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当前位置: 首页 > 文章 > 红壤的不同物理条件对磷素扩散的影响 土壤学报 1984,21 (1) 1-9
Position: Home > Articles > THE EFFECT OF DIFFERENT PHYSICAL CONDITIONS OF RED EARTHS ON THE PHOSPHORUS DIFFUSION Acta Pedologica Sinica 1984,21 (1) 1-9

红壤的不同物理条件对磷素扩散的影响

作  者：
许绣云;姚贤良
单  位：
中国科学院南京土壤研究所
摘  要：
溶质在土壤中的移动涉及土壤中物理、化学和生物学过程。就物理学而论主要与孔隙几何特征及容积含水量密切相关。因此,这一问题是土壤物理学中重要的研究课题之一。
译  名：
THE EFFECT OF DIFFERENT PHYSICAL CONDITIONS OF RED EARTHS ON THE PHOSPHORUS DIFFUSION
作  者：
Xu Xiuyun Yao Xianliang(Institute of Soil Science, Academia Sinica, Nanjing)
摘  要：
The present paper deals with the influence of different physical conditions of three typical red earths in China on the phosphorus self-diffusion. Experiment was made under three moisture levels including about 17,22 and 28% for the latosol; 15,20 and 25% for the lateritic red earth; 15,20 and 25% for the red earth with low fertility; 23,27 and 30% for the uncultivated red earth and four grades of soil bulk densities being 1.20, 1.35, 1.50 and 1.65 g/cm~3 except those of uncultivated red soil. The phosphorus self-diffusion rate was determined by the method of diffusion halfceU using ~(32)P labelled KH_2PO_4 solution. The preliminary, results showed that both the soil moisture and bulk density had significant influence on P-diffusion (D) of all the investigated red earths. The greatest was the influence of soil moisture condition on the P-diffusion under appropriate condition of bulk density (1.35 g/cm~3 for the lateritic red soft), but it decreased remarkably with the increase in bulk density up to 1.65 g/cm~3.The critical value of bulk density to P-diffusion means that the P-diffusion is sharp changed from increase to decrease under that value. It was shown by the experiment that the critical value of bulk density to P-diffusion was dependent upon soil types and moisture conditions. For the latosol, no critical value of bulk density had been found, the rate of Pdiffusion declined gradually along with the increase of bulk density from 1.2 to 1.65 g/cm~3 being not influenced by the soil moisture. For the lateritic red earth, the critical value of bulk density was affected by soil moisture; it was about 1,35 g/cm~3 under higher soil water content (25%) and 1.5g/cm~3 under lower soil water content (14.5%). The critical value of bulk density of red earth was similar to lateritic red earth; and it amounted to 1.29 g/cm~3 for the uncultivated red earth and with less influence of soil moisture.From results mentioned above, it seems that the protection of water stable aggregate in latosol with clayey texture from deterioration and compacting surface soil of lateritic red earth with coarse texture and red earth are favorable for the increase of the phosphorus movement in soil, and consequently for promotion of the efficiency of phosphorus fertilizer in tropic and subtropic red earths. From viewpoint of management, in order to increase the productivity of tropic soils, the more attention must be paid not only to the chemical, but also to the physical measures.

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