不同有机肥料对土壤生物活性有机质组分的动态影响

研究了红砂土中加入稻草秸秆和猪粪后土壤中微生物生物量碳、水溶性有机碳、溶解性酚等活性有机质组分的动态变化。有机肥处理一周后 ,微生物生物量碳、水溶性有机碳、溶解性酚等都达到最高值。随着培养时间的推移 ,不同处理的土壤中微生物生物量碳和水溶性有机碳含量都逐渐下降 ,而溶解性酚含量在整个培养过程中基本保持不变。相关分析表明 ,土壤中微生物生物量碳与水溶性有机碳和溶解性酚的含量都呈极显著正相关 ,而水溶性有机碳和溶解性酚的含量不相关。

Effects of different organic manure on biologically active organic fractions ofsoil

Dynamic changes of biologically active organic fractions of soil such as microbial biomass carbon (SMBC), water soluble organic carbon(WSOC) and dissolved phenols(DP) in a red sand soil as affected by rice straw (RS) and pig manure (MS) were studied. All of these soil organic fractions reached the highest value at seven day after addition of organic manures. Soil microbial biomass and water soluble organic carbon in different treatments decreased gradually with incubation time. However, the contents of dissolved phenols in all treatments nearly keep constant during the whole incubation period. Correlation analysis showed that soil microbial biomass had a significantly positive correlation with both water soluble organic carbon and dissolved phenols,and there was no significant correlation between water soluble organic carbon and dissolved phenols.