CAJ | 학술논문

为了明确黑河中游绿洲麦田土壤水气热传输动力学特征的空间变异性,该文采用地理信息系统和地统计学相结合的方法,以黑河中游临泽县麦田的水气热参数的空间分布特征为基础进行相关研究.结果表明地统计学方法可以较好地模拟土壤水气热参数的空间结构和变异特征;水气热参数的拱高与基态值之比均高于75%,采样间隔距离设为10 m可以达到较为理想的研究目标;Kringing插值研究结果表明,该区域土壤水气参数变化具有良好的一致性;总的来说,研究区域的土壤导热率具有中间高,南北两侧低的马鞍形变化趋势.该研究将为当地土壤水气热参数田间尺度空间变异研究提供一定的参考.
위료명학흑하중유록주맥전토양수기열전수동역학특정적공간변이성,해문채용지리신식계통화지통계학상결합적방법,이흑하중유림택현맥전적수기열삼수적공간분포특정위기출진행상관연구.결과표명지통계학방법가이교호지모의토양수기열삼수적공간결구화변이특정;수기열삼수적공고여기태치지비균고우75%,채양간격거리설위10 m가이체도교위이상적연구목표;Kringing삽치연구결과표명,해구역토양수기삼수변화구유량호적일치성;총적래설,연구구역적토양도열솔구유중간고,남북량측저적마안형변화추세.해연구장위당지토양수기열삼수전간척도공간변이연구제공일정적삼고.
Using statistical methods for a study on the spatial variations of soil properties has become one of hot topics in the study of soil science. Due to the deep research on the spatial variation of soil hydraulic parameters, and the lack of research on the dynamic characteristics of soil air and heat transfer, we cannot compare the spatial variation characteristics of soil, water, air, and heat transfer kinetic parameters. As the interaction between the soil and the environment as well as the precise regulation of farmland soil moisture, air and heat condition problem is receiving more and more attention, the numerical model used to study the soil moisture, air and heat transport process, effectiveness and its impact on crop growth and ecological environment has gradually become a reality. But model accuracy depends largely on the accuracy of soil, water,air, and heat transfer kinetic parameters. Thus, seeking a simple and feasible method of determining the thermal dynamic parameters of soil moisture is the focus of research around the world. In order to define the dynamiccharacteristics of water conductivity、air permeability and heat conductivity’s spatial variability, this paper examines the spatial variation of the above parameters in Linze County, an agricultural area in the middle reaches of the Heihe River Basin. PL-300 soil air permeability measurement and soil heat pulse meter were applied to measured soil air permeability and thermal conductivity. In this paper, we designed an experiment of four levels of moisture content and took the average of three replications. Hydraulic conductivity is measured by qdisc infiltration instrument, each measuring point design four suction head, based on a spatial analysis function of GIS, The results showed as follows: 1) simulate the spatial structure and variability of the water, air, and heat parameters using land statistics of a wheat field. The optimal fitting model for saturated hydraulic conductivity, air permeability, thermal conductivity are an exponential model, the sum of squared residuals are small, nearly zero, and the determination coefficient R2 reached more than 80%. The results show that the statistical method can better simulate the spatial structure and variation characteristics of soil moisture air and thermal parameters. Fractal dimension (D) was close to 2, illustrating that soil water conductivity, air permeability and heat conductivity have strong spatial variation characteristics in this region. 2) Saturated hydraulic conductivity, air permeability and heat conductivity’s C/(C+C0)>75%, had a strong degree of spatial autocorrelation in the study scale. Recommend sampling distances of hydraulic conductivity, air permeability and heat conductivity both are 10m. And sampling distances of the other soil physical parameters are recommend to be 4m. 3) Kringing interpolation results show that soil water and gas parameters change was having a certain degree of consistency, Thermal conductivity has certain regional characteristics in the study area. The higher the moisture content, bulk density and the greater the sand content are, the greater the thermal conductivity is, and the thermal conductivity has certain regional characteristics. Among the soil, thermal conductivity is high, the north and south were on both sides of the lower tendency in the saddle. The research will be for the local soil moisture, air and thermal parameters field scale space mutation research to provide a certain reference basis.