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磷素循环作为陆地生态系统对全球变化响应的关键过程之一,其研究还存在很大的不确定性。本文以长白山阔叶红松林为研究对象,采用长期野外施氮降水控制实验手段,分析了施氮和降水控制第6年优势树种红松和蒙古栎根际土壤全磷和有效磷浓度的变化。结果显示:长期施氮显著提高根际土壤全磷浓度7.4%~10.9%,两个树种根际土壤全磷浓度差异不显著;长期施氮显著提高根际土壤有效磷浓度,红松和蒙古栎根际土壤有效磷浓度分别提高25.1%和32.4%;蒙古栎根际土壤有效磷浓度比红松高31.8%~84.1%。减水处理对红松和蒙古栎根际土壤全磷、有效磷浓度影响均不显著。
As one of the key processes of response of terrestrial ecosystems to global changes, the study of phosphorus cycling has great uncertainty. In this paper, taking Changbai Mountain broad-leaved Korean pine forest as research object, the long-term field experiment of nitrogen application was used to study the changes of total phosphorus and available phosphorus in dominant rhizosphere soil of Pinus koraiensis and Quercus mongolica in the 6th year after nitrogen and precipitation control. The results showed that long-term application of nitrogen increased significantly the total phosphorus concentration in rhizosphere soil by 7.4% -10.9%, and there was no significant difference in total rhizosphere soil total phosphorus concentration between two species. Long-term nitrogen application significantly increased rhizosphere soil available phosphorus, Rhizosphere soil available phosphorus concentration increased by 25.1% and 32.4% respectively; Rhizosphere mongolia oak rhizosphere soil available phosphorus concentration was 31.8% ~ 84.1% higher than that of Korean pine. Water-reducing treatment had no significant effect on total phosphorus and available phosphorus in rhizosphere of Pinus koraiensis and Quercus mongolica.