海南西部桉树人工林春季土壤水分时空变化研究

对海南儋州桉树林与椰林样地连续定点采样,分析春季桉树林土壤水分时空变化及其与椰林土壤水分差异。结果表明:(1)1─4月为土壤水分消耗期,土壤水分逐渐降低,桉树林土壤水分明显低于椰林。(2)土壤水分表层、次表层、深层差异明显。桉树林土壤表层含水量较低,变化较大;次表层土壤含水量相对较为稳定;深层含水量较多,也较稳定。(3)连载代次和树龄与土壤水分含量有明显的关系。与连载代次相比,树龄对土壤水分的影响更大;树龄愈长土壤水分含量愈少;采伐之后1龄桉树林土壤水分处于恢复阶段,含水量较高。短伐连栽生产和经营方式对桉树林水生态环境造成不利影响。

Research on the Spatio-temporal Change of Soil Water in Eucalyptus Plantations in West Hainan Island

The spatio-temporal change of soil water in Eucalyptus plantations(Eucalyptus spp.) in spring and its difference with Coconut plantations(Cocos nucifera L.) were analyzed by sampling in Danzhou forest farm, Hainan. The results showed that: (1) Soil water decreased gradually from January to April, and soil water of Eucalyptus plantation was obviously lower than that of Coconut plantations. (2) Soil water contents of surface, subsurface and deep layer in Eucalyptus plantation were significantly different. The surface soil water content was the lowest and there was a large variation; subsurface soil water was relatively stable, deep water content was the highest and more stable. (3) Planting rotations and forest age had obvious relationship with soil water content. Compared with rotations, effect of forest age on soil water was more. With forest aging, soil water content was declining. The longer the forest age, the less soil water content. Soil water of 1-year-old eucalyptus forest was in recovery phase after the older forest being cut down, and the content was higher. Which revealed that short-rotation and continuous planting activity had exerted great influence on the soil water eco-environment of eucalyptus forest.