海南滨海台地典型森林土壤物理性质及水源涵养分析

针对海南滨海台地木麻黄林、桉树林、大叶相思林、椰子林、次生林5种典型森林的土壤容重、孔隙度及凋落物持水性能进行了研究。结果表明：5种林分的土壤毛管孔隙度、非毛管孔隙度和总孔隙度上层大于下层，土壤容重为上层小于下层；大叶相思林、木麻黄林的土壤容重较小，土壤疏松，孔隙大，凋落物的储量较大，持水性能好，适宜作为滨海台地的水源涵养林。

Soil Physical Properties and Water Conservation Function of Typical Forests in the Coastal Terraces in Hainan

The soil physical properties and the water holding capacities of litter in the plantations of Casuarina equisetifolia, Eucalyptus spp, Acacia auriculaeformis, and coconut, and secondary forests in the coastal terraces in Hainan were studied. The results showed that the plantations and secondary forests under study had greater soil capillary porosities, non-capillary porosities and total porosities and lower soil densities in the upper soil layer than in the lower soil layer. The A. auriculaeformis and C. equisetifolia plantations were lower in soil density, looser in soil, larger in the soil pores and reserves of litter, and better in water-holding capacity. A. auriculaeformis and C. equisetifolia are therefore suited to be planted in the coastal terraces as water conservation forest.