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JIANG Yi1, CHEN Li-xin1**, DUAN Wen-biao1, BU Fan1, SUN Shuang-hong1, LI Fan-fan1, XU Yi-fan2
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Abstract: The concentrations of different nitrogen (N) forms in soil (ammonium N (NH4+-N), nitrate N (NO3--N), total soluble N (TSN), soluble organic nitrogen N (SON), microbial biomass N (MBN) and total N (TN)) were investigated under gaps with different sizes in three Korean pine (Pinus koraiensis) mixed forests (i.e., TiliaKorean pine mixed forest, sprucefirKorean pine mixed forest, and birchKorean pine mixed forest) in Xiao Xing’anling Mountains. The results showed that organic N was the dominant form of TN, accounting for more than 98% of TN. Concentration of NO3--N was higher than that of NH4+-N, and SON concentration were higher than NH4+-N and NO3--N. Concentrations of NH4+-N, NO3--N, SON and MBN showed significant differences between large and small forest gaps and between forest gaps and closed forests. Especially, MBN was in the order of closed forests > small gap > medium gap > large gap, showing a significant negative correlation with gap size. NO3--N/TN and MBN/TN decreased with the increase of gap size in the three forests. NH4+-N/TN, TSN/TN and SON/TN decreased with the increase of gap size in the TiliaKorean pine mixed forest gaps and sprucefirKorean pine mixed forest gaps, but increased with the increase of gap size in the birchKorean pine mixed forest gaps. Significant correlations were observed between TSN and SON in forest gaps and closed forests. NH4+-N was significantly correlated with NO3--N and MBN in forest gaps, but such relationships were not found in the closed forests.
Key words: Potentilla fruticosa, subalpine meadow, spatial pattern, slope aspect, spatial correlation
JIANG Yi1, CHEN Li-xin1**, DUAN Wen-biao1, BU Fan1, SUN Shuang-hong1, LI Fan-fan1, XU Yi-fan2. Concentrations of different nitrogen forms in gaps of natural Pinus koraiensis mixed forest in Xiao Xing’anling Mountains.[J]. cje.
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URL: https://www.cje.net.cn/EN/abstract/abstract21756.shtml
https://www.cje.net.cn/EN/Y2014/V33/I12/3374