Earthworms are critical soil organisms, facilitating biogeochemical cycles in soil ecosystems through the formation of soil aggregates by drilling soil and accelerating microbial activity. However, the dynamic measurements of earthworm respiration have not been updated for several decades, although understanding earthworm respiration is a fundamental step in understanding the role of earthworms in soil biogeochemistry. In the present study, we applied our dynamic measurement system of soil gas exchange to earthworm respiration. Eisenia japonica and Metaphire hilgendorfi, which are typical earthworms in Japan, were used in this study. We continuously measured earthworm respiration in one or two earthworms for the first time. After confirming the possibility of continuous measurement of earthworm respiration in our system, we tested the system's performance by investigating how earthworm respiration changes in/detached from soil conditions and temperature. Responses to temperature were different between the two species, possibly because of their physiological differences. Earthworm respiration was not different among temporal treatments of in/detached from soil (only 5%-10%). Continuous time-series data of earthworm respiration obtained by the system could be subjected to mathematical time-series analyses. Wavelet analysis showed that various scales of respiration enhancements until 16 min can be observed. Taken together, the application of our system to earthworm studies will considerably enhance our understanding of earthworm sciences in future.

Soil respiration

Biogeochemistry

Biogeochemical Cycle

Bioturbation

10.2480/agrmet.d-18-00037

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Calibration of the semiconductor NH3 sensor in vitro and verification in situ

Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi (1999)

Seiichiro Yonemura Shigeto Kawashima Hideo Ohshima Masayuki Yokozawa

10.11298/taiki1995.34.4_321

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Future Agricultural Water Resources and Agricultural Production in China---Interactions between Climate Change and Soil Degradation

Journal of Agricultural Meteorology (2005)

Fulu Tao Masayuki Yokozawa

n 2 0 m m g e n e r a l l y .

Degradation

10.2480/agrmet.1169

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Risk Analysis of Cropland Suitability in China under Climate Variability and Change

Masayuki Yokozawa Fulu Tao Toshihiro Sakamoto

We explored the changing trends in agricultural water demands, the changing trends and variability in soil moisture associated with both drought and increased surface runoff in Chinese croplands during the last half-century (1946-95) as well as the projected future years (2031-65), and their impacts on agricultural production. We plotted temporal and spatial changes in soil moisture condition and its variability on a grid of 0.5o resolution. We found a trend toward agricultural water demands increasing, soil drying and significant changes in soil-moisture variability on the North China Plain and the Northeast China Plain. There was a significant decrease in agricultural water demands and a significant increase in soil-moisture levels in Southwest China, and a generally insignificant increase or decrease trend in agricultural water demands and soil-moisture levels in Southeast China. These changes in agricultural water demands and soil-moisture levels had corresponding impacts on soil-moisture deficit, and consequently on agricultural production. Increased surface runoff was found in the mountainous areas of the southwest and northeast, and in some areas along the South Coast.

10.30061/ceb.200412.0004

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Development of a global, gridded, and time-series crop yield dataset for four major cereal and legume crops

AGU Fall Meeting Abstracts (2012)

Toshichika Iizumi Masayuki Yokozawa Gen Sakurai

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