Chinese Milk Vetch and Straw Returning: Effects on Soil Aggregates and Organic Carbon Distribution

doi:10.11924/j.issn.1000-6850.casb20190400065

Abstract

Abstract:

To study the distribution characteristics of soil aggregates and organic carbon under Chinese milk vetch and straw returning, we selected the rice-Chinese milk vetch rotation experiment in Jingzhou, Hubei, and studied the aggregates and organic carbon by the methods of wet sieve and density fractionation. The results showed that: the content of aggregates in each particle size was mainly >5 mm (57.08%-80.01%), and Chinese milk vetch and straw returning increased the content of aggregates >5 mm and the stability of aggregates; the treatment of Chinese milk vetch returning with chemical fertilizer (NPK+G) and Chinese milk vetch and straw returning with fertilizer (NPK+G+S) significantly increased the content of organic carbon in the aggregates of 5-2 mm, 2-0.25 mm; the aggregates were mainly dominated by the mineral-associated organic carbon; different treatments increased the content of mineral-associated organic carbon and fine particulate organic carbon in aggregates, and reduced the content of coarse particulate organic carbon. Compared with the control (CK), the Chinese milk vetch and straw returning could increase the stability of aggregates and promote the accumulation of fine particulate organic carbon in aggregates.

Key words: Chinese milk vetch, straw, soil aggregates, organic carbon, density fractionation, the stability of aggregates

CLC Number:

S152.4

Zhou Fangliang, Li Feng, Huang Ya’nan, Xu Yonghao, Geng Mingjian, Huang Li. Chinese Milk Vetch and Straw Returning: Effects on Soil Aggregates and Organic Carbon Distribution[J]. Chinese Agricultural Science Bulletin, 2020, 36(20): 65-71.

Figures/Tables 7

References 37

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处理	MWD/mm	GMD/mm	R_>0.25/%	D
CK	4.86±0.19b	1.42±0.09b	84.01±2.71b	2.64±0.04a
NPK	6.33±0.21a	1.98±0.08a	95.15±1.36a	2.39±0.06b
G	6.23±0.38a	1.93±0.14a	94.31±1.96a	2.44±0.09ab
NPK+G	5.96±0.76a	1.83±0.30a	91.73±5.23a	2.46±0.18ab
NPK+S	6.10±0.15a	1.89±0.05a	93.48±1.28a	2.42±0.08b
NPK+G+S	5.82±0.63a	1.76±0.26a	90.58±4.90a	2.53±0.12ab

处理	MWD/mm	GMD/mm	R_>0.25/%	D
CK	4.86±0.19b	1.42±0.09b	84.01±2.71b	2.64±0.04a
NPK	6.33±0.21a	1.98±0.08a	95.15±1.36a	2.39±0.06b
G	6.23±0.38a	1.93±0.14a	94.31±1.96a	2.44±0.09ab
NPK+G	5.96±0.76a	1.83±0.30a	91.73±5.23a	2.46±0.18ab
NPK+S	6.10±0.15a	1.89±0.05a	93.48±1.28a	2.42±0.08b
NPK+G+S	5.82±0.63a	1.76±0.26a	90.58±4.90a	2.53±0.12ab

处理	>5 mm	5~2 mm	2~0.25 mm	0.25~0.053 mm	<0.053 mm
CK	60.31±1.78c	11.26±0.24a	15.28±0.87ab	4.09±0.47ab	9.06±2.04a
NPK	83.73±2.52a	5.09±0.34b	8.23±1.71c	2.02±0.37c	0.93±0.18b
G	69.70±6.17bc	8.06±0.99ab	13.00±2.38abc	2.84±0.29abc	6.39±2.95a
NPK+G	80.90±7.00ab	6.97±2.16b	10.39±4.31bc	2.46±0.87bc	1.65±0.96b
NPK+S	78.97±1.64ab	6.48±1.26b	9.46±0.40bc	2.98±0.75abc	2.10±1.06b
NPK+G+S	60.09±6.24c	10.28±1.86a	17.15±2.64a	4.24±0.86a	7.70±1.37a

处理	>5 mm	5~2 mm	2~0.25 mm	0.25~0.053 mm	<0.053 mm
CK	60.31±1.78c	11.26±0.24a	15.28±0.87ab	4.09±0.47ab	9.06±2.04a
NPK	83.73±2.52a	5.09±0.34b	8.23±1.71c	2.02±0.37c	0.93±0.18b
G	69.70±6.17bc	8.06±0.99ab	13.00±2.38abc	2.84±0.29abc	6.39±2.95a
NPK+G	80.90±7.00ab	6.97±2.16b	10.39±4.31bc	2.46±0.87bc	1.65±0.96b
NPK+S	78.97±1.64ab	6.48±1.26b	9.46±0.40bc	2.98±0.75abc	2.10±1.06b
NPK+G+S	60.09±6.24c	10.28±1.86a	17.15±2.64a	4.24±0.86a	7.70±1.37a

处理	>0.25 mm				0.25~0.053 mm
处理	fLF	cPOC	fPOC	mSOC	fLF	fPOC	mSOC
CK	0.21	0.68	4.17	78.69	0.04	0.53	5.35
NPK	0.26	0.99	4.84	90.39	0.01	0.25	2.06
G	0.32	0.92	5.54	83.35	0.01	0.40	3.26
NPK+G	2.72	1.73	6.69	69.05	0.03	0.36	2.95
NPK+S	2.56	0.96	6.31	82.43	0.02	0.35	3.23
NPK+G+S	2.70	0.93	8.21	74.42	0.06	0.49	4.57