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通过对九龙江口秋茄红树林人工模拟凋落叶自然分解过程中落叶腐解与落叶腐解微生物变化的研究,结果表明: 1.随落叶分解进程,落叶腐解微生物数量有了显著地变化;就细菌、放线菌和丝状真菌等三大类群微生物数量来看,整个过程以细菌占绝对优势,其数量在200×10~4-8800×10~4个/克干重,占三大类群微生物总数量的96-99％以上。这表明细菌是落叶分解起主要作用的微生物类群。 2.微生物各生理类群中,以氨化细菌数量最多,在26×10~4-180×10~4个/克干重;而亚硝化细菌,反硝化细菌及纤维分解菌分别仅在0.03×10~4-0.24×10~4,0.03×10~4-0.10×10~4及1.14×10~4-7.33×10~4个/克干重。表明氨化细菌是有机物质无机化的主要生理类群。并且氨化作用、亚硝化作用和反硝化作用是同时进行;并随落叶腐解周期的延长(半腐解周期内)而加强,唯强度不一,它反映了该生境干、湿交替的沼泽化特点。纤维分解菌数量的变化较特殊,在落叶腐解第2周时,有了明显增多,至第4周达全周期的最高值,而以后周期都与初始叶面纤维分解菌的数量相(?),甚至减少。从微生物活性的变化测定结果来看,与上述微生物生理类群的变化特点是相一致的。 3.在该生境中,落叶腐解速度是很快的,当落叶入土1周后将近1/4有机物被腐解,至第6周达半腐解状态。随落叶腐解有机物质无机化程度的加速,残叶中单位叶重的可溶性总糖含量和全磷量都明显地减少,而全氮含量显著地增加。
Through the study of the decay of decayed leaf and the decayed leaf decay microorganisms during the natural decomposition process of artificial mulberry litter in Jiulongjiang estuary mangrove, the results showed that: 1. The number of decayed decayed microorganisms changed significantly with decolon decomposition process; , Actinomycetes and filamentous fungi and other three groups of microorganisms, the whole process of bacteria accounted for the absolute advantage, the number of 200 × 10 ~ 4-8800 × 10 ~ 4 / g dry weight, accounting for three groups of micro-organisms The total number of 96-99% above. This shows that the bacteria are the microbial groups that play a major role in the decollement. 2. The number of ammoniated bacteria in each physiological group of microorganisms was the highest at 26 × 10 ~ 4-180 × 10 ~ 4 / g dry weight, while that of nitrosated bacteria, denitrifying bacteria and fibrolytic bacteria were only 0.03 × 10 ~ 4-0.24 × 10 ~ 4, 0.03 × 10 ~ 4 ~ 0.10 × 10 ~ 4 and 1.14 × 10 ~ 4-7.33 × 10 ~ 4 / g dry weight. Ammonia bacteria showed that the organic matter is the main physiological group. And the ammonification, nitrification and denitrification were carried out at the same time, and strengthened with the decolonization cycle (half-decomposing cycle) Features. The number of fibrolytic bacteria changed more specifically. When the decoloring was decomposed at the second week, it increased obviously to reach the highest value of the whole cycle in the fourth week, Even reduce. Changes in microbial activity measurement results point of view, with the microbial physiological characteristics of the group is consistent with changes. In this habitat, deciduous leaf decay rate is very fast, when the deciduous soil into the soil after 1 week, nearly 1/4 of organic matter is decayed, to 6 weeks reached half-decomposed state. With the accelerated decomposition of organic matter by deciduous leaves, the total soluble sugar content and total phosphorus content per unit leaf weight in the residual leaves decreased significantly, while the total nitrogen content increased significantly.