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土壤有机质一般包括植物、动物和微生物的残体与产物,按其不同的状态和分解程度大体分为尚未分解的,正在分解的,被微生物分解后的产物(如土壤腐殖质)等三种。有机质含有植物生长需要的各种养分,同时它有较大的吸收能力,对保持和调节土壤水分、养分有重要作用,能改善土壤的物理性状,促进土壤团粒结构的形成。有机质中的养分,可以供给土壤微生物利用,从而增强微生物活动,促进有机态养分分解,以供给植物吸取利用,有机质的增加与积累,可促进土壤熟化、提高地力。因此,土壤含有机质多少,可以说明它的肥沃程度。 (一)分析原理用过量的标准当量氧化剂(0.4N重铬酸钾在浓硫
Soil organic matter generally includes residues and products of plants, animals and microorganisms, which are roughly divided into three types, which are not decomposed, are decomposed, and are decomposed by microorganisms (such as soil humus) according to their different states and degrees of decomposition. Organic matter contains a variety of nutrients required for plant growth, and at the same time, it has greater absorption capacity and plays an important role in maintaining and regulating soil moisture and nutrients. It can improve the physical properties of soil and promote the formation of soil aggregate structure. The nutrients in organic matter can be used by soil microorganisms to enhance the activity of microorganisms and promote the decomposition of organic nutrients for plant utilization and organic matter accumulation and accumulation, which can promote the soil ripening and improve the soil fertility. Therefore, how much soil contains organic matter, can explain its fertility. (A) Analysis Principle Excess standard equivalent oxidant (0.4N potassium dichromate in concentrated sulfur