种稻对周围旱地土壤盐分和土壤水分含量的影响

为了研究种稻对周围旱地影响的程度和范围,选择稻旱田之间无沟和有沟相隔型两种类型,以不受种稻影响的老旱田作对照,在距稻田50、80、150和200m处各埋设定位观测井,监测种稻对地下水埋深、土壤水分含量和土壤盐分含量的影响。结果表明,耕层土壤水分含量与地下水埋深相关极显著,耕层土壤盐分含量与地下水埋深相关极显著,在上升期,旱田距稻田距离与地下水埋深相关极显著。因此,稻旱田之间无沟相隔时,种稻对周围旱地的影响表现为稻田水直接向旱田侧渗,而使距稻田附近旱田的地下水位上升,在距稻田220.7m内地下水位会上升到危害旱作物生长的程度;稻旱田之间有沟相隔时,种稻会导致稻旱田之间排水沟水位上升,从而对周围旱田产生不利影响,这种影响即可通过沟水向旱田的侧渗发生,又表现在阻止旱田的排水上,其不利影响范围在200m以内。

Planting Rice on the Surrounding Dry Land Soil Salinity and Soil Moisture Content Influence the Research

In order to study the impact of rice growing on surrounding dry land,we choose two types of rice fields,non-ditch separated,ditch separated and dry land as the control to monitor the groundwater depth,soil moisture and soil salt content at different distances(50,80,150 and 200 m) away from the rice fields by observation wells.The results showed that: topsoil moisture content was significantly related to groundwater depth.Topsoil soil salt content was significantly related to groundwater depth.In the rising period the distances away from the rice fields was significantly associated with groundwater depth.In conclusion,for the dry land and the non-ditch separated rice field,the lateral water seepage from rice field to dry land can increase the ground water level of dry land and in the distance away from the rice fields of 220.7 m it can cause damage to the growth of dry land crops;for the dry land and ditch separated rice field,it will lead to the ditch water level rising,which have a negative impact on the surrounding dry land by lateral seepage from the ditch to dry land and block the drainage,its adverse effects are in the range of 200 m.