摘要
为了解鲁中山地长期侧柏人工林土壤质量状况,研究不同林分密度对土壤质量的影响,为人工林的合理经营提供科学依据。以鲁中山地不同密度(1300~6400株/hm^2)侧柏人工林样地土壤为研究对象,通过野外调查和室内分析,采用因子分析法研究了长期侧柏林土壤的物理、化学、生物及综合质量,并探讨了林分密度对侧柏人工林土壤质量的影响。结果表明:供试侧柏林地土壤质量综合得分与土壤硬度、有机质含量、过氧化氢酶活性均呈显著正相关(p<0.05),与毛管孔隙度、水解氮含量、脲酶活性具有极显著的正相关关系(p<0.01)。相比之下,黑峪林场侧柏林土壤整体质量优于燕子山林场和原山林场,后两者相差不大。随林分密度增加,侧柏林土壤化学、生物和综合质量均表现出显著下降;林分密度增加会增加植物对养分的吸收,降低林内凋落物分解速率,不利于人工林系统内的养分再循环,从而导致林地土壤质量的下降。在林分密度较低(<2500株/hm^2)时,土壤质量平均得分分别是2500~3500株/hm^2,3500~4500株/hm^2和>4500株/hm^2密度组的2.11,2.02,2.27倍。鲁中山地侧柏林土壤质量受林分密度影响较大,在林分密度低于2500株/hm^2时具有较高的土壤化学、生物和综合质量。建议对鲁中山地侧柏人工林采取合理间伐措施,降低林分密度,提高林地土壤质量,以利于侧柏林可持续经营,从而更好地发挥生态效益。
In order to understand the soil quality of long-term Platycladus orientalis plantations in central mountainous area of Shandong Province,and to study the effects of different stand densities on soil quality,based on field investigation and indoor analysis,the physical,chemical,biological and comprehensive quality of the soils of Platycladus orientalis plantations with different densities(1300~6400 trees/hm^2)in central mountainous area of Shandong Province were studied by factor analysis,and the effects of stand densities on soil quality of plantations were discussed.The results showed that comprehensive scores of soil quality of Platycladus orientalis plantations were significantly and positively correlated with soil hardness,organic matter content and catalase activity(p<0.05),and had highly significant correlation with capillary porosity,available N content and urease activity(p<0.01).In comparison,average soil quality of Platycladus orientalis plantations in Heiyu forest farm was better than those in Yanzishan and Yuanshan forest farm,and the latter two differed slightly.The physical,chemical,biological and comprehensive quality scores of forest soils significantly decreased with the increase of stand density.Increasing stand density could increase plant nutrient uptake and decrease litter decomposition rate,which is not conducive to nutrient recycling in plantation system,resulting in a decline in soil quality of forest land.The average score of soil quality at low density(<2500 trees/hm^2)was 2.11,2.02 and 2.27 times as much as those at stand densities of 2500~3500 trees/hm^2,3500~4500 trees/hm^2 and>4500 trees/hm^2,respectively.These results indicated that the soil quality of Platycladus orientalis plantations was greatly affected by stand density in central mountainous areas of Shandong Province.The soil chemical,biological and comprehensive qualities were higher when the stand density was less than 2500 plants/hm^2.It is suggested that rational thinning measures should be taken to reduce stand density and improve soil quality in order to facilitate sustainable management of Platycladus orientalis plantation in central mountainous area of Shandong Province,so as to bring ecological benefits into full play.
作者
杜振宇
葛忠强
王清华
梁燕
李宗泰
刘桂民
DU Zhenyu;GE Zhongqiang;WANG Qinghua;LIANG Yan;LI Zongtai;LIU Guimin(Shandong Academy of Forestry,Jinan 250014,China)
出处
《水土保持研究》
CSCD
北大核心
2020年第2期128-135,共8页
Research of Soil and Water Conservation
基金
山东省重点研发计划(2016GNC111008)
山东省林业科技创新项目(LYCX03-2018-14).
关键词
鲁中山地
侧柏人工林
土壤质量
林分密度
central mountainous areas of Shandong Province
Platycladus orientalis plantation
soil quality
stand density
