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以黄土高原区刺槐、小叶杨、沙棘、沙柳、苜蓿和长芒草等6种植物凋落物为研究对象,利用2种浸提剂(水和0.01mol.L-1CaCl2)浸提了不同大小(2 mm粉碎样和1 cm长)植物凋落物,测定了其中可溶性有机碳(SOC)的含量,并利用室内培养试验(25℃)评价了可溶性有机碳的生物降解特性.结果表明,不同植物凋落物可溶性有机碳含量在4.21～76.25 g.kg-1之间,占其全碳的比例在0.99%～19.84%之间.平均来看,乔木凋落物可溶性有机物含量及其占全碳的比例大于灌木,而灌木又高于草本.经过7 d的培养,不同凋落物可溶性有机碳的生物降解率在34.7%～75.1%之间,平均56.3%,不同种类凋落物的生物降解率相比为乔木>灌木>草本.紫外及荧光光谱法测定法表明,培养结束后SOC溶液中结构较为复杂的可溶性有机物的比例呈显著上升,这与其中易降解组分的降解有关.
Six litterfalls of black locust, poplar, seabuckthorn, Salix psammophila, alfalfa and mangrove grass were used as the research object. Two kinds of extracts (water and 0.01mol.L-1CaCl2) 2 mm shredded samples and 1 cm long litter were used to determine the content of soluble organic carbon (SOC) in soil, and the biodegradation characteristics of dissolved organic carbon were evaluated by indoor culture experiment (25 ℃). The results showed that different plant litter The content of soluble organic carbon in organic matter was 4.21-76.25 g.kg-1, accounting for 0.99% -19.84% of total carbon. On average, the content of soluble organic matter in litters and its proportion of total carbon in the litter Shrubs and shrubs were higher than that of herbs.After 7 days of cultivation, the biodegradation rates of soluble organic carbon in different litter ranged from 34.7% to 75.1% with an average of 56.3%, and the biodegradation rates of different types of litter were compared with those of trees > Shrub> herb.Ultraviolet spectrometry and fluorescence spectrometry showed that the proportion of soluble organic matter with more complex structure in SOC solution increased significantly after culture, which was related to the degradation of degradable components.