文献类型：期刊文献

英文题名：Strong link in hydrogen isotope ratios between plant α-cellulose and source water for an alpine peatland in the Altai Mountains of northwestern China: Implications for palaeohydrological reconstructions

作者：Shi, Fuxi[1];Rao, Zhiguo[2];Cao, Jiantao[3];Huang, Chao[4];Li, Yunxia[2];Lin, Guanghui[5]

机构：[1]Jiangxi Agr Univ, Coll Forestry, Key Lab Natl Forestry & Grassland Adm Forest Ecosy, Nanchang 330045, Peoples R China;[2]Hunan Normal Univ, Sch Geog Sci, Changsha 410081, Peoples R China;[3]Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China;[4]Guangdong Ocean Univ, Coll Ocean & Meteorol, Guangdong Prov Key Lab Coastal Ocean Variat & Disa, Zhanjiang 524088, Peoples R China;[5]Tsinghua Univ, Dept Earth Syst Sci, Key Lab Earth Syst Modeling, Minist Educ, Beijing 100084, Peoples R China

年份：2025

卷号：663

外文期刊名：JOURNAL OF HYDROLOGY

收录：SCI-EXPANDED(收录号：WOS:001566824500005)、、EI(收录号：20253519080132)、Scopus(收录号：2-s2.0-105014444924)、WOS

基金：We thank Weizhen Sun and Dr. Xiaomei Peng of the Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences for their technical assistance with the isotopic measurement and anatomical analysis; and the efforts of lab assistant Shanxian Zhu of the stable isotope laboratory of the Department of Earth System Science, Tsinghua University. We also thank Muhtar Abdunnasir, Min Tang, and other staff members of Xinjiang Wuqilike National Wetland Park for their help in field sampling. This work was supported by the National Key Research and Development Program of China (2023YFF1304505), the National Natural Science Foundation of China (42171156 and 42567035), the Jiangxi Provincial Natural Science Foundation (20242BAB25350), the Ganpo Juncai Plan (QN2023018), and the Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province.

语种：英文

外文关键词：Hydrological reconstruction; Tree-ring cellulose; Hydrogen isotope; Roden-Lin-Ehleringer model; Peatland

外文摘要：The hydrogen isotopic composition of plant alpha-cellulose (delta Dcell) could help us to understand past hydrological and ecological processes via unraveling plant-water interactions. However, such paleo-hydrological proxy indicator was rarely applied in natural archives relative to carbon and oxygen isotopes. This study reported strong relationships of delta Dcell of a predominant sedge plant (Carex pamirensis) with hydrogen isotope ratios (delta D) of their potential source waters for a vascular-plant-dominated alpine peatland in the southern Altai Mountains of northwestern China. We relied on the Roden-Lin-Ehleringer (RLE) mechanistic model to improve our understanding of the linkage between delta Dcell values and hydroclimatic processes. The stable isotope results over two growing seasons indicated that the delta D values of swale/soil/stem water had a better response to seasonal dynamics of inflowing meltwater, implying that the water uptake by the roots of vascular sedge plants was chiefly controlled by more negative winter precipitation rather than summer precipitation. The net D enrichment factor (2 Delta) during cellulose biosynthesis caused by enriched leaf water was less variable (32.6 +/- 3.0 parts per thousand for 2 Delta Modelled) due to stable relative humidity on the monthly timescale. Moreover, the higher delta D variability of surface source waters during the growing season was not fully recorded in alpha-cellulose due to the narrow range of ecological tolerance of C. pamirensis. Consequently, the delta Dcell values could record the seasonal changes in the delta D values of swale/soil/stem water. Using the RLE mechanistic model, we found that the estimated delta Dsw values of the source water from the measured delta Dcell values were very close to the measured source water delta D values. Our results suggest that the hydrogen isotope of past source water can be reconstructed from cellulose D/H ratios from the vascular sedge species employing the RLE model, which can facilitate better quantitative reconstruction of regional palaeohydrology.