文献类型： 外文期刊

作者： Yang, Xiaomin ¹ ; Song, Zhaoliang ² ; Guo, Laodong ⁴ ; Wang, Jingxu ⁵ ; Ni, Yilun ¹ ; Li, Zimin ⁶ ; Hao, Qian ² ; Li, Qiang ² ; Wu, Lele ² ; Kuang, Wei ⁷ ; Liu, Yang ⁷ ; Ran, Xiangbin ⁸ ; Singh, Bhupinder Pal ⁹ ; Hartley, Iain P. ¹⁰ ; Wang, Hailong ¹¹ ;

作者机构： 1.Guizhou Univ, Coll Resources & Environm Engn, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang 550025, Peoples R China

2.Tianjin Univ, Sch Earth Syst Sci, Inst Surface Earth Syst Sci, Tianjin Key Lab Earth Crit Zone Sci & Sustainable, Tianjin 300072, Peoples R China

3.Minist Educ, Guizhou Karst Environm Ecosyst Observat & Res Stn, Guiyang 550025, Peoples R China

4.Univ Wisconsin, Sch Freshwater Sci, 600 East Greenfield Ave, Milwaukee, WI 53204 USA

5.Henan Acad Sci, Inst Geog, Zhengzhou 450052, Peoples R China

6.Univ Catholique Louvain UCLouvain, Earth & Life Inst, Soil Sci & Environm Geochem, Croix Sud 2-L7-05-10, B-1348 Louvain La Neuve, Belgium

7.Hunan Rice Res Inst, Changsha 410125, Peoples R China

8.Minist Nat Resources, Inst Oceanog 1, Res Ctr Marine Ecol, 6 Xianxialing Rd, Qingdao 266061, Peoples R China

9.Univ New England, Sch Environm & Rural Sci, Armidale, NSW 2351, Australia

10.Univ Exeter, Coll Life & Environm Sci, Rennes Dr, Exeter EX4 4RJ, Devon, England

11.Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China

12.Zhejiang A&F Univ, Sch Environm & Resource Sci, Hangzhou 311300, Zhejiang, Peoples R China

关键词： Silicon; Rice straw; Biogeochemical carbon sequestration; Silica biomineralization; Climate change; Rice paddy

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2023 年 856 卷

页码：

收录情况： SCI

摘要： Phytoliths are silica biomineralization products within plants and have been considered as a promising material to sequester carbon (C). However, there is considerable uncertainty and controversy regarding the C content in phytoliths due to the lack of detailed information on variation of C under different extraction procedures. Herein, we established a series of batch digestion experimental procedures coupled with analyses of phytoliths using Scanning Electron Microscopy and Energy-Dispersive X-ray Spectroscopy to divide phytoliths into three fractions. We then reported an approach for standardizing across hundreds of values found in the literature. Combining this standardized approach with C contents in phytoliths extracted from different digestion degrees, we revaluated the potential production rates of phytolith-occluded carbon (PhytOC) input globally in rice paddy fields. The results showed that the C content in recovered phytoliths exhibited a significantly fitting exponential relationship (p < 0.01) with digestion degrees and decreased from 30 to 75 g kg-1 under moderate digestion to <5 g kg-1 under over digestion. On a global scale, the production of total PhytOC in the world paddy fields reached up to (2.71 +/- 0.85) x 106 t year-1. Therein, the contribution of sub-stable PhytOC fraction, stable PhytOC fraction, and recalcitrant PhytOC fraction was 63 %, 28 %, and 9 %, respectively. Our results imply that the estimation of phytolith C sequestration potential across the global paddy fields is associated with specific PhytOC fractions. Therefore, further determining the storage time limits of these specific PhytOC fractions after returning to soil will be vital for predicting terrestrial biogeochemical C sequestration potentials of phytoliths.