摘要
【目的】研究科尔沁沙地不同林龄油松人工林地土壤养分变化及酶活性变化过程,为该地区植被恢复提供参考依据。【方法】以流动沙地为对照(0 a),选择固沙18、34、48、56 a油松人工林地为研究对象,进行土壤样品分层采集,用于土壤化学性质及酶活性的测定;采用冗余分析方法,探究不同林龄土壤酶活性变化过程及其与土壤理化性质之间的关系。【结果】与对照相比,有机质、全氮、全磷、速效钾含量随林龄增加而显著增加,但全钾、速效氮则无明显变化。不同林龄0~2 cm土层过氧化氢酶、脱氢酶、脲酶、中性磷酸酶、中性蛋白酶活性随林龄增加均显著高于对照并具有明显表聚现象,蔗糖酶活性在18 a时活性最高,随后下降。林龄、土层及其交互作用均显著影响土壤酶活性。冗余分析结果表明土壤全氮、全钾、速效磷、速效钾与土壤脲酶、脱氢酶、过氧化氢酶均呈极显著正相关关系;7种化学性质在前两轴累积解释土壤酶活性的76.06%,对土壤酶活性影响重要性排序为全氮>速效磷>全钾>有机质>全磷>速效钾>速效氮,全氮是影响土壤酶活性差异的关键因子。【结论】油松人工林能有效改善沙地土壤肥力,提高土壤酶活性,并随林龄增加改善作用增强;同时人工造林56 a时,油松人工林地未出现衰退现象。
【Objective】To study the change process of soil nutrients and enzyme activities in different forest ages of Pinus tabulaeformis in Horqin sandy land,so as to provide a reference for vegetation restoration in this area.【Method】Taking the shifting sandy land as the control(0 a),the sand-fixing 18,34,48,56 a Chinese pine plantation land was selected as the research objects,and the soil samples were collected in layers for the determination of soil chemical properties and enzyme activities.The redundancy analysis method was used to explore the change process of soil enzyme activity at different forest ages and its relationship with soil physical and chemical properties.【Result】Compared with the control,the contents of organic matter,total nitrogen,total phosphorus and available potassium increased significantly with the increase of stand age,but total potassium and available nitrogen had no obvious changes.The activities of catalase,dehydrogenase,urease,neutral phosphatase and neutral protease in the 0-2 cm soil layer under different forest ages were significantly higher than that of the control with obvious superficial polymerization,sucrase activity was the highest at 18 a and then decreased.Stand age,soil layer and their interaction significantly affected soil enzyme activity.Redundancy analysis showed that soil total nitrogen,total potassium,available phosphorus,available potassium and soil urease,dehydrogenase,and catalase all had extremely significant positive correlations.The accumulation of 7 chemical properties in the first two axes explained 76.06%of soil enzyme activity,and the order of importance to soil enzyme activity was total nitrogen,available phosphorus,total potassium,organic matter,total phosphorus,available potassium,and available nitrogen.Total nitrogen is the key factor affecting the difference of soil enzyme activity.【Conclusion】The Chinese pine plantation can effectively improve the sandy soil fertility and soil enzyme activity,and the improvement effect will increase with the increase of the forest age.
作者
高海燕
杨制国
张胜男
黄海广
闫德仁
GAO Haiyan;YANG Zhiguo;ZHANG Shengnan;HUANG Haiguang;YAN Deren(Key Laboratory for Sandy Land and Desert Ecosystem and Ecological Engineering of Inner Mongolia Autonomous Region,Inner Mongolia Academy of Forestry,Hohhot 010010,Inner Mongolia,China;Key Laboratory of State Forestry Administration on Sandy Land Biological Resources Conservation and Cultivation,Inner Mongolia Academy of Forestry,Hohhot 010010,Inner Mongolia,China;Inner Mongolia Duolun Hunshandake Sand Ecosystem Research Station,Xilin Gol League 027300,Inner Mongolia,China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2024年第2期108-117,共10页
Journal of Central South University of Forestry & Technology
基金
内蒙古自治区科技计划项目(2021GG0360)
内蒙古自治区林业和草原局科研能力提升项目。
关键词
科尔沁沙地
油松人工林
土壤酶活性
土壤化学性质
Horqin sandy land
Pinus tabuliformis plantation
soil enzymes activities
soil chemical properties
