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In order to understand the dynamic changes of leaf mineral elements in different key seasonal periods of Sapindus Yuanhua clonal raw material forests, and to reveal the characteristics of nutrient demand of this clonal lineage, we provided a theoretical basis for the scientific development of nutrient management system. The 5 a, 6 a and 7 a years old Sapindus Yuanhua clonal forests in Jianning county, Fujian province were used for the study, and the contents of N, P, K, Ca, S, Mg, Fe, Zn and B were measured at the leaf development stage, the end of inflorescence, the end of anthesis, the beginning of fruit expansion, the fruit color change stage and the fruit ripening stage. The contents of N, P, K, Ca and Mg in the leaves of Yuanhua clonal forest showed a general trend of decreasing, then increasing and then decreasing in different critical periods, and all of them reached the highest in the early stage of fruit expansion. There were significant differences in the contents of N and P in the end of inflorescence and the early stage of fruit expansion. K content at the beginning of fruit expansion was significantly higher than the other key reproductive periods, and there was no significant difference between the rest of the reproductive periods, while Ca content and Mg content were significantly different between the leaf expansion period and the beginning of fruit expansion (P<0.05). Fe and B content showed a tendency of increasing and then decreasing, with Fe content being significantly higher than that of the rest of the reproductive periods during the fruit color change period and B content decreasing dramatically at the end of the flowering period, and being significantly lower than that of the rest of the reproductive periods (P<0.05). Zn and S contents did not change significantly throughout the year. The N, K, P and Mg contents of leaves in the three stand ages were significantly and positively correlated. Ca, K and Fe contents were significantly and positively correlated. S and Zn contents were significantly and negatively correlated, and Zn content was significantly and negatively correlated with S and B contents, respectively. The fruit-sitting period (June to the end of July) can be a suitable period for leaf nutritional diagnosis. Fertilizer application should consider the correlation between elements. At the end of inflorescence extraction, N, P and B fertilizers should be applied early. In the fruit-sitting period, an appropriate amount of fertilizer should be applied, combined with the application of micronutrient fertilizer at the same time.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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