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根据对哀牢山北部徐家坝地区木果石栎林化学元素的吸收、分布及其生物循环的研究结果表明，碳素在树干中含量最高，而其它元素的含量均以叶片最高，枝和根其次，树干最低。该森林群落中碳、氮、磷、钾、钙、镁、锰、钠、铝和铁元素的积累量达２６０３４６ｋｇ／ｈｍ￣２，其中乔木层的元素积累量占该群落元素总积累量的９８．５％，灌木层和草本层的元素积累量仅分别占１．３％和０．２％。在该群落中各元素的积累量以碳＞钙＞氮＞钾．＞镁＞铝＞磷＞钠＞铁＞锰为序。碳、钙和氮在树干中积累最多，铁和钾在根系中积累较多。土壤中碳、氮和铝的贮量较高，磷、镁和钾较少。该群落元素的年吸收量分别为：碳８４０９，氮８４，磷１０，钾５６，钙９２，镁１９，锰１０，铝１２和铁５ｋｇ／ｈｍ￣２。通过凋落物每年归还给土壤的元素总量的约３８７２ｋｇ／ｈｍ￣２，其中以碳、钙和氮的归还量最多，分别占年总归还量的９５．７％，１．４％和１．４％。在该群落中各元素的循环周转期分别为：碳６９年，氮２９年，磷４６年，钾４８年，钙３８年，镁３１年，锰１９年，铝６０年和铁１８４年。
According to the study on the chemical elements absorption, distribution and biological cycle in the Quercus mongolica forest in the Xujiaba area in northern Ailao Mountains, the results showed that the content of carbon in the trunk was the highest while that of other elements were the highest, Second, the lowest trunk. The accumulative amount of carbon, nitrogen, phosphorus, potassium, calcium, magnesium, manganese, sodium, aluminum and iron in the forest community reached 260346kg / hm2, in which the elemental accumulation of arbor layer accounted for 98 .5%, the accumulation of elements in the shrub layer and herb layer accounted for only 1.3% and 0.2% respectively. The amount of accumulation of each element in the community is carbon> calcium> nitrogen> potassium. > Magnesium> aluminum> phosphorus> sodium> iron> manganese order. Carbon, calcium and nitrogen accumulated most in the trunk, while iron and potassium accumulated more in the root system. Soil carbon, nitrogen and aluminum reserves of higher, less phosphorus, magnesium and potassium. The annual absorption of the community elements are: carbon 8409, nitrogen 84, phosphorus 10, potassium 56, calcium 92, magnesium 19, manganese 10, aluminum 12 and iron 5kg / hm ~ 2. The total amount of elements returned to the soil by litter is about 3872kg / hm ~ 2, of which the most is carbon, calcium and nitrogen, accounting for 95.7%, 1.4% and 1 of the annual total return, respectively. 4%. The cycling life cycle of each element in the community was 69 years for carbon, 29 years for nitrogen, 46 years for phosphorus, 48 years for potassium, 38 years for calcium, 31 years for manganese, 19 years for aluminum, 60 years for aluminum and 184 years for iron.