Relationship between the Movement of Soil Water and Nitrogen in the Volcanic Ash Soil

钾硝酸盐被散布在实验场上（细分为65厘米× 150厘米），在100克牛顿/米D12克D1中，按顺序划分土壤水和硝酸盐的运动之间的相互关系，以及硝酸盐的运动和Leaching从十月五日研究， 1998年至十月五日， 1999年。The soil was collected to 210 cm in the auger （ the 20 mm diameter ） for the 2 ~ 4 week every and every 15 cm depth。氨酰胺硝酸盐和硝酸盐的数量是由10%的KCl土壤提取物产生的。土壤水潜力在每小时20厘米深度测量到170厘米的张力计。而且，根据TDR方法在每30厘米的1小时内测量到90厘米的体积水量。“雨水的数量被记录在一个实验中。”结果如以下所示。（1） Though the TDR方法不能应用于这个实验场，它有可能获得土壤水的变化，因为土壤水的增加，雨水的数量几乎同意。（2）土壤水中的增加并不总是显露出来，而这是一个例子，它只是压力的传播，只在雨水中的压力潜力的增加。（3） Zero flux plane in experimental field is located in the vicinity of the 110 cm depth。（4）雨水在许多情况下消失的最多，在几天内从土壤层消失到90厘米深，20岁后的大多数雨水消失。（5）在这种情况下，雨水的数量和土壤水的数量比在这种情况下，有很多雨水的数量和土壤水的数量主要消失，更多的是从土壤层转移到土壤层的氮素。这是因为土壤水移动宏观的原因，主要是因为那里有很多土壤水，而土壤水移动微观的时候有少量的土壤水。这就是说，这就是为什么说，硝酸盐在微观上被保留得比宏观上的大孢子多。

Potassium nitrate was sprayed over experimental field ( subdivision of 65cm × 150cm ) of the bare field condition in 100gN/mィイD12ィエD1 in order to clarify mutual relationship between movement of soil water and nitrogen, and movement and leaching of the nitrogen were studied from October fifth, 1998 to October fifth, 1999. The soil was collected to 210cm in the auger ( the 20mm diameter ) for the 2 〜 4 week every and every 15cm depth. The quantity of ammonia nitrogen and nitrate nitrogen was obtained by the 10%KCl soil extract. Soil water potential was measured from 30cm to 170cm by the tensiometer in hour by every 20cm depth. And, the volumetric water content was measured to the 90cm depth by the TDR method in 1 hour by every 30cm. Amount of rainfall was recorded throughout the experiment. Results are as follows.(1) Though the TDR method can not be applied to this experimental field, it is possible to obtain amount of change of soil water, because amount of increase of soil water and amount of rainfall agree almost.(2) The increase in the soil water is not always shown, and there is a case in which it is the propagation of the pressure only on the increase of pressure potential in the rainfall time.(3) Zero flux plane in experimental field is located in the vicinity of the 110cm depth.(4) Most disappears on the rain water in many cases from soil layer to the 90cm depth in a few days, and all most of the rain water disappear after 20th.(5) The case that amount of rainfall and soil water were less than the case in which there are many amount of rainfall and soil water mainly disappeared more on the transfer of the nitrogen from the soil layer of the 210cm depth. This supposed for the reason that soil water moves macropore mainly when there is much soil water and soil water moves micropore when there is little soil water. It is considered that that is to say, the nitrogen is mainly retained than the macroscopic pore in the micropore.