华北落叶松人工林土壤固氮酶活性特征与影响因素  

Characteristic and influencing factors of soil nitrogen-fixing enzyme activity in Larix principis-rupprechtii

作　　者：崔红娜 杨柳 李倩茹[2] 李校 许中旗[1] 贾彦龙[1] CUI Hongna;YANG Liu;LI Qianru;LI Xiao;XU Zhongqi;JIA Yanlong(College of Forestry,Hebei Agricultural University,Baoding 071000,China;College of Economics and Management,Hebei Agricultural University,Baoding 071000,China;Mulanweichang National Forestry Administration of Hebei Province,Weichang 068450,China)

机构地区：[1]河北农业大学林学院,河北保定071000 [2]河北农业大学经济管理学院,河北保定071000 [3]河北省木兰围场国有林场,河北围场068450

出　　处：《林业与生态科学》2023年第3期292-299,共8页Forestry and Ecological Sciences

基　　金：河北省自然科学基金(C2018204096)。

摘　　要：为了解燕山北部山地华北落叶松人工林土壤固氮酶活性特征,以该地区华北落叶松为研究对象,采用乙炔还原法测定了森林表层土壤固氮酶活性,并测定其土壤养分含量。结果表明,中幼龄华北落叶松人工林土壤固氮酶活性值呈正偏态分布,范围是0.1~0.6 nmol/(g·h),不同林龄固氮酶活性均值排序为10年>30年>20年;土壤固氮酶活性整体上与全氮、全磷、有效铁和有效磷呈极显著负相关,与全铁呈极显著正相关(P<0.01);进一步分析发现,当酶活性较高时,其主要受到铁元素的促进作用,当酶活性较低时,其主要受到氮元素的抑制作用。本研究结果表明,林龄不是中幼龄华北落叶松人工林土壤固氮酶活性的主要影响因素,氮元素和铁元素的共同作用决定了固氮酶活性的变异。In order to clarify the soil nitrogen-fixing enzyme activity and its influencing factors,the middle and young age Larix principis-rupprechtii plantations widely distributed in the northern Yanshan Mountains were investigated.The nitrogen-fixing enzyme activity and nutrient content of the surface soil(0-10 cm)were measured by acetylene reduction method.The results showed that the soil nitrogen fixation enzyme activity values of young and middle-aged larch plantation forests showed a positive skewness,ranging from 0.1 to 0.6 nmol C 2H 4/(g·h),where the mean values of nitrogen fixation enzyme activity were ranked as 10 years>30 years>20 years in different forests;The soil nitrogen fixationn enzyme activity as a whole was highly significantly negatively correlated with total nitrogen,total phosphorus,available iron and available phosphorus,and positively correlated with total iron(P<0.01);Further analysis revealed that when the enzyme activity was high,it was mainly promoted by Fe.When it was low,it was mainly inhibited by N.The results of the present study indicated that stand age was not an influencing factor of soil nitrogen-fixing enzyme activity in young and middle-aged larch plantations,and the combined effect of nitrogen and iron determined the variation of nitrogen-fixing enzyme activity.

关 键 词：华北落叶松人工林 自生固氮 固氮酶活性 土壤养分 

分 类 号：S714.2[农业科学—林学]