九龙江口秋茄红树林恢复对底质磷的影响

Effect of Kandelia candel mangrove restoration on sediment phosphorus in Jiulongjiang estuary

以光滩为对照,分别在白礁选取5、6、8a生秋茄(Kandelia candel)人工林以及天然秋茄林为样地,在草埔头选取20a生和44a生秋茄人工林为样地,比较分析了福建九龙江口秋茄红树林恢复对底质总磷和有效磷的影响.结果表明:白礁和草埔头秋茄人工红树林的总磷和有效磷含量随红树林恢复时间的增加而增高.白礁天然秋茄林和草埔头秋茄人工林的总磷随底质深度增加而减少,有效磷在中下层含量较高.潮位对草埔头总磷有显著影响,由外滩到内滩,其总磷含量逐渐增加.九龙江口秋茄红树林早期恢复阶段的底质总磷和有效磷缺乏,5a生秋茄人工林底质总磷和有效磷分别为0.68g/kg和2.99mg/kg.

Effects of the restoration of Kandelia candel mangroves on soil total phosphorus and available phosphorus were investigated in Jiulongjiang estuary. At Baijiao, one five-year old replanted forest, one six-year old replanted forest,one eight-year old replanted forest, one nature mature forest and one plot of barren beach were selected. Meanwhile, one twenty-year old replanted forest, one forty-four-year old replanted forest and one barren beach plot at Caoputou were selected. Results indicated that the total and available phosphorus increased with restoration time at Baijiao and Caoputou. Total phosphorus decreased with sediment depth, while available phosphorus was usually high in mid and lower layers at Baijiao and Caoputou. Tide level had remarkable effects on the distribution of total phosphorus resulting in lower phosphorus content in the outer fiat than in the inner. In Jiulongjiang estuary, the sediments in replanted K. canclel mangroves were both short of total and available phosphorus, especially during the early phases of mangrove development,which were 0. 68g/kg and 2. 99mg/kg respectively in five-year old replanted forest.