Effects Of The Root Resection On Spatio-temporal Patterns Of Soil Microbial Biomass In Six Forest Types In Xiaoxing’an Mountains

Our objective is to address the question by comparing the effect of these roots resection treatments on underground soil microbial and soil nutrient stability. We used a chloroform fumigation extraction method to measure and to compare the soil microbial biomass carbon (MBC) and nitrogen (MBN) on the seasonal variation, and to assess the influence of environmental factors in six forest types of mixed broadleaved-Korean pine (Pinus koraiensis) forest, valley spruce-fir (Picea-Abies) forest, selective cutting of mixed broadleaved-Korean pine forest, secondary birch (Betula platyphylla) forest, artificial larch (Larix gmelinii) plantation and artificial Korean pine forest ecosystem in Xiaoxing’an Mountains. We explored the effect of root removed on soil microbial biomass. The results were listed as following:1) Comparing with the control plot, we observed that the significant difference in soil microbial biomass and soil nutrient stability between the root-removed and the control plots:the MBC of the root-removed plots were significant difference with control plots, but the root-removed plots exist no significant difference in MBN of the same forests (P>0.05). We observed that the significant difference in soil microbial biomass and soil nutrient stability between the root-removed and the control plots. With the lack of the protection of root and soil, the soil microbial biomass carbon of this area would be probably reduced and the carbon sequestration of the forest soil would be influenced during the freeze-thaw cycles.2) During the freeze thaw season and growing season in the MBC and MBN were greater at the 0-10 cm soil layer than those at 10-20 cm. The seasonal variations of soil microbial biomass in 2010 were greater than that in 2013 during the growing season. Root removal had no effect on soil microbial biomass pattern of seasonal variation, but there were difference degrees of reduction of soil microbial biomass for six forests.3) The MBC and MBN were positively correlated with TOC, TN and WC%. In 2010, the MBC and TOC, TN significant positive correlation (P<0.01); the WC% significant positive correlation (P <0.05), MBN and TOC, TN were significant positive correlation (P<0.01) in 2013.