Jia Shu-xi, Zhao Yan-li, Sun Yue, Chen Li, Wang Zheng-quan
School of Forestry, Northeast Forestry University, Harbin 150040, China.
Ying Yong Sheng Tai Xue Bao. 2009 Sep;20(9):2063-71.
This paper studied the seasonal dynamics of soil microbial biomass C (Cmic) and N (Nmic), and of bacteria (cfu(b)), fungi (cfu(f)), and actinomyces (cfu(a)) in Larix gmelinii and Fraxinus mandshurica plantations in 2007-2008 under N fertilization. The two-year averaged soil Cmic and Nmic in L. gmelinii plantation were 13.8% and 18.3% lower than those in F. mandshurica plantation, respectively, but the soil Cmic and Nmic in the two plantations had similar seasonal patterns, being the lowest in May and the highest in September. The Cmic and Nmic, and the cfu(b), cfu(r), and cfu(a), were all greater in topsoil (0-10 cm) than in subsoil (10-20 cm), but the seasonal patterns of cfu(b), cfu(f), and cfu(a), were different from those of Cmic and Nmic. N fertilization decreased the Cmic and Nmic, and the cfu(b), cfu(f), and cfu(a), significantly, with the decrements of Cmic and Nmic being 24% and 63% in L. gmelinii plantation, and 51% and 68% in F. mandshurica, respectively, which suggested that N fertilization limited soil microbial biomass and altered soil microbial communities in the two plantations.
本文研究了2007 - 2008年施氮条件下兴安落叶松和水曲柳人工林中土壤微生物生物量碳（Cmic）、氮（Nmic）以及细菌（cfu(b)）、真菌（cfu(f)）和放线菌（cfu(a)）的季节动态。兴安落叶松人工林两年平均土壤Cmic和Nmic分别比水曲柳人工林低13.8%和18.3%，但两种人工林土壤Cmic和Nmic具有相似的季节模式，均在5月最低，9月最高。Cmic和Nmic以及cfu(b)、cfu(r)和cfu(a)在表层土壤（0 - 10厘米）中均高于下层土壤（10 - 20厘米），但cfu(b)、cfu(f)和cfu(a)的季节模式与Cmic和Nmic不同。施氮显著降低了Cmic和Nmic以及cfu(b)、cfu(f)和cfu(a)，兴安落叶松人工林中Cmic和Nmic的降幅分别为24%和63%，水曲柳人工林中分别为51%和68%，这表明施氮限制了两种人工林土壤微生物生物量并改变了土壤微生物群落。
