SOIL RESPIRATION AND ITS CONTROLLING FACTORS IN RICE FIELDS IN THE HILL REGION OF THE CENTRAL SICHUAN BASIN

doi:10.17521/cjpe.2006.0060

Abstract

Abstract:

Measurements of soil respiration, soil temperature and rice biomass were made during the rice growing season in the hill region of the central Sichuan Basin from April to September 2003. Characteristics of the daily and seasonal variations of soil respiration and their controlling factors are presented. The results showed that daily variations of soil respiration could be modeled with a single peak curve. The minimum and maximum soil respiration values from rice fields occurred at 7∶00 and 15∶00, respectively. Daily soil respiration rates were highly correlated with 5 cm depth soil temperature measurements. The mean rate of soil respiration was 121.76 mg·m^-2·h^-1, ranging from 18.00 to 269.69 mg·m^-2·h^-1 during the growing season. Rice root biomass and 5 cm depth soil temperatures were the major factors influencing soil CO₂ emissions during the entire growing season. There was a significant relationship between the rate of soil respiration and root biomass of rice during the initial growing season. From the middle/late stages to mature stage, 5 cm depth soil temperatures played a key role in regulating soil CO₂ emissions from rice fields, while the relationship between the rate of soil respiration and water levels in the rice fields was not obvious.

Key words: Soil respiration, Rice field, Controlling factors

HAN Guang-Xuan, ZHU Bo, JIANG Chang-Sheng. SOIL RESPIRATION AND ITS CONTROLLING FACTORS IN RICE FIELDS IN THE HILL REGION OF THE CENTRAL SICHUAN BASIN[J]. Chin J Plant Ecol, 2006, 30(3): 450-456.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2006.0060

https://www.plant-ecology.com/EN/Y2006/V30/I3/450

Figures/Tables 9

Fig.1 Daily variations of soil CO2 emission of rice at different bearing stages

Fig.2 Relationship between soil respiration from rice field and 5 cm soil temperature

Table 1 Correlation relationship between soil respiration and different temperatures

日期 Date	5 cm土壤温度 5 cm soil temperature	地表温度 Surface ground temperature	箱内温度 Air temperature in chamber	气温 Air temperature
5月28日 May 28	0.887^**	0.881^**	0.953^**	0.930^**
7月22日 July 22	0.913^**	0.672	0.752	0.743
9月5日 September 5	0.914^**	0.395	0.678	0.522

Fig.3 Seasonal variations of soil respiration, 5 cm soil temperature and root biomass of rice

Fig.4 Relationship between root biomass of rice and days after transplanting

Fig.5 Relationship between root biomass and soil respiration from rice field (from transplanting to 35 days after transplanting)

Fig.6 Relationship between soil respiration from rice field and 5cm soil temperature during the growing season

Fig.7 Relationship between 5 cm soil temperature and soil respiration from rice field (from 42 days after transplanting to reaping)

Fig.8 Relationship between soil respiration and depth of water on the ground

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