Study on Spatial Correlation between Soil pH and Heavy Metal Content in Green Rice Planting Areas of Jilin Province

doi:10.11924/j.issn.1000-6850.casb2025-0115

Abstract

Abstract:

As a national commercial grain base, the soil health of green rice planting areas in Jilin Province is crucial for ensuring food security and ecological safety. This study systematically analyzed the spatial distribution characteristics of soil pH and heavy metal (Cd, Hg, As, Pb, Cr) contents, along with their correlations, across 42 green rice planting areas in Jilin Province. The results indicated that the soil pH in the study area ranged from 4.6 to 10, with a mean pH value of 7.23 and significant spatial heterogeneity (standard deviation of 1.21). The analysis of heavy metal content revealed that the mean concentrations of Cd, Hg, As, Pb, and Cr were 0.1094, 0.043, 8.1, 21.79 and 49.23 mg/kg, respectively. Notably, the levels of Cd and Hg approached or exceeded the screening values for soil environmental risks in certain areas. Correlation analysis demonstrated a significant negative relationship between soil pH and heavy metal contents (P<0.01), particularly for Cd (r=-0.387) and Hg (r=-0.627), suggesting that increased pH could effectively reduce the bioavailability of heavy metals. Further spatial analysis revealed a coupling relationship between heavy metals and pH, indicating significant overlap between low pH regions and areas with high heavy metal content. Based on the findings of this study, recommendations for acidic soil amendment (with a suggested lime application rate of 1500-3000 kg/hm²) and the establishment of a comprehensive heavy metal—pH monitoring network are proposed. These measures could serve as a scientific basis for soil pollution prevention and control, as well as for sustainable agricultural development in the green rice growing areas of Jilin Province.

Key words: Jilin Province, green rice cultivation area, soil pH, heavy metal content, spatial distribution

PAN Peng, DING Yang, YANG Dong, YUE Benqi, SUN Han, YANG Qiuping, MIAO Yu, LIU Yingzi, MENG Guangchao. Study on Spatial Correlation between Soil pH and Heavy Metal Content in Green Rice Planting Areas of Jilin Province[J]. Chinese Agricultural Science Bulletin, 2025, 41(24): 79-87.

Figures/Tables 6

References 25

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处理	总镉	总汞	总砷	总铅	总铬	总铜
极小值	0.03	0	3.72	9.68	14	5
极大值	0.35	0.18	15.8	34.8	104	36
全距	0.32	0.18	12.08	25.12	90	31
均值	10.94×10-2	4.3×10-2	8.1	21.79	49.23	17.94
标准差	5.95×10-2	3.74×10-2	2.96	5.13	20.36	7.68

处理	总镉	总汞	总砷	总铅	总铬	总铜
极小值	0.03	0	3.72	9.68	14	5
极大值	0.35	0.18	15.8	34.8	104	36
全距	0.32	0.18	12.08	25.12	90	31
均值	10.94×10-2	4.3×10-2	8.1	21.79	49.23	17.94
标准差	5.95×10-2	3.74×10-2	2.96	5.13	20.36	7.68

	pH	总镉	总汞	总砷	总铅	总铬	总铜
pH	1
总镉	-0.387^**	1
总汞	-0.627^**	0.599^**	1
总砷	-0.136	0.271^**	0.260^**	1
总铅	-0.365^**	0.386^**	0.399^**	0.539^**	1
总铬	-0.451^**	0.449^**	0.445^**	0.673^**	0.605^**	1
总铜	-0.376^**	0.457^**	0.448^**	0.767^**	0.612^**	0.850^**	1

	pH	总镉	总汞	总砷	总铅	总铬	总铜
pH	1
总镉	-0.387^**	1
总汞	-0.627^**	0.599^**	1
总砷	-0.136	0.271^**	0.260^**	1
总铅	-0.365^**	0.386^**	0.399^**	0.539^**	1
总铬	-0.451^**	0.449^**	0.445^**	0.673^**	0.605^**	1
总铜	-0.376^**	0.457^**	0.448^**	0.767^**	0.612^**	0.850^**	1