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以海南岛霸王岭刀耕火种和吊罗山择伐恢复的次生林为研究对象,设置幼龄林、中龄林和老龄林样地,研究凋落物及不同土层的最大持水率和自然含水率随干扰类型及恢复阶段的变化规律。结果显示,(1)刀耕火种凋落物和土壤的最大持水率及自然持水率都小于择伐;(2)两种干扰类型的凋落物最大持水率随着森林恢复而减小,自然含水率在3个恢复阶段间无显著差异。刀耕火种土壤的最大持水率随着森林恢复而增大。择伐0~40cm土层最大持水率先减小后增大,40~60cm土壤最大持水率在3个恢复阶段间无显著差异;(3)两种干扰类型的凋落物最大持水率和自然含水率都显著大于土壤;总体上,浅层土壤的最大持水率大于深层土壤,但不同土层间自然含水率无显著差异。(4)两种干扰类型中,凋落物与不同土层间的最大持水率显著负相关,二者间的自然持水率相关不显著。刀耕火种不同深度土壤间的最大持水率显著正相关;择伐不同深度土壤间的最大持水率及自然持水率都显著正相关。研究结果将为中国热带次生林生态恢复提供参考。
Taking Bailingling of Hainan Island and secondary forest of Diaoluoshan selective cutting restoration as the research object, the maximum water holding capacity and natural water content of litter and different soil layers were studied with young forest, middle-aged forest and old-aged forest The types of interference and the changing rules during the recovery phase. The results showed that: (1) the maximum water holding rate and natural water holding rate of litter and soil were lower than that of selective cutting; (2) The maximum water holding rate of litter with two types of disturbance decreased with the restoration of forest, There was no significant difference in rates between the three recovery stages. The maximum water holding capacity of slash-and-burn seeds increases with the restoration of forests. The maximum water holding capacity of 0-40 cm soil layer in selective cutting decreased first and then increased, and the maximum water holding rate in 40-60 cm soil layer had no significant difference among three recovery stages. (3) The maximum water holding rate The natural water content was significantly higher than that of the soil. In general, the maximum water holding capacity of the shallow soil was higher than that of the deep soil, but there was no significant difference between the different soil moisture contents. (4) Among the two types of disturbance, the maximum water retention of litter and different soil layers was significantly and negatively correlated, and the correlation between the two was not significant. There was a significant positive correlation between the maximum water holding capacity of slash and sowing soil at different depths. The maximum water holding capacity and natural water holding capacity of soil at different depths were significantly and positively correlated. The results will provide reference for the ecological restoration of tropical secondary forests in China.