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Variability of SOC mineralization by the incubation temperature, moisture and the period of time for forest ecosystems of Taiyue mountain*(PDF)

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

Issue:
2019 06
Page:
1-15
Research Field:
Articles
Publishing date:

Info

Title:
Variability of SOC mineralization by the incubation temperature, moisture and the period of time for forest ecosystems of Taiyue mountain*
Author(s):
YUAN Zhen1 ZHOU Zhiyong1** ZHAO Hongtao2SHI Jiawei1&ZHANG Huan1
1College of Forestry, Beijing Forestry University , Beijing 100083, China
2Beijing Museum of Natural History, Beijing 100050, China
Keywords:
incubation period soil moisture content soil temperature soil organic carbon mineralization temperature sensitivity
CLC:
-
PACS:
DOI:
10.19675/j.cnki.1006-687x.2019.01012
DocumentCode:

Abstract:
Temperature and moisture content are two important environmental variables controlling soil organic carbon (SOC) mineralization, but their role also changes with the incubation time increasing. Three types of forest, i.e., Pinustabulaeformis (PF), Quercuswutaishansea (QF), and the mixed forest of P. tabulaeformis and Q. wutaishansea, were selected in our study to study the SOC mineralization. The soil samples were incubated under twelve incubation conditions with three soil moisture contents (SMC) of 30%, 60%, 90% and four temperature gradients of 5 ℃, 10 ℃, 20 ℃, 30 ℃ for a time period of 387 days. The instantaneous rate of SOC mineralization was automatically monitored using a CO 2 measurement system at different temporal intervals. The study results indicated that: QF had the highest amount of the cumulative mineralized carbon at 18.58μg C·g soil-1 incubated under 20 ℃ and 90% SMC, and PF had the lowest value at 3.95μg C·g soil-1 under 30 ℃ and 30% SMC. The amount of cumulative mineralized SOC increased with the incubation temperature and moisture content increasing during the first 75 days, but during the 180th day and 387 th day, temperature decreased the amount of cumulative mineralized SOC. Similar changing trend in the instantaneous rate of SOC mineralization was also observed with incubation temperature and time changing. The SOC mineralization responded more sensitively to the variation of incubation temperature for the soil of QF. The temperature sensitivity (Q10) was highest at 2.35 for QFsoil underthe incubation conditionwith the temperature range of 5℃ and 90% SMC , and was lowest at 0.58 for MF incubated with the temperature range of20℃ and 60% SMC. In general, under the similar incubation conditions, QF had a comparatively higher value of SOC mineralization than PF and MF. During the prior incubation period, temperature and moisture interacted positively to accelerate the SOC mineralization, however, a lower amount of SOC mineralization was detected for soil samples incubated at 30 ℃ during late incubation period.

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Last Update: 2019-04-15