文献类型：期刊文献

英文题名：Contrasting leaf nutrient-hydraulic relationships between karst and non-karst forests

作者：Wan, Chun-Yan[1,2] Yu, Jun-Rui[1,2] Li, Zhong-Guo[3,4] Wang, Yong-Qiang[1,2,5] Zhu, Shi-Dan[1,2]

第一作者：Wan, Chun-Yan

通信作者：Zhu, SD[1];Zhu, SD[2]

机构：[1]Guangxi Univ, Guangxi Coll, Guangxi Key Lab Forest Ecol & Conservat, Nanning 530004, Peoples R China;[2]Guangxi Univ, Univ Key Lab Cultivat & Utilizat Subtrop Forest Pl, Coll Forestry, Nanning 530004, Peoples R China;[3]Chinese Acad Forestry, Expt Ctr Trop Forestry, Nanning 530004, Peoples R China;[4]Guangxi Youyiguan Forest Ecosyst Natl Res Stn, Pingxiang 532600, Peoples R China;[5]Tsinghua Univ, Dept Earth Syst Sci, Minist Educ, Key Lab Earth Syst Modeling, Beijing 100084, Peoples R China

年份：2025

外文期刊名：PLANT AND SOIL

收录：;Scopus(收录号：2-s2.0-85218139746);WOS:【SCI-EXPANDED(收录号:WOS:001396139000001)】；

基金：This study was financially supported by the National Natural Science Foundation of China (32171502) and the Natural Science Foundation of Guangxi Zhuang Autonomous Region (2023GXNSFFA026008).

语种：英文

外文关键词：Ecological strategy; Hydraulic; Karst; Nutrient; Tropical and subtropical

摘要：Background and aimsKarst landscapes, characterized by large limestone outcrops and shallow, thin soils, are extensively distributed in Southwest China. Tree species found in karst forests encounter frequent drought, phosphorus (P) deficiency, and excess calcium (Ca) and magnesium (Mg). We aimed to elucidate leaf strategies for karst and non-karst forest species grown on different soil substrates.MethodsWe selected a total of 100 typical tree species from karst and non-karst forests in tropical-subtropical China, and measured leaf hydraulic traits and nutrient concentrations. We compared differences in leaf traits between the two forest types using t-test and their differences in trait relationships using trait network analysis.ResultsKarst tree species exhibited lower leaf turgor loss point (pi tlp) and midday leaf water potential, and narrower hydraulic safety margins than non-karst tree species. Furthermore, karst species had higher nitrogen, potassium, Ca, and Mg, but lower P levels than non-karst species; however, they showed similar Ca/Mg ratios. Trait network analysis revealed a higher degree of leaf traits relationships in karst species, with saturated water content, P, and pi tlp showing high connectivity with other traits. Particularly, karst species with higher leaf Ca, and lower P levels tended to have lower pi tlp and vulnerability to cavitation, indicating a co-variation between leaf nutrients and drought resistance under unique chemical and physical conditions of karst environment. However, these relationships were not observed in non-karst species, resulting in weak leaf trait relationships.ConclusionThis study suggests that strong associations between leaf nutrient and hydraulic traits in karst species promote their adaptation to soil water and nutrient stresses.