Mulching Measures on Potato-Wheat Rotation Soil Aggregates and the Influence of Its Organic Carbon Components

doi:10.7668/hbnxb.20196150

Abstract

Abstract:

In order to explore the effects of mulching measures(such as straw returning and plastic film mulching)on soil aggregates and organic carbon in semi-arid rain-fed agricultural areas.The potato-wheat rotation system in the dryland of Longzhong was used as the research object.The effects of straw stubble mulching(SR),straw strip mulching(SM),plastic film mulching(PM)and open field(CK)on soil organic carbon components(SOC,POC,MAOC),aggregate stability and aggregate carbon contribution rate were systematically analyzed.By evaluating the soil improvement effect of different mulching measures,integrating the intrinsic indicators such as soil organic carbon component dynamics,aggregate stability and crop productivity and water use efficiency data reported in the literature,the optimal mulching mode that can synergistically improve organic carbon and aggregate stability was screened.The results showed that the organic carbon content and aggregate stability of potato and wheat were improved by three mulching measures in potato-wheat rotation,and the effect of SR treatment was the best.Compared with CK treatment,the SOC content of SR and SM treatment increased by 15.38% and 7.78%,and the SOC content of PM treatment did not change significantly.SR and SM treatment increased the POC content in 0—20 cm soil layer by 18.54%,16.62%,and PM decreased the POC content in 0—20 cm soil layer by 3.06%.The overall trend of MAOC increased in each treatment was SR>SM>PM>CK.Compared with CK treatment,SR and SM treatments increased the proportion of MWD,GMD,>2 mm aggregates and SOC content,while PM significantly reduced MWD and GMD.SR increased the SOC enrichment coefficient of>2 mm aggregates by 17.26% in 0—20 cm soil layer,and SR and SM treatments significantly increased the SOC contribution rate of>2 mm aggregates.In summary,under the conditions of this experiment,all three mulching measures can increase soil organic carbon content,and straw stubble mulching returning to the field has the best effect in improving soil organic carbon content and aggregate stability,effectively improving soil fertility.

Key words: Potato-wheat rotation, Straw mulching to the field, Soil aggregate, Soil organic carbon, Dry farming

CLC Number:

S344.1
S153

DING Desheng, PANG Lei, ZHENG Haofei, YANG Yanbin, GOU Leigang, YANG Nan, WANG Ming, MA Shengfu, WANG Yanting, LU Jianlong, MA Wenhao. Mulching Measures on Potato-Wheat Rotation Soil Aggregates and the Influence of Its Organic Carbon Components[J]. Acta Agriculturae Boreali-Sinica, 2026, 41(4): 163-173. doi: 10.7668/hbnxb.20196150.

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References 43

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作物 Crop	处理 Treatment	平均质量直径 MWD	几何平均直径 GMD
马铃薯	CK	0.59±0.02b	0.25±0.01c
Potato	PM	0.57±0.01b	0.20±0.01d
	SR	0.99±0.02a	0.41±0.00b
	SM	1.03±0.04a	0.45±0.02a
小麦	CK	0.46±0.02b	0.18±0.01b
Wheat	PM	0.38±0.01c	0.15±0.00c
	SR	0.63±0.03a	0.25±0.01a
	SM	0.41±0.01c	0.15±0.01c

作物 Crop	处理 Treatment	平均质量直径 MWD	几何平均直径 GMD
马铃薯	CK	0.59±0.02b	0.25±0.01c
Potato	PM	0.57±0.01b	0.20±0.01d
	SR	0.99±0.02a	0.41±0.00b
	SM	1.03±0.04a	0.45±0.02a
小麦	CK	0.46±0.02b	0.18±0.01b
Wheat	PM	0.38±0.01c	0.15±0.00c
	SR	0.63±0.03a	0.25±0.01a
	SM	0.41±0.01c	0.15±0.01c

作物 Crop	处理 Treatment	0~10 cm			10~20 cm
作物 Crop	处理 Treatment	>2 mm	2~0.25 mm	<0.25 mm	>2 mm	2~0.25 mm	<0.25 mm
马铃薯	CK	1.39±0.10a	2.06±0.03b	1.16±0.05c	1.27±0.06b	1.56±0.05a	1.37±0.06a
Potato	PM	1.53±0.08a	2.14±0.05ab	1.72±0.05a	1.52±0.09a	1.42±0.06ab	1.31±0.03a
	SR	1.38±0.02a	2.19±0.02a	1.39±0.04b	1.36±0.03ab	1.37±0.01b	1.48±0.10a
	SM	1.09±0.02b	1.92±0.01c	1.23±0.02c	1.35±0.02ab	1.42±0.04ab	1.39±0.01a
小麦	CK	1.13±0.01c	1.31±0.08ab	1.01±0.05a	1.50±0.09b	1.49±0.03ab	0.86±0.08c
Wheat	PM	1.17±0.03c	1.11±0.02c	0.92±0.03ab	1.36±0.02b	1.60±0.06a	1.32±0.03a
	SR	1.41±0.02a	1.24±0.04bc	0.79±0.02c	1.76±0.09a	1.48±0.09ab	0.97±0.01bc
	SM	1.27±0.00b	1.41±0.02a	0.84±0.01bc	1.83±0.01a	1.35±0.03b	1.08±0.07b

作物 Crop	处理 Treatment	0~10 cm			10~20 cm
作物 Crop	处理 Treatment	>2 mm	2~0.25 mm	<0.25 mm	>2 mm	2~0.25 mm	<0.25 mm
马铃薯	CK	1.39±0.10a	2.06±0.03b	1.16±0.05c	1.27±0.06b	1.56±0.05a	1.37±0.06a
Potato	PM	1.53±0.08a	2.14±0.05ab	1.72±0.05a	1.52±0.09a	1.42±0.06ab	1.31±0.03a
	SR	1.38±0.02a	2.19±0.02a	1.39±0.04b	1.36±0.03ab	1.37±0.01b	1.48±0.10a
	SM	1.09±0.02b	1.92±0.01c	1.23±0.02c	1.35±0.02ab	1.42±0.04ab	1.39±0.01a
小麦	CK	1.13±0.01c	1.31±0.08ab	1.01±0.05a	1.50±0.09b	1.49±0.03ab	0.86±0.08c
Wheat	PM	1.17±0.03c	1.11±0.02c	0.92±0.03ab	1.36±0.02b	1.60±0.06a	1.32±0.03a
	SR	1.41±0.02a	1.24±0.04bc	0.79±0.02c	1.76±0.09a	1.48±0.09ab	0.97±0.01bc
	SM	1.27±0.00b	1.41±0.02a	0.84±0.01bc	1.83±0.01a	1.35±0.03b	1.08±0.07b

作物 Crop	处理 Treatment	0~10 cm			10~20 cm
作物 Crop	处理 Treatment	>2 mm	2~0.25 mm	<0.25 mm	>2 mm	2~0.25 mm	<0.25 mm
马铃薯	CK	6.96±0.48c	65.78±3.80b	75.44±3.11c	6.51±0.15c	48.07±2.54b	96.09±4.35a
Potato	PM	10.07±0.52b	51.12±1.25c	119.85±3.53a	10.03±0.61b	33.98±1.53c	90.89±2.44a
	SR	9.12±0.17b	52.47±0.52c	96.17±2.60b	20.04±0.40a	50.61±0.48b	71.50±4.69b
	SM	16.24±0.29a	78.02±0.36a	51.61±2.40d	20.03±0.33a	57.60±1.59a	62.01±0.66b
小麦	CK	4.73±0.05c	36.62±2.28a	68.37±3.55a	5.28±0.30c	35.06±0.67a	49.07±4.64c
Wheat	PM	3.71±0.09d	22.16±0.36c	69.58±2.35a	3.17±0.06d	27.42±0.94b	85.91±2.22a
	SR	8.15±0.12a	29.51±0.48b	50.29±1.35b	8.45±0.42a	37.96±2.24a	51.21±0.31c
	SM	6.16±0.03b	22.56±0.25c	66.97±0.49a	7.22±0.03b	17.53±0.42c	69.39±4.32b

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