氮沉降对杉木人工林土壤化学计量特征的影响

摘要

Taking the simulated nitrogen deposition experiment field in a Chinese fir plantation Shaxian Guanzhuang State Forest Farm of Fujian Province as the researched object,this paper studied the responses of soil carbon,nitrogen,phosphorus and their sto-chiometric characteristics on nitrogen deposition.Which were 0,60,120 and 240 kg· hm-2 · a-1.The continuous 7-year-long exper-iment results showed that the simulated nitrogen deposition did not effect evidently on the soil carbon content,but increased soil ni-trogen concentration and ratios of N:P and decreased concentrations of soil phosphorus.The responses of stochiometric characteristics were mainly focused in the upper soil layer,which indicated that more attention should be paid to the upper soil biogeochemical cycle research in order to appropriately assess the effects of ecosystem on nitrogen deposition.%以福建沙县官庄国有林场杉木人工林模拟氮沉降试验平台为对象，研究土壤碳氮磷化学计量特征对氮沉降（N沉降量分别为0、60、120、240 kg· hm-2· a-1）的响应。连续7 a的试验结果表明：模拟氮沉降对土壤碳含量影响不显著，对土壤氮含量和氮磷比有增加作用而对土壤磷含量有减少作用。但模拟氮沉降的效应主要集中在表层土壤，表明加强对表层土壤生物地球化学循环研究可以更好地评价生态系统对氮沉降的响应。