紫云英和秸秆还田对土壤团聚体及有机碳分布的影响

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

摘要/Abstract

摘要：

为了研究紫云英和秸秆还田下土壤团聚体及有机碳的分布特征。选取湖北省荆州市水稻—紫云英轮作定位试验,通过湿筛和密度分级的方法研究团聚体和有机碳。结果表明：各粒级团聚体含量以>5 mm为主(57.08%~80.01%),紫云英和秸秆还田增加>5 mm团聚体的含量与团聚体的稳定性。紫云英还田配施化肥(NPK+G)和紫云英和秸秆还田配施化肥(NPK+G+S)处理显著增加5~2、2~0.25 mm团聚体中有机碳的含量。团聚体内以矿物结合态有机碳为主,不同处理均提高团聚体内矿物结合态有机碳及微团聚体内细颗粒有机碳的含量,降低粗颗粒有机碳的含量。相比于对照(CK),紫云英和秸秆还田提高了团聚体的稳定性,并促进了团聚体内细颗粒有机碳的积累。

关键词: 紫云英, 秸秆, 土壤团聚体, 有机碳, 密度分组, 团聚体稳定性

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

中图分类号:

S152.4

周方亮, 李峰, 黄雅楠, 徐永昊, 耿明建, 黄丽. 紫云英和秸秆还田对土壤团聚体及有机碳分布的影响[J]. 中国农学通报, 2020, 36(20): 65-71.

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.

图/表 7

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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