Analysis of Cadmium Balance Source in Soil-rice System in a Certain Area of Xiangxiang City

TANG Shengshuang; JIANG Kai; HUANG Jing; QIN Jianjun; LONG Jian; HOU Hongbo; PENG Peiqin

doi:10.13870/j.cnki.stbcxb.2020.02.052

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Analysis of Cadmium Balance Source in Soil-rice System in a Certain Area of Xiangxiang City

更新时间：2025-03-12

- Analysis of Cadmium Balance Source in Soil-rice System in a Certain Area of Xiangxiang City
- Vol. 34, Issue 2, Pages: 365-371(2020)
- 作者机构：
  
  中南林业科技大学环境科学与工程学院,长沙,410004
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.02.052
  CLC： X53;S511
- Published：2020
- 稿件说明：
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TANG Shengshuang, JIANG Kai, HUANG Jing, et al. Analysis of Cadmium Balance Source in Soil-rice System in a Certain Area of Xiangxiang City[J]. 2020, 34(2): 365-371.
DOI：

TANG Shengshuang, JIANG Kai, HUANG Jing, et al. Analysis of Cadmium Balance Source in Soil-rice System in a Certain Area of Xiangxiang City[J]. 2020, 34(2): 365-371. DOI： 10.13870/j.cnki.stbcxb.2020.02.052.

摘要

为探明我国南方典型稻田土壤Cd的输入输出特征与变化规律，以湖南省湘乡市某地区稻田为目标，探讨了3种输入途径（肥料、灌溉水和大气沉降）和2种输出途径（地表径流和稻草离田）与土壤Cd含量之间的关联。结果表明：2017—2018年和2018—2019年间Cd的净通量分别为3.226，-1.246 g/（hm2·a），总变化量为+1.980 g/（hm2·a）。其中大气沉降是最主要的输入方式，2年间Cd输入通量分别为8.68，5.75 g/（hm2·a），平均贡献率高于94%；稻草离田是最主要的输出方式，2年间Cd输出通量分别为5.73，7.32 g/（hm2·a），平均贡献率高于97%。通过输入输出平衡分析，2年内土壤Cd含量呈现增加趋势。因此，有必要采取如稻草离田等农业管理措施以提高土壤的安全利用效率。研究结果可为该区域土壤Cd污染源阻控提供理论依据和方法参考。

Abstract

In order to ascertain the input and output characteristics and variation of Cadmium (Cd) in the typical paddy soils in southern China

this study took the certain rice fields of Xiangxiang City in Hunan Province as research targets to discuss the connection between three input pathways (fertilizer

irrigation water and atmospheric deposition) and two output pathways (surface runoff water and rice straw removal) and the Cd content of soil. The results showed that the net fluxes of Cd between 2017-2018 and 2018-2019 were 3.259 and -1.246 g/(hm2·a) respectively

and the total change of Cd in two years was 2.013 g/(hm2·a). Atmospheric deposition was the main input pathway. The net fluxes in two years were 8.68 and 5.75 g/(hm2·a) respectively and the average contribution rate was higher by 94%. Rice straw was the main output pathway. The net fluxes in the two years were 5.73 and 7.32 g/(hm2·a) respectively

and the average contribution rate was higher by 97%. Through the input-output equilibrium analysis

the soil Cd content showed an increasing trend within two years. Therefore

it was necessary to adopt agricultural management measures such as "straw out from field" to improve the safe use efficiency of the soil. The research results could provide theoretical basis and method for the prevention and control of soil Cd pollution sources in this region.

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