黄土高原南北样带刺槐林土壤碳、氮、磷生态化学计量特征

Ecological stoichiometry characteristics of soil carbon, nitrogen, and phosphorus of the Robinia pseudoacacia forest on the north-south strip of the Loess Plateau

为了解黄土高原南北样带刺槐林土壤碳(C)、氮(N)、磷(P)化学计量特征,采集了黄土高原南北样带上12个典型样点的刺槐林土壤,测定了土壤有机碳(SOC)、全氮(TN)、全磷(TP)含量并分析其生态化学计量特征。结果表明:刺槐林土壤SOC、TN、TP含量均随降水量降低而降低,且土壤SOC与TN的空间变化具有一致性;土壤SOC、TN、TP及其生态化学计量比与降雨量呈显著正相关(P<0.05),且TN、C∶P、N∶P与土壤含水量也呈显著正相关(P<0.05)。

This study collected 12 typical soil samples from the Robinia pseudoacacia forest on the north south strip of the Loess Plateau to understand the ecological stoichiometric characteristics of its soil carbon(C),nitrogen(N),and phosphorus(P).The contents of soil organic carbon(SOC),total N,and total P were determined,and their ecological stoichiometric characteristics were analyzed.The results showed that the content of SOC,total N,and total P in the Robinia pseudoacacia forest decreased with a decrease in precipitation,including the spatial variation in the SOC and total N.The soil C,N,P,and their ecological stoichiometries were significantly positively correlated with precipitation(P<0.05),and there was a significantly positive correlation between the total N,C∶P,N∶P,and soil water content(P<0.05).