四川盆地丘陵区农林复合系统林地土壤的稳渗速率

运用Hood IL-2700自动采集土壤入渗仪测定了四川盆地丘陵区农林复合系统3种林地（柏木Cupressus funebris纯林、麻栎Quercus acutissima-柏木混交林和桤木Alnus cremastogyne-柏木混交林）土壤的稳渗速率。结果表明：同一林地的土壤稳渗速率随土层加深而下降；不同林地的各层土壤中，混交林土壤稳渗速率显著高于纯林（P＜0.05），混交林之间差异不显著（P＞0.05）。0 ~ 10 cm土层稳渗速率的大小为：栎柏混交林（13.269 mm·min^－1）＞桤柏混交林（10.438 mm·min^－1）＞柏木纯林（4.513 mm·min^－1）；10 ～ 20 cm土层稳渗速率的大小为：栎柏混交林（4.338 mm·min^－1）＞桤柏混交林（3.791 mm·min^－1）＞柏木纯林（1.329 mm·min^－1）；20 ～ 30 cm土层稳渗速率的大小为：桤柏混交林（3.095 mm·min^－1）＞栎柏混交林（2.653 mm·min^－1）＞柏木纯林（1.965 mm·min^－1）。土壤物理性状、林分结构和林地凋落物与土壤稳渗速率存在密切关系，建议在四川盆地丘陵区农林复系统景观格局配置中，应积极营建混交林林带，以提高森林的水土保持功能。表5参15

Steady infiltration rates in soils of three forest types for an agroforestry system in the hilly region of Sichuan Basin

Using a Hood infiltrometer IL-2700(Germany,2006) ,the steady infiltration rate in three soil layers(0-10,10-20,and 20-30 cm) of three forest types(a Cupressus funebris plantation,a mixed Quercus acutissima-C. funebris forest,and a mixed Alnus cremastogyne-C. funebris forest) from an agroforestry system in the hilly region of the Sichuan Basin was measured. The relationship between soil features,forest structure,and steady soil infiltration rate was also discussed. Results showed that for a given forest type...