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

YANG Jian-hua1,2, WANG Fang1,2, ZHANG Jun-hui1**, YUE Lin-yan1,2, ZHU Bao-kun3, GENG Shi-cong1,2, WANG Xiu-xiu4, HAN Shi-jie1   

  1. (1State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2University of Chinese Academy of Sciences, Beijing 100049, China; 3Northeast Normal University, Changchun 130024, China; 4The Research Station of Changbai Mountain Forest Ecosystems, Chinese Academy of Sciences, Antu 133613, Jilin, China)
  • Online:2015-10-10 Published:2015-10-10

Abstract: Understanding changes in soil phosphorus concentration is critical to predict the influence 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 influence 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 concentration in rhizospheric 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 rhizospheric soil.

 

Key words: Pinus tabuliformis, LPJ-GUESS model, climate change., net primary productivity