文献类型：期刊文献

英文题名：Nitrogen rather than carbon released by litter decomposition mediates nutrient relationships in a multispecies forest plantation with hemiparasite

作者：Qin, Fangcuo[1] Lu, Junkun[1] Li, Zhenshuang[1] Meng, Sen[1] Wang, Shengkun[1] Liang, Junfeng[1] He, Xinhua[2,3]

第一作者：Qin, Fangcuo

通信作者：Lu, JK[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, State Key Lab Tree Genet & Breeding, Guangzhou 510520, Guangdong, Peoples R China;[2]Univ Western Australia, Sch Biol Sci, Perth, WA 6009, Australia;[3]Univ Calif Davis, Dept Land Air & Water Resources, Davis, CA 95616 USA

年份：2023

卷号：888

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20232114121041);Scopus(收录号：2-s2.0-85159550106);WOS:【SCI-EXPANDED(收录号:WOS:001010473600001)】；

基金：Funding This research was jointly funded by the National Natural Science Foun-dation of China (31722012 and 31670636) , the Guangdong Basic and Ap-plied Basic Research Foundation (2022A1515010413) , and the Guangzhou Basic and Applied Basic Research Foundation (202201011313) .

语种：英文

外文关键词：Hemiparasitic plant; Litter decomposition; Isotope labeling; Multispecies forest plantation

摘要：Hemiparasitic plants influence community composition by altering nutrient cycling. Although hemiparasites can deplete a host's nutrients via parasitism, their potentially positive effects on nutrient return to multispecies communities remain unclear. We used C-13/N-15-enriched leaf litter of the hemiparasite sandalwood (Santalum album, Sa) and two N2fixing hosts of acacia (Acacia confusa, Ac) and rosewood (Dalbergia odorifera, Do), either as a single-species or mixedspecies litter, to elucidate nutrient return by litter decomposition in an acacia-rosewood-sandalwood mixed plantation. We determined litter decomposition rates, litter C and N release, and the resorption of C and N from seven litter types (Ac, Do, Sa, AcDo, AcSa, DoSa, and AcDoSa) at 90,180, 270, and 360 days. We found that non-additive mixing effects were common during the decomposition of mixed litter and depended on litter type and decomposition timing. After rapidly increasing for around 180 days, both the decomposition rate and release of C and N from litter decomposition declined, but the resorption of litter-released N by the target tree species increased. There was a 90-day lag time between the release and resorption of litter N. Sandalwood litter consistently stimulated the litter mass loss of its mixed litter. Rosewood had the highest release rate of litter C-13 or N-15 from litter decomposition, but resorbed more litter N-15 into its leaves than other tree species. In contrast, acacia had a lower decomposition rate and a higher N-15 resorption in its roots. Initial litter quality was closely correlated with the release of litter N-15. Neither the release nor resorption of litter C-13 significantly differed among sandalwood, rosewood, and acacia. Our study demonstrates that the fate of litter N, rather than litter C, mediates nutrient relationships in mixed sandalwood plantations and thus provides important silvicultural implications for planting sandalwood with other host species.