Yin Yun-feng, Cai Zu-cong, Lu Jia-long
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
J Environ Sci (China). 2005;17(6):917-20.
Although numerous studies about the nature and turnover of soil organic matter(SOM) in light and heavy fractions(LFOM and HFOM, respectively) have been made, little information is available in relation to the relationship between LFOM and HFOM, and no attempts have been made to quantify a general relationship between LFOM and HFOM for agricultural soils under field condition. Our hypothesis is there may be an inherent relationship between LFOM and HFOM for agricultural soils under certain unaltered management practices for a long period, to this end, we therefore studied typically soils taken from different parts in China by using a simple density fractionation procedure. The results indicated that LFOM was positively correlated with LFOM/HFOM ratio for three typical soils. This information will be of particular use not only in deepening our understanding of the dynamics of SOM fractions but also in evaluating the potential of agricultural soils to sequestrate C under different management practices in a long term.
尽管针对土壤轻组和重组有机质（分别简称为LFOM和HFOM）的性质及周转开展了大量研究，但关于LFOM和HFOM之间关系的信息却很少，而且尚未有人尝试量化田间条件下农业土壤中LFOM和HFOM之间的普遍关系。我们的假设是，在长期特定未改变的管理措施下，农业土壤中LFOM和HFOM之间可能存在内在关系。为此，我们采用简单的密度分级程序，对取自中国不同地区的典型土壤进行了研究。结果表明，三种典型土壤的LFOM与LFOM/HFOM比值呈正相关。这些信息不仅对于深化我们对土壤有机质组分动态的理解具有特殊作用，而且对于长期评估不同管理措施下农业土壤的碳固存潜力也具有特殊作用。
