【摘要】 针对在岷江上游干旱河谷土壤水分状况是坡地植被恢复的主要限制因子的现状 ,对保水剂在干旱河谷造林中的应用进行了试验研究 ,结果表明 ,sk 4保水剂质量分数 (w)在 5× 10 -4 ～ 1× 10 -2 范围内 ,保水剂的持水和供水能力随着浓度的增加而提高 ,但过高质量分数的保水剂使用后未发现土壤有效供水能力的提高 .保水剂sk 4在w =5× 10 -3 即能达到较理想的保水和供水效果 ,浓度过高仅仅增加土壤残余含水量 .野外应用表明 ,适当浓度的保水剂可以有效提高土壤保水能力和供水能力 ,提高苗木根冠比和成活率 .图 1表 5参 10更多还原

【Abstract】 Poor soil moisture is one of the key restrictions affecting to reforestation in dry valleys along the upper reaches of the Minjiang River. The results of this study showed that water supply and moisture holding capacity of soil increased with the concentration of the water absorbent polymers in soil to a certain extent. Polymers sk 4 could well affect soil water supply and moisture holding capacity at a fraction of 5 10 -3 . However, exorbitant concentration of polymers did not improve water supply capacity of soil. By contrast to, will compote water with plant. Field studies also showed that proper concentration of polymers could effectively improve water supply and moisture holding capacity, so as to improve the survival rate of seedlings. Fig 1, Tab 5, Ref 10更多还原