Advances in Phytolith-Occluded Organic Carbon in Grassland Ecosystems
Phytolith-occluded organic carbon(PhytOC),which is a part of the organic carbon encapsu-lated during the silicification process in grassland plants,constitutes an important component of the grass-land carbon sink.The sequestration of PhytOC is important for maintaining the dynamic balance of the car-bon cycle within grassland ecosystems.However,the sequestration of PhytOC in grassland ecosystems has not received enough attention and remains insufficiently studied.In this study,we reviewed the current research progress on terrestrial ecosystem PhytOC,analyzed the formation and sequestration of plant PhytOC,the accumulation and stability of soil PhytOC,and the distribution and storage of PhytOC across different grassland types.We also discussed the impacts of human activities and global climate change on grassland PhytOC.Furthermore,the future research directions for PhytOC in grassland ecosystems were also pro-posed.An in-depth study of PhytOC in grassland ecosystems can provide a theoretical basis for accurately estimating the carbon sequestration potential of phytolith under the background of global climate change,and this could further enhance the carbon cycle model of ecosystems.
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