Keywords: 
• coastal sandy land /
• tree species /
• caloric value /
• nutrient element /
• correlation /

Abstract: The objective is to examine and compare the allocation patterns of caloric and elemental contents for three forestation species on coastal sandy land，and to summarize correlations between caloric values and elememtal contents. In July of 2010，three forestation species （Pinus elliottii，Acacia crassicarpa and Casuarina equisetifolia） were sampled from a coastal sandy land in Dongshan County，Fujian Province. All organs of each tree species were harvested. The gross caloric values （GCV） were measured by oxygen bomb calorimeter. Ash，and the contents of C，N，P，K，Ca and Mg were analyzed. The results showed that the mean gross caloric values and the mean ash free caloric values decreased in the following order：P. elliottii （20.96 kJg－1，21.41 kJg－1）A. crassicarpa （20.97 kJg－1，21.35 kJg－1）＞C. equisetifolia （20.18 kJg－1，20.69 kJg－1）. The mean C content in P. elliottii （491.548 gkg－1） was higher than in A. crassicarpa （471.773 gkg－1） and C. equisetifolia （460.042 gkg－1）. The N，P，K，Ca，and Mg content in different organs of these three species were as follows：leaves＞branches＞barks＞roots＞stems. The mean content of N，P，K，Ca，and Mg of A. crassicarpa were the highest，then was C. equisetifolia，P. elliottii was the lowest. Gross caloric value was significantly correlated with Mg content （r =0.600，P ＜ 0.05） and with content of N （r = 0.641，P ＜ 0.01），P （r = 0.879，P ＜ 0.01），and K （r = 0.726，P ＜ 0.01）. Ash content was significantly correlated with P content （r = 0.673，P ＜ 0.01） and was significantly correlated with content of K （r = 0.524，P ＜ 0.05），Ca （r = 0.523，P ＜ 0.05），and Mg （r = 0.639，P ＜ 0.05）. Compare to C. equisetifolia，P. elliottii had the highest carbon content and the lowest elemental content，meanwhile，A. crassicarpa could fixed nitrogen through rhizobium to produce fertilizers and improve soil. So P. elliottii and A. crassicarpa can be used as alternative tree species in coastai sandy land.［Ch，4 tab. 15 ref.］