Effects of Tobacco-Rice Continuous Cropping on Distribution and Stability of Soil Aggregates in Red Paddy Soil

doi:10.11924/j.issn.1000-6850.casb2021-0881

Abstract

Abstract:

Red paddy soil is facing quality problems such as soil structure degradation, soil nutrient imbalance and acidification, which have impeded the growth of agricultural production and farmers’ income. In this paper, we sampled tobacco planting soil from the red soil hilly region in southern China, to explore the effects of tobacco-rice continuous cropping (YDLZ) on soil aggregates’ distribution, aggregates’ stability as well as the key influencing factors, based on the means of spatial-temporal substitution, correlation analysis and redundancy analysis. The results showed that the content of >5 mm soil aggregates, and the mean weight diameter (MWD) and geometric mean diameter (GMD) of soil aggregates decreased after YDLZ in red paddy soil, but the content of <0.25 mm soil aggregates and the aggregate fractal dimension (D) increased significantly; therefore, the stability of soil aggregates decreased. Meanwhile, the greatest influence was found on the distribution and stability of soil aggregates under the YDLZ years from 5 to 10 (YDLZ_5-10). Correlation and redundancy analysis (RDA) revealed that the contents of soil organic matter and clay were the key indexes that induced the variation of the soil aggregates distribution; and the content of >5 mm and <0.25 mm soil aggregates were the key indexes that caused the variation of the soil aggregates’ stability. The change of organic matter and clay content in red paddy soil caused by continuous cropping of tobacco and rice mainly resulted in the decrease of >5 mm aggregates’ content and the increase of <0.25 mm aggregates’ content, which could reduce soil aggregate stability. Therefore, for the cultivation of soil structure and soil quality in red paddy soil of YDLZ, it is necessary to pay attention to the content variation of soil organic matter and clay.

Key words: red paddy soil, continuous cropping, soil aggregates, redundancy analysis (RDA)

CLC Number:

S157.1

LU Feng, LIAO Chaolin, XIAO Zhipeng, SHI Gang, XIANG Penghua, YU Baocheng, SHAN Xuehua, XIA Fan. Effects of Tobacco-Rice Continuous Cropping on Distribution and Stability of Soil Aggregates in Red Paddy Soil[J]. Chinese Agricultural Science Bulletin, 2022, 38(26): 56-61.

Figures/Tables 7

References 23

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年限/年	>5 mm	5~3 mm	3~2 mm	2~1 mm	1~0.5 mm	0.5~0.25 mm	<0.25 mm
0	67.63±1.10a	12.31±0.99b	4.85±0.38a	2.41±0.67b	2.13±1.54a	1.90±0.59b	8.76±2.81d
0~5	52.08±3.40cd	16.13±1.17a	5.64±0.83a	3.56±0.57ab	3.65±0.32a	4.13±0.68ab	14.80±4.09bc
5~10	48.40±4.95d	13.27±1.19b	5.02±0.51a	2.57±1.35ab	3.38±1.68a	4.08±1.91ab	23.28±6.85a
10~15	54.25±3.63bc	12.97±0.39b	5.21±0.15a	2.43±0.49b	3.26±0.66a	4.68±0.89a	17.20±1.68ab
15~20	58.54±0.89b	12.86±1.01b	5.25±0.69a	3.99±0.91a	4.04±0.78a	2.68±1.44ab	12.65±1.56c
>20	57.94±1.79b	12.29±1.31b	4.96±0.39a	2.51±0.37ab	2.88±0.85a	3.26±0.87ab	16.17±2.88b

年限/年	>5 mm	5~3 mm	3~2 mm	2~1 mm	1~0.5 mm	0.5~0.25 mm	<0.25 mm
0	67.63±1.10a	12.31±0.99b	4.85±0.38a	2.41±0.67b	2.13±1.54a	1.90±0.59b	8.76±2.81d
0~5	52.08±3.40cd	16.13±1.17a	5.64±0.83a	3.56±0.57ab	3.65±0.32a	4.13±0.68ab	14.80±4.09bc
5~10	48.40±4.95d	13.27±1.19b	5.02±0.51a	2.57±1.35ab	3.38±1.68a	4.08±1.91ab	23.28±6.85a
10~15	54.25±3.63bc	12.97±0.39b	5.21±0.15a	2.43±0.49b	3.26±0.66a	4.68±0.89a	17.20±1.68ab
15~20	58.54±0.89b	12.86±1.01b	5.25±0.69a	3.99±0.91a	4.04±0.78a	2.68±1.44ab	12.65±1.56c
>20	57.94±1.79b	12.29±1.31b	4.96±0.39a	2.51±0.37ab	2.88±0.85a	3.26±0.87ab	16.17±2.88b

年限/年	2~1 mm		1~0.5 mm		0.5~0.25 mm		0.25~0.05 mm		0.05~0.02 mm		0.02~0.002 mm		<0.002 mm
0	2.35±0.44ab		3.29±0.41a		3.12±0.16b		15.90±1.53a		15.46±3.17a		32.54±1.74c		27.32±1.12a
0~5	2.65±0.41ab		2.68±0.19b		3.02±0.23b		15.80±0.27a		17.15±1.31a		33.88±2.53bc		24.81±0.95ab
5~10		2.29±0.38b		2.67±0.41b		2.84±0.51b		16.50±1.05a		16.56±1.69a		36.21±1.10ab		22.93±2.02b
10~15		2.87±0.15ab		2.69±0.14b		2.88±0.24b		13.23±1.20b		16.92±1.14a		36.71±1.13ab		24.72±1.96ab
15~20		2.94±0.12a		3.61±0.10a		3.70±0.31a		12.22±0.34b		16.71±1.82a		34.33±1.50bc		26.48±1.07a
>20		2.73±0.09ab		2.12±0.21c		2.17±0.17c		11.66±2.00b		16.95±0.65a		38.23±1.63a		26.14±0.47a

年限/年	2~1 mm		1~0.5 mm		0.5~0.25 mm		0.25~0.05 mm		0.05~0.02 mm		0.02~0.002 mm		<0.002 mm
0	2.35±0.44ab		3.29±0.41a		3.12±0.16b		15.90±1.53a		15.46±3.17a		32.54±1.74c		27.32±1.12a
0~5	2.65±0.41ab		2.68±0.19b		3.02±0.23b		15.80±0.27a		17.15±1.31a		33.88±2.53bc		24.81±0.95ab
5~10		2.29±0.38b		2.67±0.41b		2.84±0.51b		16.50±1.05a		16.56±1.69a		36.21±1.10ab		22.93±2.02b
10~15		2.87±0.15ab		2.69±0.14b		2.88±0.24b		13.23±1.20b		16.92±1.14a		36.71±1.13ab		24.72±1.96ab
15~20		2.94±0.12a		3.61±0.10a		3.70±0.31a		12.22±0.34b		16.71±1.82a		34.33±1.50bc		26.48±1.07a
>20		2.73±0.09ab		2.12±0.21c		2.17±0.17c		11.66±2.00b		16.95±0.65a		38.23±1.63a		26.14±0.47a

年限/年	pH	有机质/(g/kg)	全氮/(g/kg)	全磷/(g/kg)	全钾/(g/kg)
0	6.28±0.12a	51.40±1.38a	2.99±0.17a	0.88±0.12c	12.70±0.34d
0~5	6.19±0.11ab	45.89±0.58bc	2.55±0.05bc	0.82±0.05c	11.80±0.91d
5~10	5.26±0.15c	42.08±1.46d	2.27±0.07c	1.01±0.16b	17.38±0.32c
10~15	6.12±0.29b	47.41±1.20b	2.80±0.09b	1.10±0.12b	21.53±1.18b
15~20	4.97±0.12d	45.41±0.62c	2.41±0.07bc	1.31±0.15a	19.91±0.58b
>20	6.06±0.14bc	44.54±0.50c	2.49±0.01b	1.11±0.04b	25.35±1.22a