Effect of Freeze-thaw Cycles on Distribution of Soil Aggregates and Their Organic Carbon Content in Arable Mollisol

doi:10.11924/j.issn.1000-6850.casb2024-0080

Abstract

Abstract:

To investigate the impact of freeze-thaw cycles on soil aggregates and bound carbon in arable mollisol, this study took arable mollisol in Hailun, Heilongjiang Province as the research object. Incubation experiments were conducted to investigate the impact of freeze-thaw frequency on soil aggregates and organic carbon content of arable mollisol at three temperatures: -9, -18 and -26℃. The results indicated that the content of 1-0.5 mm and 0.25-0.053 mm aggregates exhibited significant changes at all three freeze-thaw temperatures with an increase of freeze-thaw frequencies (P<0.05). Compared with single freeze-thaw cycle, after 17 freeze-thaw cycles at the same temperature, the content of 1-0.5 mm aggregates decreased by 68.53%, 10.91% and 40.96% at -9, -18 and -26℃, respectively. The content of 0.25-0.053 mm aggregates increased by 10.93%, 40.89% and 99.72%, respectively. At -9℃, the fractal dimension of soil aggregates significantly increased (P<0.05) from 2.09 to 2.74, while at -18℃ and -26℃, the changes were small, with changes of 0.1 and 0.05, respectively. The bound carbon of soil aggregates did not show significant changes with the increase of freeze-thaw frequency (P>0.05). At -18℃ and -26℃, the <0.053 mm aggregate showed a gradual decreasing trend, with a decrease of 10.31% and 13.73% after 17 freeze-thaw cycles, respectively. The freeze-thaw impact could significantly reduce the stability of soil aggregates in arable mollisol. The increasing freeze-thaw cycles can significantly reduce the content of aggregates by 1-0.5 mm and increase the content of aggregates by 0.25-0.053 mm(P<0.05). Both freeze-thaw frequency and temperature were important factors affecting the stability of soil aggregates.

Key words: freeze-thaw cycles, soil aggregates, aggregates stability, aggregates bound organic carbon, freeze-thaw action, organic carbon, soil physicochemical properties, soil management, ecosystem restoration

ZHU Shuai, LI Shiyong, JIANG Boyu, ZHAO Wenyi, ZHAO Maojie, CHEN Yimin, SUI Yueyu, JIAO Xiaoguang. Effect of Freeze-thaw Cycles on Distribution of Soil Aggregates and Their Organic Carbon Content in Arable Mollisol[J]. Chinese Agricultural Science Bulletin, 2024, 40(23): 53-59.

Figures/Tables 5

References 38

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冻融温度/ ℃	冻融循环次数/次	团聚体含量
冻融温度/ ℃	冻融循环次数/次	>2 mm	2~1 mm	1~0.5 mm	0.5~0.25 mm	0.25~0.053 mm	<0.053 mm
-9	1	0.89±0.01b	11.14±1.36a	28.57±1.12a	19.12±1.39a	22.05±0.61bc	18.24±0.48b
	3	0.92±0.03b	3.68±0.03b	7.33±0.47b	18.20±1.36b	27.14±1.92a	42.72±1.02c
	5	0.60±0.17bc	6.31±2.05b	9.86±2.23b	15.11±1.48bc	20.64±0.59c	47.47±2.42a
	9	0.42±0.03c	4.96±0.14b	8.38±1.87b	13.75±2.31c	22.95±0.86bc	49.55±3.13a
	17	1.75±0.30a	4.74±0.37b	8.99±1.12b	11.91±0.81c	24.46±0.88ab	48.14±0.11a
-18	1	2.63±0.26b	4.04±0.23d	19.8±0.46b	11.31±1.17b	13.50±1.12b	48.71±1.43a
	3	4.64±0.91a	8.72±0.57a	17.10±0.20ab	23.29±5.56a	11.23±1.34b	35.02±2.94cd
	5	1.20±0.27c	5.46±0.19c	14.20±3.40b	20.95±2.09a	19.39±2.14a	38.80±0.71b
	9	4.05±0.33b	6.43±0.47b	18.48±0.11ab	21.67±1.23a	15.35±1.03ab	34.02±1.10d
	17	0.60±0.06c	5.50±0.54c	17.64±0.20ab	19.53±3.24a	19.02±3.54a	37.71±0.69bc
-26	1	0.59±0.16c	4.52±0.82b	22.61±0.07a	21.59±1.29a	14.53±0.52c	36.15±0.01a
	3	2.90±0.34b	5.74±0.59a	12.01±1.91d	25.11±0.27a	20.12±0.17b	34.13±1.74a
	5	1.78±1.24bc	3.36±0.03c	16.86±1.18b	24.36±2.70a	21.49±2.26b	32.15±1.85bc
	9	9.67±0.47a	4.65±0.19b	14.73±0.89bc	23.55±3.09a	18.57±0.59b	28.81±2.90c
	17	1.35±0.24bc	2.85±0.04c	13.35±0.30cd	25.65±4.06a	29.02±2.83a	27.79±1.20c

冻融温度/ ℃	冻融循环次数/次	团聚体含量
冻融温度/ ℃	冻融循环次数/次	>2 mm	2~1 mm	1~0.5 mm	0.5~0.25 mm	0.25~0.053 mm	<0.053 mm
-9	1	0.89±0.01b	11.14±1.36a	28.57±1.12a	19.12±1.39a	22.05±0.61bc	18.24±0.48b
	3	0.92±0.03b	3.68±0.03b	7.33±0.47b	18.20±1.36b	27.14±1.92a	42.72±1.02c
	5	0.60±0.17bc	6.31±2.05b	9.86±2.23b	15.11±1.48bc	20.64±0.59c	47.47±2.42a
	9	0.42±0.03c	4.96±0.14b	8.38±1.87b	13.75±2.31c	22.95±0.86bc	49.55±3.13a
	17	1.75±0.30a	4.74±0.37b	8.99±1.12b	11.91±0.81c	24.46±0.88ab	48.14±0.11a
-18	1	2.63±0.26b	4.04±0.23d	19.8±0.46b	11.31±1.17b	13.50±1.12b	48.71±1.43a
	3	4.64±0.91a	8.72±0.57a	17.10±0.20ab	23.29±5.56a	11.23±1.34b	35.02±2.94cd
	5	1.20±0.27c	5.46±0.19c	14.20±3.40b	20.95±2.09a	19.39±2.14a	38.80±0.71b
	9	4.05±0.33b	6.43±0.47b	18.48±0.11ab	21.67±1.23a	15.35±1.03ab	34.02±1.10d
	17	0.60±0.06c	5.50±0.54c	17.64±0.20ab	19.53±3.24a	19.02±3.54a	37.71±0.69bc
-26	1	0.59±0.16c	4.52±0.82b	22.61±0.07a	21.59±1.29a	14.53±0.52c	36.15±0.01a
	3	2.90±0.34b	5.74±0.59a	12.01±1.91d	25.11±0.27a	20.12±0.17b	34.13±1.74a
	5	1.78±1.24bc	3.36±0.03c	16.86±1.18b	24.36±2.70a	21.49±2.26b	32.15±1.85bc
	9	9.67±0.47a	4.65±0.19b	14.73±0.89bc	23.55±3.09a	18.57±0.59b	28.81±2.90c
	17	1.35±0.24bc	2.85±0.04c	13.35±0.30cd	25.65±4.06a	29.02±2.83a	27.79±1.20c

指标	温度	循环次数	温度×循环次数
>2 mm	P<0.01^**	P<0.01^**	P<0.01^**
2~1 mm	P<0.05^*	P<0.01^**	P<0.01^**
1~0.5 mm	P<0.01^**	P<0.01^**	P<0.01^**
0.5~0.25 mm	P<0.01^**	0.252	P<0.05^*
0.25~0.053 mm	P<0.01^**	P<0.05^*	P<0.01^**
<0.053 mm	P<0.01^**	P<0.01^**	P<0.01^**
分形维数	P<0.01^**	P<0.01^**	P<0.01^**
SOC_{>2 mm}	P<0.01^**	P<0.01^**	P<0.01^**
SOC_{2~1 mm}	0.995	0.77	0.754
SOC_{1~0.5 mm}	0.235	0.891	0.822
SOC_{0.5~0.25 mm}	0.284	0.528	0.843
SOC_{0.25~0.053 mm}	P<0.01**	P<0.05*	P<0.01**
SOC_{<0.053 mm}	0.83	0.996	0.767

指标	温度	循环次数	温度×循环次数
>2 mm	P<0.01^**	P<0.01^**	P<0.01^**
2~1 mm	P<0.05^*	P<0.01^**	P<0.01^**
1~0.5 mm	P<0.01^**	P<0.01^**	P<0.01^**
0.5~0.25 mm	P<0.01^**	0.252	P<0.05^*
0.25~0.053 mm	P<0.01^**	P<0.05^*	P<0.01^**
<0.053 mm	P<0.01^**	P<0.01^**	P<0.01^**
分形维数	P<0.01^**	P<0.01^**	P<0.01^**
SOC_{>2 mm}	P<0.01^**	P<0.01^**	P<0.01^**
SOC_{2~1 mm}	0.995	0.77	0.754
SOC_{1~0.5 mm}	0.235	0.891	0.822
SOC_{0.5~0.25 mm}	0.284	0.528	0.843
SOC_{0.25~0.053 mm}	P<0.01**	P<0.05*	P<0.01**
SOC_{<0.053 mm}	0.83	0.996	0.767

温度/℃	团聚体粒级/mm
温度/℃	>2	2~1	1~0.5	0.5~0.25	0.25~0.053	<0.053
-9	0.036	-0.893^**	-0.983^**	-0.650^*	0.26	0.988^**
-18	-0.184	-0.505	0.274	-0.924^**	-0.232	0.991^**
-26	-0.134	0.502	0.257	-0.575^*	-0.518	0.843^**