机械沙障组合对土壤含水量及温度的影响

Effect of Sand Barrier Combinations on the Water Content and Temperature of Soil

工程治沙技术的应用日益广泛,机械沙障是最早应用于防治风沙危害的工程措施之一,然而对于机械沙障如何影响沙土物理性质的研究较少。利用中子水分仪和温度计,对宁夏沙坡头地区两种机械沙障组合(直立式沙障+平铺式沙障)下不同土层的土壤含水量和温度进行测定分析,以未铺设沙障的裸沙为对照,为揭示工程固沙措施间接防风固沙机理提供科学依据。结果表明:机械沙障布设初期,直立式沙障加平铺式双层网明显提高了土壤温度,但随着布设时间的推移逐渐趋于稳定;机械沙障直接影响着土壤水分的再分配,不同机械沙障组合对土壤水分的再分配有着不同的影响,且有一定的蓄水保水作用。

There was much research focusing on mechanical sand barrier which is one of the earliest engineering sand storms controlling methods.However,less is known about the impacts of mechanical sand barrier on soil physical properties.Here,we used soil moisture content and temperature measured by neutron probe and thermometer with the increment of depth in two kinds of mechanical sand barriers combination（vertical sand barrier and flat sand barrier）in Shapotou,Ningxia with bare sand dune without sand-protecting barrier serving as a control together to investigate the mechanism that how engineering techniques prevent wind hazards and control sand storms indirectly.The results showed that soil temperature increased significantly at the beginning of the vertical sand barrier and flat sand barrier set up and tended to stabilize gradually with time.Mechanical sand barriers directly impacted the redistribution of soil moisture and improved water retention with different results coming from different combinations of sand barriers.