杉木闽楠混交林根际土壤生态化学计量特征及其根际效应

doi:10.13292/j.1000-4890.202507.022

生态学杂志 ›› 2025, Vol. 44 ›› Issue (7): 2268-2276.doi: 10.13292/j.1000-4890.202507.022

杉木闽楠混交林根际土壤生态化学计量特征及其根际效应

黄澳^1,2,及利^1,2,何功秀^1,2,倪艳林^1,2,杨丽丽^1,2*,王明坤³

（¹中南林业科技大学林学院，长沙 410000； ²南方林业生态应用技术国家工程实验室，长沙 410000； ³辽宁西丰县林业事务服务中心，辽宁铁岭 112000）

出版日期:2025-07-10 发布日期:2025-07-11

Ecological stoichiometric characteristics and rhizosphere effects of soil in mixed forests of Cunninghamia lanceolata and Phoebe bournei.

HUANG Ao^1,2, JI Li^1，2, HE Gongxiu^1,2, NI Yanlin^1,2, YANG Lili^1,2*, WANG Mingkun³

(¹Central South University of Forestry and Technology, Changsha 410000, China; ²National Engineering Laboratory of Southern Forestry Ecological Application Technology, Changsha 410000, China; ³Liaoning Forestry Affairs Service Center of Xifeng County, Tieling 112000, Liaoning, China).

Online:2025-07-10 Published:2025-07-11

摘要/Abstract

摘要： 根际是林木与外界环境交换物质与能量的重要场所，研究根际土壤化学特征对于了解森林生态系统中植物-土壤-微生物之间的养分循环过程具有重要意义。本研究以10年生杉木纯林（PCL）、闽楠纯林(PPB)和杉木闽楠混交林（MCP）为对象，测定旱季和雨季下根际和非根际土壤碳（C）、氮（N）、磷（P）含量，分析元素生态化学计量特征的根际效应。结果表明：3种林型下，根际土壤的有机碳（SOC）、全氮（TN）、全磷（TP）、微生物量碳（MBC）、微生物量氮（MBN）和微生物量磷（MBP）含量总体上高于非根际土壤；混交林中杉木和闽楠根际土壤SOC、TN、TP、MBC、MBN和MBP含量分别显著低于杉木和闽楠纯林。PCL林根际土壤C∶N、C∶P和N∶P显著高于PPB林；根际土壤C∶N和C∶P在旱季时的变化趋势一致；与闽楠混交后，杉木根际和非根际土壤的MBC∶MBN和MBC∶MBP在旱季显著上升；与杉木混交后，闽楠根际和非根际土壤的MBC∶MBN和MBC∶MBP显著下降；土壤蔗糖酶活性在不同季节下均表现为混交林根际高于纯林根际，而过氧化氢酶活性在混交林根际土壤下显著低于纯林根际；偏最小二乘路径分析表明，混交对土壤微生物量和根际效应具有总的负效应，其中MBP的根际效应值最大；混交对土壤pH具有总的正效应。

关键词: 微生物量, 根际土, 养分循环, 土壤酶

Abstract: The rhizosphere is an important site for the exchange of matter and energy between trees and the external environment. It is of great significance to explore rhizosphere soil microorganisms and their stoichiometric characteristics for understanding nutrient cycling in forest ecosystems. In this study, the contents of carbon (SOC), nitrogen (TN) and phosphorus (TP) in rhizosphere and bulk soil under dry and wet seasons were measured in 10-year-old pure forest of Cunninghamia lanceolata (PCL), pure forest of Phoebe bournei (PPB) and mixed forest of Cunninghamia lanceolata and Phoebe bournei (MCP), and the rhizosphere effects of ecological stoichiometry were analyzed. The results showed that the contents of SOC, TN, TP, microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and microbial biomass phosphorus (MBP) in rhizosphere soil under the three forest types were generally higher than those in bulk soil. The contents of SOC, TN, TP, MBC, MBN and MBP in rhizosphere soil of Cunninghamia lanceolata and Phoebe bournei in mixed forest were significantly lower than those of pure Cunninghamia lanceolata and Phoebe bournei plantations, respectively. Soil C∶N, C∶P and N∶P in PCL stand were significantly higher than those in PPB. The MBC∶MBN and MBC∶MBP of rhizosphere and bulk soils increased significantly in dry season after mixed with Phoebe bournei, and these ratios of rhizosphere and bulk soils of Phoebe bournei decreased significantly after mixing with Cunninghamia lanceolata. The activity of rhizosphere soil sucrase was higher in mixed forest than in pure forest in both seasons. The activity of catalase in mixed rhizosphere soil was significantly lower than that in bulk soil. Results of partial least squares path analysis showed that mixed planting had negative effects on soil microbial biomass and rhizosphere effect, with a greatest rhizosphere effect on MBP. Mixed cultivation had overall positive effect on soil pH.

Key words: microbial biomass, rhizosphere soil, nutrient cycling, soil enzyme

黄澳, 及利, 何功秀, 倪艳林, 杨丽丽, 王明坤. 杉木闽楠混交林根际土壤生态化学计量特征及其根际效应[J]. 生态学杂志, 2025, 44(7): 2268-2276.

HUANG Ao, JI Li, HE Gongxiu, NI Yanlin, YANG Lili, WANG Mingkun. Ecological stoichiometric characteristics and rhizosphere effects of soil in mixed forests of Cunninghamia lanceolata and Phoebe bournei. [J]. Chinese Journal of Ecology, 2025, 44(7): 2268-2276.

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杉木闽楠混交林根际土壤生态化学计量特征及其根际效应

Ecological stoichiometric characteristics and rhizosphere effects of soil in mixed forests of Cunninghamia lanceolata and Phoebe bournei.

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