摘要
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10m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。
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
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2013年第9期94-102,294,共10页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金资助项目(51179150)
国家自然科学基金重点项目(91025018)
关键词
土壤
水分
热传递
饱和导水率
导气率
导热率
地统计学
空间变异
soils
moisture
heat transfer
soil water conductivity
air permeability
heat conductivity
geostatistics
spatial variability
