土壤退化时间序列的构建及其在我国土壤退化研究中的意义

我国土壤退化发生广、发展快,后果严重,很多问题亟待解决,加大其研究力度势在必行。显而易见,人们对土壤特性与土壤退化过程了解得越详细,对土壤退化的评估与防治也会越好。因此迫切需要建立大量土壤退化时间序列来明确土壤退化过程中时间因素的作用并帮助人们正确理解和认识土壤退化与人为作用之间的关系。为了得到可靠的结果,土壤退化时间序列的建立需包括起始土壤相似性判定与退化土壤绝对或相对年龄的验证两个重要过程。本文详细论述了土壤退化时间序列的构建过程及应注意的问题,并探讨了土壤时间序列在我国土壤退化研究中的意义,旨在为土壤退化时间序列的正确建立与应用提供较为详尽的参考。

Soil Degradation Chronosequence and Their Significance in Soil Degradation Study of China

Due to climate changes, human activities and excessive utilization, China is one of the regions in which significant soil degradation occurs and develops and many problems need to be solved in recent decades. Obviously, the more detailed were acquired in soil degradation processes, the better would be done in soil degradation assessments and soil conservation. Thus, various soil degradation chronosequences were needed to investigate how soil degradation change with time and the concomitant agricultural implications. To obtain reliable results, the establishment of soil degradation chronosequences must consist of two critical processes, i.e. quantitative identification of original soil uniformity between and within profiles of the chronosequence, and identification of age of the degraded soils with numerical or geochronometric dating methods and surface exposure (relative) dating methods. This study thus provided a methodology that can help improve our understanding of the constructing procedures of soil degradation chronosequences and such enhanced understanding may contribute to soil degradation studies, with a view to providing detailed references for correct construction of soil degradation chronosequences and better understanding the effects of the time factor on soil degradations.