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Tao, Fulu; Zhu, Feng

doi:10.1023/a:1005139719658

Cited by 26 publications

(3 citation statements)

References 6 publications

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“…2. Soils in the coastal provinces of Zhejiang, Fujian, Guangdong, and Guangxi could reach N-saturation conditions faster than in other regions of the world, as they have been identified as especially sensitive due to their small buffering capacity and slow mineral weathering rates (Smith 1990;Tao and Feng 2000). Our simulations show that under the high levels of N deposition already reported in southeastern China, some Chinese fir plantations could leach out important amounts of N in just one or two rotations (20 to 40 years).…”

Section: Effects Of Atmospheric Pollution On Biomass Productionmentioning

confidence: 99%

Impacts of enhanced nitrogen deposition and soil acidification on biomass production and nitrogen leaching in Chinese fir plantations

et al. 2012

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Atmospheric pollution levels in China are increasing quickly. Experience from other polluted regions shows that tree growth could be affected, but long-term effects of N deposition and soil acidification on Chinese forests remain mostly unknown. Soil acidification and N deposition were simulated for Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) plantations managed for three consecutive 20-year rotations in southeastern China. A factorial experiment combined four rain pH levels (2.5, 4.0, 5.6, and 7.0), four N deposition rates (1, 7.5, 15, and 30 kg N·ha -1 ·year -1 ), and two site qualities (poor and rich). Results indicate that atmospheric pollution effects are not immediate, but after one to two rotations, soil acidification effects could reduce ecosystem C pools significantly (-25% and -11% in poor and rich sites, respectively). N deposition rates above 15 kg N·ha -1 ·year -1 could offset some of the negative effects of soil acidification and lead to more ecosystem C (19 and 28 Mg C·ha -1 more in poor and rich sites, respectively, than in low N deposition). However, at high N deposition rates (>15 kg N·ha -1 ·year -1 ), N leaching losses could greatly increase, reaching 75 kg N·ha -1 ·year -1 . Moderate N deposition could increase tree biomass production and soil organic mass, resulting in increased ecosystem C, but these gains could be associated with important N leaching. Atmospheric pollution could also result in the long term in nutrient imbalances and additional ecological issues (i.e., biodiversity loss, eutrophication, etc.) not studied here.Résumé : Les niveaux de pollution atmosphérique augmentent rapidement en Chine. L'expérience d'autres régions aux prises avec la pollution montre que la croissance des arbres pourrait être ralentie mais les effets à long terme des dépôts azotés (N) et de l'acidification des sols dans les forêts chinoises sont pratiquement inconnus. L'acidification du sol et les dépôts de N ont été simulés dans des plantations de sapin de Chine (Cunninghamia lanceolata (Lamb.) Hook.) aménagées pendant trois rotations consécutives d'une durée de 20 ans dans le sud-est de la Chine. Une expérience factorielle a combiné quatre niveaux de pluie acide (pH 2,5, 4,0, 5,6 et 7,0), quatre taux de déposition de N (1, 7,5, 15 et 30 kg N·ha -1 ·an -1 ) et deux qualités de station (pauvre et riche). Les résultats montrent que les effets de la pollution atmosphérique ne sont pas immé-diats, mais qu'après une à deux rotations, les effets de l'acidification du sol pouvaient réduire de façon significative les ré-serves de carbone (C) de l'écosystème (-25 et -11 % respectivement dans les stations pauvres et riches). Les taux de déposition de N plus élevés que 15 kg N·ha -1 ·an -1 pouvaient atténuer certains des effets négatifs de l'acidification du sol et ont mené à plus de C de l'écosystème (19 et 28 Mg C·ha -1 de plus respectivement dans les stations pauvres et riches qu'avec un faible taux de déposition de N). Cependant, les pertes de N par lessivage pouvaient augmenter de façon importante, ju...

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Section: Effects Of Atmospheric Pollution On Biomass Productionmentioning

confidence: 99%

Impacts of enhanced nitrogen deposition and soil acidification on biomass production and nitrogen leaching in Chinese fir plantations

et al. 2012

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“…22 The PRD region is located in a subtropical area in which the soils (classied as v-c soils) contain less Si and abundant Fe/Al due to active desilicication and allitization. 23,24 During September-November 2011, 43 pairs of soil and vegetable samples were collected from agricultural land and large vegetable farms in the PRD region (Fig. 1).…”

Section: Study Area and Sampling Strategymentioning

confidence: 99%

Heavy metal accumulation in balsam pear and cowpea related to the geochemical factors of variable-charge soils in the Pearl River Delta, South China

Chang

Liu

et al. 2014

Environ. Sci.: Processes Impacts

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Variable-charge (v-c) soils in subtropical areas contain considerable amounts of iron/aluminum (Fe/Al) oxides that can strongly influence the fate of heavy metals in agricultural ecosystems. However, the relationship between heavy metal accumulation in vegetables and the geochemical factors associated with v-c soils in subtropical regions remains unknown. The present study investigated heavy metal accumulation under field conditions in the Pearl River Delta (PRD) by measuring the content of 8 heavy metals (zinc (Zn), arsenic (As), copper (Cu), mercury (Hg), lead (Pb), chromium (Cr), nickel (Ni) and cadmium (Cd)) in 43 pairs of v-c soil and vegetable (balsam pear and cowpea) samples. Soil physicochemical properties including pH, texture, organic matter and oxide minerals (Fe2O3, SiO2, Al2O3, CaO, MgO, K2O and Na2O) were also analyzed. Heavy metal accumulation from soil to vegetables was assessed based on bioconcentration factors (BCFs). The results showed that soil extractable Fe, oxide minerals and chemical weathering indices of v-c soils strongly affected heavy metal accumulation, whereas the content of Zn, Cu, Cr and Ni in vegetables was strongly affected by the soil clay content. Significant correlations were found between the BCFs of heavy metals and oxide minerals. However, no significant relationship was found between pH and heavy metal accumulation (except for Cu) in balsam pear and cowpea. Correlation analyses showed that a lower oxalate/DCB- extractable Fe content might indicate greater heavy metal (Zn, Cu, Hg, Cr and Ni) accumulation in vegetables. Therefore, it can be deduced that oxalate/DCB- extractable Fe content is a critical geochemical factor that determines the bioavailability of heavy metals and that iron biogeochemical cycles play vital roles in the fate of heavy metals in vegetable fields in this area. These findings provide new insights into the behaviors and fate of heavy metals in subtropical v-c soils and can be used to develop possible guidelines for vegetable safety management.

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“…Th e characteristics and status quo of the coal-dominated energy structure in Guizhou, which are determined by the characteristics of its resources and level of economic development, combined with the characteristics of its meteorology and topography have caused an extremely high level of acid deposition pollution in this province, which has been a typical "acid rain control zone" in China (Li and Gao, 2002). Th in soil and a poor ability for soil formation have made this area in southwest China a vulnerable ecological area (Tao and Feng, 2000). Nevertheless, forests distributed across this region play an important role in maintaining hydroecological functions.…”

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confidence: 99%

Estimating Chemical Exchange between Atmospheric Deposition and Forest Canopy in Guizhou, China

Gao

Liao

2013

J. Environ. Qual.

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To evaluate the effects of atmospheric deposition on forest ecosystems, wet-only precipitation and throughfall samples were collected in two forest types (Masson pine [ Lamb.] forests and mixed conifer and broadleaf forests) in the Longli forest in the Guizhou province of southwestern China for a period of 21 successive months from April 2007 to December 2008. The pH and chemical components of precipitation and throughfall were analyzed. In addition, the canopy budget model was applied to distinguish between in-canopy and atmospheric sources of chemical compounds. Canopy leaching and total potentially acidifying deposition fluxes were calculated. The results showed that the average pH and the concentration of ions in throughfall were higher than those in precipitation, with the exception of the NH concentration. Dry deposition of S and N accumulated more in Masson pine forests than in mixed conifer and broadleaf forests. Canopy leaching was the most significant source of base cations in forest throughfall, which was higher in the mixed forests than in the coniferous forests. Anions in throughfall deposition in Masson pine forests exceeded those in the mixed forests. Higher total potentially acidifying deposition fluxes reflected the more effective amounts of acid delivered to Masson pine forests compared with mixed conifer and broadleaf forests. In addition, acid deposition induced the leaching and loss of nutrient ions such as Mg, K, and Ca. Although the trees of the studied areas have not shown any symptoms of cation loss, a potentially harmful influence was engendered by atmospheric deposition in the two forest types in the Longli area.

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Cited by 26 publications

References 6 publications

Impacts of enhanced nitrogen deposition and soil acidification on biomass production and nitrogen leaching in Chinese fir plantations

Impacts of enhanced nitrogen deposition and soil acidification on biomass production and nitrogen leaching in Chinese fir plantations

Heavy metal accumulation in balsam pear and cowpea related to the geochemical factors of variable-charge soils in the Pearl River Delta, South China

Estimating Chemical Exchange between Atmospheric Deposition and Forest Canopy in Guizhou, China

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