摘要
为了探明龟裂碱土水盐时空分布特征,该研究对龟裂碱土水盐进行跟踪监测,分析在自然条件下土壤水盐时空分布和运移特征。结果表明:0～20 cm土壤含水率最小,变异系数最大;80～100 cm土壤含水率较大,变异系数较小。土壤全盐和碱化度变异性强,空间分布不均,0～40 cm土壤全盐和碱化度的变异系数分别为60.4%和67.6%,40～100 cm土壤全盐和碱化度变异系数较小。0～20 cm土壤全盐和碱化度最大,20～100 cm土壤全盐和碱化度逐层降低。0～40 cm土壤含水率随季节变化幅度较大,40～100 cm变化幅度较平稳,土壤含水率逐年减小。土层0～20 cm全盐和碱化度极显著高于其他土层,土层0～40 cm土壤脱盐、积盐交替,盐分变化活跃,土壤全盐和碱化度逐年呈增加的趋势。结果为龟裂碱土改良水盐调控提供依据。
Takyric solonetz land,a typical subclass of alkali soil,is widely distributed in the North of Yinchuan Plain of Ningxia province,West Hetao Plain and north Xinjiang desert steppe in China.Due to the hard soil texture,poor permeability and difficult improvement,it has become the main factor severely affecting the development of local agriculture,and is expected to bring threat to the regional food security in the future.More and more improvement techniques have been developed to achieve a sustainable utilization of saline-alkali waste land,but the salt-water spatial and temporal distribution characteristics in newly reclaimed takyric solonetz land remains unknown.We conducted 3a field comparative experiments to analyze the water-salt spatial and temporal distribution under natural conditions in newly reclaimed takyric solonetz land at the farmland of Xidatan,Ningxia,China,which located in 106?24?209?E,38?50?289?N.The results showed that:the soil moisture content was minimality in 0-20 cm soil,and its coefficient variation was maximum.Moisture content in 80-100 cm soil was larger,and its coefficient variation was smaller.Soil total salt and alkalinity variability were great,and which the spatial distribution were uneven.The variation coefficients of soil total salt and alkalinity in 20-40 cm soil were respectively 51.2%and 60.4%,and the variation coefficients of soil total salt and alkalinity in 40-100 cm soil was less.The soil total salt and alkalinity of 0-20 cm soil were the largest,and the soil total salt and alkalinity of 20-100 cm soil were reduced layer by layer.The moisture content of 0-40 cm soil varied greatly with the season,the change range of 40-100 cm soil was relatively stable,and the soil moisture content decreased year by year.Total salt and alkalinity of 0-20 cm was significantly higher than other soil layers.Soil desalination and salt accumulation in the soil layer 0-40 cm were alternating,salt change was active,and the soil total salt and alkalinity were increasing year by year.Soil mainly contains Na^+,Cl^-,SO4^2-and HCO3^-at 0-100 cm depth.Alkalinity and salt content at the 0-60 cm depth varied greatly among seasons.Soil moisture content gradually increased from the top soil layer(0 cm)to the deep soil layer(100 cm).These results will also provide a technical support for salt-water management of the newly reclaimed takyric solonetz farmlands,and a guide for the sustainable development and utilization of wasteland takyric solonetz land.
作者
杨军
马艳
孙兆军
Yang Jun;Ma Yan;Sun Zhaojun(School of Civil Engineering,North Minzu University,Yinchuan 750021,China;Institute of Environmental Engineering,Ningxia University,Yinchuan,750021,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2018年第B11期214-221,共8页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家"十二五"科技支撑计划课题(2013BAC02B05)
宁夏自然基金(NZ17092)
宁夏高等学校科学研究项目(NGY2017151)
北方民族大学人才引进项目(2017)
关键词
盐分
灌溉
水盐运移
碱化度
龟裂碱土
时空分布
salinity
irrigation
salt-water transportation
alkalinity
taryric solonetz land
time and space distribution
作者简介
杨军,博士,工程师,主要从事盐碱地水盐调控和节水灌溉理论与新技术研究。Email:yangjun790608@126.com;通信作者:孙兆军,博士,研究员,主要从事盐碱地改良和节水灌溉技术研究。Email:sunzhaojunyx@126.com。
