摘要：Nanniwan,as a typical demonstration zone of gully control and land reclamation project on Loess Plateau,and the study of changing process of ditch soil moisture,which is influenced by gully control and land reclamation project to comprehend the redistributive feature of soil and water science in channel basin,play an important role.Particularly due to the lack of water in the dry season,the source of the soil moisture and the transformation process,which are for scientific and rational use of channel water resources and the sustainable development of gully control and land reclamation project,plays an important role.In this study,by measuring the soil moisture in the channel from 0 to 180cm in the dry season of the newly added channel formed by gully control and land reclamation project,combined with the hydrogen and oxygen isotope tracer technology and the characteristics of soil mechanical composition,the reasons for the difference of soil moisture in the channel and the transformation relationship between soil moisture and other water bodies were revealed.The results showed that the moisture content of upland and paddy fields in the gully was 16.15% and 38.61%,respectively.With the increase of soil depth,moisture content increases gradually.And from upstream to downstream,soil moisture content showed an increasing trend.Soil machinery in uplands 0-180cm and paddy fields 0-80cm was silt (78.13%,73.57%) > sand (14.55%,20.39%) > clay (7.32%,6.04%),D of soil water was -62.31%o and -65.58%o,and lsO of soil water was -8.19%o and -8.25%o,respectively.In upland 100-120cm and paddy field 40-60cm soil layers,there are weak previous layers,respectively.The soil moisture content of the above soil layer is mainly rainfall,and the soil moisture of the following soil layer is mainly groundwater recharge.The water in the pond below the steps of the dry land is mainly groundwater.This study can be used as a reference for the study on the influence of ditch treatment and land reclamation on the hydrological process of the channel.
关键词：Gully control and land reclamation;dry season;soil moisture;hydrogen and oxygen isotope;mechanical composition
