[Enrichment and Ecological Risk Assessment of Available Phosphorus in Paddy Soil of Fujian Province Over Past 40 years]

Zhong-Xing Chen; Long-Xia Qiu; Han-Yue Chen; Xie-Yu Fan; Ting Wu; Jing-Quan Shen; Shi-He Xing; Li-Ming Zhang

doi:10.13227/j.hjkx.202108140

[Enrichment and Ecological Risk Assessment of Available Phosphorus in Paddy Soil of Fujian Province Over Past 40 years]

Huan Jing Ke Xue. 2022 Jul 8;43(7):3741-3751. doi: 10.13227/j.hjkx.202108140.

[Article in Chinese]

Authors

Zhong-Xing Chen^{1

2}, Long-Xia Qiu^{1

2}, Han-Yue Chen^{1

2}, Xie-Yu Fan^{1

2}, Ting Wu^{1

2}, Jing-Quan Shen³, Shi-He Xing^{1

2}, Li-Ming Zhang^{1

2}

Affiliations

¹ College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
² University Key Laboratory of Soil Ecosystem Health and Regulation in Fujian, Fuzhou 350002, China.
³ Fujian Crop Land Construction and Soil and Fertilizer Station, Fuzhou 350003, China.

PMID: 35791557
DOI: 10.13227/j.hjkx.202108140

Abstract

The ecological risks such as water eutrophication caused by soil phosphorus loss have attracted extensive attention, and its dynamic changes and enrichment effects are the basis for formulating reasonable control measures. In this study, based on the paddy soils of 1.8×10⁶ hm² in Fujian province, the dynamic changes and ecological risks of available phosphorus in paddy soils over the past 40 years were analyzedusing a soil database of 1:50000. The soil database contained 1471, 215534, and 2895 paddy soil samples in different periods, respectively. The paddy soil samples were derived from the 1982 Second National Soil Census, the 2008 Ministry of Agriculture and Rural Areas Soil Testing and Formulated Fertilization Project and the 2018 Ministry of Agriculture, and the Rural Areas Arable Land Quality Monitoring Project, respectively. The results showed that from 1982 to 2018, the content of available phosphorus in paddy soils increased by 47 mg·kg^-1, and the enriched area reached 1.65×10⁶ hm², accounting for 91% of the total paddy soils in Fujian province. From 1982 to 2008, the available phosphorus content of paddy soils in Fujian province increased by 28 mg·kg^-1, with the enriched area reaching 1.47×10⁶ hm², accounting for 82% of the total paddy soils in Fujian province. From 2008 to 2018, the available phosphorus content of paddy soils in Fujian province increased by 19 mg·kg^-1, with the enriched area reaching 1.22×10⁶ hm², accounting for 69% of the total paddy soils in Fujian province. Further ecological risk assessment showed that from 2008 to 2018, the area of paddy soil with ecological phosphorus enrichment risk in the province gradually increased, mainly distributed in percogenic paddy soils and hydromorphic paddy soils with a slope of less than 2°. In the future, effective phosphorus fertilizer management measures should be formulated for different types of paddy soil to prevent the occurrence of environmental problems such as water eutrophication.

Keywords: 1:50000 soil database; available phosphorus; ecological risk; phosphorus enrichment; spatiotemporal variability.

MeSH terms

Oryza*
Phosphorus
Risk Assessment
Soil*
Water

Substances

Soil
Water
Phosphorus