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采用根钻法,分析了橡胶幼树期(5 a)、初产期(9 a)和旺产期(16 a)林下土壤水分特征及橡胶树细根生物量.结果表明:橡胶树龄越大,土壤含水量越高,而橡胶树细根生物量越少;不同树龄橡胶林0～60 cm土壤含水量随着土层深度的增加而升高,年内变化则呈“双峰”型;不同树龄橡胶树细根生物量最大值均出现在10 cm土层,且随着土层深度的增加而减少,细根生物量年内变化同样呈“双峰”型,但不同树龄细根生物量峰值的出现时间不一致.土壤含水量和土层深度是橡胶树细根生物量的主要影响因子.
The root-drilling method was used to analyze the characteristics of soil moisture and the fine root biomass of rubber trees in the young tree stage (5 a), initial stage (9 a) and high season (16 a). The results showed that: , The higher the soil water content, the less the fine root biomass of rubber tree. The soil water content of 0-60 cm soil layer of different age rubber plantations increased with the depth of soil layer, and the variation was “bimodal” during the year. The maximum root biomass of all tree species with different ages appeared in 10 cm soil layer and decreased with the increase of soil depth. The change of fine root biomass was also “bimodal” in the year, but the fine root biomass The peaks appeared at different times.The soil water content and soil depth were the main influencing factors of fine root biomass of rubber trees.