Effect of soil pore size distribution on plant-available water and least limiting water range as soil physical quality indicators

作     者：Mehdi ZANGIABADI Manoochehr GORJI Mehdi SHORAFA Saeed KHAVARI KHORASANI Saeed SAADAT Mehdi ZANGIABADI;Manoochehr GORJI;Mehdi SHORAFA;Saeed KHAVARI KHORASANI;Saeed SAADAT

作者机构：Department of Soil ScienceUniversity of TehranKaraj 31587-11167Iran Department of Seed and Plant ImprovementKhorasan-Razavi Agricultural and Natural Resources Research CentreMashhad 91659-66416Iran Department of Sustainable Land ManagementSoil and Water Research InstituteKaraj 31779-93545Iran 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2020年第30卷第2期

页      面：253-262页

核心收录：

学科分类：0818[工学-地质资源与地质工程] 09[农学] 0903[农学-农业资源与环境] 0901[农学-作物学] 090301[农学-土壤学] 

主　　题：equivalent pore diameter kurtosis location parameter matric head shape parameter skewness soil pore size distribution curve soil water availability 

摘      要：Soil pore size distribution(SPSD) is one of the most important soil physical properties. This research investigated the relationships of location and shape parameters of the SPSD curves with plant-available water(PAW) and least limiting water range(LLWR) of the light-textured soils at the Torogh Agricultural Research Station in north-eastern Iran. Soil moisture release curve(SMRC), PAW and LLWR in matric heads of 100 and 330 h Pa for the field capacity and location and shape parameters of the SPSD curves of 30 soils with different texture and organic carbon contents were determined, and the variable relationships were statistically analyzed. The results showed that the median equivalent pore diameter(de), mean de, standard deviation(SD*), and skewness of the SPSD curves were significantly correlated with PAW(PAW330) and LLWR(LLWR330) measured in a matric head of 330 h Pa. Decrease in deand increase in the diversity of soil pore size(SD*) increased PAW330 and LLWR330. The SD* values of all the soil samples were lower than the optimal ranges suggested in literature. Neither PAW nor LLWR values were significantly different in the soils with the optimal modal deand those with non-optimal modal de. Optimal values of median and mean equivalent pore diameters and kurtosis of SPSD curves led to a significant improvement of PAW330 and LLWR330 as soil physical quality indicators. It was recommended to revise the optimal ranges for SD* and modal defor future studies.