论文部分内容阅读
1、选择耐盐树种。经过几年的观察发现:紫穗槐、白榆抗盐能力较强,在土壤含盐量达0.45%时仍可生长良好;刺槐、国槐、臭椿、白腊等抗盐能力中等,土壤含盐量0.2%以下尚可栽植;杨、柳抗盐能力差。在黄骅市我们选择了国槐为主要绿化树种,生长良好。同时选择了树姿优美,病虫少的白腊作试验,栽后全部成活,且生长迅速。 2、选择最佳栽植时期。春季栽植后经浇水起到一定洗盐作用,但易使土壤板结,成活率低。经不同季节对比试验,晚秋带叶栽植成活率高。这是因为秋季土壤经雨季淋溶后含盐降低,秋季蒸腾量小,地下盐分不易上升,新植幼树限系在含盐低的土壤中经过恢复,适应后第二年能更快生长以减少反盐高峰期影响。
1, choose salt-tolerant species. After several years of observation, it was found that Amorpha fruticosa and Ulmus pumila were more resistant to salt and could still grow well when soil salinity reached 0.45%. The salt resistance of Robinia pseudoacacia, Sophora japonica, Ailanthus altissima, 0.2% of the following can still be planted; Yang, Liu salt tolerance. In Huanghua we chose Sophora japonica as the main afforestation species and grow well. At the same time choose a beautiful tree posture, less pests and diseases for the white wax test, after planting all survive, and grow rapidly. 2, choose the best planting period. After planting in the spring watering play a role in washing salt, but easy to make the soil compaction, low survival rate. After different seasons comparison experiment, late autumn with high survival rate of leaf planting. This is because soil salinity decreased after the rainy season leaching, autumn transpiration was small, the underground salt is not easy to rise, the new plantation trees in low salinity soil after the restoration, to adapt to the second year of faster growth Reduce the impact of anti-salt peak.