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A modified critical...
A modified critical load assessment method of heavy metals in paddy soil at large scale
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Liang, Kongqiu (author)
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Zhong, Junwei (author)
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Zhao, Wanfu (author)
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Song, Yinxian (author)
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Chang, He (author)
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Zhang, Shitao (author)
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Chen, Zhong (author)
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Zhou, Weiwei (author)
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Ji, Junfeng (author)
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Ayoko, Godwin A. (author)
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Frost, Ray L. (author)
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- Belyazid, Salim, 1977- (author)
- Stockholms universitet,Institutionen för naturgeografi
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(creator_code:org_t)
- 2023
- 2023
- English.
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In: Journal of Cleaner Production. - 0959-6526 .- 1879-1786. ; 416
- Related links:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The environmental capacity of agro-ecosystem is the basis of sustainable development of agriculture, but this is hard to evaluate quantitatively due to complex input and output processes of heavy metals. Therefore, in this study, leaching of heavy metals based on PROFILE weathering model were integrated into the steady-state critical load (SSCL) of heavy metals. The results showed that the leaching rates of Hg, As, Cd, Cr, Pb, Cu and Zn in paddy soil were 0.08, 4.69, 0.22, 44.31, 18.13, 21.96 and 64.42 g/ha ‧a, respectively, while the leaching rates were significantly correlated with pH, CaO, TFe2O3 and Corg.. Atmospheric deposition was the main input source of heavy metals in agricultural soil, while rice plant uptake and leaching were the main output pathways. The spatial distribution of SSCL were mainly affected by the content of heavy metals in soil, Aw (specific area of soil mineral), and ρ (bulk density). Values of SSCL hardly changed after about 40 years (Hg≈0.02 kg/ha, As≈0.60 kg/ha, Cd≈0.07 kg/ha, Cr≈ 5.59 kg/ha, Pb≈3.55 kg/ha, Cu≈1.49 kg/ha and Zn≈4.45 kg/ha). However, the sensitivity analysis indicated that soil leaching had 24.30%-27.90% positive effects on SSCL model. Based on the relationship among leaching, pH, standard limit and SSCL of heavy metals, the standard limit could be appropriately raised to cope with the increased human activities on the premise of the ecological capacity. Thus, the SSCL model provides a new insight for the establishment of environment management in agricultural soils.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
- LANTBRUKSVETENSKAPER -- Annan lantbruksvetenskap -- Miljö- och naturvårdsvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Other Agricultural Sciences -- Environmental Sciences related to Agriculture and Land-use (hsv//eng)
Keyword
- Heavy metal
- Soil leaching
- PROFILE model
- Critical load
- Environmental carrying capacity
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Liang, Kongqiu
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Zhong, Junwei
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Zhao, Wanfu
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Song, Yinxian
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Chang, He
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Zhang, Shitao
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show more...
-
Chen, Zhong
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Zhou, Weiwei
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Ji, Junfeng
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Ayoko, Godwin A.
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Frost, Ray L.
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Belyazid, Salim, ...
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Environmental Sc ...
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- AGRICULTURAL SCIENCES
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AGRICULTURAL SCI ...
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and Other Agricultur ...
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and Environmental Sc ...
- Articles in the publication
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Journal of Clean ...
- By the university
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Stockholm University