冻融干湿交替下灰绿板岩矿质元素释放特征及释放模型

doi:10.12118/j.issn.1000-6060.2022.097

Abstract

Abstract:

In response to the problems of soil fertility decline in gravel-mulched land in the arid zone of central Ningxia Hui Autonomons Region, China and unclear leaching and release rules of gray-green slate mineral elements, this study conducted an indoor simulated freeze-thaw and dry-wet cycle experiment of gray-green slate, used the modified Elovich equation, parabolic equation, double constant rate equation, and first-order kinetic equation to fit the cumulative release curve of each mineral element, and study the release kinetic characteristics and optimal fitting kinetic equation of slate with different particle sizes under the action of dry-wet freeze-thaw cycles. The results show that the total leaching of mineral elements in the leaching solution of the gray-green slates of two-grain sizes increases with the number of cycles, and the cumulative total leaching of mineral elements and leaching rate of 1 cm grain size slate are greater than those of 3 cm grain size slate at different cycle times. The release of mineral elements from the gray-green slate was a physical and chemical process controlled by multiple factors, and the release process could be roughly divided into the rapid reaction stage and the reaction to the equilibrium stage. The supply of Ca, K, Mg, and P elements in the gravel-mulched land soil was best predicted by the modified Elovich equation, and the parabolic equation was most suitable for describing the release pattern of S elements. The findings of this study could serve as a decision reference for soil fertility regulation of dry farmlands in the arid zone of central Ningxia.

Key words: freeze-thaw and dry-wet cycle, gray-green slate, mineral element, leachate release

WANG Jie, LI Wangcheng, MU Min, DONG Yaping. Mineral element release characteristics and release models for gray-green slate under alternating freeze-thaw and dry-wet conditions[J].Arid Land Geography, 2022, 45(6): 1795-1804.

Figures/Tables 9

Tab. 1

Expressions of kinetic equations"

方程名称	表达式	引用文献
一级动力学方程	$l n y = a + b x$	[17]
修正的Elovich方程	$y = a + b l n x$	[24]
双常数速率方程（Freundlich修正式）	$l n y = a + b l n x$	[25]
抛物线方程	$y = a + b x 0.5$	[26]

Tab. 1

Fig. 1

Fig. 2

Fig. 3

Tab. 2

Tab. 3

Tab. 4

Tab. 5

Fig. 4

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粒径/cm	元素	方程	决定系数（R²）	平均精度（A）/%
3	Ca	lny=5.259+0.017x	0.767^*	52.991
	K	lny=6.060+0.016x	0.811^*	64.396
	Mg	lny=5.326+0.016x	0.756^*	39.493
	P	lny=2.528+0.015x	0.768^*	70.025
	S	lny=2.418+0.018x	0.919^*	75.061
1	Ca	lny=6.459+0.015x	0.671	54.029
	K	lny=7.274+0.014x	0.694^*	72.753
	Mg	lny=6.291+0.015x	0.629	62.362
	P	lny=3.461+0.013x	0.661^*	68.052
	S	lny=2.794+0.019x	0.858^*	85.724

粒径/cm	元素	方程	决定系数（R²）	平均精度（A）/%
3	Ca	y=-1194.561+444.033lnx	0.978^*	82.915
	K	y=-1976.972+783.465lnx	0.988^**	86.779
	Mg	y=-1029.610+398.601lnx	0.969^*	80.065
	P	y=-52.029+20.999lnx	0.971^*	88.702
	S	y=-62.433+24.301lnx	0.973^*	91.707
1	Ca	y=-2899.032+1134.854lnx	0.923^*	90.219
	K	y=-5543.136+2259.953lnx	0.932^*	94.999
	Mg	y=-2681.822+1025.881lnx	0.895	89.520
	P	y=-107.518+45.157lnx	0.906^*	90.292
	S	y=-104.968+39.410lnx	0.909^*	91.695

粒径/cm	元素	方程	决定系数（R²）	平均精度（A）/%
3	Ca	lny=2.639+0.914lnx	0.890^*	66.020
	K	lny=3.744+0.813lnx	0.926^*	74.912
	Mg	lny=2.964+0.828lnx	0.883^*	55.968
	P	lny=0.346+0.767lnx	0.895^*	79.026
	S	lny=-0.225+0.927lnx	0.981^**	87.140
1	Ca	lny=4.236+0.777lnx	0.815^*	69.131
	K	lny=5.197+0.728lnx	0.837^*	83.409
	Mg	lny=4.002+0.799lnx	0.774^*	74.505
	P	lny=1.512+0.683lnx	0.808^*	78.732
	S	lny=0.005+0.971lnx	0.946^**	95.116

粒径/cm	元素	方程	决定系数（R²）	平均精度（A）/%
3	Ca	y=-445.764+135.948x^0.5	0.940^*	75.084
	K	y=-662.617+240.866x^0.5	0.958^*	80.564
	Mg	y=-354.603+121.627x^0.5	0.925^*	69.751
	P	y=-16.498+6.412x^0.5	0.928^*	83.271
	S	y=-22.843+7.642x^0.5	0.987^**	94.771
1	Ca	y=-950.494+342.39x^0.5	0.861	81.689
	K	y=-1672.109+683.198x^0.5	0.874	89.181
	Mg	y=-910.177+308.029x^0.5	0.828	82.567
	P	y=-29.697+13.583x^0.5	0.841	84.340
	S	y=-40.156+12.306x^0.5	0.968^*	94.561

Mineral element release characteristics and release models for gray-green slate under alternating freeze-thaw and dry-wet conditions

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