|Table of Contents|

Effects of snow cover changes on soil microbial biomass and extracellular enzyme activities of Betula platyphylla secondary forest in the Daxing’an Mountains(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2021 05
Page:
1147-1154
Research Field:
Articles
Publishing date:

Info

Title:
Effects of snow cover changes on soil microbial biomass and extracellular enzyme activities of Betula platyphylla secondary forest in the Daxing’an Mountains
Author(s):
REN Lu LI Xin MA Dalong? SONG Dandan & LIU Mengyang
College of Geographical Sciences, Harbin Normal University, Harbin 150025, China
Keywords:
Daxing’an Mountains microbial biomass extracellular enzyme natural snow stoichiometric ratio
CLC:
-
PACS:
DOI:
10.19675/j.cnki.1006-687x.2021.04065
DocumentCode:

Abstract:
The Betula platyphylla secondary forest in the Daxing’an Mountains was selected as the research object to understand the impact of reductions in snow cover on soil microbes under climate change scenarios. The artificial snow cover method was used to explore the characteristics of the variation of soil microbial biomass and extracellular enzyme activity and the key environmental factors driving these processes under natural snow cover and snow cover treatments under different periods of change. The results showed that the soil microbial biomass carbon (MBC) was highest during the snow formation period and lowest at the beginning of the vegetation growth season. In the snow-stable period, the MBC used in the artificial snow cover method was significantly higher than that used in the natural snow cover method. In the same period, the microbial biomass nitrogen (MBN) was significantly higher (P < 0.05) in natural snow cover conditions than in the snow cover condition. Snow cover had no significant effect (P > 0.05) on microbial biomass phosphorus (MBP). β-D-Glucosidase (βG) activity was significantly higher under natural snow than snow cover conditions, compared to the others, during periods when snow was stable or melting. During the stable snow cover period, the activities of β-N-acetylglucosaminidase (NAG) and peroxidase (PER) were significantly higher (P < 0.05) in natural snow cover conditions than in snow cover conditions. The overall acid phosphatase (AP) activity showed a trend of first decreasing, then increasing, and then decreasing again. Snow cover had no significant effect (P > 0.05) on the activity of polyphenol oxidase (PPO), and only changed the stoichiometric ratio of soil microbial biomass and extracellular enzymes significantly during the stable snow cover period. Redundancy analysis revealed that soil moisture content (SWC) and total phosphorus (TP) were significantly positively correlated with MBP and AP; MBC was significantly affected by soil total organic carbon (TOC); ammonium nitrogen (NH4+-N) was significantly positively correlated with MBN (P < 0.05); pH was a key environmental factor affecting NAG and βG; PER and PPO were less affected by the environment (P > 0.05). The soil microbial biomass and extracellular enzyme activity recovered quickly after being disturbed by short-term snow cover, suggesting that microorganisms can respond to global changes by regulating their own metabolic processes.

References

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Last Update: 2021-10-25