Divergent responses of woody plant leaf and root non-structural carbohydrates to nitrogen addition in China: Seasonal variations and ecological implications

被引：8

作者：

Mou, Rui ^{[1
]}

Jian, Yi ^{[2
]}

Zhou, Dengjie ^{[1
]}

Li, Jihong ^{[1
]}

Yan, Yao ^{[1
]}

Tan, Bo ^{[1
]}

Xu, Zhenfeng ^{[1
]}

Cui, Xinglei ^{[1
]}

Li, Han ^{[1
]}

Zhang, Li ^{[1
]}

Xu, Hongwei ^{[1
]}

Xu, Lin ^{[1
]}

Wang, Lixia ^{[1
]}

Liu, Sining ^{[1
]}

Yuan, Yaling ^{[1
]}

Li, Jiao ^{[1
]}

Wang, Lihua ^{[3
]}

You, Chengming ^{[1
]}

Sardans, Jordi ^{[4
,5
]}

Penuelas, Josep ^{[4
,5
]}

机构：

[1] Sichuan Agr Univ, Coll Forestry, Yangtze River & Forestry Ecol Engn Upper Reaches, Natl Forestry & Grassland Adm,Key Lab Forest Resou, Chengdu 611130, Peoples R China

[2] Sichuan Acad Forestry Ecol Restorat & Conservat Fo, Key Lab Sichuan Prov, Chengdu 610081, Peoples R China

[3] Aba Teachers Univ, Coll Resources & Environm, Wenchuan 623002, Sichuan, Peoples R China

[4] CSIC, Global Ecol Unit CREAF CSIC UAB, Barcelona 08193, Catalonia, Spain

[5] CREAF, E-081193 Barcelona, Catalonia, Spain

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2024年 / 950卷

基金：

中国国家自然科学基金;

关键词：

Nitrogen fertilization; Woody plants; Plant functional types; Photosynthate carbon; Growing and non-growing seasons; meta-analysis; BOTHRIOCHLOA-ISCHAEMUM; CARBON ALLOCATION; GROWTH-RATE; DROUGHT; PHOTOSYNTHESIS; SEEDLINGS; DYNAMICS; STARCH; TRAITS; FERTILIZATION;

D O I：

10.1016/j.scitotenv.2024.175425

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Plant non-structural carbohydrates (NSCs), which largely comprise starch and soluble sugars, are essential energy reserves to support plant growth and physiological functions. While it is known that increasing global deposition of nitrogen (N) affects plant concentration of NSCs, quantification of seasonal responses and drivers of woody species leaf and root NSCs to N addition at larger spatial scales remains lacking. Here, we systematically analyzed data from 53 field experiments distributed across China, comprising 1202 observations, to test for effects of N addition on woody plant leaf and root NSCs across and within growing and non-growing seasons. We found (1) no overall effects of N addition on the concentrations of leaf and root NSCs, soluble sugars or starch during the growing season or the non-growing season for leaves. However, N addition decreased root NSC and starch concentrations by 13.8 % and 39.0%, respectively, and increased soluble sugars concentration by 15.0% during the non-growing season. (2) Shifts in leaf NSC concentration under N addition were driven by responses by soluble sugars in both seasons, while shifts in root NSC were driven by soluble sugars in the non-growing season and starch and soluble sugars in the growing season. (3) Relationships between N, carbon, and phosphorus stoichiometry with leaf and root NSCs indicated effects of N addition on woody plant NSCs allocation through impacts on plant photosynthesis, respiration, and growth. (4) Effects of N addition on leaf and root NSCs varied with plant functional types, where effects were more pronounced in roots than in leaves during the nongrowing season. Overall, our results reveal divergent responses of woody plant leaf and root NSCs to N addition within non-growing season and highlight the role of ecological stoichiometry and plant functional types in woody plant allocation patterns of NSCs in response to ongoing N deposition under global change.

引用

页数：10

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