Phytolith is widely known as a silica structure in numerous silicon (Si) accumulator plants, e.g., rice, and it contains various nutrients and other beneficial elements. When rice straw is returned to paddy fields, the silica structure of phytolith can be dissolved, thereby releasing its occluded nutrients. While the intrinsic characteristics and dissolution properties of phytoliths under the effect of solution chemistry have been intensively studied, the effect of gas phases, especially CO₂, on phytolith stability and the implications for nutrient release are not fully known. Here, dissolution properties of phytolith ashes obtained from dry ashing of rice straw at 400, 600 and 800 °C were investigated by quantifying Si release together with other nutrients under two atmospheric conditions, i.e., without and with CO₂ support (aeration). In a time span of 6 days, the releases of nutrients (K, P, Ca, Mg) showed high dependence on the overall dissolution of the phytolith ashes. CO₂ significantly reduced the dissolution rate of the phytolith ashes but increased the release rates of cationic as well as anionic nutrients. The aeration of CO₂ shifted the carbonate equilibrium (H₂CO₃, HCO₃⁻ and CO₃²⁻) towards H₂CO₃, reducing solution pH, thereby decreasing the dissolution rate of phytoliths. Following this, intensification of H⁺ exchange promoted nutrient releases from the phytolith ashes. This indicates contrasted responses of phytoliths and their occluded nutrients to CO₂, and provides a better insight on the fate of soil phytoliths and the tendency of nutrient budgets from rice straw phytoliths in soils.

植硅体在许多硅 (Si) 蓄积植物（例如水稻）中被广泛称为二氧化硅结构，它含有各种营养物质和其他有益元素。当稻草返回稻田时，植硅体的二氧化硅结构会被溶解，从而释放出其封闭的养分。虽然已经深入研究了在溶液化学作用下植硅体的内在特性和溶解性质，但气相特别是 CO _2的影响，关于植硅体稳定性和对养分释放的影响尚不完全清楚。_{在这里，通过在两种大气条件下，即在没有和有 CO 2}支持（曝气）的情况下量化 Si 和其他营养物质的释放，研究了在 400、600 和 800 °C 下稻草干灰化获得的植硅体灰分的溶解特性。在 6 天的时间跨度内，养分（K、P、Ca、Mg）的释放高度依赖于植硅体灰烬的整体溶解。CO ₂显着降低了植硅体灰的溶解速率，但增加了阳离子和阴离子营养物质的释放速率。_{CO 2}的曝气改变了碳酸盐平衡（H ₂ CO ₃，HCO ₃^-和 CO ₃ ^2- ) 朝向 H ₂ CO ₃，降低溶液的 pH 值，从而降低植硅体的溶解速率。^{在此之后，H +}交换的强化促进了植硅体灰烬中的养分释放。这表明植硅体及其吸收的养分对 CO ₂的不同反应，并提供了对土壤植硅体的命运和土壤中稻草植硅体养分收支趋势的更好理解。