文献类型：期刊文献

英文题名：Will elevated CO2 enhance mineral bioavailability in wetland ecosystems? Evidence from a rice ecosystem

作者：Guo, Jia[2,3] Zhang, Weijian[1,3] Zhang, Mingqian[3] Zhang, Li[3] Bian, Xinmin[3]

第一作者：Guo, Jia;郭嘉

通信作者：Zhang, WJ[1]

机构：[1]Chinese Acad Agr Sci, Inst Crop Sci, Key Lab Crop Ecol Physiol & Prod, Minist Agr, Beijing 100081, Peoples R China;[2]Chinese Acad Forestry, Inst Wetland Res, Beijing 100091, Peoples R China;[3]Nanjing Agr Univ, Inst Appl Ecol, Nanjing 210095, Jiangsu, Peoples R China

年份：2012

卷号：355

期号：1-2

起止页码：251-263

外文期刊名：PLANT AND SOIL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000304617000019)】；

基金：This work was funded by Ph.D. Program Foundation of Ministry of Education of China, New Century Excellent Talents Program, China (NCET-05-0492), National Science and Technology Ministry Support Program for the 12th Five-year Plan (2011BAD16B14). We are grateful to Dr. Hu Shuijin in the Department of Plant Pathology, North Carolina State University, and Dr. Zhu Jianguo and Dr. Xie Zhubin in the Institute of Soil Science, Chinese Academy of Sciences, for their constructive suggestions and helps to this research.

语种：英文

外文关键词：Agricultural wetlands; Climate change; Food security; Free air CO2 enrichment (FACE); Mineral cycling; Soil acidification

摘要：Mineral cycling plays a critical role in wetland ecosystem functions and can be affected by environmental changes, such as CO2 enrichment. Learning the responses of mineral bioavailability in wetlands to elevated CO2 under field conditions will provide enormous benefits to the assessment of climate change impacts on wetland ecosystems. A free-air CO2 enrichment (FACE) experiment was conducted in a rice ecosystem in Jiangsu, China, with two nitrogen (N) application levels. Responses of K, Ca, Mg, Fe, Mn, Zn, and Si in this ecosystem were investigated in situ. CO2 enrichment increased rice biomass Ca, Mg, Fe, Mn, Zn, and Si regardless of N application levels. Dissolved mineral contents in surface water and available mineral contents in the 0-15 cm soil layer were higher in the FACE plots than in the ambient under both N levels. Elevated CO2 reduced the pH values of the 0-15 cm soil layer and surface water, but increased the cation exchange capacity of the soil layer. The effects of N treatment and its interaction with CO2 enrichment were mostly insignificant on the above parameters. Our results indicate that CO2 enrichment can enhance mineral bioavailability in a rice ecosystem through accelerating mineral transformation from the bio-inactive reservoirs to the bioactive ones.