【Objective】As phytolith features super tolerance to high temperature, oxidation and decomposition, the organic carbon occluded inside the phytolith shell may exist and accumulate in soils and sediments for thousands of years and is hence named as Phytolith occluded organic carbon (PhytOC), which is, therefore, regarded as an important soil organic carbon pool, and contributes significantly to the carbon sink in the soil and global CO₂ balance. Forest ecosystem is a mainstay of the terrestrial ecosystem. However, the area of forests on the globe is shrinking drastically today, while the area of bamboo groves is still on a rising trend. So, bamboo groves are a growing carbon sink and playing a critical role in carbon cycling in the terrestrial ecosystem. As Dendrocalamus latiflorus Munro grows very fast and features large volumes of biomass, well-developed root system and outstanding ecological functions, it is favored to be one of the bamboo species extensively cultivated in South China. Nanjing County is known as “Land of Dendrocalamus latiflorus Munro in China” and one of the largest Dendrocalamus latiflorus Munro cultivation region in Fujian Province. In this paper an attempt was made to explore characteristics of the spatial distribution of PhytOC in the soil under the bamboo groves, aiming at providing some scientific basis for assessing the pool of PhytOC in the bamboo ecosystems of China.【Method】A total of 100 tracts of Dendrocalamus latiflorus Munro groves in Nanjing County was selected as object for the study. Soils in different soil layers were sampled for extraction and isolation of PhytOC using the microwave digestion method and then the centrifuging-heavy liquid floatation extraction method. In order to extract fairly pure Phytolith, the floatation extraction process was performed twice, using heavy liquid, Zinc bromide,2.35 and 1.60 in specific gravity sequently to remove impurities. The isolated pure phytolith was put into an ventilated oven at 65℃ for 48 hours till they were fully dried and constant in weight. And then, the Phytolith was weighed after the samples cooled down in a vacuum dryer. The Alkali Dissolution Spectrophotometry method was applied to analysis of the PhytOC and then spatial variability of the PhytOC in the bamboo soil analyzed using the software of ArcGIS 10.0 and the Geostatistic method.【Result】Results show that average content of PhytOC in the soil varied from 0.30～0.75 g kg^-1with soil layer uanging from 80.38 to 87.46%, which indicates a moderate degree of variability. Geostatistical analysis reveals that PhytOC contents in the 10～30 cm, 60～100 cm and 0～100 cm soil layers fit exponential models; in tnder Dendrocalamus latiflorus Munro groves in Nanjing County, with variation coefficients rhe 0～10 cm soil layer fit the Gaussian model; and in the 30～60 cm soil layer fit spherical models. Nugget /Sill ratio of the PhytOC varied from 8.7% to74.9%, displaying strong and moderate spatial correlation, moreover their SM/SRMS ratios were low, indicating that the models fit well. In the 0～100 cm soil layer under the bamboo groves, the pool of PhytOC reached 4.23 t hm^-2, significantly higher than that under the Chinese fir forest, Masson pine forest, broadleaf forest and mixed conifer-broadleaf forest. Kriging reveals that the contents of PhytOC displayed a decreasing trend with soil depth, which is quite similar to the distributions of Phytolith and total silicon in the top-soil. Besides that, a ultra-significantly positive correlation（p <0.01）was observed between them, and a significant positive relationship, too, between the content of PhytOC in the 0~100 cm soil layer and age of the bamboo forest, but a significantly negative one between the content of PhytOC and elevation of the groves（p <0.05）.【Conclusion】All the findings in this study suggest that to raise the content of soil silicon may help increase the content of soil Phytolith and soil PhytOC in the top-soil; and that Dendrocalamus latiflorus Munro groves can hold a large pool of PhytOC, because the plant per se has a high content of PhytOC, and the soil under the groves is highly capable of fixing and accumulating PhytOC, as well. Therefore, the Dendrocalamus latiflorus Munro ecosystem plays an important role in expanding the stable organic carbon pool in the soil.