海拔梯度升高而增加,土壤有机碳、全钾含量随海拔梯度的变化,差异不显著。（2）土壤的C/N和N/P分别介于40.12~50.76、43.06~90.86间。不同海拔梯段下土壤C/N无显著差异;整体来看,土壤N/P随海拔梯度的增加呈降低趋势。（3）500~1 000 m海拔土壤速效氮含量介于0.81~2.01 mg·kg-1,均值为1.19 mg·kg-1,其中,500 m海拔下土壤速效氮含量最高,1 000 m海拔下,土壤速效氮含量值达到最小。土壤速效氮含量与土壤速效氮含量的关系呈负相关。土壤速效钾、速效磷含量在500~800 m海拔间变化幅度较小,至900 m海拔下最大。莲花山土壤养分空间分布具有一定的异质性,全氮、全磷、速效氮含量、N/P的空间变化强烈。

Soil Nutrients and Stoichiometric Characteristics along Altitude of Lianhua Mountain in Guangdong Province

In the current study, we evaluated the status of soil carbon (C), nitrogen (N), phosphorus (P) andpotassium (K), and also the C, N, P ecological stoichiometry along the altitude within the range from 500 m to1 000 m (100 m altitude span) in Lianhua mountain. The results showed that the concentration of organic C, total N,total P, total K at different altitude varied in the range of 38.72~68.17, 0.90~1.32, 0.011~0.022, 5.19~7.08 g·kg,respectively. The content of total N and total P generally increased with increased altitude, while organic C andtotal K concentration had relatively little variation. Soil C/N ratio and N/P ratio varied between 40.12 and 50.76,43.06 and 90.86, respectively. There was no signi?cant difference in soil C/N ratio among the different altitude within 500 m to 1 000 m. In general, soil N/P ratio tended to decrease with the increased altitude. Soil available N ranged from 0.81 to 2.01 g·kg along the altitude of 500~1 000 m, with an average of 1.19 g·kg. Along the altitude, soil available N tended to decline with rising altitude from 500 to 1 000 m. Soil available K and P were in the highest values at the altitude of 900 m, but ?uctuates a little within the altitude of 500~800 m.