Research Article | OPEN ACCESS
The Blocking Effect is the Key Factor for the Sharp Descending of Soil Respiration Between Late Autumn and Early Winter in a Larch Forest
1Xiyang Wang, 1Zhongkui Jia, 1, 2Lvyi Ma and 1Liming Jia
1Key Laboratory for Silviculture and Conservation
2National Energy R and D Center for Non-food Biomass, Beijing Forestry University, Beijing, P.R. China
Advance Journal of Food Science and Technology 2015 7:540-547
Received: September ‎30, ‎2014 | Accepted: November ‎3, ‎2014 | Published: March 05, 2015
Abstract
o’clock with the smallest sampling errors of 0.5 to 2% was the optimal measurement point. The diurnal variation of soil respiration displayed as a single-crest curve which ascended with the increasing soil temperature in morning to a crest in early afternoon (about 13:30-15:30 o’clock), then descended. There was a significant difference in soil respiration among seasons. Hence, two separate models were used to describe the temperature sensitivity of Rs (Q10) in growing season and non-growing season better. The fitted Q10 value of Rs was 2.1 in time scale of a whole year. The obvious fluctuation of Q10 values between dormancy season (90.0) and growing season (1.6) indicated a high sensitivity of soil respiration to soil temperature in early winter. The maintenance respiration of roots in the dormant period was calculated as 0.11 μmol CO2/m2/sec. The annual mean Rs and Ra were 2.53 and 1.12 μmol CO2/m2/sec, separately. The proportion of Ra in Rs had a relative smaller range of 14 to 55% in different seasons, higher in summer and lower in winter. The soil respiration decreased sharply in the early winter, especially after the melt of the first snow. In this study, we first defined the blocking effect of a thin ice layer on soil respiration and considered the transformation of soil water from liquid to solid as the reason of soil respiration descending in early winter. This theory may raise more concerns on the physical blocking effect on soil respiration in future researches.
Keywords:
Blocking effect, Q10, soil respiration, the FTCs (the Freezing Thawing Cycles),
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The authors have no competing interests.
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