scholarly journals Effect of nitrogen fertilizer, root branch order and temperature on respiration and tissue N concentration of fine roots in Larix gmelinii and Fraxinus mandshurica

2011 ◽  
Vol 31 (7) ◽  
pp. 718-726 ◽  
Author(s):  
S. Jia ◽  
Z. Wang ◽  
X. Li ◽  
X. Zhang ◽  
N. B. Mclaughlin
Keyword(s):  
Nitrogen Fertilizer ◽  
Fine Roots ◽  
Larix Gmelinii ◽  
Fraxinus Mandshurica ◽  
Branch Order ◽  
Root Branch Order ◽  
N Concentration

scholarly journals Differential variation of NSCs in root branch orders of Fraxinus mandshurica Rupr. seedlings across different drought intensities and soil substrates

2021 ◽  
Author(s):  
Li Ji ◽  
Yue Liu ◽  
Jun Wang ◽  
Zhimin Lu ◽  
Yuchun Yang ◽  
...  
Keyword(s):  
Fine Roots ◽  
Fine Root ◽  
Sandy Loam ◽  
Starch Content ◽  
Soluble Sugar ◽  
Root Traits ◽  
Drought Intensity ◽  
Branch Order ◽  
Root Branch Order ◽  
Loam Soil

Non-structural carbohydrates (NSCs) facilitate plants adapt to drought stress, could characterize trees growth and survival ability and buffer against external disturbances. Previous studies have focused on the distribution and dynamics of NSCs among different plant organs under drought conditions. However, discussion about the NSC levels of fine roots in different root branch order were little, especially the relationship between fine root trait variation and NSCs content. The aim of the study is to shed light into the synergistic variation of fine root traits and NSC content in different root branch order under different drought and soil substrate conditions. 2-year-old Fraxinus mandshurica Rupr. potted seedlings were planted in three different soil substrates (humus, loam and sandy-loam soil) and conducted to four drought intensities (CK, mild drought, moderate drought and severe drought) for two months. With the increase of drought intensity, the biomass of fine roots decreased significantly. Under the same drought intensity, seedlings in sandy-loam soil have higher root biomass, and the coefficient of variation of fifth-order roots (37.4%, 44.5% and 53.0% in humus, loam and sandy loam, respectively) is higher than that of lower-order roots. With the increase of drought intensity, the specific root length (SRL) and average diameter (AD) of all five orders increased and decreased, respectively. The fine roots in humus soil had higher soluble sugar content and lower starch content. Also, the soluble sugar and starch content of fine roots showed decreasing and increasing tendency respectively. Soluble sugar and starch explain the highest degree of total variation of fine root traits, that is 32.0% and 32.1% respectively. With ascending root order, the explanation of the variation of root traits by starch decreased (only 6.8% for fifth-order roots). The response of different root branch order fine root morphological traits of F. mandshurica seedlings to resource fluctuations ensures that plants maintain and constructure the root development by an economical way to obtain more resources.

scholarly journals ESTIMATING FINE_ROOT LONGEVITY OF FRAXINUS MANDSHURICAAND LARIX GMELINII USING MINI-RHIZOTRONS

2007 ◽  
Vol 31 (1) ◽  
pp. 102-109 ◽  
Author(s):  
YU Shui-Qiang ◽  
◽  
WANG Zheng-Quan ◽  
SHI Jian-Wei ◽  
QUAN Xian-Kui ◽  
...  
Keyword(s):  
Larix Gmelinii ◽  
Fraxinus Mandshurica

scholarly journals Decomposition and Temperature Sensitivity of Fine Root and Leaf Litter of 43 Mediterranean Species

2021 ◽  
Author(s):  
Giuliano Bonanomi ◽  
Mohamed Idbella ◽  
Maurizio Zotti ◽  
Lucia Santorufo ◽  
Riccardo Motti ◽  
...  
Keyword(s):  
Decay Rate ◽  
Leaf Litter ◽  
Temperature Sensitivity ◽  
Decomposition Rate ◽  
Fine Roots ◽  
Fine Root ◽  
Mediterranean Species ◽  
Lignin Concentration ◽  
N Concentration ◽  
Root Litter

Abstract Aims: Data on the decomposition of fine roots are scarce for the Mediterranean basin. This work aims to compare chemical traits, decomposition rate, and temperature sensitivity (Q10) for root and leaf litter of 43 Mediterranean species. Methods: We carried out a two-years litterbag decomposition experiment using 43 fine roots litter and leaf litter types incubated in laboratory conditions at three different temperatures, i.e. 4°C, 14°C, and 24°C. Litter was characterized for carbon (C), nitrogen (N), lignin and cellulose concentration, C/N, and lignin/N ratios. Results: Fine root litter had lower N content but higher lignin concentration, lignin/N, and C/N ratios compared to leaf litter. The decay rate of fine root litter was slower than leaf litter. For both tissues, the decay rate was negatively associated with lignin concentration, lignin/N, and C/N ratios but positively with N concentration. Q10 was higher for fine root than leaf litter, with a positive correlation with lignin while negative with N concentration. Conclusions: Our findings demonstrate a higher Q10 accompanied by a slower decomposition rate of fine root litter compared to leaf litter in Mediterranean ecosystems. These results must be considered in modeling organic C at the ecosystem scale.

scholarly journals Endogenous and exogenous controls of root life span, mortality and nitrogen flux in a longleaf pine forest: root branch order predominates

2008 ◽  
Vol 96 (4) ◽  
pp. 737-745 ◽  
Author(s):  
Dali Guo ◽  
Robert J. Mitchell ◽  
Jennifer M. Withington ◽  
Ping-Ping Fan ◽  
Joseph J. Hendricks
Keyword(s):  
Life Span ◽  
Longleaf Pine ◽  
Pine Forest ◽  
Nitrogen Flux ◽  
Branch Order ◽  
Root Branch Order ◽  
Root Life Span

scholarly journals The Effects of Rehydration Time on Pressure-Volume Curves of Larix gmelinii and Fraxinus mandshurica in Northeast China

2016 ◽  
Vol 62 (4) ◽  
pp. 385-391
Author(s):  
Liu Yang ◽  
Robert O. Teskey ◽  
Huizhen Sun
Keyword(s):  
Northeast China ◽  
Larix Gmelinii ◽  
Fraxinus Mandshurica

Spatial–temporal variations of absorptive fine roots in the organic and soil layers of a Larix gmelinii forest

Trees ◽  
2021 ◽  
Author(s):  
Guoqiang Gao ◽  
Marc Goebel ◽  
Yan Wang ◽  
Zhengquan Wang ◽  
Jiacun Gu
Keyword(s):  
Fine Roots ◽  
Temporal Variations ◽  
Larix Gmelinii ◽  
Soil Layers

scholarly journals Decomposition and temperature sensitivity of fine root and leaf litter of 43 mediterranean species

2021 ◽  
Author(s):  
Giuliano Bonanomi ◽  
Mohamed Idbella ◽  
Maurizio Zotti ◽  
Lucia Santorufo ◽  
Riccardo Motti ◽  
...  
Keyword(s):  
Decay Rate ◽  
Leaf Litter ◽  
Temperature Sensitivity ◽  
Decomposition Rate ◽  
Fine Roots ◽  
Fine Root ◽  
Mediterranean Species ◽  
Lignin Concentration ◽  
N Concentration ◽  
Root Litter

Abstract Aims Data on the decomposition of fine roots are scarce for the Mediterranean basin. This work aims to compare chemical traits, decomposition rate, and temperature sensitivity (Q10) for root and leaf litter of 43 Mediterranean species. Methods We carried out a two-years litterbag decomposition experiment using 43 fine roots litter and leaf litter types incubated in laboratory conditions at three different temperatures, i.e. 4 °C, 14 °C, and 24 °C. Litter was characterized for carbon (C), nitrogen (N), lignin and cellulose concentration, C/N, and lignin/N ratios. Results Fine root litter had lower N content but higher lignin concentration, lignin/N, and C/N ratios compared to leaf litter. The decay rate of fine root litter was slower than leaf litter. For both tissues, the decay rate was negatively associated with lignin concentration, lignin/N, and C/N ratios but positively with N concentration. Q10 was higher for fine root than leaf litter, with a positive correlation with lignin while negative with N concentration. Conclusions Our findings demonstrate a higher Q10 accompanied by a slower decomposition rate of fine root litter compared to leaf litter in Mediterranean ecosystems. These results must be considered in modeling organic C at the ecosystem scale.

ESTIMATING FINE ROOT PRODUCTION, MORTALITY AND TURNOVER WITH MINIRHIZOTRONS IN LARIX GMELINIIAND FRAXINUS MANDSHURICA PLANTATIONS

2007 ◽  
Vol 31 (2) ◽  
pp. 333-342 ◽  
Author(s):  
SHI Jian-Wei ◽  
◽  
WANG Zheng-Quan ◽  
YU Shui-Qiang ◽  
QUAN Xian-Kui ◽  
...  
Keyword(s):  
Fine Root ◽  
Larix Gmelinii ◽  
Root Production ◽  
Fine Root Production ◽  
Fraxinus Mandshurica

The relationship of soil mineral NO3-N with stem NO3-N concentration, and of fertilizer-N with the amount of nitrogen taken up by winter wheat, in experiments testing nitrogen fertilizer in combination with aphicide and fungicides, from 1980 to 1982

1986 ◽  
Vol 106 (3) ◽  
pp. 497-507 ◽  
Author(s):  
R. J. Darby ◽  
F. V. Widdowson ◽  
E. Bird ◽  
M. V. Hewitt
Keyword(s):  
Winter Wheat ◽  
Nitrogen Fertilizer ◽  
Seedling Emergence ◽  
Nitrogen Efficiency ◽  
Fertilizer N ◽  
Soil Mineral ◽  
Mineral N ◽  
Fertilizer Nitrogen ◽  
N Concentration ◽  
Relationship Of

SummaryExperiments on winter wheat were made from 1980 to 1982 to test fungicide and aphicide sprays in factorial combination with four amounts of nitrogen fertilizer, applied in either one or two dressings in spring. The wheat was grown on three farms with contrasting calcareous clay soils from three soil series; each year it followed a 2-year break on one farm, a cereal rotation on the second and continuous wheat on the third. Soils were sampled to a depth of 0·9 m at seedling emergence in autumn, and again in February and April, to determine the NO3-N and NH4-N in each 0·3 m horizon. Crops were sampled for growth analysis at monthly intervals from March onwards and analysed for nitrogen content. Measurements of stem sap NO3-N concentration were also made at 2-weekly intervals from February or March to late June.Measurements of soil mineral N were used to calculate the fertilizer nitrogen dressings used in the experiments. The concentration of NO3-N in the stem sap was related to NO3-N in soil; concentiations remained high until most of the soil NO3-N had been removed by the crop. The time at which stem sap NO3-N concentration declined therefore acted as an index of soil N supply, and the data showed that fertilizer-N was needed when the NO3-N concentration fell below a 200 μg/ml threshold. Yields benefited from N applied in February or March only when stem sap NO3-N concentration fell below the threshold at this time.Apparent fertilizer nitrogen efficiency exceeded 70 % where yields were very large, but ranged between 53 and 64% where yields were smaller because either soil physical problems or disease restraints were present.A severe attack by take-all (Gaeumannomyces cerealis) caused premature senescence at one centre in 1980; this apparently prevented previously assimilated nitrogen from moving into the grain.

Sign in / Sign up

Export Citation Format

Share Document