文献类型：期刊文献

英文题名：Variations in rhizosphere soil total phosphorus and bioavailable phosphorus with respect to the stand age in Pinus massoniana Lamb.

作者：Xu, Yaowen[1,2] Ge, Xiaogai[1,2] Zhou, Benzhi[1,2] Lei, Lei[3] Xiao, Wenfa[3]

第一作者：Xu, Yaowen

通信作者：Ge, XG[1];Zhou, BZ[1];Ge, XG[2];Zhou, BZ[2]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou, Peoples R China;[2]Natl Forestry & Grassland Adm China, Qianjiangyuan Forest Ecosyst Res Stn, Hangzhou, Peoples R China;[3]Chinese Acad Forestry, Res Inst Forest Ecol Environm & Natl Protect, Key Lab Forest Ecol & Environm, State Forestry Adm, Beijing, Peoples R China

年份：2022

卷号：13

外文期刊名：FRONTIERS IN PLANT SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000862779100001)】；

基金：Funding This study was supported by the Fundamental Research Funds for the Central Non-profit Research Institution (CAFYBB2021QD002 and CAFYBB2020ZE001) and Qianjiangyuan National Forest Ecological Research Station.

语种：英文

外文关键词：phosphorus fractions; bioavailable phosphorus; phosphorus recycling; rhizosphere soil; stand age

摘要：Phosphorus (P) is a nutrient limiting plant growth in subtropical regions. However, our understanding of how soil P responds to an increase in stand age is rather poor. In particular, little is known about how bioavailable P pools (soluble P, exchangeable P, hydrolyzable P, and ligand P) shift with a change in stand age. Moreover, the P cycle in rhizosphere soil has the most direct and significant influence on plants. The aim of the present study was to determine the concentrations of total P in various rhizosphere soil bioavailable P fractions in 5-, 9-, 19-, 29-, and 35-year-old stands of Pinus massoniana Lamb. According to the results, total P (TP) concentration and N:P ratio in rhizosphere soil first decreased, and then increased with an increase in stand age. Soluble P concentration decreased first, and then increased with an increase in stand age; exchangeable P and ligand P decreased first, and then tended to be stable with an increase in stand age, whereas hydrolyzable P increased first, and then decreased. Structural Equation Model results suggested that ligand P and soluble P were the major factor affecting the TP. In addition, soil microorganisms and acid phosphatase-driven hydrolyzable P play a crucial role in soil bioavailable P cycling. Overall, the results of our study provide a mechanistic understanding of soil bioavailable P cycling under low available P conditions, and a basis for an effective P management strategy for the sustainable development of P. massoniana plantations.