草场封育对盐碱土理化性质的影响

介绍了我国盐碱土的分布状况及类型,对盐碱草场采取不同措施(封育以及封育同时施加一定的人工措施)进行的改良性试验结果进行分析。结果表明,盐碱土的理化性质都发生了不同程度的变化:(1)土壤的容重仅在封育同时采取人工措施时在0~10 cm的土层中有所下降,降幅达9.27%,若不采取人工措施即仅仅围封则很难改变土壤的容重;(2)土壤毛管持水量和总孔隙度上升;(3)土壤的pH值明显下降,在封育草场内土壤的pH值已略接近中性值;(4)从土壤的交换性钠和阳离子交换量的比值即碱度来看,各土层碱化度都有大幅度下降。

Enclosure Effects on Physicochemical Properties of Saline Alkali Soil on Grassland

Distribution conditions and types of saline alkali soil in China were introduced.The improved experiment results on saline alkali grasslands were analyzed by different methods(enclosure and the artificial measures at the same time).The results showed that physicochemical properties of the saline alkali soil all took place to some extent:(1) Only with enclosure and the artificial measures at the same time,the soil bulk density decreased at the soil layer of 0～10 cm,and the reduction amounts to 9.27%,The soil bulk density was difficult to be changed if not given the artificial measures namely only enclosed;(2)The capillary moisture and total-porosity increased;(3)The ph value of the soil descended obviously,and had already be near to the neuter gender value slightly in fenced grasslands;(4)According to ESP,the ratios of exchangeability sodium of the soil and ECE exchange quantity,ESP of each soil layer descended largely.