Effects of simulated acid rain on dissolution characteristics and fraction of phosphorus in tea garden soil

doi:10.3969/j.issn.1004-1524.2022.12.13

Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (12): 2700-2709.DOI: 10.3969/j.issn.1004-1524.2022.12.13

• Environmental Science • Previous Articles Next Articles

Effects of simulated acid rain on dissolution characteristics and fraction of phosphorus in tea garden soil

YAO Longren¹(), WANG Xiaojun¹, ZHUO Chao², LENG Mingzhu³, NI Wuzhong¹^,^*()

1. Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
2. Zhejiang Anji Summit Angeltea Co., Ltd., Anji 313300, Zhejiang, China
3. Bureau of Agriculture and Rural Affairs of Anji County, Zhejiang Province, Anji 313300, Zhejiang, China

Received:2021-12-10 Online:2022-12-25 Published:2022-12-26
Contact: NI Wuzhong

Abstract

Abstract:

In order to explore the internal relationship between acid rain and soil phosphorus loss, the effects of simulated acid rain on phosphorus leaching dynamic characteristics and phosphorus form changes in tea garden soil were studied by soil column experiment. Four treatments were designed in this experiment: T1, simulated acid rain with pH value of 3.5; T2, simulated acid rain with pH value of 4.5; T3, simulated acid rain with pH value of 5.5; CK, distilled water with pH value of 6.5 as control. The results showed that the accumulative dissolution amount of total dissolved phosphorus (TDP) under T1, T2, T3 treatments was significantly (P<0.05) higher than that of CK by 17.3%, 38.8% and 20.4, respectively. The accumulative dissolution amount of dissolved organic phosphorus (DOP) under T1 and T2 treatments was also significantly (P<0.05) higher than that of CK. The regression analysis results showed that the relationship between the accumulative dissolution amount of total phosphorus (TP), the accumulative dissolution amount of dissolved inorganic phosphorus (DIP) and the leaching volume fit the first-order kinetic equation (R²>0.999). Compared with CK, the maximum accumulative dissolution amount of DIP under T1, T2, T3 treatments was increased by 16.0%, 49.9% and 16.0%, respectively, and the maximum accumulative dissolution amount of TP under T2 treatment was increased by 13.4%. After leaching with the simulated acid rain, the mass fraction of NaHCO₃ extractable inorganic phosphorus and NaHCO₃ extractable total phosphorus in tea garden soil was significantly (P<0.05) increased compared with CK, yet the mass fraction of NH₄Cl extractable inorganic phosphorus, NaOH extractable inorganic phosphorus, and concentrated hydrochloric acid extractable total phosphorus was significantly (P<0.05) decreased. In general, acid rain could directly promote the release of inorganic and organic phosphorus from soil, increase the proportion of active phosphorus components in soil, and eventually increase the risk of soil phosphorus loss.

Key words: acid rain, tea garden soil, phosphorus dissolution, phosphorus loss

CLC Number:

S153.6

YAO Longren, WANG Xiaojun, ZHUO Chao, LENG Mingzhu, NI Wuzhong. Effects of simulated acid rain on dissolution characteristics and fraction of phosphorus in tea garden soil[J]. Acta Agriculturae Zhejiangensis, 2022, 34(12): 2700-2709.

Figures/Tables 11

References 30

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处理Treatment	回归方程Regression equation	R²
T1	y₁=2.514 7×(1-e^-0^.^{208 7}^x)	0.999 8
T2	y₁=3.061 7×(1-e^-0^.^{221 8}^x)	0.999 8
T3	y₁=2.705 4×(1-e^-0^.^{229 0}^x)	0.999 9
CK	y₁=2.701 1×(1-e^-0^.^{175 4}^x)	0.999 9

处理Treatment	回归方程Regression equation	R²
T1	y₁=2.514 7×(1-e^-0^.^{208 7}^x)	0.999 8
T2	y₁=3.061 7×(1-e^-0^.^{221 8}^x)	0.999 8
T3	y₁=2.705 4×(1-e^-0^.^{229 0}^x)	0.999 9
CK	y₁=2.701 1×(1-e^-0^.^{175 4}^x)	0.999 9

处理Treatment	回归方程Regression equation	R²
T1	y₂=0.952 9×(1-e^-0^.^{279 9}^x)	0.999 9
T2	y₂=1.232 0×(1-e^-0^.^{299 2}^x)	0.999 1
T3	y₂=0.954 4×(1-e^-0^.^{406 3}^x)	0.999 2
CK	y₂=0.821 7×(1-e^-0^.^{305 4}^x)	0.999 9

处理Treatment	回归方程Regression equation	R²
T1	y₂=0.952 9×(1-e^-0^.^{279 9}^x)	0.999 9
T2	y₂=1.232 0×(1-e^-0^.^{299 2}^x)	0.999 1
T3	y₂=0.954 4×(1-e^-0^.^{406 3}^x)	0.999 2
CK	y₂=0.821 7×(1-e^-0^.^{305 4}^x)	0.999 9

处理Treatment	TP	TDP	DIP	DOP	PP
T1	1.41±0.03 c	1.15±0.01 b	0.64±0.01 c	0.50±0.02 a	0.27±0.04 b
T2	1.79±0.05 a	1.36±0.02 a	0.87±0.01 a	0.50±0.03 a	0.43±0.03 a
T3	1.62±0.02 b	1.18±0.02 b	0.77±0.01 b	0.40±0.03 b	0.45±0.03 a
CK	1.36±0.01 c	0.98±0.03 c	0.58±0.01 d	0.40±0.01 b	0.38±0.01 a

Effects of simulated acid rain on dissolution characteristics and fraction of phosphorus in tea garden soil

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Figures/Tables 11

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处理Treatment	TP	P₁	P₂	P₃	P₄	P₅	P₆	P₇	P₈	P₉
T1	948.0 a	10.0 b	60.8 b	71.3 a	395.4 b	221.0 a	7.2 b	110.2 b	7.9 b	64.3 a
T2	947.3 a	9.3 c	64.0 a	71.5 a	391.1 b	221.1 a	8.2 a	114.5 a	6.2 b	61.6 c
T3	948.2 a	9.2 c	62.2 ab	67.4 a	395.3 b	222.8 a	6.5 b	113.7 ab	8.3 b	62.8 b
CK	950.9 a	10.6 a	57.6 c	60.1 b	411.4 a	216.8 a	6.8 b	110.2 b	13.1 a	64.4 a

处理Treatment	P₁	P₂	P₃	P₄	P₅	P₆	P₇	P₈	P₉
T1	1.05 b	6.41 b	7.52 a	41.70 b	23.32 a	0.76 b	11.62 b	0.83 b	6.78 a
T2	0.98 c	6.76 a	7.54 a	41.29 b	23.34 a	0.86 a	12.08 a	0.65 b	6.50 c
T3	0.97 c	6.56 ab	7.10 a	41.69 b	23.49 a	0.69 b	11.99 ab	0.87 b	6.63 b
CK	1.11 a	6.05 c	6.32 b	43.27 a	22.80 a	0.71 b	11.58 b	1.38 a	6.77 a

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