COMPARISONS BETWEEN SEASONAL AND DIURNAL PATTERNS OF SOIL RESPIRATION IN A MONTANE EVERGREEN BROAD-LEAVED FOREST OF AILAO MOUNTAINS, CHINA

doi:10.3773/j.issn.1005-264x.2008.01.004

Abstract

Abstract:

Aims Soil respiration may have distinct dynamic patterns at different temporal scales since it is affected by diverse abiotic and biotic factors. Seasonal variation in soil respiration is largely controlled by abiotic factors such as temperature and soil moisture, whereas the regulation of diurnal variation is likely physiological rhythms of plants. Our objectives were to compare seasonal and diurnal patterns of soil respiration and to evaluate relationships between soil respiration and temperature at annual and diurnal scales.
Methods We examined seasonal variations of soil respiration using infrared gas analyzers at monthly or bimonthly intervals from April 2004 to March 2005, and diurnal variations in July, September and November 2004 as well as in January, March and May 2005 in a montane evergreen broad-leaved forest in Ailao Mountains, China. Soil temperature, air temperature, soil water content and air humidity were measured at the same time. We evaluated Q₁₀ values of soil respiration and correlations between soil respiration and soil temperature.
Important findings Soil respiration fluctuated with distinct seasonal and diurnal patterns. Soil respiration was higher in the wet season (May through October) than in the dry season (November through April). Diurnal patterns of soil respiration varied among seasons. The mean rate of soil respiration was higher in nighttime than in daytime in July, September, January and March, but lower in November and May. On the whole-year basis, soil respiration correlated strongly with soil temperature and soil water content. However, on a diurnal scale, these regressions were not significant. Q₁₀ values were 4.48, 7.17 and 2.34 for the whole year, dry season and wet season, and their corresponding soil temperature ranges were 5.9-16.6, 5.9-11.0 and 10.3-16.6 ℃, respectively. Our results demonstrate that biotic and abiotic factors have distinct impacts on soil respiration at different temporal scales in the forest. Estimation on daily and annual carbon fluxes based on instantaneous measurements of soil respiration, rather than 24-hour measurements, may cause severe deviation from actual values because of the lack of diurnal correlation between soil respiration and temperature.

Key words: diurnal variation, Q₁₀ value, soil moisture, soil respiration, soil temperature

FENG Wen-Ting, ZOU Xiao-Ming, SHA Li-Qing, CHEN Jian-Hui, FENG Zhi-Li, LI Jian-Zhou. COMPARISONS BETWEEN SEASONAL AND DIURNAL PATTERNS OF SOIL RESPIRATION IN A MONTANE EVERGREEN BROAD-LEAVED FOREST OF AILAO MOUNTAINS, CHINA[J]. Chin J Plant Ecol, 2008, 32(1): 31-39.

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Figures/Tables 5

Fig.1 Seasonal variation of soil respiration Each datum represents Mean±SE

Fig.2 Seasonal variation of soil temperature, air temperature and soil water content Note see Fig. 1

Fig.3 Diurnal variation of soil respiration, soil temperature and air temperature A, B, C, D, E, F represent data observed in Jul. 2004, Sept. 2004, Nov. 2004, Jan. 2005, Mar. 2005 and May 2005, respectively

Fig.4 Relationship between seasonal soil respiration and soil temperature (A) and air temperature (B)

Table 1 Regression between diurnal variation of soil respiration and soil temperature, air temperature and soil water content

年-月 Year-month	土壤呼吸(y)-土壤温度(T_s)	土壤呼吸(y)-空气温度(T_a)	土壤呼吸(y)-土壤含水量(W)
2004-7	Y=12.049 $e - 0.22 T s$ R²=0.091 NS	Y=1.003 9 $e - 0.0478 T a$ R²=0.183 NS	Y=0.007 9W+0.202 R²=0.092 NS	Y=0.284 7e^{0.014 8}^W R²=0.084 NS
2004-9	Y=8E-05 $e 0.6243 T s$ R²=0.175 NS	Y=0.254 9 $e 0.0528 T a$ R²=0.191 NS	Y=0.000 4W+0.483 2 R²=0.002 NS	Y=0.461e^{0.001 5}^W R²=0.010 NS
2004-11	Y=0.738 3 $e - 0.1634 T s$ R²=0.038 NS	Y=0.291 1 $e - 0.0495 T a$ R²=0.046 NS	Y=-0.004W+ 0.374 5 R²=0.017 NS	Y=0.35e^-0.012^W R²=0.015 NS
2005-1	Y=0.124 5 $e 0.0651 T s$ R²=0.091 NS	Y=0.199 4 $e - 0.0067 T a$ R²=0.128 NS	Y=0.000 9W+0.167 3 R²=0.059 NS	Y=0.169 3e^{0.004 7}^W R²=0.051 NS
2005-3	Y=0.486 $e - 0.0598 T s$ R²=0.016 NS	Y=0.294 6 $e - 0.0081 T a$ R²=0.109 NS	Y=-0.000 2W+0.281 3 R²=0.001 NS	Y=0.282e^{-0.000 9}^W R²=0.001 NS
2005-5	Y=0.095 6 $e 0.0718 T s$ R²=0.448^*	Y=0.245 $e 0.0073 T a$ R²=0.409^*	Y=-0.001 9W+0.299 6 R²=0.067 NS	Y=0.300 5e^{-0.006 8}^W R²=0.072 NS

Table 1 Regression between diurnal variation of soil respiration and soil temperature, air temperature and soil water content

年-月 Year-month	土壤呼吸(y)-土壤温度(T_s)	土壤呼吸(y)-空气温度(T_a)	土壤呼吸(y)-土壤含水量(W)
2004-7	Y=12.049 $e - 0.22 T s$ R²=0.091 NS	Y=1.003 9 $e - 0.0478 T a$ R²=0.183 NS	Y=0.007 9W+0.202 R²=0.092 NS	Y=0.284 7e^{0.014 8}^W R²=0.084 NS
2004-9	Y=8E-05 $e 0.6243 T s$ R²=0.175 NS	Y=0.254 9 $e 0.0528 T a$ R²=0.191 NS	Y=0.000 4W+0.483 2 R²=0.002 NS	Y=0.461e^{0.001 5}^W R²=0.010 NS
2004-11	Y=0.738 3 $e - 0.1634 T s$ R²=0.038 NS	Y=0.291 1 $e - 0.0495 T a$ R²=0.046 NS	Y=-0.004W+ 0.374 5 R²=0.017 NS	Y=0.35e^-0.012^W R²=0.015 NS
2005-1	Y=0.124 5 $e 0.0651 T s$ R²=0.091 NS	Y=0.199 4 $e - 0.0067 T a$ R²=0.128 NS	Y=0.000 9W+0.167 3 R²=0.059 NS	Y=0.169 3e^{0.004 7}^W R²=0.051 NS
2005-3	Y=0.486 $e - 0.0598 T s$ R²=0.016 NS	Y=0.294 6 $e - 0.0081 T a$ R²=0.109 NS	Y=-0.000 2W+0.281 3 R²=0.001 NS	Y=0.282e^{-0.000 9}^W R²=0.001 NS
2005-5	Y=0.095 6 $e 0.0718 T s$ R²=0.448^*	Y=0.245 $e 0.0073 T a$ R²=0.409^*	Y=-0.001 9W+0.299 6 R²=0.067 NS	Y=0.300 5e^{-0.006 8}^W R²=0.072 NS

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