Response of the fine root production, phenology, and turnover rate of six shrub species from a subtropical forest to a soil moisture gradient and shading

Fu, Xiaoli; Wang, Junlong; Wang, Huimin; Dai, Xiaoqin; Yang, Fengting; Zhao, Mingzhu

doi:10.1007/s11104-015-2686-z

Cited by 21 publications

(6 citation statements)

References 44 publications

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“…Different RTRs also resulted from different dominant species (Tables 1 and 5). For example, it has been reported that forest and tundra RTR variations depend on site-specific species [75,76]. Our results showed there were no significant differences in AMS and AS with respect to similar dominant species (S. purpurea) in this study (Table 1).…”

Section: Root Turnover Ratescontrasting

confidence: 38%

High Below-Ground Productivity Allocation of Alpine Grasslands on the Northern Tibet

Niu

Zeng

Zhang

et al. 2019

Plants

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The allocation of net primary production (NPP) between above- and belowground components is a key step of ecosystem material cycling and energy flows, which determines many critical parameters, e.g., the fraction of below ground NPP (BNPP) to NPP (fBNPP) and root turnover rates (RTR), in vegetation models. However, direct NPP estimation and partition are scarcely based on field measurements of biomass dynamics in the alpine grasslands on the Northern Tibetan Plateau (NTP). Consequently, these parameters are unverifiable and controversial. Here, we measured above- and belowground biomass dynamics (monthly from May to September each year from 2013 to 2015) to estimate NPP dynamics and allocations in four typical alpine grassland ecosystems, i.e., an alpine meadow, alpine meadow steppe, alpine steppe and alpine desert steppe. We found that NPP and its components, above and below ground NPP (ANPP and BNPP), increased significantly from west to east on the NTP, and ANPP was mainly affected by temperature while BNPP and NPP were mainly affected by precipitation. The bulk of BNPP was generally concentrated in the top 10 cm soil layers in all four alpine grasslands (76.1% ± 9.1%, mean ± SD). Our results showed that fBNPP was significantly different among these four alpine grasslands, with its means in alpine meadow (0.93), alpine desert steppe (0.92) being larger than that in the alpine meadow steppe (0.76) and alpine steppe (0.77). Both temperature and precipitation had significant and positive effects on the fBNPP, while their interaction effects were significantly opposite. RTR decreased with increasing precipitation, but increased with increasing temperature across this ecoregion. Our study illustrated that alpine grasslands on the NTP, especially in the alpine meadow and alpine desert steppe, partitioned an unexpected and greater NPP to below ground than most historical reports across global grasslands, indicating a more critical role of the root carbon pool in carbon cycling in alpine grasslands on the NTP.

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Section: Root Turnover Ratescontrasting

confidence: 38%

High Below-Ground Productivity Allocation of Alpine Grasslands on the Northern Tibet

Niu

Zeng

Zhang

et al. 2019

Plants

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“…In nutrient-rich soil, root retention cost can be more than the formation of new roots (Aragao et al, 2009) decaying FR, while in AH system, the slow turnover rate indicated the decreased requirement of carbon for new rood production. Low precipitation creates a water-limited climate for plants and thus results in a powerful response in terms of FRP (Fu et al, 2015). Graefe et al (2008a), Graefe et al (2008b), stated that root growth of the trees is stimulated by higher water availability and seems to act as a second controlling factor after temperature.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of fine roots and soil nitrogen in Mangifera indica‐based agroforestry systems in the Central Himalayan region, India

Karki

Bargali

2022

Land Degrad Dev

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This study estimated seasonal variations among several parameters of the fine roots and N dynamics in Mangifera indica‐based agroforestry systems; we examined homegarden (HG), agri‐horticulture (AH) and agri‐horti‐silviculture (AHS) systems in the Bhabhar area of the Indian Central Himalayan region. Fine roots biomass (FRB) and fine roots production (FRP) of M. indica were highest in the AH system and lowest in the HG system while fine roots turnover (FRT) showed a reverse trend. FRB, FRP and FRT rates decreased with soil depth and distance from the tree base, with larger variations in the AH system. The biomass: necromass ratio varied between 1.91 and 2.42 for HG, between 2.27 and 3.29 for AH and between 2.09 and 2.46 for AHS systems. Among all the selected agroforestry systems, concentrations of mineral N (NH4‐N and NO3‐N) were higher in the AH system and lower in the AHS system while net N mineralization rates were higher in the AHS system. In HGs, FRB it was significantly correlated with ammonification, nitrification and N mineralization while in the AH system it was positively correlated with nitrification and N mineralization. In the AHS system, it was positively correlated with ammonification only. Thus, it can be concluded that in agroforestry systems FRB was enhanced by rapid N mineralization. The variability in FRB and N mineralization between selected agroforestry systems were possibly due to the differences in soil characteristics and management practices. For enrichment of soil nutrients, the contribution of fine roots could be of more importance through the process of decomposition under the prevailing agroforestry systems.

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“…For example, root growth was greater in the dry than in the wet season in an eastern Amazonian forest, because of the lower water availability (Lima et al, 2010). Changing water availability can also affect the peaks and amounts of root growth of understory shrub species in subtropical forests with seasonal droughts (Fu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Unaltered phenology but increased production of ectomycorrhizal roots of Pinus elliottii under 4 years of nitrogen addition

Kou

Wang

et al. 2018

New Phytologist

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Summary Timing (phenology) and amount (production) are two integral facets of root growth, and their shifts have profound influences on below‐ground resource acquisition. However, the environmental control and the effects of nitrogen (N) deposition on the production and phenology of ectomycorrhizal (ECM) roots remain unclear. Using a 4 yr minirhizotron experiment, we explored the control of the production and three phenophases (initiation, peak, and cessation of growth) of ECM roots in two soil layers and investigated their dynamic responses to N addition in a seasonally dry subtropical Pinus elliottii forest. We found a stronger control of water availability on the production and a stronger control of temperature on the phenology of ECM roots under ambient conditions. Temperature was correlated positively with initiation and negatively with cessation, especially in the shallow layer. N addition did not affect the phenology of ECM roots but increased their production by modifying N and phosphorus (P) stoichiometry in the soil and foliage. Our findings suggest a greater sensitivity of production than phenology of ECM roots to N addition. The increased production of ECM roots under N addition could be driven by N‐induced P limitation or some combination of below‐ground resources (P, N, water).

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Response of the fine root production, phenology, and turnover rate of six shrub species from a subtropical forest to a soil moisture gradient and shading

Cited by 21 publications

References 44 publications

High Below-Ground Productivity Allocation of Alpine Grasslands on the Northern Tibet

High Below-Ground Productivity Allocation of Alpine Grasslands on the Northern Tibet

Dynamics of fine roots and soil nitrogen in Mangifera indica‐based agroforestry systems in the Central Himalayan region, India

Unaltered phenology but increased production of ectomycorrhizal roots of Pinus elliottii under 4 years of nitrogen addition

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