Effects of Different Biochar Dosages on the Physicochemical Properties and Fertility of Coastal Saline Alkali Soil
In order to reveal the effect of different biochar dosages on the improvement of coastal saline alkali soil,five different biochar treat-ments (T0,T1,T2,T3,T4,respectively) were designed with soil fertility and physicochemical properties as the main indicators. The response law of soil pH,available nutrients,organic matter,organic carbon,profile salinity,bulk density and field water capacity under different treat-ments were observed. The results showed that soil pH,available nitrogen content,available potassium content and total nitrogen content all in-creased first and then decreased with the increase of biochar dosages. There was a significant positive correlation between soil available phos-phorus,organic matter,and organic carbon content and the biochar dosage. The maximum increase in organic carbon in the topsoil was 1 times,and the increase in available phosphorus and organic matter content was 16.3％ and 14.5％,respectively. The increase in the amount of biochar was beneficial for reducing the salt content in the 0-40 cm soil layer. At the end of the experiment,the maximum decrease in total salt content in the 0-20 cm and>20-40 cm soil layers was 14.5％ and 26.3％,respectively. As the amount of biochar increases,the soil bulk density showed a decreasing trend,while the porosity showed an increasing trend. Compared with T0,the application of biochar increased field water capacity by 1.8％-9.1％,with the largest increase in field water capacity was found under T3 application. Based on soil fertility in-dicators,physicochemical indicators and resource usage,it is recommended to use the 15 t/hm2 amount as the appropriate amount of biochar for saline alkali soil.
BiocharSaline alkali soilFertilityPhysical and chemical propertyImprovement
万方数据
维普
