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蚯蚓粪的NH_4^+吸附等温线与DTA曲线特征 被引量:6

NH_1^+ ADSORPTION ISOTHERMS OF EARTHWORM CASTS AND THEIR CHARACTERISTICS OF DTA CURVE
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摘要 本文研究了南宁三种饲料人工饲养的蚯蚓的蚯蚓粪(简称蚓粪)对NH_4^+的吸附等温线,并与武功的蚓粪作比较。蚓粪对NH_4^+的吸附一般大于土壤对NH_4^+的吸附,南宁蚓粪又大于武功蚓粪。蚓粪吸附NH_4^+量的多少与其中有机质含量有关,特别与其中中温放热反应的有机质(即易于分解的有机质)呈正相关。不同饲料组成对蚓粪吸NH_4^+等温线的参数影响不同。在Langmuir方程中与结合能常数有关的K值的次序为:纯牛粪>牛粪+烂橙果>牛粪+草菇培养基脚料而与最大吸附量有关的M值的次序为:牛粪+烂橙果>纯牛粪>牛粪+草菇培养基脚料而以K与真M的总的效应表示的b值的次序为:纯牛粪>牛粪+烂橙果>牛粪+草菇培养基脚料因此,牛粪不仅是一个良好的蚯蚓饲料,并且可使蚓粪具有良好的保NH_4^+力,成为一种有效的吸附剂。 NH_4^+ adsorption isotherms of wormcasts obtained from earthworms fed with three different fodders in Nanning were stucied, and compared with the characteristics of those of the wormcasts from Wugong. The NH_4^+ adsorption capacity of wormcasts was ordinarily larger than that of soils. The NH_4^+ adsorption capacity of Nanning casts was larger than that of Wugong. The amount of NH_4^+ adsorbed by wormcasts seemed to be related to the organic matter contained in wormcasts, espacially to the organic matter of middle temperature exothermic peak in DTA curve. The parateters of NH_4^+ adsorption isothems of wormcasts from different fodders were different. In Langmuir equation, the constants K for NH_4^+ adsorption isotherms of wormcasts derived from different fodders which were related to the bonding energy, were in the order of pure cattle manure>cattle manure+spoiled orange>cattle manure+residue of straw mushroom culture medium. While the parameters M, which were the adsorption maximum or total amount of solute of being adsorbed, were in the order of cat le manure+residue of straw mushroom culture medium>pure cattle manure>cattle manure+spoiled orange. The parameters b, which were indicated by the total effect of K and M, were in the order of pure cattle manure>cattle manure+spoiled orange>cattle manure+residue of straw mushroom culture medi um. It is indicated that the cattle manure can not only be used as a good fodder for earthworms, but also be favorable for the high adsorption of NH_4^+ by wormcasts,thereby forming a valuable adsorbent in soil.
出处 《土壤学报》 CAS CSCD 北大核心 1990年第1期94-103,共10页 Acta Pedologica Sinica
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参考文献3

  • 1谢鹏,土壤学报,1988年,25卷,2期,175页
  • 2蒋剑敏,土壤,1985年,17卷,4期,169页
  • 3虞锁富,土壤学报,1982年,19卷,3期,248页

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