Effects of 8 Salt-tolerant Plants and Desulfurization Gypsum on the Water-stable Aggregates of Saline-alkali Soil in Hetao Irrigation District

doi:10.11924/j.issn.1000-6850.casb2021-0040

Abstract

Abstract:

To explore the influence of planting different salt-tolerant plants and using desulfurization gypsum on the water-stable aggregates of saline-alkali soil in Hetao Irrigation District, this study added desulfurization gypsum and planted 8 typical salt-tolerant plants on the sulfate saline-alkali soil in Hetao Irrigation District in Inner Mongolia, and compared the characteristics of soil water-stable aggregates before and after planting, to screen out suitable salt-tolerant plants. The results showed that after planting salt-tolerant plants, the mass fraction of <0.01 mm soil aggregates decreased by 44%-65%, while the mass fraction of >0.25 mm and 0.25-0.053 mm soil aggregates increased by 95%-203% and 21%-66%, respectively. The mass fraction of 0.053-0.01 mm aggregates did not change significantly. Organic carbon and total nitrogen increased significantly at all levels of aggregates, especially in >0.25 mm water-stable aggregates, where organic carbon and total nitrogen increased by 13%-90% and 75%-179%, respectively. There were obvious differences among different salt-tolerant plants, among which the effect of perennial legumes was more obvious. The mass fraction of >0.25 mm and 0.25-0.053 mm aggregates showed a significantly negative correlation with soil pH, EC, and Na ⁺, Mg²⁺, SO₄^2- and Cl^- contents, but a very significantly positive correlation with organic carbon and total nitrogen contents, while the mass fraction of <0.01 mm soil aggregates was the opposite. In conclusion, salt ions decide small aggregates and the big aggregate depends on the organic matter content. Planting salt-tolerant plants could reduce the salt content, at the same time improve the organic matter content, thus promote the mineral soil particles aggregation in saline-alkali soil, and form larger water-stable aggregates. Perennial salt-tolerant plants, such as switchgrass, alfalfa and sweet clover have better effect, which could effectively improve saline soil in the area.

Key words: Hetao Irrigation District, saline-alkali soil, soil improvement, salt-tolerant plant, desulfurization gypsum, water-stable soil aggregate, organic carbon, total nitrogen

CLC Number:

S156.4

Xiao Hongyang, Li Mozhi, Lin Qimei, Li Erzhen, Li Guitong, Zhao Xiaorong. Effects of 8 Salt-tolerant Plants and Desulfurization Gypsum on the Water-stable Aggregates of Saline-alkali Soil in Hetao Irrigation District[J]. Chinese Agricultural Science Bulletin, 2021, 37(34): 90-96.

Figures/Tables 4

References 32

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土壤	pH	电导率EC/ (μS/cm)	离子含量/(mmol/kg)								有机碳/ (g/kg)	全氮/ (g/kg)
土壤	pH	电导率EC/ (μS/cm)	K⁺	Na⁺	Ca²⁺	Mg²⁺	CO₃^2-	HCO₃^-	Cl^-	SO₄^2-	有机碳/ (g/kg)	全氮/ (g/kg)
初始值	8.15	407	0.43	17.98	6.20	5.30	0.13	2.53	3.09	28.68	2.14	0.25
AS	7.30	283	0.18	10.06	7.60	8.05	0.00	1.28	0.98	25.27	2.29	0.32
HA	7.38	292	0.11	9.73	7.10	9.15	0.00	1.26	0.98	27.25	2.30	0.30
VV	7.57	306	0.11	12.15	8.55	4.60	0.00	1.35	1.19	27.25	2.54	0.34
SC	7.52	339	0.11	14.35	9.55	3.50	0.00	1.95	3.25	26.37	2.75	0.37
MO	7.58	290	0.30	9.18	7.55	2.20	0.00	2.29	1.07	17.77	2.87	0.34
PV	7.40	226	0.21	9.84	8.85	5.65	0.00	1.44	0.86	25.80	2.95	0.32
LC	7.50	297	0.21	12.04	7.50	3.35	0.00	2.53	1.38	19.07	2.27	0.26
MS	7.41	258	0.18	7.75	6.85	1.85	0.00	2.34	1.16	15.74	3.31	0.35
均值	7.53	299.78	0.20	11.45	7.75	4.85	0.01	1.89	1.55	23.69	2.60	0.32
LSD_0.05	0.37	5.12	0.24	1.30	0.76	1.16	0.15	0.55	0.71	1.62	0.46	0.15
变异系数/%	3.30	15.83	51.31	27.30	13.57	51.41	300.00	29.34	60.00	20.24	15.02	12.34

土壤	pH	电导率EC/ (μS/cm)	离子含量/(mmol/kg)								有机碳/ (g/kg)	全氮/ (g/kg)
土壤	pH	电导率EC/ (μS/cm)	K⁺	Na⁺	Ca²⁺	Mg²⁺	CO₃^2-	HCO₃^-	Cl^-	SO₄^2-	有机碳/ (g/kg)	全氮/ (g/kg)
初始值	8.15	407	0.43	17.98	6.20	5.30	0.13	2.53	3.09	28.68	2.14	0.25
AS	7.30	283	0.18	10.06	7.60	8.05	0.00	1.28	0.98	25.27	2.29	0.32
HA	7.38	292	0.11	9.73	7.10	9.15	0.00	1.26	0.98	27.25	2.30	0.30
VV	7.57	306	0.11	12.15	8.55	4.60	0.00	1.35	1.19	27.25	2.54	0.34
SC	7.52	339	0.11	14.35	9.55	3.50	0.00	1.95	3.25	26.37	2.75	0.37
MO	7.58	290	0.30	9.18	7.55	2.20	0.00	2.29	1.07	17.77	2.87	0.34
PV	7.40	226	0.21	9.84	8.85	5.65	0.00	1.44	0.86	25.80	2.95	0.32
LC	7.50	297	0.21	12.04	7.50	3.35	0.00	2.53	1.38	19.07	2.27	0.26
MS	7.41	258	0.18	7.75	6.85	1.85	0.00	2.34	1.16	15.74	3.31	0.35
均值	7.53	299.78	0.20	11.45	7.75	4.85	0.01	1.89	1.55	23.69	2.60	0.32
LSD_0.05	0.37	5.12	0.24	1.30	0.76	1.16	0.15	0.55	0.71	1.62	0.46	0.15
变异系数/%	3.30	15.83	51.31	27.30	13.57	51.41	300.00	29.34	60.00	20.24	15.02	12.34

土壤	>0.25 mm			0.25~0.053 mm			0.053~0.01 mm			<0.01 mm
土壤	质量分数/ %	有机碳/ (g/kg)	占比/%	质量分数/ %	有机碳/ (g/kg)	占比/ %	质量分数/ %	有机碳/ (g/kg)	占比/ %	质量分数/ %	有机碳/ (g/kg)	占比/ %
初始值	0.88	13.97	5.76	16.78	1.93	15.13	72.26	1.89	63.76	6.63	6.24	19.29
AS	2.22	17.52	16.93	23.78	2.07	21.42	68.99	1.98	59.46	2.32	7.04	7.14
HA	1.72	26.58	19.96	24.50	2.01	21.47	68.54	1.74	51.97	2.33	6.27	6.35
VV	2.21	21.54	18.78	24.46	2.55	24.57	67.75	1.85	49.36	3.15	6.87	8.55
SC	2.16	24.27	19.01	20.55	2.34	17.44	71.72	2.16	56.12	2.71	7.44	7.31
MO	2.54	25.48	22.50	20.38	2.42	17.16	71.77	2.04	50.94	3.69	6.73	8.63
PV	2.60	15.74	13.89	27.83	2.55	24.05	66.08	2.34	52.41	3.72	6.74	8.52
LC	1.95	18.73	16.09	20.68	1.91	17.41	70.87	1.86	57.98	2.79	6.31	7.73
MS	2.67	18.25	14.76	24.30	2.64	19.43	67.74	2.54	51.93	3.69	6.77	7.57
均值	2.11	20.23	16.41	22.58	2.27	19.79	69.52	2.04	54.88	3.45	6.71	9.01
LSD_0.05	0.55	1.56	1.62	1.33	0.40	1.34	1.09	0.37	1.61	0.85	0.46	1.46
变异系数/%	26.30	22.02	29.31	14.47	12.74	16.62	3.16	12.60	8.65	38.24	5.89	43.59

土壤	>0.25 mm			0.25~0.053 mm			0.053~0.01 mm			<0.01 mm
土壤	质量分数/ %	有机碳/ (g/kg)	占比/%	质量分数/ %	有机碳/ (g/kg)	占比/ %	质量分数/ %	有机碳/ (g/kg)	占比/ %	质量分数/ %	有机碳/ (g/kg)	占比/ %
初始值	0.88	13.97	5.76	16.78	1.93	15.13	72.26	1.89	63.76	6.63	6.24	19.29
AS	2.22	17.52	16.93	23.78	2.07	21.42	68.99	1.98	59.46	2.32	7.04	7.14
HA	1.72	26.58	19.96	24.50	2.01	21.47	68.54	1.74	51.97	2.33	6.27	6.35
VV	2.21	21.54	18.78	24.46	2.55	24.57	67.75	1.85	49.36	3.15	6.87	8.55
SC	2.16	24.27	19.01	20.55	2.34	17.44	71.72	2.16	56.12	2.71	7.44	7.31
MO	2.54	25.48	22.50	20.38	2.42	17.16	71.77	2.04	50.94	3.69	6.73	8.63
PV	2.60	15.74	13.89	27.83	2.55	24.05	66.08	2.34	52.41	3.72	6.74	8.52
LC	1.95	18.73	16.09	20.68	1.91	17.41	70.87	1.86	57.98	2.79	6.31	7.73
MS	2.67	18.25	14.76	24.30	2.64	19.43	67.74	2.54	51.93	3.69	6.77	7.57
均值	2.11	20.23	16.41	22.58	2.27	19.79	69.52	2.04	54.88	3.45	6.71	9.01
LSD_0.05	0.55	1.56	1.62	1.33	0.40	1.34	1.09	0.37	1.61	0.85	0.46	1.46
变异系数/%	26.30	22.02	29.31	14.47	12.74	16.62	3.16	12.60	8.65	38.24	5.89	43.59

土壤	>0.25 mm			0.25~0.053 mm			0.053~0.01 mm			<0.01 mm
土壤	含量/ (g/kg)	占比/ %	C/N	含量/ (g/kg)	占比/ %	C/N	含量/ (g/kg)	占比/ %	C/N	含量/ (g/kg)	占比/ %	C/N
初始值	0.82	2.83	17.09	0.24	15.65	8.14	0.21	59.38	9.03	0.78	20.30	7.99
AS	1.58	10.82	11.07	0.29	21.61	7.01	0.27	57.59	7.30	0.96	6.88	7.34
HA	2.13	12.37	12.50	0.28	23.13	7.19	0.22	51.14	7.87	0.82	6.42	7.66
VV	1.86	12.15	11.57	0.29	20.88	8.81	0.27	54.40	6.79	0.90	8.40	7.62
SC	1.96	11.48	12.37	0.33	18.33	7.11	0.31	60.75	6.90	0.89	6.57	8.31
MO	2.29	17.08	11.12	0.31	18.49	7.84	0.26	54.68	7.87	0.94	10.23	7.13
PV	1.38	11.05	11.42	0.29	25.04	8.73	0.27	54.35	8.76	0.85	9.70	7.98
LC	1.43	10.65	13.06	0.26	20.75	7.25	0.23	61.29	8.18	0.77	8.18	8.17
MS	1.67	12.94	10.90	0.33	23.11	8.03	0.30	60.72	8.34	0.83	8.82	8.19
均值	1.68	11.26	12.35	0.29	20.78	7.79	0.26	57.15	7.89	0.86	9.50	7.82
LSD_0.05	0.49	1.42	1.02	0.13	1.26	0.61	0.14	1.41	0.65	0.19	1.52	0.47
变异系数/%	26.52	32.98	15.61	10.09	13.97	8.87	13.62	6.36	9.88	7.91	44.89	5.21