文献类型：期刊文献

英文题名：Difference in Response of Caragana intermedia Photosynthesis to Soil Water Content in Different Afforestation Years and Related Threshold Effects in Alpine Sandy Lands

作者：Gao, Ya[1,2] Jia, Zhiqing[1,2] Wu, Rina[3] He, Lingxianzi[2,4] Liu, Tao[1] Li, Qingxue[2,4] Dai, Jie[2,5] Zhang, Jiapeng[1,2] Wang, Long[1,2]

第一作者：Gao, Ya

通信作者：Jia, ZQ[1];Jia, ZQ[2]

机构：[1]Chinese Acad Forestry, Inst Forestry, Beijing 100091, Peoples R China;[2]Qinghai Gonghe Desert Ecosyst & Res Stn, Gonghe 813005, Peoples R China;[3]Chinese Acad Forestry, Beijing 100091, Peoples R China;[4]Chinese Acad Forestry Sci, Inst Ecol Protect & Restorat, Beijing 100091, Peoples R China;[5]Inner Mongolia Univ Technol, Sch Architecture, Hohhot 010051, Peoples R China

年份：2023

卷号：14

期号：4

外文期刊名：FORESTS

收录：;EI(收录号：20231814051852);Scopus(收录号：2-s2.0-85156134484);WOS:【SCI-EXPANDED(收录号:WOS:000979472700001)】；

基金：This work was supported by the Special Fund of the Key Laboratory of Forestry Cultivation of the Research Institute of Forestry, Chinese Academy of Forestry (grant number ZDRIF201903) and the Development and Research on Forest and Grassland Science and Technology Innovation of the State Forestry and Grassland Administration (grant number 2021132007) and Special fund project of the Forestry Research Institute of the Chinese Academy of Forestry (grant number LYSZX202003).

语种：英文

外文关键词：the sandy lands of Qinghai-Tibet Plateau; Caragana intermedia; stomatal conductance; soil water content; threshold

摘要：This study was carried out to clarify the response of photosynthesis physiology of Caragana intermedia, an excellent tree species for wind protection and sand fixation, to soil water content (SWC) and to determine the relevant threshold ranges in the sandy lands of Qinghai-Tibet Plateau. In this study, based on the three-year forest experiment from 2017a to 2019a, C. intermedia in different afforestation years (2013a, 2011a, 2008a, 2006a, 2001a and 1986a) were selected for experimental analysis, the response process of leaf photosynthesis of C. intermedia to SWC changes was studied, and the physiological mechanism and growth suitability of C. intermedia to adapt to an alpine desert environment were clarified. The results showed that SWC played a critical role in the photosynthesis of C. intermedia in the sandy lands of Qinghai-Tibet Plateau. Afforestation years are negatively correlated with Pn, gs and Tr, but positively correlated with WUE; the longer the afforestation years, the higher demand for soil moisture. Regarding the relative roles of SWC and photosynthetic parameters, we demonstrated that this showed a significant square relationship (p < 0.001), while stomatal closure induced by the photosynthesis decline was important under dryness stress. The no-productivity and no-efficiency water (NPNEW) for the photosynthesis physiology of trees in different afforestation years were 3.31-3.64%; 3.33-4.06%; 3.08-3.63%; 3.36-3.85%; 1.45-4.02% and 3.39-5.50%, and the highest productivity with the highest availability of water (HPHAW) were 6.65-7.19%; 6.74-7.36%; 7.36-7.91%; 6.10-7.51%; 6.57-8.19% and 6.52-8.35%. Plantations in different afforestation years could survive safely in the sandy lands of Qinghai-Tibet Plateau. However, the productivity of trees decreased with the increase length of afforestation years; thus, we should pay attention to their growth status and make timely management adjustments in the future. These results provide important information for theoretical support for the diagnosis of ecological adaptability and field water management of C. intermedia in the sandy lands of Qinghai-Tibet Plateau and provide a reference for the adaptability evaluation and water-carbon cycle simulation of plantations in the sandy lands of Qinghai-Tibet Plateau against the background of global climate change.