在福建省东山县滨海沙地,对连栽条件下木麻黄林地根际和非根际土壤化学性质和酶活性进行了对比研究。结果表明:二代木麻黄林的根际和非根际土壤PH值均小于一代林,表明木麻黄连栽引起根际土壤酸化;根际土壤有机质、CEC值、水解性总酸度、全氮、水解氮、速效钾、交换性Mg2+和CA2+含量随着木麻黄连栽而降低,且心土层(20~40CM)差异更大,但土壤全磷、全钾变化不大;与一代林相比,二代木麻黄根际土壤磷酸酶和过氧化物酶活性减弱,多酚氧化酶活性增大,脲酶无明显变化。第二代木麻黄林地根际土壤养分的消耗、生物活性的降低和有毒物质的累积等,可能造成土壤肥力衰退,林木生长受阻。The comparative trial was conducted to study the chemical properties and enzyme activities of the rhizosphere and non-rhizosphere soil supporting the first and second generation Casuarina equisetifolia plantation on coastal sand at Dongshan County of Fujian Province.The results showed that the pH value in rhizosphere and non-rhizosphere soil in the second generation plantation was lower than the first generation plantation,indicating that the multi-rotation plantation increased the acidity of rhizosphere soil.The contents of organic matter,CEC,Hydrolytic acidity,total N,Hydrolytic N,available K,exchange Mg2+ and Ca2+ in rhizosphere soil of second generation plantation was also lower than that of the first generation,and the difference in 20～40cm depth of soil was obvious,but there was no significant difference for total P and total K.Compared with the first generation,the activities of phosphataese and peroxidase in rhizosphere soil of second generation were decreased,while the activities of polyphenol oxidase were increased,but there was no obvious change on activity of urease.The soil fertility would decline and forest growth decrease in multi-rotation Casuarina equisetifolia plantation,due to the soil nutrient consumption,biochemical activity reduction and toxic substance accumulation.国家自然科学基金项目(41176092);国家“十一五”科技支撑计划(2009BADB2B0302);国家林业局南方山地用材林培育重点实验室、福建省森林培育与林产品加工利用重点实验室资助项
