关键词: 木麻黄林带更新, Mo的耗竭, 土壤酸化

Abstract: Beefwood (Casuarina equisetifolia) is the tree of the first importance for windbreak. sand fixation and ecological improvement on the aeolian sandy coast of Fujian. But the reforested beefwood on the slashland do not grow well and are not healthy.The study on the causes of this problem and on the countermeasures are urgently needed for safeguarding the ecological environment. The authors studied the biogeochemical characters of N, P, K, Na. Ca, Mg, Cu, Zn. Fe, Mn, B. Mo. in the beefwood shelter belt on the coast land on the Haitan Island. Fujian. It was found that the trace element Mo in the soils under beefwood forest will be exhausted with the growing of the trees becouse of the unbalanced cycle of the element. Moreover the PH values of the soils will decline, which will further reduce the availability of Mo in the soils. The Mo-exhaustion and acidization of the soils result in a decrease in the content of Mo in beefwood and leads to the unsatisfactory growth of the succeeded beefwood on the beefwood-slashland on sandy coast land in Fujian. According to above results.the authors put forward some countermeasures to preserve and promote the beefwood shelter belt and the ecological environment on the coast in Fujian. 

Key words: reforestation of beefwood shelter belt, exhaustion of Mo in soil, soil acidization