Chambers


Automated Chamber Systems & Monitoring Sites

Liangber Portable Soil Flux System

The portable automated chamber system is designed by applying a flow-through, non-steady-state technique. In brief, the system comprises a control unit that is a waterproof plastic case (Pelican 1550), and two cylinder-designed chambers. The control unit’s main components were a Campbell datalogger (CR1000), a micro infrared CO2 analyzer (LI-8xx or LAC_CO2), two valve-manifold, and a home-made relay board. The chambers (30 cm in diameter by 30 cm in height) were constructed of 3 mm thick aluminum cylinder. The chamber lids are raised and closed by two pneumatic cylinders that operated at a pressure of about 0.2 MPa, which is generated by a micro-compressor. The two chambers are closed sequentially and the sampling period for each chamber is 180 s (Sure, you can set it according to your research objectivity). Between measurements, the chamber lid is raised to keep the soil conditions as natural as possible. During the measurements, the chamber lid is closed and the chamber air is mixed by a micro water-proof fan. The length of sapling tube between the chamber and control unit is 3 m, and the chamber air is circulated through the IRGA by a 1.5 L min–1 diaphragm pumpi. Air temperature and atmosphere pressure inside the chambers are monitored by a high precision thermistor sensor and a high precision pressure transducer, respectively. Simultaneously, soil temperature and soil moisture at 5 cm depth near the measured chamber are monitored by a thermocouple probe and a TDR sensor, respectively. The change in the CO2 concentration and all of the parameters are recorded by the datalogger at 5 s intervals.

  For details, please refer the following publications:

  1. Takada M., Yamada T., Liang N., Ibrahim S., Okuda T. 2015. Soil respiration change immediately after logging operations in an upper tropical hill forest, peninsular Malaysia. Hikobia 17: 3-9
  2. Sun L., Teramoto M. Liang N. Yazaki T., Hirano T. 2017. Comparison of litter-bag and chamber methods for litter decomposition. J. Agricultural Meteorology 73(2): 59-67; DOI: 10.2480/agrmet.D-16-00012
  3. Gao J., Zhang Y., Song Q., Lin Y., Zhou R., Dong Y., Zhou L., Li J., Jin Y., Zhou W., Liu Y., Sha L., Grace J., Liang N. 2019. Stand age‐related effects on soil respiration in rubber plantations (Hevea brasiliensis) in southwest China. European Journal of Soil Science 2019; 1-13  https://doi.org/10.1111/ejss.12854
  4. Sun L., Hirano T., Yazakia T., Teramoto M., Liang N. 2020. Fine root dynamics and partitioning of root respiration into growth and maintenance components in cool temperate deciduous and evergreen forests. Plant and Soil (2020) 446:471–486, http://doi.org/10.1007/s11104-019-04343-z
  5. Zhao X., Liang N., Zeng J., Mohti A. 2020. A simple model for partitioning forest soil respiration based on root allometry. Soil Biology and Biochemistry 152 (2021) 108067, https://doi.org/10.1016/j.soilbio.2020.108067

富士サイト

NIES

Xiaping of Taiwan

Rain experiment

Pasoh

Tropical Rainforest in Peninsola Malaysia

土壌は生態系の根幹であり、陸域生態系における気候変動適応策を確立するうえで、最優先に考慮すべきものである。我々は20年間に亘って、チャンバーネットワークを用いてアジア域の陸域生態系を網羅する土壌呼吸をモニタリングするとともに、多地点の森林において温暖化操作実験を推進してきた。そこから、土壌有機炭素動態に対する温暖化や台風等のハザードの影響、土地利用変化の影響に関する定量的検出及びそのメカニズム解明を行ってきた。本発表ではそれらの観測データに基づき、適応策に関するアプローチとして、国内の老齢化した二次林における研究及びアジアの熱帯林における研究を紹介する。