Studying Agricultural Intensification and Sustainability in PR China

Paoletti, Maurizio G.; Giampietro, Mario; Chunru, Han; Pastore, Gianni; Bukkens, Sandra G.F.

doi:10.1080/07352689991309360

Cited by 6 publications

(3 citation statements)

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“…Ten years ago, in another special issue of Critical Review in Plant Science dedicated to the sustainability of agriculture (Paoletti et al, 1999), one of the papers was dedicated to an international comparison of the use of fossil energy in agriculture . The goal was to study the different mixes of technical inputs used in different typologies of countries, over a significant sample of world countries.…”

Section: Introductionmentioning

confidence: 99%

Food Security and Fossil Energy Dependence: An International Comparison of the Use of Fossil Energy in Agriculture (1991-2003)

Arizpe

Giampietro

Ramos-Martín

2011

Critical Reviews in Plant Sciences

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Section: Introductionmentioning

confidence: 99%

Food Security and Fossil Energy Dependence: An International Comparison of the Use of Fossil Energy in Agriculture (1991-2003)

Arizpe

Giampietro

Ramos-Martín

2011

Critical Reviews in Plant Sciences

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“…During the past few decades, agricultural cultivation in this area has intensified in response to a steady increase in population and the relative scarcity of land [23]. Increased agricultural activity involves the intensive use of fertilizers, which contain heavy metals such as As, Cd, Hg, Ni, Pb and Zn; therefore, the continuous application of fertilizers and soil amendments can exacerbate the accumulation of heavy metals in agricultural regions [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Heavy metal sources and associated risk in response to agricultural intensification in the estuarine sediments of Chaohu Lake Valley, East China

Tang

Shan

Zhang

et al. 2010

Journal of Hazardous Materials

205

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a b s t r a c tIn this study, the source and risk associated with heavy metals in the estuarine sediments of Chaohu Lake Valley in East China were studied. The results demonstrated that most metal contents (Cd, Pb and Zn) increased continuously from 0.21, 8.05 and 73.76 mg/kg in the substrate to 0.33, 17.20 and 100.22 mg/kg in the surface sediments on average, respectively, in all ten estuaries evaluated. In addition, the high proportion of chemically reactive forms of Cd (18.10-33.60%) implied a moderately high risk, while the risk associated with Pb and Zn was moderate in most estuaries. Enrichment factor (EF) and cluster analysis (CA) were conducted to assess the metal sources. The EF values of Cd, Pb and Zn (4.96, 3.68 and 2.25, respectively) indicated that they had accumulated in the estuarine sediments. Additionally, CA suggested that their primary sources were anthropogenic, namely the extensive use of fertilizers. Therefore, heavy metal pollution due to agricultural intensification in Chaohu Lake Valley should be taken into account during the formation of valley management strategies for the water environment.

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“…Chaohu Lake is a typical, large, shallow, subtropical freshwater lake that covers an area of 780 km 2 and has a mean water depth of 2.69 m. The valley in which the lake is located has a traditional agriculturalbased economy and a centuries-old history of cultivation [21,22]. In the last few decades, agricultural cultivation in the valley has increased in response to a steady increase in population and relative scarcity of land [23]. Consequently, non-point source pollution has increased and Chaohu Lake has become as one of the three most polluted freshwater lakes in China [24,25].…”

Section: Study Areamentioning

confidence: 99%

Phosphorus Buildup and Release Risk Associated with Agricultural Intensification in the Estuarine Sediments of Chaohu Lake Valley, Eastern China

Shan

Zhang

2010

CLEAN Soil Air Water

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Phosphorus (P) accumulation and the risk of P release were studied in the estuarine sediments of the Chaohu Lake Valley in Eastern China. Rapid agricultural intensification has occurred in this area since the 1980s, resulting in the extensive use of phosphate fertilizers. This extensive use of phosphate has affected P processes throughout the valley and resulted in the total phosphorus (TP) contents in the substrates and surface sediments increasing from 374 to 537 mg/kg, on average. Of all the forms of P evaluated in this study, residual P (Res-P) was present at the highest levels and accounted for 19.8 -74.0% of the TP. Conversely, the lowest contents were observed for KCl-extracted P (KCl-P), which accounted for only 0.602% of the TP. Additionally, aluminum/iron-bound P (NaOH-Pi), which accounted for 16.0 -53.1% of the TP, was an important factor that caused the TP to increase due to long-term P fertilization. However, calcium-bound P (Ca-P) was maintained at a relatively stable level. Furthermore, the degree of P saturation (DPS) and the P-induced lake eutrophication risk index (ERI) were investigated to determine the risk of release of P from the sediments. The average DPS and ERI values were found to range from 3.92 -21.4% and from 12.6 -33.6%, respectively. These results suggest that almost half of the estuarine sediments posed a potential risk of eutrophication. Moreover, these findings indicate that estuarine sediments that have been enriched with P are likely the sources of P that lead to the formation of algal blooms in Chaohu Lake.

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Studying Agricultural Intensification and Sustainability in PR China

Cited by 6 publications

References 0 publications

Food Security and Fossil Energy Dependence: An International Comparison of the Use of Fossil Energy in Agriculture (1991-2003)

Food Security and Fossil Energy Dependence: An International Comparison of the Use of Fossil Energy in Agriculture (1991-2003)

Heavy metal sources and associated risk in response to agricultural intensification in the estuarine sediments of Chaohu Lake Valley, East China

Phosphorus Buildup and Release Risk Associated with Agricultural Intensification in the Estuarine Sediments of Chaohu Lake Valley, Eastern China

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