摘要
黄河三角洲作为我国重要的后备土地资源区,土壤盐渍化问题突出,切实掌握土壤水盐状况及其空间规律是该区土壤盐渍化防控和土地资源高效利用的重要基础。本研究选择黄河三角洲垦利县,通过野外调查实测与室内化验分析获取土壤水盐含量数据,利用统计分析、GIS插值、缓冲区分析等方法,分析了研究区土壤水盐状况及其空间变异规律。结果显示:研究区总体盐分含量以中度为主,含盐量由表层至底层呈上升趋势,且各层土壤含盐量呈显著正相关性;含盐量较高的地区主要分布在县域东部滨海区,含盐量较低的地区主要分布在该县的西南部;土壤含盐量随着距离渤海渐远呈下降的趋势,含水量总体呈先下降后上升趋势;从黄河向两岸延伸,土壤含盐量均随距离黄河渐远呈上升的趋势,含水量呈先下降后上升趋势;土壤含盐量从大到小的不同植被类型依次为光板地>碱蓬>柽柳>马绊草>芦苇>茅草>水稻>棉花>小麦>玉米;土壤含盐量从大到小的不同地貌类型依次为洼地>微斜平地>缓岗>河滩高地。该研究基本摸清了研究区春季时相的土壤水盐状况及空间变异规律,为黄河三角洲土壤资源可持续利用提供了科学依据。
The Yellow River Delta as an important area of reserved land resources, is faced with the problem of soil salinization. Grasping the status of soil water and salt as well as their spatial variation rules is an important foundation of prevention, control and use of soil salinization. This study selected Kenli County of the Yellow River Delta, obtained soil water and salt content data through field survey and lab experi- ments, and analyzed the status of soil water and salt as well as their spatial variation rules using statistics, GIS interpolation and buffer analy- sis methods. The results showed that the general salt content in the study area was mainly moderate. Salt content increased from soil surface- layer to underlayer and salt content in each layer was significantly correlated. The areas with high saltness in surfacelayer, midd｜elayer and underlayer soil mainly distributed in the east near the Bohai Sea in Kenli County, while the areas with lower saltness mainly distributed in the southwest. Soil salt contents showed the trends of decrease, and soil water contents showed the trends of decrease first and then increase with the increase in distance to Bohai Sea. Stretching from the Yellow River, soil salt content showed increase tendency with the increase in dis- tance to the Yellow River, and water content decreased first and then increased. The order from high saltness to low of different vegetation types was naked land〉suaeda glauea〉tamarix〉vervain〉reed〉couch grass〉paddy〉cotton〉winter wheat〉maize, the order of different geomor- phie types was depression〉slightly sloping ground〉slow hillock〉beach heights. This study preliminary delineates soil water and salt status as well as their spatial variation rules in the spring season of the study area, and provides scientific basis for soil resource sustainable utilization in the Yellow River Delta.
出处
《农业资源与环境学报》
CAS
2015年第2期154-161,共8页
Journal of Agricultural Resources and Environment
基金
“十二五”国家科技支撑计划项目课题(2013BAD05B06)
国家自然科学基金(41271235)
山东省自主创新专项(2012CX90202)
关键词
垦利县
春季
土壤含盐量
土壤含水量
空间变异
Kenli County
spring season
soil salt content
soil water content
spatial variation
