西南喀斯特地区马尾松人工林土壤酶活性和GRSP含量特征分析  

Characteristics of Soil Enzyme Activity and GRSP Content inPinus massoniana Plantation in Karst Area of Southwest China

作　　者：宋雪红 郑睿 武燕 SONG Xuehong;ZHENG Rui;WU Yan(School of Biological Science,Guizhou Normal University,Guiyang 550018,China;Guizhou Provincial Key Laboratory of Forest Fire Ecology and Management,Guiyang 550018,China)

机构地区：[1]贵州师范学院生物科学学院,贵州贵阳550018 [2]贵州省高等学校林火生态与管理重点实验室,贵州贵阳550018

出　　处：《黑龙江农业科学》2024年第11期51-58,共8页Heilongjiang Agricultural Sciences

基　　金：大学生创新创业训练计划项目(202314223025);贵州省科技计划项目(黔科合基础-ZK〔2023〕一般282);贵州师范学院校级博士基金项目(2020BS026);贵州省教育厅平台项目(〔2022〕051号)。

摘　　要：为科学掌握西南喀斯特地区土壤环境特征,进而制定合理的人工林管理措施,促进喀斯特生态脆弱区土壤肥力恢复,选取贵州省遵义市凤冈县的马尾松人工林土壤为研究对象,分析中龄林、近熟林和成过熟林3种龄组及土层变化对土壤酶活性、球囊霉素相关土壤蛋白(GRSP)含量的影响,并分析二者与土壤物理性质及土壤养分的关系。结果表明,(1)龄组变化对土壤酶活性有显著影响,0~20 cm土层4种土壤酶活性均随林龄的增加而升高,该土层马尾松人工林土壤蔗糖酶活性在中龄林、近熟林和成过熟林中分别为8.85,10.42和11.98 mg·(g·d)-1,磷酸酶活性分别为0.54,0.57和0.69 mg·(g·h)-1,过氧化氢酶活性分别为2.58,3.15和4.40 mL·(g·min)-1,成过熟林土壤蔗糖酶活性显著高于中龄林,成过熟林土壤磷酸酶和过氧化氢酶活性均显著高于中龄林和近熟林。(2)土层变化对土壤磷酸酶和过氧化氢酶活性有显著影响,相同龄组下,中龄林和近熟林土壤磷酸酶活性表现为20~40 cm土层显著低于0~20 cm土层,分别下降29.63%和50.88%;成过熟林土壤过氧化氢酶活性表现为20~40 cm土层显著低于0~20 cm土层25.00%。(3)0~20 cm土层和20~40 cm土层EE-GRSP和T-GRSP含量在3种龄组间大小关系均表现为中龄林>成过熟林>近熟林,其中0~20 cm土层中龄林T-GRSP含量为3.56 mg·g-1,显著高于近熟林52.14%。(4)相关性分析结果表明,影响土壤酶活性的主要因素有容重、孔隙度、土壤有机碳、全氮、全磷和碱解氮含量,而GRSP含量主要受土壤物理性质的影响。综上,龄组变化对马尾松人工林土壤酶活性产生了显著影响,且土壤磷酸酶活性、过氧化氢酶活性和GRSP含量与土壤养分和理化性质存在显著的相关关系。说明在喀斯特生态脆弱区采用马尾松人工林造林模式可以通过调整马尾松龄组构成和相应的土壤养分含量变化来促进喀斯特退化地区土壤质量和肥�In order to scientifically grasp and explore the characteristics of soil environment in Karst Areas of Southwest China,formulate reasonable management measures for plantation forests,and promote the restoration of soil fertility in karst ecologically fragile areas.In this study the soil of Pinus massoniana plantation in Fenggang County,Zunyi City,Guizhou Province was selected as the research object.The effects of three age groups and soil layer changes on soil enzyme activity and GRSP content were analyzed,and the relationship between the two and soil physical properties and soil nutrients was also analyzed.The results showed that,(1)the changes of age groups had significant effects on soil enzyme activities.The activities of four soil enzymes in the 0-20 cm soil layer increased with the increase of forest age.The sucrase activities of the soil of the Pinus massoniana plantation in the 0-20 cm soil layer were 8.85,10.42 and 11.98 mg·(g·d)-1 in the middle-aged forest,the near-mature forest and the over-mature forest,respectively.The phosphatase activities were 0.54,0.57 and 0.69 mg·(g·h)-1,and the catalase activities were 2.58,3.15 and 4.40 mL·(g·min)-1,respectively.The sucrase activity of soil in over-mature forest was significantly higher than that in middle-aged forest,and the activities of phosphatase and catalase in siol of over-mature forest were significantly higher than those in middle-aged forest and near mature forest.(2)Soil layer changes had significant effects on soil phosphatase and catalase activities.Under the same age group,soil phosphatase activities of middle-aged forest and near-mature forest in the 20-40 cm soil layer were significantly lower than those in the 0-20 cm soil layer,decreasing by 29.63%and 50.88%,respectively.The catalase activity of over-mature forest in the 20-40 cm soil layer was significantly lower than that in the 0-20 cm soil layer by 25.00%.(3)The contents of EE-GRSP and T-GRSP in 0-20 cm soil layer and 20-40 cm soil layer were in the order of middle-aged forest>over-

关 键 词：喀斯特 马尾松人工林 土壤酶活性 球囊霉素相关土壤蛋白(GRSP) 

分 类 号：S791.248[农业科学—林木遗传育种] S714[农业科学—林学]