Effects of different materials on leaching characteristics of salinity in coastal saline-alkali soil

doi:10.3969/j.issn.1004-1524.2022.07.16

Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (7): 1485-1492.DOI: 10.3969/j.issn.1004-1524.2022.07.16

• Environmental Science • Previous Articles Next Articles

Effects of different materials on leaching characteristics of salinity in coastal saline-alkali soil

ZHOU Wenzhi(), LI Suyan(), SUN Xiangyang, LI Xiaochong, ZHA Guichao, WEI Ningxian

Key Laboratory for Silviculture and Conservation of Ministry of Education, College of Forestry, Beijing Forestry University, Beijing 100083, China

Received:2020-08-30 Online:2022-07-25 Published:2022-07-26
Contact: LI Suyan

Abstract

Abstract:

In the present study, the effect of addition of wood vinegar (diluted 400 time, 200 mL), fly ash (soil volume fraction of 10%) and garden waste compost (soil mass fraction of 4%) on leaching characteristics of salinity in coastal saline-alkali soil were examined via soil column experiment. The changes of electrical conductivity (EC), pH and water-soluble ions (K⁺, Na⁺, Ca²⁺, Mg²⁺, Cl^-, SO^2-₄、CO^2-₃、HCO^-₃) in the leaching solution and soil after leaching were determined. It was shown that, compared with CK, addition of wood vinegar, fly ash and garden waste compost could increase the leaching of water-soluble ions and reduce the time consumption by 6, 12, 2 d, respectively, when the EC of leaching solution was reduced to 2 mS·cm^-1 and below. With addition of fly ash, the soil pH and EC in soil were significantly (P<0.05) decreased after leaching. However, with addition of wood vinegar or garden waste compost, the soil pH was significantly (P<0.05) decreased, yet soil EC was significantly (P<0.05) increased after leaching. Therefore, under the experiment conditions, addition of fly ash showed the best promotion effect on salinity leaching.

Key words: fly ash, garden waste compost, wood vinegar, coastal saline-alkali soil, soil column leaching

CLC Number:

S156.4

ZHOU Wenzhi, LI Suyan, SUN Xiangyang, LI Xiaochong, ZHA Guichao, WEI Ningxian. Effects of different materials on leaching characteristics of salinity in coastal saline-alkali soil[J]. Acta Agriculturae Zhejiangensis, 2022, 34(7): 1485-1492.

Figures/Tables 7

Table 1 Basic physicochemical properties of test materials

试验材料 Experiment material	pH	EC/(mS· cm^-1)	Na⁺/(g· kg^-1)	Ca²⁺/(g· kg^-1)	Mg²⁺/(g· kg^-1)	K⁺/(g· kg^-1)	Cl^-/(g· kg^-1)	$SO 4 2 -$ / (g·kg^-1)	$CO 3 2 -$ + $HCO 3 -$ / (g·kg^-1)
滨海盐碱土	8.35	3.56	1.66	0.23	0.22	0.11	4.16	0.89	0.62
Coastal saline-alkali soil
粉煤灰Fly ash	8.01	1.20	0.30	1.01	0.21	0.09	0.45	2.23	0.42
园林废弃物堆肥	7.56	5.53	0.43	1.06	0.48	0.38	3.93	4.06	1.09
Garden waste compost
木醋液Wood vinegar	3.00	4.14	—	—	—	—	—	—	—

Table 1 Basic physicochemical properties of test materials

试验材料 Experiment material	pH	EC/(mS· cm^-1)	Na⁺/(g· kg^-1)	Ca²⁺/(g· kg^-1)	Mg²⁺/(g· kg^-1)	K⁺/(g· kg^-1)	Cl^-/(g· kg^-1)	$SO 4 2 -$ / (g·kg^-1)	$CO 3 2 -$ + $HCO 3 -$ / (g·kg^-1)
滨海盐碱土	8.35	3.56	1.66	0.23	0.22	0.11	4.16	0.89	0.62
Coastal saline-alkali soil
粉煤灰Fly ash	8.01	1.20	0.30	1.01	0.21	0.09	0.45	2.23	0.42
园林废弃物堆肥	7.56	5.53	0.43	1.06	0.48	0.38	3.93	4.06	1.09
Garden waste compost
木醋液Wood vinegar	3.00	4.14	—	—	—	—	—	—	—

Fig.1 Diagram of leaching device

Fig.2 Changes of electrical conductivity (EC) of leaching solution under different treatments

Fig.3 Changes of main cations concentrations in leaching solution under different treatments

Fig.4 Changes of main anions concentrations in leaching solution under different treatments

Table 2 Salinity indexes of soil after leaching under different treatments

处理 Treatment	pH	EC/(mS· cm^-1)	SAR
CK	7.93±0.13 a	0.24±0.05 b	13.19±0.13 c
T1	7.78±0.11 b	0.27±0.07 a	13.28±0.06 b
T2	7.71±0.07 c	0.19±0.05 c	5.72±0.08 d
T3	7.77±0.08 b	0.29±0.09 a	15.14±0.04 a

Table 3 Contents of main ions in soil after leaching under different treatments mg·kg-1

处理	K⁺	Na⁺	Ca²⁺	Mg²⁺	Cl^-	$SO 4 2 -$	$CO 3 2 -$ + $HCO 3 -$
Treatment
CK	21.39±0.12 b	113.58±0.03 c	83.21±0.09 c	65.11±0.16 b	58.43±0.12 b	89.02±0.03 b	60.02±0.06 c
T1	16.85±0.06 b	115.14±0.05 b	88.32±0.05 b	62.01±0.11 c	41.81±0.09 c	80.85±0.05 c	66.5±0.08 b
T2	18.39±0.11 b	42.58±0.10 d	68.54±0.14 d	42.28±0.05 d	23.60±0.05 d	68.40±0.07 d	35.84±0.09 d
T3	42.30±0.14 a	141.67±0.07 a	98.62±0.11 a	76.46±0.07 a	62.14±0.06 a	98.51±0.09 a	78.68±0.11 a

Table 3 Contents of main ions in soil after leaching under different treatments mg·kg-1

处理	K⁺	Na⁺	Ca²⁺	Mg²⁺	Cl^-	$SO 4 2 -$	$CO 3 2 -$ + $HCO 3 -$
Treatment
CK	21.39±0.12 b	113.58±0.03 c	83.21±0.09 c	65.11±0.16 b	58.43±0.12 b	89.02±0.03 b	60.02±0.06 c
T1	16.85±0.06 b	115.14±0.05 b	88.32±0.05 b	62.01±0.11 c	41.81±0.09 c	80.85±0.05 c	66.5±0.08 b
T2	18.39±0.11 b	42.58±0.10 d	68.54±0.14 d	42.28±0.05 d	23.60±0.05 d	68.40±0.07 d	35.84±0.09 d
T3	42.30±0.14 a	141.67±0.07 a	98.62±0.11 a	76.46±0.07 a	62.14±0.06 a	98.51±0.09 a	78.68±0.11 a

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Effects of different materials on leaching characteristics of salinity in coastal saline-alkali soil

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