title: Effects of calcite and magnesite application to a declining Masson pine forest on strongly acidified soil in Southwestern China.
abstract: Liming of strongly acidified soil under a Masson pine (Pinus massoniana Lamb.) forest was studied through a seven-year field manipulation experiment at Tieshanping, Chongqing in Southwestern China. To distinguish between the individual effects of Ca(2+) and Mg(2+) addition, we separately applied calcite (CaCO3) and magnesite (MgCO3), rather than using dolomite [CaMg(CO3)2]. Both calcite and magnesite additions caused a significant increase in pH and a decrease in dissolved inorganic monomeric aluminium (Ali) concentration of soil water. Ecological recovery included increases of herb biomass (both treatments) and Mg content in Masson pine needles (magnesite treatment only). However, the growth rate of Masson pine did not increase under either treatment, possibly because of nutrient imbalance due to phosphorus (P) deficiency or limited observation period. In China, acid deposition in forest ecosystems commonly coincides with large inputs of atmogenic Ca(2+), both enhancing Mg(2+) leaching. Calcite addition may further decrease the Mg(2+) availability in soil water, thereby exacerbating Mg(2+) deficiency in the acidified forest soils of southern and southwestern China. The effect of anthropogenic acidification of naturally acid forest soils on P availability needs further study.
authors.affiliation: State Key Laboratory of Earth Surface and Resource Ecology, College of Resources Science and Technology, Beijing Normal University, Beijing 100875, PR China.
authors.forename: Yongmei
authors.initials: Y
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors.forename: Ronghua
authors.initials: R
authors.lastname: Kang
authors.affiliation: State Key Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors.forename: Xiaoxiao
authors.initials: X
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Earth Surface and Resource Ecology, College of Resources Science and Technology, Beijing Normal University, Beijing 100875, PR China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Qi
authors.affiliation: Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, Box 5003, NO-1432 Ås, Norway.
authors.forename: Jan
authors.initials: J
authors.lastname: Mulder
authors.affiliation: State Key Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China; Collaborative Innovation Centre for Regional Environmental Quality, Tsinghua University, Beijing 100084, China. Electronic address: lduan@tsinghua.edu.cn.
authors.forename: Lei
authors.initials: L
authors.lastname: Duan
mesh_terms: D015258:Acid Rain; D002119:Calcium Carbonate / Q000737:chemistry*; D002681:China; D004784:Environmental Monitoring; D052918:Environmental Restoration and Remediation / Q000379:methods*; D016468:Forestry / Q000379:methods; D006863:Hydrogen-Ion Concentration; D008274:Magnesium / Q000737:chemistry*; D010758:Phosphorus / Q000032:analysis; D028223:Pinus / Q000502:physiology*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*
chemical_list: D015258:Acid Rain; D012987:Soil; D012989:Soil Pollutants; C005479:magnesium carbonate; D010758:Phosphorus; D002119:Calcium Carbonate; D008274:Magnesium
keywords: Acidification; Calcite; Liming; Magnesite; Masson pine; Soil remediation