Root order-dependent seasonal dynamics in the carbon and nitrogen chemistry of poplar fine roots

doi:10.1007/s11056-017-9587-3

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Root order-dependent seasonal dynamics in the carbon and nitrogen chemistry of poplar fine roots
	Chen, Hongying 1; Dong, Yufeng 2; Xu, Tan 3; Wang, Yanping 1; Wang, Huatian 1; Duan, Baoli4
刊名	NEW FORESTS
	2017-09-01
卷号	48 期号:5 页码:587-607
关键词	Seasonal Dynamics Carbon And Nitrogen Chemistry Root Order Poplar Plantation
ISSN号	0169-4286
DOI	10.1007/s11056-017-9587-3
通讯作者	Yanping Wang
英文摘要	Fine roots play an important role in above- and belowground carbon (C) allocation in forest ecosystems. However, few studies have focused on the seasonal dynamics of fine roots with different branching orders. The objective of this study is to provide insight to the seasonal heterogeneity in roots of different orders within root hierarchies of poplar trees under different soil conditions. Three plots were established in high (plantation A) and low (plantation B) soil nutrient conditions. Fine roots were sampled in each of four seasons throughout one year. All sampled roots were classified into one to five groups depending on their branching order, and the dry biomass of living roots and the concentrations of C, nitrogen (N) and total non-structural carbohydrate (TNC) were examined. Low order (first- to second-order) roots demonstrated more significant seasonal dynamics than high order roots, and the biomass of first-order fine roots was positively influenced by soil temperature and moisture while the biomass of second-order fine roots was negatively affected by soil nutrient conditions. The different responses of fine roots to environmental fluctuations implied a high division of root function, even within low order roots. The C and N chemistry of poplar fine roots also differed significantly with branching order; element concentrations were lower in low order roots. Principal component analysis indicated that root order explained 98.2% of the variation in fine root chemistry. Moreover, the first-order roots in plantation A had greater C but less TNC concentrations than those in plantation B, suggesting that C allocation in low order roots may be more responsive to soil nutrient conditions. The allocation of C and N also exhibited significant seasonal dynamics (p < 0.05); the TNC concentration was highest in winter, whereas C:N ratios were significantly lower in the summer and fall in each order of fine roots (p < 0.05). All these results suggest that branching order may be related to root growth and photoassimilate allocation, which should receive greater attention in future studies on C and N fluxes in forest ecosystems.
语种	英语
WOS记录号	WOS:000406877100002
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/19015]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
作者单位	1.Shandong Agr Univ, Taishan Forest Ecosystem Res Stn, Coll Forestry, State Forestry Adm, 61 Daizong St, Tai An 271018, Shandong, Peoples R China 2.Shandong Acad Forestry, Jinan 250014, Shandong, Peoples R China 3.Beijing Forestry Univ, Coll Forestry, Beijing 100083, Peoples R China 4.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China
推荐引用方式 GB/T 7714	Chen, Hongying,Dong, Yufeng,Xu, Tan,et al. Root order-dependent seasonal dynamics in the carbon and nitrogen chemistry of poplar fine roots[J]. NEW FORESTS,2017,48(5):587-607.
APA	Chen, Hongying,Dong, Yufeng,Xu, Tan,Wang, Yanping,Wang, Huatian,&Duan, Baoli.(2017).Root order-dependent seasonal dynamics in the carbon and nitrogen chemistry of poplar fine roots.NEW FORESTS,48(5),587-607.
MLA	Chen, Hongying,et al."Root order-dependent seasonal dynamics in the carbon and nitrogen chemistry of poplar fine roots".NEW FORESTS 48.5(2017):587-607.