土内保墒措施在黄土高原对油松生长的影响

在黄土高原地区，研究了不同土内保墒措施对渍松幼林土壤水分状况，土壤物理才林分生长的影响。结果表明，土壤内施用保水剂、绿肥和锯末保墒材料后，土壤含水量和土壤孔隙度等有明显提高；且显著提高了油松幼林的地径和树高生长量，与对照相比，施用保水剂使树高和地径生长量分别提高了７６％和７５％，绿肥分别提高了８２％和８８％，锯末分别提高了５１％和５０％。土壤内施用保水剂时，要半保水剂和土壤充分混匀，且施入后要进行

Influence of Moisture-holding Measures in Soil on the Growth of Pinus tablaeformis on the Loess Plateau

This paper studied the effects of different mositure-holding measures in soil on the soil water content, the physical properties of soil,and the stand growth of young Pinus tabulaeformis on the Loess Plateau. The research results showed:after the application of water-retaining aids and gree manure and scobs to subsoil, the water content and porosity of soil etc distinctly increased, and the increment of tree height and diameter at ground level of young Piunus tabulaeformis trees significantly increased too, in comparison with contrast,the increment of tree height and diameter at ground level increased by 76% and 75% individually after the application of water-retaining aids to subsoil, by 82% and 88% after gree manure, by 51% and 50% after scobs. The water-retaining aids must be fixed up with soil before applied to subsoil, the mixture of water-retaining aids and soil must be covered by some soft soil after filled in the cave to be digged in for to prevent soil water evaporation, the most suitable amount applied was 0.1% of the dry soil weight in the cave to be digged.