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该文作者研究了HSPAN等多种吸水剂的适宜使用比例.结果证明:在降水比较正常的年份,经过处理的油松、侧柏苗木成活率均高于对照;使用比例以1%和2%为宜,过高(5%和8%)不必要,过低(0.5%)效果不明显.使用适宜比例虽可在干旱年份提高造林成活率,但其保存率则以使用较高的吸水剂比例为佳.在极端干旱的年份用吸水剂处理的苗木存活时间可延长40～50d(天).使用适宜比例处理的苗木,其发根时间早于对照.至少不迟于对照;使用比例过高会推迟发根时间.苗木栽植后,经过根系恢复阶段,吸水剂的作用开始显现.以较低比例处理的油松,根量增加迅速,新根长度较大;而侧柏起初是使用较高比例的根量大,新根长度长,但随时间推移出现新根变色现象.经过吸水剂处理的苗木具有较旺盛的活力.适宜的使用比例不仅可以促进苗木当年的高生长。而且这种效应至少能够延续3a(年).吸水剂不同的使用比例造林效果不同的原因,与各自在苗木根际形成的湿度环境不同有关,混入比例高的根际含水量增多;但也与根际土壤通气性有关,混入比例高的,氧化还原电位值降低,对根系发育有害.使用不同比例的两树种苗木,其针叶含水量、蒸腾强度和水分亏缺程度不一.适宜的吸水剂使用比例有利于提高净光合速率,增加干物质积累,促进幼树生长.
The authors studied the appropriate use of HSPAN and other water-absorbent ratio.The results show that: in the normal years of precipitation, the treated pine trees, Platycladus orientalis seedling survival rates were higher than the control; the use of the ratio of 1% and 2% (5% and 8%) are not necessary, and the effect of low (0.5%) is not obvious.While using the appropriate proportion can improve the survival rate of afforestation in the dry years, but the preservation rate is higher by using the higher water-absorbing agent Proportion of the best. In extreme drought year with seedlings treated with water-absorbent survival time can be extended 40 ~ 50d (days). Using the appropriate proportion of seedlings, the rooting time is earlier than the control. At least not later than the control; Gao will postpone the rooting time.When the seedlings planted, after the root recovery stage, the role of water-absorbing agent began to appear.The lower proportion of Pinus tabulaeformis, root volume increased rapidly, the new root length is larger; The high proportion of the root mass, the length of the new root, but over time appear new root discoloration phenomenon.After treated by water-absorbent seedlings have a more vigorous vitality.Appropriate use of proportion can not only promote seedling year high growth. And this effect can continue for at least 3a (year) .The reason of different afforestation effect of different water-absorbing agent’s proportion afforestation effect is related to their different humidity environment formed in seedling rhizosphere, Rhizosphere soil aeration, mixed with a high proportion, redox potential value is reduced, harmful to root development.Using different proportion of two tree seedlings, the needle water content, transpiration intensity and the degree of water deficit.Adapt appropriate water The proportion of agent is conducive to increase net photosynthetic rate, increase dry matter accumulation, and promote young tree growth.