文献类型：期刊文献

英文题名：N₂-Fixing Tree Species Help to Alleviate C- and P-Limitation in Both Rhizosphere and Non-Rhizosphere Soils in the Eucalyptus Plantations of Subtropical China

作者：Li, Jiajun[1] Huang, Haimei[1] You, Yeming[1,2] Xiang, Mingzhu[1] Li, Changhang[1] Ming, Angang[2,3] Ma, Hailun[1] Huang, Xueman[1,2]

第一作者：Li, Jiajun

通信作者：Huang, XM[1];Huang, XM[2]

机构：[1]Guangxi Univ, Coll Forestry, Guangxi Coll & Univ Key Lab Cultivat & Utilizat Su, Guangxi Key Lab Forest Ecol & Conservat, Nanning 530004, Peoples R China;[2]Guangxi Youyiguang Forest Ecosyst Res Stn, Pingxiang 532600, Peoples R China;[3]Chinese Acad Forestry, Expt Ctr Trop Forestry, Pingxiang 532600, Peoples R China

年份：2023

卷号：14

期号：10

外文期刊名：FORESTS

收录：;EI(收录号：20234414988560);Scopus(收录号：2-s2.0-85175069560);WOS:【SCI-EXPANDED(收录号:WOS:001097972800001)】；

基金：We are very grateful to the Guangxi Youyiguang Forest Ecosystem National Research Station and the College of Forestry, Guangxi University, for their support of this study.

语种：英文

外文关键词：enzyme activity; enzyme stoichiometry; rhizosphere soil; nutrient limitation; Eucalyptus plantation

摘要：The extracellular enzyme activity (EEA) and enzymatic stoichiometry (EES) of soil are useful indicators of shifts in soil nutrition and microbial resource requirements. Nevertheless, it is uncertain how the limitation of soil microbial nutrients is altered by a Eucalyptus plantation mixed with a N-2-fixing tree species. Our study examined the microbial nutrient limitation in two plantations: a pure Eucalyptus plantation (PP) and a mixed plantation (Eucalyptus and Erythrophleum fordii, MP) in rhizosphere and non-rhizosphere soils, beginning with two indicators, soil EEA and EES. In this study, the soil EEA was considerably (p < 0.05) greater in the MP contrasted to the PP, and the enzyme C:N:P ratios of the PP (1.12:1:1.10) and MP (1.07:1:1.08) both diverged from the global average EEA (1:1:1), and the deviation degree of the PP was greater. The results of the vector analysis demonstrated that the vector angle (VA) and vector length (VL) were considerably (p < 0.05) smaller in the MP contrasted to the PP. In comparison to the PP, the MP had a considerably (p < 0.05) poorer carbon quality index (CQI). Additionally, both microbial and soil properties have a considerable impact on soil EEA and EES, according to variance partitioning analysis (VPA) and redundancy analysis (RDA). In summary, our results show that the restriction of microorganisms on C and P in rhizosphere soils is usually weaker than that in non-rhizosphere soils and that the addition of N-2-fixing tree species to Eucalyptus plantations can lessen but not completely remove the restriction of soil microorganisms on C and P. Future management practices involving mixed plantations with N-2-fixing trees species could help decrease microbial nutrient limitation and promote sustainable plantations.