水葫芦生物炭的理化特性和养分特征

Physicochemical Properties and Nutrient Characteristics of Water Hyacinth-derived Biochar

为水葫芦生物炭作为土壤改良剂提供依据,以水葫芦生物质为原料,在200~400℃之间进行炭化制备成水葫芦生物炭,探讨热解温度对水葫芦生物炭的理化特性和养分含量的影响。结果表明：产率随着热解温度的升高而降低,pH随热解温度的升高而升高,全氮随着热解温度的升高先升高后降,全磷、全钾和速效钾随着热解温度的升高而增加,水解性氮和有效磷随着热解温度的升高而降低。较高的热解温度在一定程度上富集了NPK养分,但降低了NP的有效性。水葫芦生物炭呈碱性且含有一定的营养元素,可作为一种较好的酸性土壤改良剂。

To provide the basis for the water hyacinth-derived biochar as a soil conditioner, takingwater hyacinth biomass as the raw material, the biochar was prepared by carbonization at 200~400 ℃, and effect of pyrolysis temperature on the physical and chemical properties and nutrient contents of the biochar. The results show that the yield decreases with the increase of pyrolysis temperature and the pH value increases with the increase of pyrolysis temperature. The total nitrogen first increases and then decreases with the increase of pyrolysis temperature, the total phosphorus, total potassium and available potassium increase with the increase of pyrolysis temperature, and the hydrolysis nitrogen and available phosphorus decrease with the increase of pyrolysis temperature. Higher pyrolysis temperatureenriches the NPK nutrients, but reduces nitrogen andphosphorus effectiveness to a certain extent. The water hyacinth-derived biochar is alkaline and contains a certain amount of nutrients to be used as a good acid soil conditioner.