保水剂对核桃幼苗土壤水分物理性质的影响

Effects of Water Retaining Agent on Soil Moisture Physical Properties of Walnut Seedling

为提高干旱瘠薄地的土壤理化性质,减少干旱对树木生长的影响。本研究以核桃(Juglans regia L.)为研究树种,将5目、10目、30目粒径的保水剂施入土壤中,分析保水剂对核桃幼苗土壤水分物理性质的影响。结果表明:(1)保水剂能明显降低核桃幼苗的土壤容重,其中保水剂为5目、10目、30目时,核桃土壤容重分别是对照组的96.02%、96.59%、92.05%。(2)保水剂能明显改善土壤的持水性能,增加土壤有效水储存容量。施加保水剂后土壤非毛管孔隙度、毛管孔隙度和总孔隙度明显增加(P≤0.05),且保水剂粒径越小三种孔隙度在土壤中的占比越高,当保水剂粒径达到30目时,核桃土壤的非毛管孔隙度、毛管孔隙度和总孔隙度分别为对照的1.61倍、1.29倍、1.33倍。总体而言,保水剂能改善土壤持水、保肥和通气性能,提高土壤涵养水源能力,对干旱瘠薄地树木栽植有重要意义。

In this study,to improve the physical and chemical properties of soil in arid barren mountains and to reduce the influence of drought on tree growth,walnut(Juglans regia L.)was selected as the research tree species and water retaining agents with particle sizes of 5 mesh,10 mesh,and 30 mesh,respectively,were applied into the soil to analyze the effects of water retaining agents on the physical properties of walnut soil.The results showed as follows:(1)Soil bulk density of walnut was significantly reduced by water retaining agent,which was 96.02%,96.59%,and 92.05%of the control group when water retaining agent was 5 mesh,10 mesh,and 30 mesh,respectively.(2)Water retaining agent could obviously improve soil water holding capacity and increase soil effective water storage capacity.The non-capillary porosity,capillary porosity,and total porosity of walnut soil increased significantly(P≤0.05),and the proportion of the three kinds of porosity was higher with smaller water retaining agent particles.When the water retaining agent particles were 30 mesh,the non-capillary porosity,capillary porosity,and total porosity of walnut soil were 1.61,1.29,and 1.33times of the control soil,respectively.In general,water retaining agent can improve soil water retention,fertilizer retention,and aeration performance,and also improve soil water conservation capacity,which is of great significance for barren and arid mountain tree planting.