Effects of Limestone and Conditioner on Reducing Soil Cd Extractability Under Field Conditions

WANG Jian; YANG Tingting; ZHU Youwei; NI Wuzhong

doi:10.13870/j.cnki.stbcxb.2021.04.046

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Effects of Limestone and Conditioner on Reducing Soil Cd Extractability Under Field Conditions

更新时间：2025-03-12

- Effects of Limestone and Conditioner on Reducing Soil Cd Extractability Under Field Conditions
- Vol. 35, Issue 4, Pages: 334-340(2021)
- 作者机构：
  
  1. 浙江大学环境与资源学院, 浙江省农业资源与环境重点实验室,杭州,310058
  2. 浙江省耕地质量与肥料管理总站,杭州,310020
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.04.046
  CLC： X53
- Published：2021
- 稿件说明：
移动端阅览
WANG Jian, YANG Tingting, ZHU Youwei, et al. Effects of Limestone and Conditioner on Reducing Soil Cd Extractability Under Field Conditions[J]. 2021, 35(4): 334-340.
DOI：

WANG Jian, YANG Tingting, ZHU Youwei, et al. Effects of Limestone and Conditioner on Reducing Soil Cd Extractability Under Field Conditions[J]. 2021, 35(4): 334-340. DOI： 10.13870/j.cnki.stbcxb.2021.04.046.

摘要

原位钝化是镉污染稻田土壤修复的主要方法之一，钝化剂的选择对修复效果十分关键。通过3个田间试验和示范区对比调查研究了施用石灰石及主要调理剂对稻田土壤镉的钝化效应，并提出有效的技术措施。结果表明，施用足量石灰石（≥3.75 t/hm2，试验Ⅰ）、钙镁磷肥（3.75 t/hm2，试验III）和生物质炭（9.00 t/hm2，试验II；7.50 t/hm2，试验III）、石灰（3.00 t/hm2，试验III）碱性调理剂均能显著提高土壤pH，降低土壤Cd提取率（P<0.05）；施用硅藻土（8.25 t/hm2）和羟基磷灰石（3.75 t/hm2）也能降低土壤Cd提取率。其中施用石灰石11.25 t/hm2能使Cd提取率降低21个百分点；施用硅藻土8.25 t/hm2（试验Ⅱ）、生物质炭9.00 t/hm2（试验Ⅱ）可以显著降低土壤Cd提取率（P<0.05），分别降低10，19个百分点。试验Ⅲ中与对照相比，施用石灰3.00 t/hm2、钙镁磷肥3.75 t/hm2、生物质炭7.50 t/hm2处理的土壤pH显著提高（P<0.05），石灰、钙镁磷肥、生物质炭、羟基磷灰石3.75 t/hm2处理的土壤Cd提取率显著降低（P<0.05）；同时发现，石灰处理土壤pH显著高于钙镁磷肥、生物质炭、羟基磷灰石3个处理，而土壤Cd提取率则显著小于后三者。对比调查的相关性分析结果表明，Cd提取率与土壤pH呈显著负相关，与土壤有效态Cd含量呈显著正相关（P<0.05）。聚类分析得出，可将不同调理剂对土壤镉的钝化效应分为5类，钝化效应较大的为石灰6.00，9.00 t/hm2和GSA-4 6.00，9.00 t/hm2，可优先用于实际的钝化修复，而钝化效应不显著的有海泡石4.50 t/hm2、沸石4.50 t/hm2、腐殖质4.50 t/hm2和羟基磷灰3.00 t/hm2，则不予以推荐。

Abstract

In-situ passivation is one of the important methods for the remediation of cadmium-contaminated paddy soil

and the selection of passivation agent is critical for efficient remediation. This paper studied the inactivation effect of cadmium in paddy soil by applying limestone and main conditioning agents with three field trials and comparative investigations in demonstration plots

and the effective technical measures was discussed. The results showed that sufficient amount of limestone (≥3.75 t/hm2

experiment I)

calcium-magnesium phosphate fertilizer (3.75 t/hm2

experiment III) and biomass charcoal (9.00 t/hm2

test II; 7.50 t/hm2

test III))

lime (3.00 t/hm2

test III) and other alkaline conditioners can significantly increase soil pH and reduce soil Cd extraction rate (P<0.05); application of diatomaceous earth (8.25 t/hm2) and hydroxyapatite stone (3.75 t/hm2) can also reduce the soil Cd extraction rate. Among them

the application of limestone 11.25 t/hm2 could reduce the Cd extraction rate by 21%; the application of diatomaceous earth 8.25 t/hm2 (experiment II) and biomass charcoal 9.00 t/hm2 (experiment II) could significantly reduce the soil Cd extraction rate (P<0.05) by 10% and 19% respectively; compared with the control in Experiment III

the pH of the soil treated with lime 3.00 t/hm2

calcium magnesium phosphate fertilizer 3.75 t/hm2

and biomass charcoal 7.50 t/hm2 increased significantly (P<0.05). The Cd extraction rate of soil treated with lime

calcium magnesium phosphate

biomass charcoal

and hydroxyapatite 3.75 t/hm2 was significantly reduced (P<0.05)

and it was found that the pH value of soil treated with lime was significantly higher than that of calcium magnesium phosphate fertilizer

biomass charcoal

hydroxyapatite

and other three treatments

while the soil Cd extraction rate was significantly less than the latter three. Correlation analysis results based on comparative investigations showed that the extraction rate of Cd was significantly negatively correlated with pH

and was significantly positively correlated with effective Cd content (P<0.05). The cluster analysis showed that the passivation effects of different conditioners on soil cadmium can be divided into five categories. The most passivation effects were lime 6.00

9.00 t/hm2 and GSA-4 6.00

9.00 t/hm2

which can be used first. For the actual passivation repair

the sepiolite 4.50 t/hm2

zeolite 4.50 t/hm2

humus 4.50 t/hm2

and hydroxyapatite 3.00 t/hm2 with insignificant effects are not recommended.

关键词

Keywords

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