头塘小流域不同立地类型防护林树种对比试验

Contrast Test on Protective Species of Different Site Types in Toutang Small Watershed

根据金沙江流域防护林建设的需要，在会泽县头塘小流域的４种不同立地类型内，进行了７个树种的生长和防护功能对比试验研究。通过４年对各树种树高、地径、冠幅等生长量因子的观测，７个树种在４种立地类型上均表现良好的适应性。立地类型与树种间的交互作用明显，多数树种在半阳坡中厚层黄红壤立地类型上生长良好。通过各树种在该立地类型上生长曲线的比较，评选出圣诞树、水冬瓜在３个生长因子上的生长速度最快。经对７个参试树种防护功能的测定分析，以圣诞树的水土保持功能最佳。

In Toutang small watershed of Huize county,contrast test and research were carried out on growth and protective function of 7 species in 4 different site types.Four years'observation on growth increment factors(tree height,ground diameter and crown mean width etc.)of different species indicated that the 7 tested species all had quite good adaptability to the 4 tested site types.The research also indicated that there was obvious interaction between site types and species.Most of the tested species could grow well on yellowish red soil of medium thickness. Acacia dealbata and Alnus cremastogyne were selected as the species with quite fast growth on 3 indexes of tree height,ground diameter and crown mean width.Through observation and analysis on protective function of the 7 tested species,the results showed that the protection function of Acacia dealbata was the best.