华南典型人工林对土壤易氧化有机碳的影响  

Effects of typical plantations on soil readily oxidized carbon in south China

作　　者：顾晓娟 于耀泓 刘悦 吴梦佳 刘林云慧 莫其锋 GU Xiaojuan;YU Yaohong;LIU Yue;WU Mengjia;LIU Linyunhui;MO Qifeng(College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou,Guangdong 510642,China;Chinese Forest Ecosystem Research Network Guangdong E'huangzhang Field Observation and Research Station,Yangjiang,Guangdong 529631,China)

机构地区：[1]华南农业大学林学与风景园林学院,广东广州510642 [2]中国森林生态系统定位观测研究网络广东鹅凰嶂野外科学观测研究站,广东阳江529631

出　　处：《森林与环境学报》2023年第2期145-151,共7页Journal of Forest and Environment

基　　金：广东省林业科技创新项目“粤西地区优质高产林分碳封存潜力提升的施肥技术体系构建”(2022KJCX017)、“碳中和背景下广东省典型优势树种大径材培育关键技术体系构建与示范”(2022KJCX015)。

摘　　要：为了解华南地区固氮树种与非固氮树种造林对土壤碳氮磷化学计量特征及易氧化有机碳(ROC)的影响,对广东省鹤山市造林13 a的固氮树种厚荚相思(Acacia crassicarpa)人工纯林和非固氮树种尾叶桉(Eucalyptus urophylla)人工纯林的土壤碳(C)、氮(N)、磷(P)与ROC含量进行测定,分析固氮与非固氮树种造林后土壤C、N、P和ROC的特征及相关关系。结果表明:固氮树种土壤ROC与总有机碳(TOC)含量均显著高于非固氮树种(P<0.05),且ROC/TOC值小于非固氮树种,土壤碳稳定性更强;固氮树种总氮(TN)含量和C∶N值均显著高于非固氮树种(P<0.05),C∶P、N∶P和C∶N∶P均高于非固氮树种,但无统计学上的差异;在两种林分下,TOC和TN都呈极显著正相关关系(P<0.01);在固氮树种中,TOC、TN与ROC/TOC呈显著负相关关系(P<0.05),土壤含水量(SWC)、C∶P、N∶P与TOC呈显著正相关(P<0.05)关系。在土壤含水量较高的华南地区,固氮树种造林提高了土壤TN、TOC含量和土壤化学计量比,有利于提高土壤碳稳定性。Here, we aimed to understand the effects of nitrogen(N)-fixing and non-N-fixing tree species on the stoichiometric characteristics of soil carbon(C), N, phosphorus(P), and soil readily oxidized carbon(ROC) in south China. We determined the levels of soil total organic C(TOC), total N(TN), total P(TP), and ROC in 13-year-old Acacia crassicaipa and Eucalyptus urophylla plantations in Heshan, Guangdong Province, to analyze their characteristics and correlation of N-fixing and non-N-fixing tree species after afforestation. The results showed that soil ROC and TOC contents in N-fixing tree stands were significantly higher than those in non-N-fixing tree stands(P<0.05), and ROC/TOC values were lower in the N-fixing than the non-N-fixing tree stand soils, indicating that soil C stability was improved in the N-fixing tree stand soils compared to the non-N-fixing tree stand soils. The soil TN content and C∶N value were significantly higher in the N-fixing stands than in the non-N-fixing stands(P<0.05). Soil C∶P, N∶P, and C∶N∶P were higher in the N-fixing stands, but the differences were not statistically significant. Soil TOC and TN were positively correlated in both stands(P<0.01). In N-fixing stands, soil TOC and TN were negatively correlated with ROC/TOC(P<0.05), and soil water content(SWC), C∶P, and N∶P were significantly positively correlated with TOC(P<0.05). In south China, where SWC is high, afforestation with N-fixing trees increased soil TN and TOC contents and soil stoichiometric ratio, which helped improve soil C stability.

关 键 词：华南地区 固氮树种 非固氮树种 土壤化学计量 易氧化有机碳 人工林 

分 类 号：S714.5[农业科学—林学]