Study on Potassium Release Characteristics of Aeolian Sandy Soil Under Different Land Use Patterns in Zhanggutai,Liaoning Province

doi:10.13466/j.cnki.lyzygl.2023.04.019

Abstract

Abstract:

Understanding the characteristics of soil potassium release under different land use patterns is highly significant for impoving land use and fertility in Aeolian sandy soil.This study used indoor simulation experiments and equation fitting methods to investigate the process,influencing factors and kinetic characteristics of non-exchangeable potassium in the soil in Zhanggutai area of Liaoning Province.The findings revealed two distinct stages of potassium release:rapid release(18~90hrs)and slow release(90~520hrs),with generally higher release in the 0~<20 cm depth compared to the 20~40 cm depth.Different land use types exhibited a positive impact on non-exchangeable potassium release.Specifically,the broad-leaved forest demonstrated the highest cumulative release in the 0~<20 cm soil layer,while the paddy field exhibited the highest release in the 20~40 cm soil layer.The Elovich equation yielded the best fit for the release process of non-exchangeable potassium in Aeolian sandy soil,with determination coefficients(R²)ranging from 0.96 to 0.98 and standard errors(SE)ranging from 0.97 to 2.78.The subsequent best fit was observed with the first-order kinetic equation,and the equation parameters accurately described the potassium supply capacity of Aeolian sandy soil.Non-exchangeable potassium release in the surface soil was closely correlated with soil potassium content,while in the subsoil,it was associated with soil colloid content.

Key words: soil improvement, land use, sandy soil, non-exchangeable potassium release, dynamics

CLC Number:

S153.6

CAO Yili, ZHANG Xueli, LYU Gang, AN Yuning, CHI Linlin, LIU Yang. Study on Potassium Release Characteristics of Aeolian Sandy Soil Under Different Land Use Patterns in Zhanggutai,Liaoning Province[J]. FOREST RESOURCES WANAGEMENT, 2023, 0(4): 161-168.

Figures/Tables 7

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Fig.1

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Fig.2

References 22

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利用方式	利用年限/a	地下水位/m	作物/植被	坡度/(°)
T1	41	0	水稻(Oryza sativa)	<2
T2	41	2.6	玉米、花生(Zea mays and Arachis hypogaea)	<2
T3	41	5.5	羊草(Leymus chinensis)等	<2
T4	41	3.6	小叶锦鸡儿(Caragana microphylla)等	<5
T5	41	9.5	樟子松(Pinus sylvestris var.mongolica)	<5
T6	41	7.8	青甘杨(Populus przewalskii)	<5
T7	41	8.2	樟子松(Pinus sylvestris var.mongolica)×其他阔叶树种	<5

利用方式	土层/cm	RAK/ (mg/kg)	NEK/ (mg/kg)	CEC/ (cmol/kg)	OM/ (g/kg)	pH	NEK累积释放量 (90~520h)/(mg/kg)	NEK累积释放量占比/%
CK	0~<20	5.76c	81.36c	1.26c	0.42d	6.36a	19.55Ae	28.53
CK	20~40	2.84c	87.19c	1.00b	0.14c	6.40a	19.40Ae	26.02
T1	0~<20	30.50c	279.20b	7.70a	10.46a	5.85bc	40.58Bd	15.92
T1	20~40	31.30b	278.70ab	11.11a	7.36a	5.78bc	56.45Aa	22.34
T2	0~<20	64.10ab	328.30ab	4.82abc	6.42b	5.37c	54.07Ab	18.15
T2	20~40	59.30a	361.90a	9.22a	5.55ab	5.45c	50.31Ab	15.36
T3	0~<20	34.00bc	333.90ab	4.21abc	7.33b	6.25ab	58.82Ab	19.17
T3	20~40	22.30b	244.00abc	3.95b	5.02ab	6.15ab	41.68Bc	19.00
T4	0~<20	39.70bc	250.00b	2.03bc	2.92c	6.19ab	44.53Acd	19.86
T4	20~40	26.80b	167.20bc	1.73b	1.49c	6.21ab	26.73Bd	18.57
T5	0~<20	41.90b	332.30ab	4.99abc	7.41b	5.85bc	48.52Ac	16.17
T5	20~40	29.00b	288.50ab	5.03b	4.73b	6.04abc	43.45Ac	16.81
T6	0~<20	83.10a	430.50a	7.04ab	6.48b	6.22ab	82.40Aa	20.95
T6	20~40	39.40b	287.40ab	4.53b	4.29b	6.02abc	51.72Bb	19.83
T7	0~<20	51.30ab	377.90ab	5.35abc	7.91b	5.71c	55.92Ab	16.38
T7	20~40	27.50b	281.50ab	3.95b	4.47b	5.97abc	43.16Bc	17.07

利用方式	零级动力学方程				一级动力学方程				抛物线扩散方程				幂函数方程				Elovich方程
利用方式	a	b	R²	SE	a	b	R²	SE	a	b	R²	SE	a	b	R²	SE	a	b	R²	SE
CK	13.26	0.03	0.88	1.93	2.82	0.01	0.93	1.49	0.23	0.03	0.95	1.32	1.01	0.34	0.94	1.21	-6.94	4.65	0.97	1.03
T1	17.92	0.04	0.76	4.23	3.08	0.01	0.96	2.87	0.44	0.03	0.87	3.09	2.38	0.23	0.91	2.45	-0.09	7.13	0.97	1.59
T2	27.46	0.06	0.78	6.28	3.55	0.01	0.97	3.73	0.35	0.03	0.89	4.42	2.35	0.29	0.91	3.74	-8.99	11.03	0.98	1.98
T3	24.83	0.06	0.76	5.86	3.46	0.01	0.96	3.72	0.46	0.03	0.88	4.26	2.82	0.22	0.92	3.28	1.99	9.97	0.97	2.18
T4	23.16	0.05	0.80	4.83	3.39	0.01	0.96	2.96	0.35	0.03	0.90	3.36	2.20	0.28	0.92	2.78	-6.90	9.01	0.98	1.61
T5	23.80	0.05	0.79	5.13	3.40	0.01	0.96	3.20	0.38	0.03	0.90	3.61	2.39	0.26	0.92	2.90	-4.69	9.32	0.98	1.71
T6	38.19	0.09	0.78	8.66	3.89	0.01	0.96	5.18	0.41	0.03	0.89	6.11	2.99	0.25	0.92	4.80	-4.87	15.28	0.98	2.78
T7	27.66	0.06	0.78	6.26	3.54	0.01	0.96	4.01	0.38	0.03	0.89	4.49	2.48	0.27	0.91	3.73	-6.52	10.94	0.97	2.21

利用方式	零级动力学方程				一级动力学方程				抛物线扩散方程				幂函数方程				Elovich方程
利用方式	a	b	R²	SE	a	b	R²	SE	a	b	R²	SE	a	b	R²	SE	a	b	R²	SE
CK	12.03	0.03	0.87	1.85	2.73	0.01	0.93	1.43	0.28	0.03	0.94	1.29	1.23	0.30	0.94	1.14	-4.87	4.26	0.96	0.97
T1	28.95	0.06	0.77	6.70	3.57	0.01	0.98	4.18	0.35	0.03	0.89	4.71	2.36	0.29	0.91	4.03	-10.10	11.64	0.98	2.05
T2	24.53	0.05	0.77	5.64	3.41	0.01	0.96	3.69	0.38	0.03	0.88	4.05	2.40	0.27	0.91	3.35	-5.25	9.74	0.97	2.00
T3	19.92	0.04	0.81	4.07	3.23	0.01	0.95	2.67	0.41	0.03	0.90	2.88	2.35	0.24	0.93	2.25	-1.80	7.63	0.97	1.50
T4	17.13	0.04	0.85	2.89	3.08	0.01	0.95	1.92	0.25	0.03	0.94	1.93	1.32	0.34	0.93	1.76	-9.09	6.28	0.98	1.10
T5	22.91	0.05	0.80	4.81	3.35	0.01	0.97	2.98	0.34	0.03	0.90	3.34	2.13	0.29	0.92	2.79	-7.48	8.92	0.98	1.52
T6	24.98	0.06	0.79	5.48	3.47	0.01	0.96	3.30	0.39	0.03	0.90	3.84	2.47	0.26	0.93	3.06	-4.74	9.89	0.98	1.77
T7	22.63	0.05	0.79	4.88	3.36	0.01	0.96	3.02	0.34	0.03	0.90	3.43	2.12	0.29	0.92	2.90	-7.55	8.88	0.98	1.63

参数、影响因子及释放量	CEC	NEK	RAK	OM	pH	表层释放量	底层释放量
a1	0.198	0.848^**	0.872^**	0.487	-0.303	0.965^**	0.519
b1	0.245	0.841^**	0.879^**	0.528	-0.283	0.982^**	0.559
a2	0.876^**	0.895^**	0.734^*	0.953^**	-0.685	0.645	0.974^**
b2	0.942^**	0.817^*	0.668	0.953^**	-0.713^*	0.531	0.982^**
表层释放量	0.297	0.854^**	0.824^*	0.617	-0.225	1.000	0.612
底层释放量	0.927^**	0.862^**	0.703	0.977^**	-0.693	0.612	1.000