Impact of high temperature on soil water， heat and salt in purple paddy fields under different tillage patterns

doi:10.11686/cyxb2023229

Abstract

Abstract:

High-temperature events occurred more frequent in recent years than before in southwest China. The high temperature increases the soil temperature in paddy fields， and this has affected the paddy fields habitat. The aim of this study， therefore， was to explore the impact of high temperature on soil water， heat， and salt in purple paddy fields， and to compare the responses of paddy fields with different tillage patterns to high temperature. Three tillage patterns including ridge tillage （RT）， conventional paddy-upland rotation tillage （CT）， and flooded paddy field （FPF） were selected to carry out this study. The soil temperature， soil water content， and soil conductivity were monitored in 0-10 cm， 10-20 cm， 20-40 cm， and 40-60 cm soil horizons in 2021 and 2022. It was found that there was no significant difference among the three different tillage patterns in soil temperature （P>0.05） in the 0-40 cm soil horizon under the non-high-temperature conditions， but there were significant differences in soil water content and soil conductivity. Under high-temperature conditions， soil temperature and soil water content differed significantly among the four soil horizons （P<0.05） and among the three different tillage patterns in paddy fields. The tillage patterns were ranked， from highest soil temperature and soil water content to lowest， as follows： RT>FPF>CT， and from highest soil conductivity to lowest as follows： CT>FPF>RT. Under both non-high-temperature conditions and high-temperature conditions， the soil temperature and soil conductivity were significantly positively correlated under all three tillage patterns. Our results showed that high temperature affected the relationships among soil temperature， soil conductivity， and soil water content. Under high-temperature conditions， the highest soil water content and lowest soil conductivity were in the RT paddy field， indicating that ridge tillage results in better adaptability of paddy fields to high-temperature conditions.

Key words: high temperature, ridge tillage, soil temperature, soil water content, soil conductivity

Zhong-yi YIN, Li-hua MA, Zhao-lei LI, Hua FENG, Xian-jun JIANG. Impact of high temperature on soil water， heat and salt in purple paddy fields under different tillage patterns[J]. Acta Prataculturae Sinica, 2024, 33(5): 80-91.

Figures/Tables 10

Table 1 Selected soil properties under different tillage systems

处理

Treatment

有机质

Organic matter （g·kg^-1）

全氮

Total N （g·kg^-1）

碱解氮

Available N （mg·kg^-1）

全磷

Total P （g·kg^-1）

速效磷

Available P （mg·kg^-1）

全钾

Total K （g·kg^-1）

速效钾

Available K （mg·kg^-1）

容重

Density

（g?cm^-3）

孔隙度

Porosity （%）

Fig.1 Vertical cross section of the rice （paddy） ?eld under ridge tillage and conventional tillage

Fig.2 Dynamics of air temperature and precipitation during 2021-2022 test period

Fig.3 Changes in soil temperature under different air temperature with tillage treatments and soil depths

Fig.4 Changes in soil water content under different air temperature with tillage treatments and soil depths

Fig.5 Changes in soil conductivity under different air temperature with tillage treatments and soil depths

Table 2 Correlation of soil temperature， soil water content and soil conductivity under different air temperature with tillage treatments

大气温度 Air temperature	对比项目 Comparison items	相关系数Correlation coefficient
大气温度 Air temperature	对比项目 Comparison items	RT	CT	FPF
常温 Normal temperature	温度与含水率Temperature and water content	-0.905**	-0.753**	-0.561**
常温 Normal temperature	温度与电导率Temperature and conductivity	0.954**	0.919**	0.845**
高温 High temperature	温度与含水率Temperature and water content	0.249**	0.079	-0.023
高温 High temperature	温度与电导率Temperature and conductivity	0.616**	0.717**	0.499**

Fig.6 Correlation analysis of soil temperature， soil water content and soil conductivity under normal and high temperature with tillage treatments

Fig.7 Correlation analysis of air temperature and soil temperature under normal and high temperature with tillage treatments

Fig.8 Air temperature impact on soil temperature， soil water content and soil conductivity

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