长期施氮与减水处理对红松和蒙古栎根际磷浓度的影响  

Influence of long-term nitrogen fertilization and precipitation reduction on rhizospheric phosphorus concentration of Pinus koraiensis and Quercus mongolica

作　　者：杨建华[1,2] 王芳[1,2] 张军辉[1] 岳琳艳 朱保坤[3] 耿世聪[1,2] 王秀秀 韩士杰[1] 

机构地区：[1]森林与土壤生态国家重点实验室中国科学院沈阳应用生态研究所,沈阳110016 [2]中国科学院大学,北京100049 [3]东北师范大学,长春130024 [4]长白山森林生态系统定位研究站,吉林安图133613

出　　处：《生态学杂志》2015年第10期2699-2704,共6页Chinese Journal of Ecology

基　　金：国家重点基础研究发展计划项目(2011CB403200);国家自然科学基金项目(41430639;41330530)资助

摘　　要：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。Understanding changes in soil phosphorus concentration is critical to predict the influ- ence of long-term environmental change on forest ecosystems. By measuring total phosphorus and available phosphorus concentrations in rhizospheric soil of Pinus koraiensis and Quercus mongolica in the sixth-year nitrogen and precipitation manipulation experiment, we intended to study the in- fluence of long-term nitrogen deposition and precipitation variation. The results showed that long- term nitrogen fertilization significantly increased the total phosphorus concentration in rhi- zospheric soil by 7.4%-10.9%, and the influence of tree species on total phosphorus concentra- tion in rhizospherie soil was not significant. Long-term nitrogen fertilization significantly increased the available phosphorus concentration in rhizospheric soil of P. koraiensis and Q. mongolica by 25.1% and 32.4%, respectively. The available phosphorus concentration in rhizospheric soil of Q. mongolica was 31.8%-84.1% higher than that of P. koraiensis. The reduction in precipitation had no significant effects on both total phosphorus and available phosphorus concentrations in rhi- zospheric soil.

关 键 词：氮沉降 降水减少 树种 全磷浓度 有效磷浓度 根际土 野外控制实验 

分 类 号：S714[农业科学—林学]