Early responses of soil fauna in three typical forests of south subtropical China to simulated N deposition addition

Abstract

Abstract: In this paper,simulated N deposition addition (0,50,100 and 150 kg穐m^-2穣r^-1) by spreading water or NH₄NO₃ was conducted to study the early responses of soil fauna in three typical native forests (monsoon evergreen broadleaf forest,pine forest,and broadleaf-pine mixed forest) of subtropical China.The results showed that in monsoon evergreen broadleaf forest,N deposition addition had an obviously negative effect on the three indexes for soil fauna,but in pine forest,the positive effect was significant (P<0.05),and the soil fauna community could reach the level in mixed forest,even that in monsoon evergreen broadleaf forest at sometime.The responses in mixed forest were not obvious.In monsoon evergreen broadleaf forest,the negative effects were significant (P<0.05) under medium N deposition,but not under low N deposition.In pine forest,the positive effect was significant (P<0.05) under high N deposition,especially for the number of soil fauna groups.The results obtained might imply the N saturation-response mechanisms of forest ecosystems in subtropical China,and the conclusions from this study were also consisted with some related researches.

Key words: N deposition addition, South subtropics, Forests, Soil fauna

CLC Number:

Q958.15

XU Guoliang, MO Jiangming, ZHOU Guoyi . Early responses of soil fauna in three typical forests of south subtropical China to simulated N deposition addition[J]. Chinese Journal of Applied Ecology, 2005, 16(7): 1235-1240.

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