Fine Roots in Northern Forests: Response to Atmospheric N Deposition Increase and Temperature Rise

doi:10.11924/j.issn.1000-6850.casb18120133

Abstract

Abstract:

Under the background of increasing atmospheric N deposition and rising temperature, the potential changes of production and physiology and ecology of fine root will affect nutrient supply and terrestrial C cycle in forest soil. Based on 170 sets of data from 34 published papers on N deposition, temperature rise and their interaction in northern forests, we studied the responses of fine roots to warming, increasing N and their interaction by meta analysis. The results showed that: (1) increasing N significantly inhibited the biomass of fine roots and increased the content of C and N in fine roots, while decreased P significantly, the respiration rate of fine roots increased significantly, and the morphology of fine roots became slender; (2) warming significantly increased the availability of soil C, the biomass, tissue density, N uptake rate, tissue N concentration and respiration of fine roots, but the content of C and N, specific root length, diameter and respiration rate of fine roots decreased with the increase of temperature; (3) under the interaction of rising temperature and increasing N, the biomass, respiration rate and the content of C, N of fine roots increased significantly except the inhibition of tissue N concentration. The results show that the rising temperature and increasing N significantly affect the biomass, turnover, nutrient content and morphological characteristics of fine roots in northern forests, and could provide reference and data support for improving and perfecting the C budget model.

Key words: fine root, N deposition, temperature rise, morphological structure, physiological function, meta analysis

CLC Number:

X171.1

Ding Lizhi, Xing Yajuan, Yan Guoyong, Wang Qinggui. Fine Roots in Northern Forests: Response to Atmospheric N Deposition Increase and Temperature Rise[J]. Chinese Agricultural Science Bulletin, 2020, 36(11): 63-73.

Figures/Tables 3

References 78

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