风化煤对苏打盐化土中微量元素有效性的影响

Effect of Weathered Coal on Soda-saline Soil Availability of Trace Elements

针对大同盆地苏打盐化土,利用山西左权、灵石和云南昭通的风化煤在人工气候箱中进行培养试验,研究了不同风化煤对苏打盐化土的p H值、电导率(EC)、土壤有效Fe、有效Mn、有效Cu和有效Zn的影响。结果表明,风化煤可以显著降低苏打盐化土的p H值,随着风化煤施用量的增加p H值呈显著降低趋势,风化煤用量达到6 g时,山西左权(ZQ)、云南昭通(ZT)和山西灵石(LS)3种风化煤分别降低了0.28,0.87,0.43;3种风化煤均有提高苏打盐化土Fe,Mn,Zn有效性的效果。在风化煤量达到3 g时,3种风化煤ZQ,ZT,LS的有效Fe比CK分别增加了1.73,10.55,2.16 mg/kg,有效Zn比CK分别提高了89%,37%,41%。说明风化煤能够有效降低苏打盐化土p H值,并且提高苏打盐化土Fe,Mn,Zn的有效性。

Soda-saline soil is one of important reserve arable land resources for food safety. By cultivating indoor with soda-saline soil derived from the Datong Basin of Shanxi province, the experiment studied the effect of the soil pH and available microelements after use weathered coal from Shanxi Zuoquan, Yunnan Zhaotong and Shanxi Lingshi. The results showed that all of this three treatments could decrease soda-saline soil pH value, the best one decreased 0.87. The weathered coal had a certain impact on the effectiveness of four kinds of trace elements. Fe,Zn and Mn availability significant increased when weathered coal application amount up to 3 g. Comparison of three experimental treatments and CK, Fe increased by 1.73,10.55,2.16 mg/kg. Therefore, the results illustrated that weathered coal could improve within a certain range the soda-saline soil and reduce soil pH value.