New dual in-growth core isotopic technique to assess the root litter carbon input to the soil

Geoderma ◽  
2016 ◽  
Vol 278 ◽  
pp. 32-39 ◽  
Author(s):  
Pietro Panzacchi ◽  
Paola Gioacchini ◽  
Thomas J. Sauer ◽  
Giustino Tonon
Keyword(s):  
Root Litter ◽  
Isotopic Technique

Plant species richness leaves a legacy of enhanced root litter-induced decomposition in soil

2015 ◽  
Vol 80 ◽  
pp. 341-348 ◽  
Author(s):  
Wen-Feng Cong ◽  
Jasper van Ruijven ◽  
Wopke van der Werf ◽  
Gerlinde B. De Deyn ◽  
Liesje Mommer ◽  
...  
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
Plant Species Richness ◽  
Root Litter ◽  
Induced Decomposition

Warming increases soil carbon input in a Sibiraea angustata-dominated alpine shrub ecosystem

2021 ◽  
Author(s):  
Mei Liu ◽  
Jia-Hao Wen ◽  
Ya-Mei Chen ◽  
Wen-Juan Xu ◽  
Qiong Wang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Root Exudates ◽  
Climate Warming ◽  
Root Exudate ◽  
Soil Organic C ◽  
Organic C ◽  
Root Litter ◽  
C Stocks ◽  
Alpine Shrub ◽  
Key Drivers

Abstract Aims Plant-derived carbon (C) inputs via foliar litter, root litter and root exudates are key drivers of soil organic C stocks. However, the responses of these three input pathways to climate warming have rarely been studied in alpine shrublands. Methods By employing a three-year warming experiment (increased by1.3 ℃), we investigated the effects of warming on the relative C contributions from foliar litter, root litter and root exudates from Sibiraea angustata, a dominant shrub species in an alpine shrubland on the eastern Qinghai-Tibetan Plateau. Important Findings The soil organic C inputs from foliar litter, root litter and root exudates were 77.45, 90.58 and 26.94 g C m -2, respectively. Warming only slightly increased the soil organic C inputs from foliar litter and root litter by 8.04 and 11.13 g C m -2, but significantly increased the root exudate C input by 15.40 g C m -2. Warming significantly increased the relative C contributions of root exudates to total C inputs by 4.6% but slightly decreased those of foliar litter and root litter by 2.5% and 2.1%, respectively. Our results highlight that climate warming may stimulate plant-derived C inputs into soils mainly through root exudates rather than litter in alpine shrublands on the Qinghai-Tibetan Plateau.

A simple fluorescent method for quantitative determination of aortic protein uptake

1975 ◽  
Vol 39 (1) ◽  
pp. 145-149 ◽  
Author(s):  
M. E. Katora ◽  
T. M. Hollis
Keyword(s):  
Bovine Serum Albumin ◽  
Wistar Rats ◽  
Fluorescein Isothiocyanate ◽  
Protein Uptake ◽  
Fluorescent Method ◽  
Endothelial Surface ◽  
Net Uptake ◽  
Net Protein ◽  
Isotopic Technique

A quantitative system for direct protein tracing and measurement of net protein uptake in the aorta using fluorescein isothiocyanate conjugated bovine serum albumin (FITCBSA) is described. Using Wistar rats, a mean aortic FITCBSA net uptake of 29.7 times 10(-17) g FITCBSA per mum2 aortic endothelial surface area per 24 h was obtained. Intra-aortic localization of the FITCBSA was observed along the endothelium and the collagen-elastin bands. The values obtained using this FITCBSA system are comparable with those of a previously established isotopic technique measuring aortic albumin flux and reconfirm the previous findings of the existence of an albumin permeability gradient in the thoracic aorta.

scholarly journals Carbon Storage Dynamics of Secondary Forest Succession in the Central Loess Plateau of China

Forests ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. 342 ◽  
Author(s):  
Bin Yang ◽  
Wenhui Zhang ◽  
Yanlei Lu ◽  
Weiwei Zhang ◽  
Yanan Wang
Keyword(s):  
Carbon Storage ◽  
Loess Plateau ◽  
Fine Root ◽  
Early Stage ◽  
Mixed Forest ◽  
Carbon Stocks ◽  
Secondary Forests ◽  
Ecosystem Carbon ◽  
Root Litter ◽  
Ecosystem Carbon Stocks

Research Highlights: This study comprehensively revealed the carbon sequestration characteristics of secondary forests in the central Loess Plateau during vegetation succession. Background and Objectives: The secondary succession of Loess Plateau forests is of great significance in global climate change, but their carbon storage dynamics are poorly understood. The study objectives were to clarify the pattern of changes and contribution level of carbon stocks in various components of ecosystem during succession. Materials and Methods: We selected 18 plots for Pinus tabuliformis Carr. forest at the early stage of succession, 19 for pine-broadleaved mixed forest at the middle stage, and 12 for Quercus-broadleaved mixed forest at the climax stage to determine the tree, shrub, herb, fine root, litter, coarse wood debris (CWD), and soil carbon stocks. Results: Ecosystem carbon stocks increased from 160.73 to 231.14 Mg·ha−1 with the succession stages. Vegetation (including tree, shrub and herb) and soil were the two largest carbon pools, and carbon was mainly sequestrated in tree biomass and shallow soil (0–50 cm). In the early stage, soil contributed more carbon stocks to the ecosystem than vegetation, but with succession, the soil contribution decreased while vegetation contribution increased, finally reaching a balance (46.78% each) at the climax stage. Fine root, litter, and CWD contributed little (average 6.59%) to ecosystem carbon stocks and were mainly involved in the turnover of vegetation biomass to soil carbon. Conclusions: Our results provide direct evidence for carbon sequestration of secondary forests on the Loess Plateau. The dynamic results of carbon storage provide an important basis for forest restoration management under climate change.

Right and left colonic transit after eating assessed by a dual isotopic technique in healthy humans

1992 ◽  
Vol 103 (1) ◽  
pp. 80-85 ◽  
Author(s):  
Laurence Picon ◽  
Marc Lémann ◽  
Bernard Flourié ◽  
Jean-Claude Rambaud ◽  
Jean-Didier Rain ◽  
...  
Keyword(s):  
Colonic Transit ◽  
Healthy Humans ◽  
Isotopic Technique
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