牧草更新期间全翻转耕作对土壤和植物镉浓度的影响:以新西兰为例

IF 1.2 4区农林科学 Q4 SOIL SCIENCE

Soil Research Pub Date : 2022-12-05 DOI:10.1071/sr22193

Yajun Peng, James A. Hanly, Paramsothy Jeyakumar, Roberto Calvelo-Pereira

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引用次数: 0

摘要

背景:镉(Cd)的积累是永久性牧场土壤的一个问题，因为它会导致植物对Cd的吸收增加。目的:本研究旨在量化在牧草更新过程中使用的完全翻转耕作(FIT或耕作深度超过30 cm)对土壤剖面中Cd再分配和植物Cd浓度的影响。方法:两次现场试验(试验1:Alfisol;试验2 (Andisol)在新西兰建立，采用对比耕作方法(FIT;浅耕;和NT(免耕)播种芜菁作为夏季饲料作物，然后秋季重新播种多年生黑麦草/白三叶牧场。关键结果:在Alfisol中，没有可测量的差异(P >不同耕作方式土壤和植物Cd含量差异均达0.05)。在andiol组，FIT降低(P <0 ~ 5 cm深度土壤可提取Cd (0.013 mg/kg)，分别高于耕作前(0.42和0.031 mg/kg)。此外，在该土壤深度，FIT处理的可提取土壤Cd浓度比ST处理低52% (P = 0.034)。此外，与ST相比，FIT后新牧场Cd平均浓度(0.03 mg/kg vs 0.05 mg/kg)较低(P = 0.007)。结论:我们证明了在草场更新过程中使用FIT是降低表层土壤Cd浓度的潜在解决方案。结论:FIT在土壤总镉浓度或随深度垂直分层程度较高的土壤中更为有效。

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Effects of full inversion tillage during pasture renewal on soil and plant cadmium concentrations: a case study in New Zealand

Context: Cadmium (Cd) accumulation is a concern in permanent pasture soils, as it can lead to increased Cd uptake by plants.

Aims: This study aimed to quantify the effect of full inversion tillage (FIT or ploughing deeper than 30 cm), used during pasture renewal, on the redistribution of Cd within the soil profile and on plant Cd concentration.

Methods: Two field trials (Trial 1, Alfisol; Trial 2, Andisol) were established in New Zealand using contrasting tillage practices (FIT; SIT, shallow tillage; and NT, no tillage) to sow turnips as summer forage crops, followed by autumn re-sowing of perennial ryegrass/white clover pasture.

Key results: In the Alfisol, no measurable differences (P > 0.05) in soil and plant Cd were detected among the tillage treatments. In the Andisol, FIT decreased (P < 0.05) total (0.25 mg/kg) and extractable soil Cd (0.013 mg/kg) in the 0–5 cm depth, compared to pre-tillage (0.42 and 0.031 mg/kg, respectively). Moreover, at this soil depth, FIT achieved a 52% lower (P = 0.034) extractable soil Cd concentration than the ST treatment. In addition, the subsequent new pasture had lower (P = 0.007) average Cd concentration following FIT compared to ST (0.03 vs 0.05 mg/kg).

Conclusions: We demonstrated that the use of FIT during pasture renewal is a potential solution to reduce topsoil Cd concentration.

Implications: The FIT is more effective in soil where total soil Cd concentration or its degree of vertical stratification with depth is relatively high.

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来源期刊

Soil Research SOIL SCIENCE-

CiteScore

3.20

自引率

6.20%

发文量

审稿时长

4.5 months

期刊介绍： Soil Research (formerly known as Australian Journal of Soil Research) is an international journal that aims to rapidly publish high-quality, novel research about fundamental and applied aspects of soil science. As well as publishing in traditional aspects of soil biology, soil physics and soil chemistry across terrestrial ecosystems, the journal welcomes manuscripts dealing with wider interactions of soils with the environment. Soil Research is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.