scholarly journals Contribution of root respiration to soil respiration in a rape (Brassica campestris L.) field in Southwest China

2014 ◽  
Vol 60 (No. 1) ◽  
pp. 8-14 ◽  
Author(s):  
Q. Hao ◽  
C. Jiang
Keyword(s):  
Soil Respiration ◽  
Root Respiration ◽  
Southwest China ◽  
Brassica Campestris ◽  
Microbial Respiration ◽  
Belowground Biomass ◽  
Closed Chamber ◽  
Shoot Ratio ◽  
Root Shoot Ratio ◽  
Aboveground And Belowground Biomass

This study aimed to separate the respective contributions of root and microbial respiration to soil respiration in a rape field in Southwest China. The soil respiration was measured with a closed chamber technique and a regression method was used to apportion root and microbial respiration. Microbial and root respiration ranged from 70.67 to 183.77 mg CO<sub>2</sub>/m<sup>2</sup>/h and 21.99 to 193.09 mg CO<sub>2</sub>/m<sup>2</sup>/h, averaged 127.16 and 116.66 mg CO<sub>2</sub>/m<sup>2</sup>/h during the rape growing season, respectively. Root respiration coefficient ranged from 0.41 to 5.39 mg C-CO<sub>2</sub>/g C/h and was negatively correlated with root/shoot ratio, aboveground and belowground biomass, but positively correlated with root N content. The contribution of root respiration to soil respiration averaged 44.2%, ranging from 14.5% to 62.62%.

scholarly journals Evaluation of the effects of various factors on aboveground and belowground biomass storage capacity of eastern mediterranean maquis vegetation

2017 ◽  
Vol 141 (3-4) ◽  
pp. 123-130
Author(s):  
Ali Durkaya ◽  
Sinan Kaptan ◽  
Ali Sabanci ◽  
Birsen Durkaya
Keyword(s):  
Eastern Mediterranean ◽  
Age Factors ◽  
Eastern Mediterranean Region ◽  
Belowground Biomass ◽  
Mean Values ◽  
Biomass Storage ◽  
Vegetation Height ◽  
Root Shoot Ratio ◽  
Aboveground And Belowground Biomass ◽  
Mediterranean Maquis

This study was carried out on the data obtained from 35 plot areas selected among the vertical distribution regions of maquis in study area located in Eastern Mediterranean region. The data were grouped in terms of altitude, dominant exposure, vegetation height, and mean age factors, and it is tried to reveal the change of maquis biomass depending on these factors. The data obtained shown significant variation and, for this reason, the mass values are expressed as mean values. The potential relationship between the mentioned factors and the amounts of stored biomass was examined by using t-test and variation analysis. The mean aboveground biomass amount was found to be 24,183 ton/ha, while mean belowground biomass that doesn’t contain fine root was found to be 41,062 ton/ha. According to these results obtained from mean values, the root/shoot ratio was calculated to be 1.7.

scholarly journals Estimating belowground biomass and root/shoot ratio of Phillyrea latifolia L. in the Mediterranean forest landscapes

2015 ◽  
Vol 72 (5) ◽  
pp. 585-593 ◽  
Author(s):  
Pasquale A. Marziliano ◽  
Raffaele Lafortezza ◽  
Umberto Medicamento ◽  
Leonardo Lorusso ◽  
Vicenzo Giannico ◽  
...  
Keyword(s):  
Belowground Biomass ◽  
Mediterranean Forest ◽  
Shoot Ratio ◽  
Phillyrea Latifolia ◽  
Root Shoot Ratio ◽  
The Mediterranean

Seasonal patterns of soil respiration in intact and clear-cut northern hardwood forests

1994 ◽  
Vol 24 (8) ◽  
pp. 1711-1716 ◽  
Author(s):  
David E. Toland ◽  
Donald R. Zak
Keyword(s):  
Soil Respiration ◽  
Root Respiration ◽  
Microbial Respiration ◽  
Late Summer ◽  
Soda Lime ◽  
Forest Harvesting ◽  
Seasonal Patterns ◽  
Soil C ◽  
Northern Hardwood ◽  
Clear Cut

The flux of CO2 from forest soils is controlled by the respiration of plant roots and soil microorganisms, the rates of which are likely to change following forest harvesting. Root respiration should decrease, whereas microbial respiration should increase, in response to warmer soil temperatures and greater soil C availability following removal of the overstory. We investigated the influence of forest harvesting on seasonal patterns of soil respiration in two different northern hardwood ecosystems. One ecosystem was dominated in the overstory by Acersaccharum Marsh, and Quercusrubra L., and the other by A. saccharum and Tiliaamericana L.; two stands were studied in each ecosystem type. We measured daily rates of soil respiration using the soda-lime technique. Averaged across ecosystems, daily rates of soil respiration did not significantly differ between intact and clear-cut plots, nor did they differ between ecosystems or sites nested within ecosystems. Peak daily rates ranged from 2.75 to 3.00 g CO2-C•m−2•day−1 during mid to late summer in both intact and clear-cut plots. Soil temperature accounted for 43 and 58% of the variation in daily rates for intact and clear-cut plots, respectively. Annual soil respiration rates in intact (478 g CO2-C•m−2•year−1) and clear-cut (470 g CO2-C•m−1•year−1) plots did not differ significantly. Our results suggest that greater rates of microbial respiration in clear-cut plots proportionally offset a decrease in root respiration following clear-cut harvest.

Growth and biomass of siberian elm seedlings (Ulmus pumila L.) grown in tree nursery

2020 ◽  
Vol 30 (2) ◽  
pp. 32-37
Author(s):  
Gan-Erdene Batsaikhan ◽  
Myadagmaa Suren ◽  
Batdorj Enkhbayar ◽  
Delgerjargal Dugarjav
Keyword(s):  
Belowground Biomass ◽  
Allometric Equation ◽  
Biomass Estimation ◽  
Degraded Land ◽  
Ulmus Pumila ◽  
Tree Nursery ◽  
Shoot Ratio ◽  
Root Shoot Ratio ◽  
High Prediction ◽  
Relationship Of

In this paper, we studied growth and biomass of 1-2 years old Siberian elm seedlings grown in the tree nursery, near Ulaanbaatar, Mongolia. Ulmus pumila L. has a wide natural distribution throughout the country. Due to climate change and other factors, environmental degradation has become inevitable in the country and efforts to restore degraded land are made in different regions. Due to its drought and cold resistance, Siberian elm is considered to be one of the most suitable species of tree to be used for restoration and windbreaks. We measured height, diameter and biomass of 1-2 year old seedlings, and composed allometric equation to estimate aboveground and belowground biomass. Equations have high prediction power (R2=0.80-0.96), however, they are more suitable to seedlings and saplings due to difference in the allometric relationship of trees at different ages. We also explored relationship between diameter (at root collar) and height, which was fairly good (R2=0.73). In order to be able to use the equation to indirectly estimate belowground biomass of seedlings, we estimated Root/shoot ratio of seedlings. Root/shoot ratio was 0.85 for 1-2-year-old seedlings. Belowground biomass estimation can be useful in determining how well the tree can fix soil around it, and draw water and nutrients from the soil. The result of the study can be used for further work concerning the viability of Siberian elm for restoration and windbreaks.

scholarly journals Erratum to: Estimating belowground biomass and root/shoot ratio of Phillyrea latifolia L. in the Mediterranean forest landscapes

2017 ◽  
Vol 74 (2) ◽  
Author(s):  
Pasquale A. Marziliano ◽  
Raffaele Lafortezza ◽  
Umberto Medicamento ◽  
Leonardo Lorusso ◽  
Vincenzo Giannico ◽  
...  
Keyword(s):  
Belowground Biomass ◽  
Mediterranean Forest ◽  
Shoot Ratio ◽  
Phillyrea Latifolia ◽  
Root Shoot Ratio ◽  
The Mediterranean

Root biomass, root:shoot ratio and belowground carbon stocks in the open savannahs of Roraima, Brazilian Amazonia

2012 ◽  
Vol 60 (5) ◽  
pp. 405 ◽  
Author(s):  
Reinaldo Imbrozio Barbosa ◽  
Jhonson Reginaldo Silva dos Santos ◽  
Mariana Souza da Cunha ◽  
Tania Pena Pimentel ◽  
Philip Martin Fearnside
Keyword(s):  
Belowground Biomass ◽  
Carbon Stocks ◽  
Permanent Plots ◽  
Intergovernmental Panel ◽  
Dry Grasslands ◽  
Shoot Ratio ◽  
Root Shoot Ratio ◽  
Wet Grasslands ◽  
Extreme North ◽  
Seasonally Flooded

Biomass of roots, the root : shoot ratio (ratio of below- to aboveground biomass) and carbon stocks belowground (to 100-cm depth) were estimated in different open savannah environments in the extreme north of the Brazilian Amazon. Sampling was conducted in permanent plots established in two open savannah areas in the state of Roraima. We identified four phytopedounits in the 27 plots sampled in two areas: four in dry grasslands on Argisol/Ultisol soils (DG-Arg), eight in dry grasslands on Latosol/Oxisol soils (DG-Lts), five in a mosaic of grasslands with savannah-parkland on Latosol/Oxisol soils (GP-Lts) and 10 in seasonally flooded (wet) grasslands on Hydromorphic/Entisol soils (WG-Hyd). Fine roots (<2 mm diameter) dominated the 0–100-cm vertical profile in the four phytopedounits (>92.5%). Biomass of the roots in WG-Hyd (29.52 ± 7.15 Mg ha–1) was significantly higher as compared with the other phytopedounits studied, although the carbon stocks did not differ among the phytopedounits (6.20–7.21 MgC ha–1). The largest concentration of roots was found in the upper three 10-cm sections of the soil profile, ranging from 56.3 to 82.9% in the four environments. The root : shoot ratio based only on living biomass of roots with diameter ≥2 mm (standard Intergovernmental Panel on Climate Change methodology) ranged from 0 for seasonally flooded grasslands to 0.07–0.20 for unflooded grasslands on clay soils. The results indicate that the root : shoot ratio (expansion factor) for belowground biomass in open savannah ecosystems in the northern Amazon are low and differ from the default values used in Brazil’s reference report to the Climate Convention.

Effects of Single-seed Sowing on Root Growth, Root-shoot Ratio, and Yield inPeanut (Arachis hypogacaL.)

2013 ◽  
Vol 39 (12) ◽  
pp. 2228 ◽  
Author(s):  
Ye FENG ◽  
Feng GUO ◽  
Bao-Long LI ◽  
Jing-Jing MENG ◽  
Xin-Guo LI ◽  
...  
Keyword(s):  
Root Growth ◽  
Single Seed ◽  
Shoot Ratio ◽  
Root Shoot Ratio ◽  
Seed Sowing

Root-shoot ratio in irrigated plants

1965 ◽  
Vol 7 (2) ◽  
pp. 129-135 ◽  
Author(s):  
Miroslav Penka
Keyword(s):  
Shoot Ratio ◽  
Root Shoot Ratio

scholarly journals Historical climate controls soil respiration responses to current soil moisture

2017 ◽  
Vol 114 (24) ◽  
pp. 6322-6327 ◽  
Author(s):  
Christine V. Hawkes ◽  
Bonnie G. Waring ◽  
Jennifer D. Rocca ◽  
Stephanie N. Kivlin
Keyword(s):  
Climate Change ◽  
Soil Moisture ◽  
Soil Respiration ◽  
Carbon Cycling ◽  
Large Scale ◽  
Microbial Respiration ◽  
Rainfall Gradient ◽  
Soil Microbial ◽  
Historical Climate ◽  
Moisture Dependence

Ecosystem carbon losses from soil microbial respiration are a key component of global carbon cycling, resulting in the transfer of 40–70 Pg carbon from soil to the atmosphere each year. Because these microbial processes can feed back to climate change, understanding respiration responses to environmental factors is necessary for improved projections. We focus on respiration responses to soil moisture, which remain unresolved in ecosystem models. A common assumption of large-scale models is that soil microorganisms respond to moisture in the same way, regardless of location or climate. Here, we show that soil respiration is constrained by historical climate. We find that historical rainfall controls both the moisture dependence and sensitivity of respiration. Moisture sensitivity, defined as the slope of respiration vs. moisture, increased fourfold across a 480-mm rainfall gradient, resulting in twofold greater carbon loss on average in historically wetter soils compared with historically drier soils. The respiration–moisture relationship was resistant to environmental change in field common gardens and field rainfall manipulations, supporting a persistent effect of historical climate on microbial respiration. Based on these results, predicting future carbon cycling with climate change will require an understanding of the spatial variation and temporal lags in microbial responses created by historical rainfall.

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