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Assessing soil phosphorus status under different agronomic land use.

机译：评估不同农业土地利用方式下的土壤磷素状况。

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摘要

The study of the availability of soil phosphorus (P) to crops has been an important issue for years in different agroecosystems around the world. Because of the complex P cycling in soils this has been studied from different points of view. The study of soil P forms has been seen as a possible way to explain many processes and changes occurring in plant-soil interactions. The purpose of this research was to characterize soil P forms under different land uses and evaluate the relationship between different land use areas and the spatial distribution of soil P forms. The study was carried out in Costa Rica on a Typic Hapludand under coffee plantation (Coffea arabica ), sugar cane plantation (Saccharum spp.), and secondary forest. A modified Hedley soil P fractionation methodology was used for determining the soil P forms. Means of the relative content of P forms were 0.43% labile-Pi, 6.44% NaOH-Pi, 9.20% HCl-Pi, 32.55% extractable organic P and 51.37% residual-P. Inorganic fertilization was correlated with labile-P, NaOH-Pi, and HCl-Pi forms. In the first experiment the sugar cane yields were correlated with labile-Pi and NaOH-Pi. Organic fertilizer increased the extractable organic P suggesting an accumulation in this form. In the second descriptive study a spatial relationship was found with soil management areas. Sugar cane soil accumulated more P in HCl-Pi, extractable organic P, and residual-Pi forms. Coffee soil had the highest values in labile-Pi and NaOH-Pi that were correlated with the higher rate of fertilizer application. Secondary forest had intermediate values between these two cropped areas. The third experiment showed that under greenhouse conditions P uptake was closely related to labile-Pi and NaOH-Pi suggesting also that a sparingly available P form could be related to P uptake by plants in time. Extractable organic P and residual-P were suggested to act as a sink of the available P forms. It is concluded that under a sustainable crop production framework the adequate input of P is necessary in order to maintain the adequate nutrient supply through time.
机译：多年来，在全球不同的农业生态系统中，研究作物的土壤磷（P）的可用性一直是一个重要问题。由于土壤中复杂的磷循环，已经从不同的角度对此进行了研究。对土壤磷形态的研究被认为是解释植物与土壤相互作用中许多过程和变化的一种可能方法。这项研究的目的是表征不同土地利用下的土壤磷形态，并评估不同土地利用面积与土壤磷形态空间分布之间的关系。这项研究是在哥斯达黎加的典型Hapludand上进行的，其中包括咖啡种植园（Coffea arabica），甘蔗种植园（Saccharum spp。）和次生林。改良的Hedley土壤P分馏方法用于确定土壤P形态。 P形式的相对含量的平均值为：0.43％的不稳定Pi，6.44％的NaOH-Pi，9.20％的HCl-Pi，32.55％的可萃取有机P和51.37％的残留P。无机肥与不稳定的P，NaOH-Pi和HCl-Pi形式相关。在第一个实验中，甘蔗产量与不稳定的Pi和NaOH-Pi相关。有机肥料增加了可提取的有机磷，表明以这种形式积累。在第二项描述性研究中，发现了与土壤管理区域的空间关系。甘蔗土壤以HCl-Pi，可萃取的有机P和残留的Pi形式积累了更多的P。咖啡土的不稳定Pi和NaOH-Pi值最高，这与较高的肥料施用量相关。次生林在这两个种植区之间的价值中等。第三个实验表明，在温室条件下，磷的吸收与不稳定的Pi和NaOH-Pi密切相关，这也表明少量可利用的P形式可能与植物及时吸收P有关。建议将可萃取的有机磷和残留磷用作可用磷形式的汇。结论是，在可持续的作物生产框架下，必须有足够的P投入，以保持一段时间内充足的养分供应。

著录项

  • 作者

    Henriquez, Carlos.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Agronomy.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 79 p.
  • 总页数 79
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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