An on-the-spot sampling and survey method for soil nutrient cycling study
土壤养分循环实地采样调查方法

In this paper, an on-the-spot sampling and survey method for studying the soil nutrient cycling in a regional scale was discussed, with considering the principles of representation, reproducibility, randomness and timeliness. Firstly, some representative sampling areas in a definite region should be selected, based on the relevant hypsographic maps and airscapes. During the course of sampling soil and plant, a field survey related to the sampling sites should be carried out to understand the natural affecting factors on the soil nutrient cycling in a regional agro-ecosystem scale. Moreover, the farmers' basic status, crop production, and applied amount of fertilizers and their allotment should be also investigated. A case study of nutrient cycling in subtropical regions of China was carried out to approach the application of the method in the study of soil nutrient cycling in some regions.