Chin J Plan Ecolo ›› 1997, Vol. 21 ›› Issue (4): 335-341.

• Research Articles • Previous Articles     Next Articles

The Dynamics of Soil Nh4+-N and NO3--N in a Pine Forest of Dinghushan, as Assessed by Ion Exchange Resin Bag Method

Mo Jiangming, Yu Mengde and Kong Guohui   

  • Published:1997-04-10
  • Contact: Chen Xiaoyong and Song Yongchang

Abstract: The dynamics of soil NH4+-N and NO3--N in a pine forest of Dinghushan were investigated using ion exchange resin bag method. Soil NH4+-N and NO3--N both exhibited significantly seasonal variations, with the highest in spring and the lowest in summer. In the soil at 0~10 cm and at 10~20 cm depth, the mean values of soil NO3-N were 1. 722 and 1.429 μg·d-1· g-1 dry resin, respectively. However, in the soil at 0~10 cm and at 10~20 cm depth, the mean values of soil NH4+-N were 19.137 and 14.696 μg·d-1· g-1 dry resin, respectively. NO3--N was positively correlated with NH4+-N at both soil depths for most seasons (P<0.05) ,indicating the importance of ammonium supply in regulating nitrification rates.