压砂地土壤盐分演替特征研究

发布时间：2019-04-13 15:48

【摘要】：针对西北旱区特有的压砂地,分析了不同种植年限压砂地土壤盐分演替特征,结果表明,裸地及新、中、老压砂地土壤盐分平均相对偏差介于-15.43%~28.14%之间,标准差介于4.44%~31.02%之间,变化范围较小,Spearman秩相关系数较大且显著相关,通过时间稳定性可初步确定研究区土壤盐分均值的代表性测点。盐分均值与代表测点值相关系数的变化范围为0.762~0.952,标准误差及平均偏差均较小,代表测点的土壤盐分与区域平均值相关性较高,差异性较小。对新砂地表层土壤盐分进行时空模拟,各时段土壤盐分累计分布曲线变化规律相似,模拟值与实测值略有差异,其空间分布基本趋势与实测数据相符。各时段土壤盐分均属于中等弱变异性,盐渍化程度表现为裸地老砂地新砂地中砂地,压砂地土壤盐分时刻都在发生着演替,中砂地土壤盐渍化程度最小,但伴随着种植时间的延长和覆盖砂石土砂比的增加,老砂地土壤盐渍化呈加剧趋势。
[Abstract]:According to the characteristics of soil salt succession in different years of planting in arid areas of northwest China, the results show that the average relative deviation of soil salt in open and middle fields is between-15.43% and 28.14%, and the results show that the soil salt content in the old and middle-old sandy fields is in the range of-15.43% and 28.14%, respectively. The standard deviation is between 4.44% and 31.02%, the range of variation is small, and the rank correlation coefficient of Spearman is large and significant. The representative measuring point of soil salt mean value can be preliminarily determined by time stability. The range of correlation coefficient between the salt mean value and the representative measurement point value was 0.762 ~ 0.952, the standard error and the average deviation were all small, the correlation between the soil salinity and the regional average value was higher and the difference was small. The temporal and spatial simulation of soil salt content in fresh sand field shows that the cumulative distribution curve of soil salt in each period is similar, the simulated value is slightly different from the measured value, and the spatial distribution trend is consistent with the measured data. The degree of salinization showed that the degree of salinization was in the middle sand field of the new sand field in the old sand field of the bare land, and the succession of the soil salt content occurred in the compressed sand land at all times, and the degree of soil salinization in the middle sand land was the least. The degree of soil salinization was the lowest in the middle sand field. However, with the extension of planting time and the increase of sand to sand ratio, the salinization of soil in the old sand field showed an aggravating trend.
【作者单位】：兰州理工大学能源与动力工程学院;
【基金】：国家自然科学基金项目(51269008,51409137) 兰州理工大学红柳青年教师培养计划资助项目(Q201310)
【分类号】：S156.4

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