CAJ | 학술논문

根据宁夏盐渍化土壤的分布区域,采集了不同类型盐渍化土壤样品(0～20 cm)141个,测定了土壤浸提液电导率与水溶性盐含量及其盐分组成,系统研究了残渣烘干法土壤水溶盐含量与电导率之间的关系.结果如下:(1) 土壤水溶性盐分离子阳离子以钠离子含量最高,镁、钙离子含量次之,阴离子以氯离子含量最高,硫酸根离子含量次之;(2) 从阴离子组成来看,供试土壤以硫酸盐-氯化物型、氯化物-硫酸盐型和硫酸盐型为主,从阳离子组成来看,以镁钙盐型、钙镁盐型和钠盐型为主;(3) 从5种函数模式中筛选出土壤浸提液电导率与其残渣烘干法水溶盐含量之间的最优回归关系,当不区分土壤盐分类型时,可采用二次式(通式)y=0.1609x~2+2.9176x-0.0141求解土壤含盐量;当已知土壤盐分类型时,有针对性地选用不同盐分类型最优回归式计算;(4) 提出了电导率法测定土壤水溶盐含量校正为残渣烘干法水溶盐含量的关系式.
근거저하염지화토양적분포구역,채집료불동류형염지화토양양품(0～20 cm)141개,측정료토양침제액전도솔여수용성염함량급기염분조성,계통연구료잔사홍간법토양수용염함량여전도솔지간적관계.결과여하:(1) 토양수용성염분리자양리자이납리자함량최고,미、개리자함량차지,음리자이록리자함량최고,류산근리자함량차지;(2) 종음리자조성래간,공시토양이류산염-록화물형、록화물-류산염형화류산염형위주,종양리자조성래간,이미개염형、개미염형화납염형위주;(3) 종5충함수모식중사선출토양침제액전도솔여기잔사홍간법수용염함량지간적최우회귀관계,당불구분토양염분류형시,가채용이차식(통식)y=0.1609x~2+2.9176x-0.0141구해토양함염량;당이지토양염분류형시,유침대성지선용불동염분류형최우회귀식계산;(4) 제출료전도솔법측정토양수용염함량교정위잔사홍간법수용염함량적관계식.
Based on distributing areas of the salt-affected soils in Ningxia, 141 soil samples of surface layer in 0～20 cm with different types of salt-affected soils from various regions of Ningxia were collected, respectively. The electrical conductivities of the soil extracts by using 5∶1 of the ratio of water to soil and the content of soil soluble salts were determined with residue-drying method. The relationship between soluble salt content by residue-drying method and the electrical conductivity in the soil extracts was studied. The results are as follows: (1) The ionic components of the soluble salt for tested soils were proved up. The Na~+ content was the highest and Ca~(2+) and Mg~(2+) contents were higher in 4 cations. The Cl~- content was the highest and SO_4~(2-) content was quite high in 4 anions. (2) The classifying standard of salt component types for the salt-affected soils in Ningxia Province was perfected. The salt component types for the salt-affected soils were found out. In anion components, the types of sulphate-chloride, chloride-sulphate and sulphate were dominant. In cation components, the types of Mg-Ca, Ca-Mg and Na were dominant. (3) The regressive equations between the soluble salt content and the electrical conductivity for salt-affected soils of different types in Ningxia were obtained. The optimal regressive equation between soluble salt content by residue-drying method and the electrical conductivity had been screened out from 5 kinds of function patterns. When the soil salt component types were not differentiated, the soil salt content was calculated by using the formula of y=0.1609x~2+2.9176x-0.0141. While the soil salt component types have been known, the soil salt content was calculated by using the optimal regressive equations of different salt types. (4) The revised equations of the content of soil soluble salts from an electrical conductivity method to residue-drying method were put forward. The method will supply a scientific basis for testing exactly and rapidly the contents of soil soluble salts.