不同凋落叶和磷添加对亚热带马尾松土壤有机碳氮组分的影响
Effects of Different Litter Leaves and Phosphorus Addition on Soil Organic Carbon and Nitrogen Components of Pinus massoniana Soil in Subtropics
吴晓霞 1元晓春 2梅孔灿 1刘苑苑 1陈文伟 3陈岳民1
作者信息
- 1. 福建师范大学地理科学学院,福建福州 350007;湿润亚热带山地生态国家重点实验室培育基地,福建福州 350007
- 2. 福建师范大学地理科学学院,福建福州 350007;湿润亚热带山地生态国家重点实验室培育基地,福建福州 350007;武夷学院旅游学院,福建武夷山 354300
- 3. 福建戴云山国家级自然保护区管理局,福建泉州 362500
- 折叠
摘要
[目的]探究凋落叶、P添加及其交互作用对有机碳(SOC)和有机氮(SON)组分的影响.[方法]以马尾松土壤为研究对象,通过为期125 d的室内培养试验,探究了3种凋落叶添加(马尾松、火力楠和枫香)和P添加(KH2PO4)对土壤SOC和SON组分的影响.[结果]凋落叶添加和P添加均显著降低了惰性碳(RP-C)组分的含量,两者共同添加时表现出较强的交互作用.凋落叶对SOC和SON的影响受土壤P有效性的影响,P添加加速了凋落叶添加下土壤微生物对原有RP-C的分解.冗余分析显示,氨态氮(NH4+-N)和有效磷(AP)是SOC组分重要的影响因子,而SON组分重要的预测因子是可溶性有机氮(DON)和微生物生物量磷(MBP).[结论]P添加会促进凋落叶在土壤的分解和转化,且凋落叶的输入增加了对RP-C的分解,这将进一步加速SOC的周转.
Abstract
[Objective]To investigate the effects of leaf litter,P addition,and their interactions on changes in SOC and SON components.[Method]The effects of three kinds of withered leaf additions(Michelia macclurei,Pinus masson and Liquidam fortiana)and P addition(KH2 PO4)on SOC and SON components were investigated through a 125-day indoor culture experiment with the soil of Pinus massoniana as the research object.[Result]The results showed that both leaf litter addition and P addition significantly reduced the content of recalcitrant C(RP-C)component,and they showed a strong interaction.The effects of leaf litter on SOC and SON were influenced by soil P availability,and P addition accelerated the decomposition of original recalcitrant C by soil microorganisms under leaf litter addition.Redundancy analysis showed that ammonia nitrogen(NH+4-N)and available phosphorus(AP)were the most important influencing factors of SOC fraction,while dissolved organic carbon(DON)and microbial biomass phosphorus(MBP)were the most important predictors of SON fraction.[Conclusion]P addition can promote the decomposition and transformation of leaf litter in soil,and the input of leaf litter increases the decomposition of recalcitrant C,which will further accelerate the turnover of SOC.This study will provide a scientific basis for the study of carbon and nitrogen cycling in sub-tropical soil with increased litter input and P limitation and forest soil management in Daiyunshan Nature Reserve.
关键词
凋落叶/P添加/两步酸水解/土壤有机碳、氮组分/酶活性Key words
Leaf litter/Phosphorus addition/Two-step acid hydrolysis/Carbon and nitrogen components/Enzyme activity引用本文复制引用
基金项目
福建省自然科学基金(2020J01397)
福建省自然科学基金(2020J01142)
出版年
2023
国家科技期刊平台
NSTL
维普
万方数据