文献类型：期刊文献

英文题名：The Responses of C Allocation of New Needle and Fine Root Affected the Phosphorus Adaptation of Pinus massoniana Seedlings

作者：Xu, Jin[1] Lei, Lei[1,2] Zeng, Lixiong[1,2] Ni, Yanyan[3] Jian, Zunji[1] Deng, Xiuxiu[4] Xiao, Wenfa[1,2]

通信作者：Xiao, WF[1];Xiao, WF[2]

机构：[1]Chinese Acad Forestry, Natl Forestry & Grassland Adm, Ecol & Nat Conservat Inst, Key Lab Forest Ecol & Environm, 1 Dongxiaofu,Xiangshan Rd, Beijing 100091, Peoples R China;[2]Nanjing Forestry Univ, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Peoples R China;[3]Minist Ecol & Environm, Nanjing Inst Environm Sci, Nanjing 210042, Peoples R China;[4]Chinese Acad Forestry, Expt Ctr Forestry North China, Beijing 102300, Peoples R China

年份：2023

外文期刊名：JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION

收录：;Scopus(收录号：2-s2.0-85179690583);WOS:【SCI-EXPANDED(收录号:WOS:001129862800002)】；

基金：We are grateful to the Zigui Forest Ecosystem Research Station for providing the experimental site and experimental supports.

语种：英文

外文关键词：Pinus massoniana; Phosphorus; Growth; Non-structural carbohydrates; Carbon allocation

摘要：Carbon (C) allocation plays a vital role in enabling plants to effectively cope with limited phosphorus (P) availability, especially in P-deficient subtropic. However, in what pattern did C allocated to different plant organs along a P gradient is still unclear. This study conducted a nutrient manipulation experiment on Pinus massoniana seedlings, an endemic species in subtropical China, to explore the variations in non-structural carbohydrate (NSC) fractions of needles and roots along a fact-based P gradient of 0-9.299 mg.kg(-1) (0-4 times of average soil available P content in the major distribution area of P. massoniana). P promoted the relative growth rate of P. massoniana seedlings. Biomass showed no difference along the P gradient, but biomass proportion of fine root decreased with P addition. The C concentration in new needle increased with increasing substrate P content, but old needle showed an reverse trend. Old needle remained major C pool in low-P conditions, but more C would be allocated to new needle with P addition. Higher C was found in fine root in low-P groups. The NSC concentration in needles rose with P addition, but decreased in roots. NSC existed more in the form of soluble sugar in needles in low-P conditions, but more in the form of starch in fine root. In low-P conditions, P. massoniana seedlings regulated growth by preferentially allocating C to fine root and old needle, promoting absorption and maintaining a stable C pool, while exhibiting distinct NSC fraction patterns in fine root (starch) and needles (soluble sugar).