Arsenic Input Flux in Farmland Soil of 9 Counties in the Middle East of Guangxi

doi:10.19657/j.geoscience.1000-8527.2019.03.06

Abstract

Abstract:

The input fluxes of As in farmland soil of 9 counties in the middle east of Guangxi were studied.By integrating various factors, the authors took the atmospheric wet and dry depositions, fertilizers and irrigation water as As inputs.Calculation results show that the atmospheric wet and dry depositions and the fertilizers fluxes are about the same, which of the average fluxes are 9.92 g/(hm²·a) and 7.83 g/(hm²·a), while the irrigation water flux is much higher,which of the average flux is 14.98/g/(hm²·a).They contribute 30.31%, 23.92% and 45.77% of As in soil respectively. Their proportions are somewhat different among 9 counties of the study area.The irrigation and fertilizers in 6 counties are dominant, and the proportion of atmospheric wet and dry depositions is higher in the other 3 counties.Therefore, the irrigations is the main input way of As in the study area.Adequate attention should be paid to the water quality controlling.Ignoring the outputs, it is estimated that the As content in farmland soil may increase by 0.01 mg/kg due to the present average flux of arsenic.The proportion of annual As increment in farmland soil is very small, so outside-sourced As will cause little change in As distribution in soil in a short time.The soil of the study area has low pH value and high iron oxides content, so the bioavailability of As is low when it is imported into farmland soil.

Key words: input flux, As, farmland soil, Guangxi

CLC Number:

P595
X142

CHEN Xue, YANG Zhongfang, CHEN Yuelong, YANG Qiong, WANG Lei, WEI Xueji. Arsenic Input Flux in Farmland Soil of 9 Counties in the Middle East of Guangxi[J]. Geoscience, 2019, 33(03): 525-534.

Figures/Tables 13

Fig.1 Sampling locations of 3 outside-sources in the study area

Fig.2 The average As deposition flux in various counties of the study area

Fig.3 Atmospheric deposition input flux in the study area compared with those from other regions

Table 1 As concentration in different fertilizer species in the study area(μg/g)

化肥种类	样品数	平均值	最大值	最小值
复合肥	125	16.00	141	0.01
氮肥	35	5.23	128	0.00
磷肥	10	88.80	439	1.94
钾肥	26	0.80	7.30	0.02
有机肥	12	5.42	18.50	0.07

Fig.4 The average As concentrations in different fertilizer species in various counties of the study area

Fig.5 The average As fertilizer flux in various counties of the study area

Fig.6 Fertilizer input flux in the study area compared with those from other regions

Fig.7 The average As irrigation water flux in various counties of the study area

Fig.8 Irrigation water input flux in the study area compared with those from other regions

Fig.9 The average As input flux in various counties of the study area

Fig.10 Contributions of different input types to total inputs of As in various counties of the study area

Fig.11 Input flux in the study area compared with those from other regions

Table 2 Increment of the As concentration of soil caused by the As flux for various counties of the study area

地区	博白	北流	兴业	港南	平南	兴宾	象州	鹿寨	临桂	平均值
土壤As年增量/(mg/kg)	0.01	0.01	0.02	0.02	0.01	0.01	0.01	0.01	0.01	0.01

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