Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (9): 2181-2191.DOI: 10.3969/j.issn.1004-1524.20221470
• Environmental Science • Previous Articles Next Articles
A soil respiration monitoring equipment based on open chamber method
GU Kechen(
), JIANG Junjie, PAN Chenxin, SUN Qisong, YIN Wenjie, HU Junguo()
- College of Mathematics and Computer Science, Zhejiang A&F University, Hangzhou 311300, China
-
Received:2022-10-24Online:2023-09-25Published:2023-10-09
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Cite this article
GU Kechen, JIANG Junjie, PAN Chenxin, SUN Qisong, YIN Wenjie, HU Junguo. A soil respiration monitoring equipment based on open chamber method[J]. Acta Agriculturae Zhejiangensis, 2023, 35(9): 2181-2191.
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Fig.1 Soil respiration monitoring equipment in this research
Fig.1 Soil respiration monitoring equipment in this research
Fig.2 Diagram of a typical open chamber system setup
Fig.2 Diagram of a typical open chamber system setup
Fig.3 Photos of soil respiration monitoring equipment a, Outside view of the chamber; b, Inside view of the chamber.
Fig.3 Photos of soil respiration monitoring equipment a, Outside view of the chamber; b, Inside view of the chamber.
Fig.4 Three-dimensional model of chamber
Fig.4 Three-dimensional model of chamber
Fig.5 Diagram of chamber mesh
Fig.5 Diagram of chamber mesh
Table 1 Porosities and permeabilities of three porous media
| 介质 Medium | 孔隙率 Porosity/ (m3·m-3) | 渗透率 Permeability/ m2 |
|---|---|---|
| 多孔介质1 Porous medium 1 | 0.3 | 2×10-11 |
| 多孔介质2 Porous medium 2 | 0.4 | 2×10-10 |
| 多孔介质3 Porous medium 3 | 0.5 | 2×10-9 |
Table 1 Porosities and permeabilities of three porous media
| 介质 Medium | 孔隙率 Porosity/ (m3·m-3) | 渗透率 Permeability/ m2 |
|---|---|---|
| 多孔介质1 Porous medium 1 | 0.3 | 2×10-11 |
| 多孔介质2 Porous medium 2 | 0.4 | 2×10-10 |
| 多孔介质3 Porous medium 3 | 0.5 | 2×10-9 |
Fig.6 CO2 volume fraction contours within chamber at different soil respiration rates The soil respiration rates in a-d are 0.5, 2, 5, 10 μmol·m-2·s-1, respectively.
Fig.6 CO2 volume fraction contours within chamber at different soil respiration rates The soil respiration rates in a-d are 0.5, 2, 5, 10 μmol·m-2·s-1, respectively.
Fig.7 Relationship between k value and cluster intertia
Fig.7 Relationship between k value and cluster intertia
Fig.8 Clustering results
Fig.8 Clustering results
Table 2 Centroid coordinates and number of samples of each cluster
| 簇编号 Cluster No. | 质心坐标 Centroid coordinate/m | 样本点数量 Sample quantity |
|---|---|---|
| 1 | (-0.008 3, 0.112 0, 0.200 0) | 711 |
| 2 | (-0.101 0, 0.101 0, 0.206 0) | 881 |
| 3 | (-0.105 0, 0.033 5, 0.206 0) | 717 |
| 4 | (-0.047 3, 0.081 3, 0.117 0) | 447 |
| 5 | (-0.046 5, 0.071 7, 0.209 0) | 1 335 |
Table 2 Centroid coordinates and number of samples of each cluster
| 簇编号 Cluster No. | 质心坐标 Centroid coordinate/m | 样本点数量 Sample quantity |
|---|---|---|
| 1 | (-0.008 3, 0.112 0, 0.200 0) | 711 |
| 2 | (-0.101 0, 0.101 0, 0.206 0) | 881 |
| 3 | (-0.105 0, 0.033 5, 0.206 0) | 717 |
| 4 | (-0.047 3, 0.081 3, 0.117 0) | 447 |
| 5 | (-0.046 5, 0.071 7, 0.209 0) | 1 335 |
Table 3 Measurement of soil respiration rate
| 指标Index | 2022-03-15 | 2022-04-19 | 2022-04-20 | 2022-04-21 | 2022-07-07 | 2022-07-09 |
|---|---|---|---|---|---|---|
| 样本数Sample size | 8 | 6 | 3 | 6 | 5 | 3 |
| LI-8100测量值 | 1.76±0.06 | — | — | — | 5.90±0.32 | 5.75±0.98 |
| Measured value by LI-8100/ (μmol·m-2·s-1) | ||||||
| SMCC测量值 | — | 3.68±0.998 | 2.40±0.0532 | 3.35±0.928 | — | — |
| Measured value by SMCC/ (μmol·m-2·s-1) | ||||||
| SRME测量值 | 1.57±0.18 | 3.77±1.19 | 2.71±0.26 | 3.31±0.98 | 5.45±0.71 | 6.30±1.24 |
| Measured value by SRME/ (μmol·m-2·s-1) | ||||||
| 平均误差Mean error/% | 12.8 | 7.9 | 12.7 | 8.1 | 11.4 | 12.1 |
Table 3 Measurement of soil respiration rate
| 指标Index | 2022-03-15 | 2022-04-19 | 2022-04-20 | 2022-04-21 | 2022-07-07 | 2022-07-09 |
|---|---|---|---|---|---|---|
| 样本数Sample size | 8 | 6 | 3 | 6 | 5 | 3 |
| LI-8100测量值 | 1.76±0.06 | — | — | — | 5.90±0.32 | 5.75±0.98 |
| Measured value by LI-8100/ (μmol·m-2·s-1) | ||||||
| SMCC测量值 | — | 3.68±0.998 | 2.40±0.0532 | 3.35±0.928 | — | — |
| Measured value by SMCC/ (μmol·m-2·s-1) | ||||||
| SRME测量值 | 1.57±0.18 | 3.77±1.19 | 2.71±0.26 | 3.31±0.98 | 5.45±0.71 | 6.30±1.24 |
| Measured value by SRME/ (μmol·m-2·s-1) | ||||||
| 平均误差Mean error/% | 12.8 | 7.9 | 12.7 | 8.1 | 11.4 | 12.1 |
Fig.9 Time series of measured soil CO2 flux (March 15, 2022) SRME, Soil respiration monitoring equipment. The same as below.
Fig.9 Time series of measured soil CO2 flux (March 15, 2022) SRME, Soil respiration monitoring equipment. The same as below.
Fig.10 Comparison of measured soil respiration rates
Fig.10 Comparison of measured soil respiration rates
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