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由于~(15)N 的价格昂贵,因此在田间研究其变化时,通常只在研究小区的微区中施用。用于~(15)N 平衡研究的微区技术,必须使加入的~(15)N 基本上能全部回收,且既不抑制又不增强天然N 的变化过程。通常采用屏蔽物将微区与小区的其余部分隔开。由封闭微区所得的结果,其误差一般小于开放微区,~(15)N 回收恒定,精度较高。但是,加屏蔽物后会扰乱土壤的剖面,并限制植物生长和水分运动。本文叙述了不称再渗漏测定计的设计,以及连续五年用于已扰乱的生态系统中研究田间~(15)N 循环的结果。
Due to the high price of ~ (15) N, it is usually only applied in the micro-regions of the study area to study its changes in the field. The micro-area technology used for the equilibrium study of ~ (15) N must be able to recover all the added ~ (15) N, and neither inhibit nor enhance the change of natural N. A shield is typically used to separate the micro-zones from the rest of the cell. The results obtained from the closed micro-area, the error is generally less than the open micro-area, ~ (15) N recovery constant, higher accuracy. However, adding shielding can disrupt the profile of the soil and limit plant growth and water movement. This article describes the design of the URS and the results of a ~ (15) N cycle study in a disturbed ecosystem for five years in a row.