Effects of Clay Mineral Amendments on Soil Organic Carbon Accumulation in Newly Reclaimed Sandy Loam Farmland

doi:10.11923/j.issn.2095-4050.cjas20190700137

Abstract

Abstract:

To understand the role of clay mineral amendments in improving the soil fertility of newly reclaimed farmland, four clay minerals, bentonite, kaolinite, zeolite and diatomite, were selected for testing their effects on mineralization of organic fertilizers and accumulation of soil organic carbon by incubation experiments with 10% addition of the amendments. The results showed that the addition of clay minerals could significantly increase the accumulation of soil organic carbon as compared with the control, and the effect decreased in the order of bentonite> kaolinite> diatomite> zeolite. Aggregate measurement and heavy liquid fractionation showed that the addition of clay minerals could significantly increase the amount of water-stable aggregates in the soils and promote the formation of mineral-bound organic carbon. In general, clay minerals could increase the stability of organic carbon, which is the main reason for increasing organic carbon accumulation in the soils.

Key words: Clay Minerals, Organic Carbon Accumulation, Newly Cultivated Farmland, Soil Aggregates, Sandy Loam

CLC Number:

S158.5

LV Xiaohan, ZHANG Mingkui, YAN Jianli. Effects of Clay Mineral Amendments on Soil Organic Carbon Accumulation in Newly Reclaimed Sandy Loam Farmland[J]. Journal of Agriculture, 2021, 11(12): 48-52.

Figures/Tables 5

References 26

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项目	pH	有机质/(g/kg)	氧化铁/(g/kg)	>2 mm砾石/%	细土组成/(g/kg)
项目	pH	有机质/(g/kg)	氧化铁/(g/kg)	>2 mm砾石/%	2~0.20 mm	0.20~0.02 mm	0.02~0.002 mm	<0.002 mm
测定值	5.08	7.52	7.48	6	198	409	291	102

项目	pH	有机质/(g/kg)	氧化铁/(g/kg)	>2 mm砾石/%	细土组成/(g/kg)
项目	pH	有机质/(g/kg)	氧化铁/(g/kg)	>2 mm砾石/%	2~0.20 mm	0.20~0.02 mm	0.02~0.002 mm	<0.002 mm
测定值	5.08	7.52	7.48	6	198	409	291	102

处理	>5 mm	2~5 mm	0.25~2 mm	0.053~0.25 mm	<0.053 mm	>0.25 mm
空白对照	0.00±0.00d	3.87±1.12c	19.67±2.14b	67.79±3.65a	8.67±1.64a	23.54±2.14e
有机肥对照	5.68±1.85c	9.78±2.14b	22.52±2.35ab	55.30±3.23b	6.72±1.35b	37.98±2.66d
膨润土	13.65±2.65a	14.65±2.41a	24.96±2.19a	42.46±3.01d	4.28±1.02c	53.26±3.24a
高岭土	10.68±2.32ab	13.54±2.08a	24.45±1.68a	45.64±2.96cd	5.69±1.05bc	48.67±2.54b
沸石	8.75±1.95b	11.33±1.98ab	25.26±2.23a	48.52±2.58c	6.14±1.25b	45.34±2.74bc
硅藻土	8.13±1.56b	12.24±1.65ab	21.81±2.08ab	51.54±3.15bc	6.28±1.32b	42.18±2.89c

处理	>5 mm	2~5 mm	0.25~2 mm	0.053~0.25 mm	<0.053 mm	>0.25 mm
空白对照	0.00±0.00d	3.87±1.12c	19.67±2.14b	67.79±3.65a	8.67±1.64a	23.54±2.14e
有机肥对照	5.68±1.85c	9.78±2.14b	22.52±2.35ab	55.30±3.23b	6.72±1.35b	37.98±2.66d
膨润土	13.65±2.65a	14.65±2.41a	24.96±2.19a	42.46±3.01d	4.28±1.02c	53.26±3.24a
高岭土	10.68±2.32ab	13.54±2.08a	24.45±1.68a	45.64±2.96cd	5.69±1.05bc	48.67±2.54b
沸石	8.75±1.95b	11.33±1.98ab	25.26±2.23a	48.52±2.58c	6.14±1.25b	45.34±2.74bc
硅藻土	8.13±1.56b	12.24±1.65ab	21.81±2.08ab	51.54±3.15bc	6.28±1.32b	42.18±2.89c

处理	土壤	>5 mm	2~5 mm	0.25~2 mm	0.053~0.25 mm	<0.053 mm
空白对照	7.41±0.21d	/	8.14±0.22e	5.94±0.18b	7.08±0.27d	13.25±0.11f
有机肥对照	10.54±0.34c	13.65±0.36c	12.35±0.38d	9.24±0.36a	9.39±0.24c	18.65±0.21e
膨润土	12.40±0.41a	16.66±0.41a	15.65±0.43a	9.73±0.37a	10.37±0.31a	23.87±0.19a
高岭土	12.05±0.38a	15.34±0.52b	14.57±0.39b	9.48±0.41a	10.67±0.29a	22.54±0.21b
沸石	11.39±0.31b	15.05±0.43b	13.98±0.46c	9.24±0.32a	9.83±0.32b	21.89±0.19f
硅藻土	11.67±0.28b	15.32±0.38b	14.13±0.42bc	9.38±0.35a	10.17±0.36ab	22.08±0.14c