Analysis of Soil Selenium Bioavailability and Its Influencing Factors Based on DGT Technology

doi:10.19657/j.geoscience.1000-8527.2021.03.05

Abstract

Abstract:

Se is one of the important trace elements in the environment, and the accurate evaluation of its bioavailability has always been controversial. Sixty sets of crop and root soil samples were collected in Linshui County, Guang’an City, Sichuan Province, and the Se content, physical properties, and chemical properties of crops and soil were analyzed. Results showed that the total Se content in the soil of the study area ranged from 0.15 mg/kg to 2.42 mg/kg (average=0.48 mg/kg). The total Se content of the different types of soil in the study area was considerably different and followed the order: lime soil (1.06 mg/kg)>yellow soil (0.78 mg/kg)>purple soil (0.28 mg/kg)>paddy soil (0.27 mg/kg). The organic matter and the total Fe₂O₃ (TFe₂O₃) contents of the lime and the yellow soil samples were remarkably higher than those of the other types of soil. The content of the DGT-Se in the different types of soil in the study area was evidently different. The correlation analysis showed that the soil DGT-Se was significantly related to the total Se, TFe₂O₃, S, organic matter, and Al₂O₃ contents and pH of the soil (p<0.01). The influence of its physical and chemical properties led to differences in the DGT-Se in the different types of the soil. The content of the DGT-Se in the soil of rice roots was significantly positively correlated with the Se content in rice seeds (r=0.55, n=29, p<0.01). The DGT could be used as an indicator for the bioavailability of the soil Se in the rice-root soil system. The type, physical properties, and chemical properties of the soil should be fully considered in the evaluation and the prediction of the available Se content of agricultural soils on a regional scale on the basis of the DGT technology.

Key words: selenium, soil, bioavailability, diffusive gradients in thin-films, Linshui County

CLC Number:

P595
X142

JIANG Tianyu, YU Tao, HOU Qingye, QI Hongbin, WANG Jue, MA Xudong, YANG Zhongfang. Analysis of Soil Selenium Bioavailability and Its Influencing Factors Based on DGT Technology[J]. Geoscience, 2021, 35(03): 637-646.

Figures/Tables 11

References 45

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指标	分析方法	检出限
Al₂O₃	XRF	0.05^*
TFe₂O₃	XRF	0.05^*
pH	pH/ISE	0.1^**
N	加浓碱蒸馏-硼酸吸收-容量法	20
P	XRF	10
S	XRF	50
Se	AFS/ICP-MS	0.01
Corg	重铬酸钾氧化-容量法	0.1^*
Mn	AFS	10

指标	分析方法	检出限
Al₂O₃	XRF	0.05^*
TFe₂O₃	XRF	0.05^*
pH	pH/ISE	0.1^**
N	加浓碱蒸馏-硼酸吸收-容量法	20
P	XRF	10
S	XRF	50
Se	AFS/ICP-MS	0.01
Corg	重铬酸钾氧化-容量法	0.1^*
Mn	AFS	10

样品类型	样品数/个	最小值/ (mg/kg)	最大值/ (mg/kg)	算术平均值/ (mg/kg)	标准偏差/ (mg/kg)	标准误差	中位数/ (mg/kg)	分布情况
土壤	60	0.15	2.42	0.48	0.47	0.06	0.30	符合正态分布
玉米籽实	31	0.02	0.09	0.03	0.01	0.00	0.03	符合正态分布
水稻籽实	29	0.02	0.07	0.04	0.01	0.00	0.03	符合正态分布

样品类型	样品数/个	最小值/ (mg/kg)	最大值/ (mg/kg)	算术平均值/ (mg/kg)	标准偏差/ (mg/kg)	标准误差	中位数/ (mg/kg)	分布情况
土壤	60	0.15	2.42	0.48	0.47	0.06	0.30	符合正态分布
玉米籽实	31	0.02	0.09	0.03	0.01	0.00	0.03	符合正态分布
水稻籽实	29	0.02	0.07	0.04	0.01	0.00	0.03	符合正态分布

土壤类型	样品数/个	黏土含量/%	有机质含量/%	pH	S含量/ 10^-6	Al₂O₃ 含量/%	P含量/ 10^-6	TFe₂O₃ 含量/%	Mn含量/ 10^-6	N含量/ 10^-6	Se含量/ 10^-6
黄壤	15	29.73±9.48	5.20±4.65	6.05±1.09	1 294±1 406	13.71±1.82	778±284	6.12±2.14	562±300	1 915±817	0.78±0.59
石灰土	6	22.46±6.07	5.57±4.26	5.18±1.00	2 433±4 879	15.62±2.16	1 082±451	9.27±3.79	713±519	2 049±902	1.06±0.78
水稻土	6	29.58±7.58	2.14±0.57	5.70±1.19	512±325	15.50±0.41	513±135	5.88±0.29	516±142	1 179±303	0.27±0.07
紫色土	33	27.90±7.61	2.08±0.71	5.60±0.90	378±197	15.08±1.42	563±178	5.25±0.99	481±193	1 228±386	0.28±0.09
全部样品	60	27.98±8.05	3.21±3.06	5.68±0.99	826±1720	14.84±1.66	664±290	5.93±2.06	528±267	1 477±665	0.48±0.47