文献类型：期刊文献

英文题名：Comparison of C, N and P Stoichiometry in Different Organs of Fraxinus velutina

作者：Dong, Linshui[1] Song, Aiyun[1] Zhang, Jianfeng[2] Peng, Ling[1] Cheng, Nannan[3] Cao, Banghua[4]

第一作者：Dong, Linshui

通信作者：Song, AY[1]

机构：[1]Binzhou Univ, Shandong Prov Key Lab Ecoenvironm Sci Yellow River, Binzhou 256600, Peoples R China;[2]Chinese Acad Forestry, Inst Subtrop Forestry, Hangzhou 311400, Peoples R China;[3]Auburn Univ, Sch Forestry & Wildlife Sci, Auburn, AL 36949 USA;[4]Shandong Agr Univ, Key Lab State Forestry Adm Silviculture Lower Yell, Tai An 271018, Peoples R China

年份：2023

卷号：14

期号：1

外文期刊名：FORESTS

收录：;EI(收录号：20230413443445);Scopus(收录号：2-s2.0-85146762006);WOS:【SCI-EXPANDED(收录号:WOS:000917567600001)】；

基金：This research was financially supported by the Natural Science Foundation of Shandong Province (No. ZR2020MD007), the Major Scientific and Technological Innovation Projects of Shandong Province (No. 2017CXGC0316), and the Key Research and Development Program of Shandong Province (No. 2017GSF17113).

语种：英文

外文关键词：carbon; nitrogen; phosphorus; sexual differences; urban forest; leaf; branch; fruit

摘要：Velvet ash (Fraxinus velutina Torr.) is a dioecious tree species, which is widely used as a part of urban greeneries in saline land of North China. Female and male trees have different nutrient allocation trade-offs in dioecious species. As the fruit production consumes a lot of nutrients, female F. velutina plants grow slowly and are vulnerable to insects and diseases. Ecological stoichiometry can be used to study the physiological mechanism of the growth difference between female and male plants. The purpose of this study was to compare the seasonal patterns of C, N and P stoichiometry and their trade-offs in different organs of female and male F. velutina plants planted in urban green spaces. The fruit C, N and P contents of female F. velutina plants were all lower than those of leaves in the early growing season, but higher than those of leaves in the middle and late growing season. During most months, the leaf C and P contents of females were higher than those of males, while the leaf N content was lower than that of males, which was consistent with the sex-specific resource requirements for reproduction (i.e., high carbon requirements for ovules and high nitrogen demands for pollen). Compared to the females, there were more significant correlations between the stoichiometric indices (element contents and their ratios) of branches and leaves in male plants, and this difference may be related to the fact that the male plants were not involved in nutritional allocation for fruits. The leaf N/P of F. velutina was lower than 14 in the whole growing season, which indicated N limitation. The female and male plants of F. velutina had different sex-specific resource requirements for sex organ formation.