Soil acidification suppresses phosphorus supply through enhancing organomineral association

被引:4
作者
Hu, Yuanliu [1 ,2 ,3 ,5 ]
Chen, Ji [4 ,5 ]
Hui, Dafeng [6 ]
Li, Jianling [1 ,2 ]
Yao, Xianyu [1 ,2 ]
Zhang, Deqiang [1 ,2 ]
Deng, Qi [1 ,2 ,7 ]
机构
[1] Chinese Acad Sci, South China Bot Garden, Guangdong Prov Key Lab Appl Bot, Key Lab Vegetat Restorat & Management Degraded Eco, Guangzhou 510650, Guangdong, Peoples R China
[2] South China Natl Bot Garden, Guangzhou 510650, Guangdong, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100039, Peoples R China
[4] Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Peoples R China
[5] Aarhus Univ, Dept Agroecol, DK-8830 Tjele, Denmark
[6] Tennessee State Univ, Dept Biol Sci, Nashville, TN 37209 USA
[7] Chinese Acad Sci, South China Bot Garden, 723 Xingke Rd, Guangzhou 510650, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
Acid rain; Weathered soils; Phosphorus fractions; Competitive sorption; Mineral-associated carbon; ORGANIC-MATTER; PHOSPHATE ADSORPTION; SORPTION; FOREST; ACID; MECHANISMS; DESORPTION; DEPOSITION; GOETHITE; ALUMINUM;
D O I
10.1016/j.scitotenv.2023.167105
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
It has long been assumed that soil acidification increases reactive iron and/or aluminum (Fe/Al) oxides and promotes Pi sorption onto mineral surfaces, resulting in a decrease in Pi. However, this assumption has seldom been tested in long-term field experiments. Using a 12-year acid addition experiment in a tropical forest, we demonstrated that soil acidification increased the content of noncrystalline Fe and Al oxides by 16.3 % and 27.7 %, respectively; whereas it did not alter the absorbed Pi pool and Pi sorption capacity. Furthermore, soil acidification increased the Fe/Al-bound organic matter content by 82.5 %, causing a 54.9 % reduction in Pi desorption, a 42.3 % decrease in soluble Pi content, and a 9.2 % increase in occluded Pi content. Our findings demonstrate that soil acidification reduces Pi bioavailability by repressing Pi desorption rather than enhancing Pi sorption. These results could be attributed to the enhanced organomineral association, which competes for sorption sites with Pi and promotes the Pi occlusion. However, the interactions between organomineral-Pi have not been incorporated into global land models, which may overestimate ecosystem productivity under future acid rain scenarios.
引用
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页数:9
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