金沙江干热河谷银合欢人工林对土壤养分的影响

通过干热河谷银合欢人工林对土壤改良效应5年的研究,结果表明:银合欢林具有很好的土壤改良效应,土壤有机质明显高于CK,在0～20 cm,20～40cm和40～60cm的土层中,比CK分别高52.61%,51.09%和43.52%,土壤有机质随着土壤深度的增加而减少.pH在0～20cm,20～40cm和40～60cm的土层...

Effects of Soil Nutrients on Planted Leucaena leucocephala Forest in the Dry-hot Jinshajiang River Valley

The soil improvement effect on the planted Leucaena leucocephala forest in the dry-hot Jinshajiang River Valley was researched for five years. The results show that the soil improvement effect on the forest was obvious. Soil organic matter content was obviously higher than CK, its values at soil depths of 0-20 cm, 20-40 cm and 40-60 cm under the forest were 52.61%, 51.09% and 43.52% higher than CK respectively, and it decreased with the increase of soil depth. At soil depths of 0-20 cm, 20-40 cm and 40-60 cm, the pH values of forest soil were 8.28%, 2.41% and 2.19% lower than CK respectively. Total soil N content was 43.75% higher than CK, it decreased with the increase of soil depth, and there was a significant correlation between total soil N content and soil depth. Total soil P content was 0.05 mg/kg higher than CK only. The difference of available P content between the forest soil and CK was not obvious. Total soil K content was 0.98 mg/kg higher than CK, and the effect of total K content on the forest was not obvious. The available K content in the forest soil was 136.79 mg/kg, and it was 69.45 mg/kg higher than CK.