CSPs: soil respiration in 16 CSPs

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Dataset Abstract

The present study was performed in 16 plots spanning a forest age gradient from 20 to 120 years. We investigated the effects of the successional stage on soil respiration (Rs), autotrophic respiration (Ra) and heterotrophic respiration (Rh) in an evergreen subtropical broad-leaved forest. Rs showed significant differences among three successive stages, and it was the highest in the young stage. Ra was higher in the young stage than in the medium stage. Cumulative annual Rs and
Ra peaked in the young and old stages, respectively. Cumulative annual Rh and respiration measured from soil organic matter (RSOM) decreased, whereas RL (respiration of above ground litter) increased with forest age. The SEM revealed that cumulative annual Rs was influenced by fine root biomass and soil volumetric water content (SVWC). Our results indicated that the dominant force regulating Rs on a seasonal scale is soil temperature (ST); however, on a successional scale, belowground carbon emerges as the dominant influential factor.

Dataset Design

Rs was measured using a closed chamber connected to a portable infrared gas
144 analyzer from April 2009 to March 2012. In each plot, six shallow polyvinyl chloride (PVC) collars (20 cm interior diameter and 8 cm height) were permanently installed along a transect with 1 m intervals between collars, to depth of 3 cm, thus protruding 5 cm above the ground. Six deep collars (20 cm interior diameter and 70 cm height) were installed to a soil depth of 65 cm to exclude plant roots and organic matter input from decomposing roots (> 90% of the belowground biomass is distributed in the top 30 cm of soil) . The shallow and deep collars were used to measure Rs and Rh, respectively. The difference between Rs and Rh was used to estimate Ra. Litter was removed from half of the respiration collars to separate Rs into litter and mineral soil components, and the collars were covered with nylon mesh with a 2 mm pore size to exclude plant litterfall.
These three collars were used to measure soil respiration without litter 155 (RNL). The difference between Rs and RNL was used to estimate RL (respiration from aboveground litter), and the difference between Rh and RL was used to estimate RSOM (respiration from soil organic matter). Both Rs and Rh were measured manually twice with an interval of 1 hour every two months.
Soil temperature at a depth of 5 cm (ST) was recorded simultaneously with the Rs
162 using a soil temperature probe connected to the portable soil respiration system. From April 2009 to August 2010, the SVWC of the upper 10 cm was measured gravimetrically. In August 2010, we added two EM50 data loggers with an air temperature and humidity Sensor and an ECH2O soil temperature and moisture probe in the middle of each successional stage. The air sensor and ECH2O were used to measure air temperature and humidity at 1.50 m aboveground and ST and SVWC, respectively, at 30 min intervals.

Spatial Extent

CSP01
CSP02
CSP04
CSP05
CSP08
CSP09
CSP12
CSP13
CSP14
CSP16
CSP17
CSP18
CSP22
CSP23
CSP25
CSP26

Published

Wang C., Ma Y., Trogsich S., Huang Y, Geng Y, Scherer-Lorenzen M, He J.S (2017): Soil respiration is driven by fine root biomass along a forest chronosequence in subtropical China; Journal of Plant Ecology (in press)

Data Analysis

Ordinary linear regression was used to investigate the relationship between forest age and ST, SVWC, Rh, RSOM and RL, and the relationship between FRB and Rs, Rh and Ra. The impact of successional stage on Rs and environment parameters was examined by one-way analysis of variance (ANOVA), and a least square deviation (LSD) test was used to compare the mean differences of Rs and environment parameters among successional stages.

Paper proposal submissions

Published

2017

Data columns available in the raw data part of this dataset

Seq
Sequential number of measurement in the soil respiration measurement campaign in the CSPs
Data group: Identifier
Keywords: soil respiration
Values
1
1001
100
1000
10
CSP
Number of the comparative study plot in the CSPs
Data group: BEF research plot name
Keywords: CSP
Values
CSP02
CSP01
CSP05
CSP08
CSP04
age_class_3
Successional age class of the respective CSP. Here we use the 3 classes of successional age as defined in Wu, Y. T., Wubet, T., Trogisch, S., Both, S., Scholten, T., Bruelheide, H., & Buscot, F. (2013). Forest age and plant species composition determine the soil fungal community composition in a Chinese subtropical forest. PloS one, 8(6), e66829.
Data group: Successional age of a forest plot
Keywords: suucessional stage 3
Values
2
1
3
Plot_No
Every Plot was categorized into three different age classes (young, middle, old; see column "Age"). Within every age class, the plot age classes have been repeated 5 (old & middle) or 6 (young) times. Plot_No indicates the within-age-class replicate.
Data group: Helper
Values
3
2
1
4
5
Type
Indicates whether the measure given in this row is related to total soil respiration (d) or heterotrophic soil respiration (n)
Data group: Substrate Induced respiration
Keywords: soil respiration, soil respiration and its components
Values
d
n
Litter
Indicates wether litter was present in the probing device (y) or not (n)
Data group: Treatment
Keywords: treatment
Values
y
n
Ring
There were 8 rings in each CSP installed for soil respiration measurement. They were numbered consecutively.
Data group: Soil respiration measurement ring
Keywords: soil respiration
Values
5
4
2
3
1
Year
The measurements were carried out from April 2009 to March 2012. This column indicates the year in which the measurements were taken.
Data group: Date time information
Values
2009
2012
2010
2011
Month
Month in which the measurement was conducted.
Data group: Date time information
Values
Dec
Apr
Aug
Jan
Feb
Day
Day of the moth (see column month) in which the measurement was taken
Data group: Date time information
Values
12
11
1
10
13
Rs
Soil respiration in µMol CO2/(m²*sec). Rs was measured using a closed chamber connected to a portable infrared gas analyzer.
Unit: microMolPerSquareMeterAndSecond
Data group: Soil respiration
Keywords: soil respiration, soil respiration and its components
Values
0.12
0.15
0.14
0.16
0.17
* Huang, Y. also contributed to this column.
Ts
Soil temperature in °C. Measurements were taken in 5cm soil depth directly next to the respiration rings.
Unit: DegreesCelsius
Data group: Soil temperature
Keywords: soil temperature, temperature, environmental variable
Values
10
10.05
10.03
10.06
10.09
* Huang, Y. also contributed to this column.
SWC
Soil water content measured as the volumetric soil water content directly inside the respiration ring.
Unit: %
Data group: Soil moisture
Keywords: soil moisture
Values
0.21
0.25
0.2
0.27
0.28
* Huang, Y. also contributed to this column.