不同土壤质地和含水率对炭基肥料氮素矿化的影响

为了探究土壤特性对炭基肥料氮素矿化的影响,采用室内培养和大田小区试验,分析了炭基肥在不同土壤质地(砂质壤土、粉砂质壤土、黏土)及含水率(80%、60%、40%田间最大持水量)条件下,氮素矿化动态变化特征。结果表明:在室内培养条件下,对于不同土壤质地,炭基肥在砂质壤土条件下矿化势最高,其次为黏土,最低的为粉砂质壤土;对于不同田间持水量,在粉砂质壤土条件下,炭基肥矿化势最高的为80%田间最大持水量(80%SMC),其次为60%SMC,最低的是40%SMC;在砂质壤土和黏土条件下,炭基肥的矿化势均表现为60%SMC> 80%SMC> 40%SMC。培养状态下粉砂质壤土、砂质壤土、黏土条件下最大氮素有效性分别是34.12%、56.31%、41.14%,而在大田条件下,炭基肥单季氮素最大矿化率在粉砂质壤土、砂质壤土、黏土3种土壤质地下分别是50.61%、32.27%、34.29%。

Effects of Soil Texture and Moisture on Nitrogen Mineralization Rate of Biochar-based Fertilizer

In order to study the effect of soil texture and water content on nitrogen mineralization of biochar-based fertilizer, an indoor incubation and field experiment were conducted to study the characteristics of nitrogen mineralization under different soil textures (sandy loam, silty loam, clay) and soil moistures (80%, 60%, 40% of SMC). The results showed that the mineralization potential of the sandy loam was the highest, followed by clay, and silty loam was the lowest; The mineralization potential was in an order of 80%SMC>60%SMC>40%SMC for silty loam, 60%SMC>80%SMC>40%SMC for sandy loam and clay, the maximum nitrogen availability were 34.12% for silty loam, 56.31% for sandy loam, 41.14% for clay, respectively. The nitrogen availability of biochar-based fertilizer in single season under field conditions under three soil types the sand loam clay were 50.61% for silty loam, 32.27% for sandy loam and 34.29% for clay.