Spacial patterns of fine root abundance in mixed larch-ash plantation

1997 ◽  
Vol 8 (4) ◽  
pp. 206-210 ◽  
Author(s):  
Cui Xiaoyang
Keyword(s):  
Fine Root ◽  
Root Abundance

scholarly journals Variation in fine root traits with thinning intensity in a Chinese fir plantation insights from branching order and functional groups

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zuhua Wang ◽  
Min Liu ◽  
Fen Chen ◽  
Haibo Li
Keyword(s):  
Total Variation ◽  
Functional Groups ◽  
Root Length ◽  
Fine Root ◽  
Root Traits ◽  
Foraging Strategy ◽  
Chinese Fir ◽  
Thinning Intensity ◽  
Absorptive Roots ◽  
Root Abundance

AbstractThinning is a widely used practice in forest management, but the acclimation mechanisms of fine roots to forest thinning are still unclear. We examined the variations in fine root traits of different branching orders and functional groups along a thinning intensity gradient in a 26-year-old Chinese fir (Cunninghamia lanceolata) plantation. With increasing thinning intensity, the root C concentration (RCC), root N concentration (RNC), specific root area (SRA), and specific root length (SRL) of the absorptive roots (the first two orders) significantly decreased, while root abundance (root biomass and root length density) and root tissue density (RTD) significantly increased. Fifty-four percent of the variation in the absorptive root traits could be explained by the soil N concentration and the biomass and diversity of the understorey vegetation. Conversely, transport root (third- and higher-order) traits did not vary significantly among different thinning intensities. The covariation of absorptive root traits across thinning intensities regarding two dimensions was as follows: the first dimension (46% of the total variation) represented changes in root abundance and chemical traits (related to RCC, RNC), belonging to an extensive foraging strategy; the second dimension (41% of the total variation) represented variations in root morphological traits (related to RTD, SRL and SRA), which is an intensive foraging strategy (i.e., root economic spectrum). These results suggested that the absorptive roots of Chinese fir adopt two-dimensional strategies to acclimate to the altered surroundings after thinning.

Fine root exudation rate increases in drier soils, but tree level carbon exudation does not change under drought in mature Fagus sylvatica - Picea abies trees

2021 ◽  
Author(s):  
Benjamin D. Hafner ◽  
Melanie Brunn ◽  
Marie J. Zwetsloot ◽  
Kyohsuke Hikino ◽  
Karin Pritsch ◽  
...  
Keyword(s):  
Picea Abies ◽  
Fagus Sylvatica ◽  
Forest Ecosystems ◽  
Fine Root ◽  
Carbon Allocation ◽  
Root Exudation ◽  
Total Carbon ◽  
Tree Level ◽  
Root Abundance ◽  
Exudation Rate

<div><span>Drought is a severe natural risk that increases drying-rewetting frequencies of soils. Yet, it remains largely unknown how forest ecosystems respond to dry-wet cycles, hampering our ability to evaluate the overall sink and source functionality for this large carbon pool. Recent investigations suggest that the release of soluble carbon via root exudation increases under drought, influencing soil carbon stabilization and mineralization. However, an integration of root exudation into the carbon allocation dynamics of drought stressed trees is missing. We hypothesized that roots in dry soil layers have a higher exudation rate than roots in more moist layers across different soil depths. Further, we tested if higher exudation rates under drought are attenuated by reduced root abundance in dry soils and if the fraction of root exudation from total carbon allocation increases with decreasing photosynthesis rates under drought. At the KROOF experimental site in southern Germany, where mature beech (<em>Fagus sylvatica </em>L.) and spruce (<em>Picea abies </em>(L.) Karst.) trees were exposed to artificial drought stress for five consecutive growing seasons, we show that at the root level root exudation rate increases in drier soils. Especially roots in the upper soil profile and roots of spruce trees increased root exudation under drought. When scaled to whole tree level, we did not find differences in total exudation between drought stressed and control trees, indicating sustained root exudation at the tree level under drought. As photosynthesis rates and therefore total carbon assimilation was substantially reduced under drought (by 50 % in beech and almost 70 % in spruce), the fraction of root exudation from total assimilation slightly increased for drought stressed trees. Our results demonstrate that stimulation of root exudation rates with drought exists in natural temperate forest ecosystems but might be mitigated by reduced fine root abundance under drought. Nevertheless, increased exudation per root surface area will have localized impacts on rhizosphere microbial composition and activity especially in the topsoil exposed to more extreme dry-wet cycles. Finally, also the exudate composition can help to determine how priming of soil organic matter relates to belowground carbon allocation dynamics and to disclose processes of complementary species interaction and should be emphasised in future studies. </span></div>

scholarly journals Soil type more than precipitation determines fine-root abundance in savannas of Kruger National Park, South Africa

2017 ◽  
Vol 417 (1-2) ◽  
pp. 523-533 ◽  
Author(s):  
Andrew Kulmatiski ◽  
Sydney R. C. Sprouse ◽  
Karen H. Beard
Keyword(s):  
South Africa ◽  
Soil Type ◽  
National Park ◽  
Fine Root ◽  
Kruger National Park ◽  
Root Abundance

scholarly journals Fine Root Abundance and Dynamics of Stone Pine (Pinus cembra) at the Alpine Treeline Is Not Impaired by Self-shading

2017 ◽  
Vol 8 ◽  
Author(s):  
Petra Kubisch ◽  
Christoph Leuschner ◽  
Heinz Coners ◽  
Andreas Gruber ◽  
Dietrich Hertel
Keyword(s):  
Fine Root ◽  
Pinus Cembra ◽  
Stone Pine ◽  
Alpine Treeline ◽  
Root Abundance

Effects of defoliation on current-year stem growth and fine root dynamics in Fraxinus mandschurica and Larix gmelinii seedlings

2014 ◽  
Vol 38 (10) ◽  
pp. 1082-1092 ◽  
Author(s):  
LI Jun-Nan ◽  
◽  
WANG Wen-Na ◽  
XIE Ling-Zhi ◽  
WANG Zheng-Quan ◽  
...  
Keyword(s):  
Fine Root ◽  
Stem Growth ◽  
Larix Gmelinii ◽  
Root Dynamics ◽  
Fine Root Dynamics

Effects of thinning on fine root biomass and carbon storage of subalpine Picea asperata plantation in Western Sichuan Province, China

2013 ◽  
Vol 36 (7) ◽  
pp. 645-654 ◽  
Author(s):  
Yun-Ke LIU ◽  
Chuan FAN ◽  
Xian-Wei LI ◽  
Yin-Hua LING ◽  
Yi-Gui ZHOU ◽  
...  
Keyword(s):  
Carbon Storage ◽  
Root Biomass ◽  
Fine Root ◽  
Fine Root Biomass ◽  
Sichuan Province ◽  
Western Sichuan ◽  
Picea Asperata
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