EFFECT OF REFORESTATION USING TECTONA-GRANDIS ON INFILTRATION AND SOIL-WATER RETENTION
EFFECT OF REFORESTATION USING TECTONA-GRANDIS ON INFILTRATION AND SOIL-WATER RETENTION
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DOI：
10.1016/0378-1127(95)03573-s
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发表时间：
1995-09-01
影响因子：
3.7
通讯作者：
MAPA, RB
中科院分区：
文献类型：
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作者：
MAPA, RB
许多研究报告了森林砍伐后热带土壤物理性质的变化，而关于重新造林的研究却很少。本文报道了在斯里兰卡的一个Rhodudult，用柚木重新造林对入渗和土壤水分保持的影响。研究了邻近地区12年以上的退耕还林、退耕还草和未开垦草地。结果表明，退耕地土壤稳定入渗速率最高。这是由于更好的土壤结构和更多的大孔隙创造的根系活动和高有机质含量。土壤水分保持在任何给定的吸力是最高的再造林土壤在两个深度的研究。在低吸力条件下，土壤持水能力的提高是由于土壤结构的发展，而在高吸力条件下，则是由于有机质的亲水性。耕地土壤和草地土壤在入渗和持水方面没有显著差异。体积密度最低的再造林土壤，表明高孔隙度。这表明重新造林的地区比耕地和草原地区可以接受和储存更多的水。尽管重新造林后植物可利用的水分没有显著增加，但增加渗透和保水将减少地表径流，保持水土，恢复水文平衡，这是这些地区重新造林的一个主要目标。
Many studies have reported changes in the soil physical properties of tropical soils after deforestation, whereas studies on reforestation are scarce. This paper reports on the effects of reforestation using Tectona grandis on infiltration and soil water retention of a Rhodudult in Sri Lanka. Adjacent land which has been reforested, cultivated and neglected as grassland for more than 12 years was studied. The results showed that the reforested land has the highest steady infiltration rate. This is due to better soil structure and more macro-pores created by root activity and high organic matter content. The soil water retention at any given suction was highest in the reforested soil at both depths studied. The increase in water retention at low suctions is attributed to soil structure development and that at higher suctions to the hydrophilic nature of organic matter. The cultivated and grassland soils did not show any significant difference in infiltration or soil water retention. The bulk density was lowest in reforested soils, indicating high porosities. This illustrates that reforested areas can accept and store more water than cultivated and grassland areas. Even though the plant available water did not show any significant increase with reforestation, increased infiltration and water retention will decrease surface run off and conserve soil and water, restoring the hydrological balance, a major objective of reforestation in these areas.