义丰溪湿地植被恢复对土壤理化性质的影响

Effects of Vegetation Restoration on Soil Nutrients in Yifengxi Wetlands

为了解义丰溪湿地植被恢复后土壤理化性质的变化情况,选取义丰溪红树林湿地为研究对象,以光滩为对照,分析不同植被恢复模式下(无瓣海桑Sonneratia apetala纯林、无瓣海桑+桐花树Aegiceras corniculatum+秋茄Kandelia obovata+卤蕨Acrostichum aureum混交林)土壤0~30 cm土层的pH、有机质、全氮、碱解氮、全磷、有效磷、全钾和速效钾等养分指标的动态变化。结果表明:植被恢复20 a后,土壤pH值显著下降,土壤有机质、全氮、碱解氮、全磷、有效磷、全钾、速效钾含量显著增加;不同恢复模式下,除pH值外,混交林土壤有机质、全氮、碱解氮、全磷、有效磷、全钾和速效钾含量均显著高于纯林(P<0.05),说明混交林模式的土壤养分含量较高,植被恢复效果较好。因此,在后续的红树林营造修复中应采用混交林模式以确保植被的恢复效果。

To understand the changes of soil physicochemical properties after vegetation restoration in the Yifengxi wetland,the mangrove wetland of Yifengxi was selected as the research object,and the tidal flat was used as the control to analyze the dynamic changes of nutrient indexes,such as pH,organic matter,total nitrogen,alkalihydrolyzed nitrogen,total phosphorus,available phosphorus,total potassium,and available potassium in the soil layer of 0-30 cm under different patterns of vegetation restoration(pure forest of S.apetala,mixed forest of Sonneratia apetala+Aegiceras corniculatum+Kandelia obovate+Acrostichum aureum).The results showed that:after the vegetation restoration,soil pH decreased significantly,and soil organic matter,total nitrogen,alkaline dissolved nitrogen,total phosphorus,effective phosphorus,total potassium and quick-acting potassium increased;under different restoration modes,except for pH,soil organic matter,total nitrogen,alkali hydrolyzed nitrogen,total phosphorus,effective phosphorus,total potassium and available potassium in mixed forests were significantly higher than that in pure forests(P<0.05),which indicated that soil nutrient contents in the mixed forest were higher,and the effect of vegetation restoration was better.Therefore,the pattern of mixed forest should be used in the subsequent mangrove restoration to ensure the effect of vegetation restoration.