砒砂岩对毛乌素沙地风沙土储水能力影响的研究

为探析砒砂岩对于风沙土储水能力的影响,在毛乌素沙地设置不同比例砒砂岩与沙复配成土试验小区(砒砂岩与沙的体积比分别为1∶1,1∶2,1∶5),进行单季玉米种植,并分别于2013—2015年连续3年对0—120cm深度内土壤水分进行动态监测。结果表明:从2013—2015年,适量砒砂岩的加入将风沙土储水量从100mm左右提升至200mm以上,并可逐步调节土壤水分至不亏缺状态,显著提升土壤的保水蓄水能力,有利于作物生长需求;土壤储水以40cm以下中深层土壤储水能力改善作用最为明显,且经多年种植,0—40cm和80—120cm土层逐步成为土壤水分较为稳定的土层,利于作物根系对水分的吸收利用;砒砂岩与沙1∶1~1∶5范围内,随砒砂岩所占比例提高,复配土储水特征的改善作用有增强趋势,但趋势不显著。

Study on the Influence of Soft Rock on Moisture Storage Capacity of Sandy Soil

To analyze how the soft rock influence the moisture storage capacity of sandy soil,experimental plots with different ratios of soft rock and sandy soil were set in Mu Us sand land,with spring maize planted one season per year,and the soil moisture of the depth 0-120 cm was frequently monitored during 2013—2015.The results showed that moderate soft rock could improve the moisture storage capacity of sandy soil from 100 mm in 2013 to over 200 mm in 2015,promote the soil moisture to none deficiency state,strengthen the moisture storage capacity of soil,which was beneficial for the crop growth.Moisture storage capacity of soil layer below 40 cm was promoted most obviously,and the layers of 0-40 cm and 80-120 cm turned into more stable layers for moisture storage,which was helpful for the crops.Between the soft rock and sandy soil with ratio 1 ∶ 1 to 1 ∶ 5,with the addition of soft rock,the moisture storage capacity of the soil was enhanced,but not significant.