Fig. 2From: Variations in the quantity and chemical composition of soil dissolved organic matter along a chronosequence of wolfberry plantations in an arid area of Northwest ChinaDOM contents under the corn field and five wolfberry plantations with different ages. Different lower-case letters indicate significant differences in the DOM contents between the wolfberry plantation ages (P < 0.05). The dotted line indicates the mean value calculated from the DOM data of the five wolfberry plantations with different agesBack to article page