Pattern and process in above‐ground and below‐ground components of grassland ecosystems

Titlyanova, A. A.; Romanova, I. P.; Kosykh, Natalia P.; Миронычева-Токарева, Н. П.

doi:10.2307/3237060

Cited by 92 publications

(79 citation statements)

References 16 publications

(13 reference statements)

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“…The fastest growth of below-ground organs can occur in different parts of growing season reflecting the annual cycle of vegetative activity (Titlyanova et al 1999). In the present study, mostly significantly higher values of RNPP were assessed in the first half of the 1992 growing season through all treatments.…”

Section: Results and Duscussionmentioning

confidence: 45%

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Effect of fertilization on root growth in the wet submontane meadow

Holub¹,

Tůma²,

Fiala³

2013

PLANT SOIL ENVIRON

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Root net primary productivity (RNPP) was assessed in the wet submontane meadow in the highland region of the Czech Republic. RNPP was studied from 1992 to 1995 with help of the in-growth core technique. The effect of different intensities of fertilization on root growth was covered. In comparison with unfertilized stands, the application of fertilizers (90 kg N/ha) resulted, mostly significantly, in greater root productivity (297 g/m 2 /year and 2.08 g/m 2 /day, on average). This represented an increase by 72% and 71%, respectively. Variability in the fraction of RNPP to total net primary productivity was examined. Results indicate that this fraction varied from 0.18 to 0.25 across the compared treatments and decreased with increasing fertilization. Data show how different roles can grasslands play in accumulation of plant matter due to different levels of fertilization.

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Section: Results and Duscussionmentioning

confidence: 45%

“…Only a few studies related below-ground primary production (BNPP) with climate variables and, in addition, contradictory data on root growth and below-ground biomass were published (e.g. Ibrahim et al 1997, Titlyanova et al 1999, Gill et al 2002, Hejduk and Hrabě 2003.…”

mentioning

confidence: 99%

Effect of fertilization on root growth in the wet submontane meadow

Holub¹,

Tůma²,

Fiala³

2013

PLANT SOIL ENVIRON

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“…3), one might argue that aboveground biomass is a poor proxy for soil OC input. However, under the assumption that root residue inputs are correlated with the aboveground biomass (evidence is given by Titlyanova et al, 1999, who observed significant correlations (p < 0.01, R > 0.5) between the aboveground and belowground biomass of typical plants in Siberian grasslands), one can conclude that both aboveground and belowground soil OC inputs were comparable between all three soil types. Wong et al (2010) argued that small OC stocks in saltaffected soils can also be the result of erosion-induced OC losses, as sodic soils are particularly prone to erosion.…”

Section: Soil Oc Stocks Along the Salinity Gradientmentioning

confidence: 92%

Organic matter dynamics along a salinity gradient in Siberian steppe soils

et al. 2018

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Abstract. Salt-affected soils will become more frequent in the next decades as arid and semiarid ecosystems are predicted to expand as a result of climate change. Nevertheless, little is known about organic matter (OM) dynamics in these soils, though OM is crucial for soil fertility and represents an important carbon sink. We aimed at investigating OM dynamics along a salinity and sodicity gradient in the soils of the southwestern Siberian Kulunda steppe (Kastanozem, non-sodic Solonchak, Sodic Solonchak) by assessing the organic carbon (OC) stocks, the quantity and quality of particulate and mineral-associated OM in terms of non-cellulosic neutral sugar contents and carbon isotopes (δ 13 C, 14 C activity), and the microbial community composition based on phospholipid fatty acid (PLFA) patterns. Aboveground biomass was measured as a proxy for plant growth and soil OC inputs. Our hypotheses were that (i) soil OC stocks decrease along the salinity gradient, (ii) the proportion and stability of particulate OM is larger in salt-affected Solonchaks compared to non-salt-affected Kastanozems, (iii) sodicity reduces the proportion and stability of mineral-associated OM, and (iv) the fungi : bacteria ratio is negatively correlated with salinity. Against our first hypothesis, OC stocks increased along the salinity gradient with the most pronounced differences between topsoils. In contrast to our second hypothesis, the proportion of particulate OM was unaffected by salinity, thereby accounting for only < 10 % in all three soil types, while mineral-associated OM contributed > 90 %. Isotopic data (δ 13 C, 14 C activity) and neutral sugars in the OM fractions indicated a comparable degree of OM transformation along the salinity gradient and that particulate OM was not more persistent under saline conditions. Our third hypothesis was also rejected, as Sodic Solonchaks contained more than twice as much mineral-bound OC than the Kastanozems, which we ascribe to the flocculation of OM and mineral components under higher ionic strength conditions. Contrary to the fourth hypothesis, the fungi : bacteria ratio in the topsoils remained fairly constant along the salinity gradient. A possible explanation for why our hypotheses were not affirmed is that soil moisture covaried with salinity along the transect, i.e., the Solonchaks were generally wetter than the Kastanozems. This might cause comparable water stress conditions for plants and microorganisms, either due to a low osmotic or a low matric potential and resulting in (i) similar plant growth and hence soil OC inputs along the transect, (ii) a comparable persistence of particulate OM, and (iii) unaffected fungi : bacteria ratios. We conclude that saltaffected soils contribute significantly to the OC storage in the semiarid soils of the Kulunda steppe, while most of the Published by Copernicus Publications on behalf of the European Geosciences Union. 14 N. Bischoff et al.: Organic matter dynamics along a salinity gradient OC is associated with minerals and is therefore effectively s...

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“…On the other hand, results of other authors indicate that root biomass and root length were lower in the drought year than in the wet year (e.g. Hayes, Seastedt, 1987;Andrzejewska, 1991;Titlyanova et al, 1999). Also Hui and Jackson (2006) found strong negative relationships of root fraction with mean annual temperature (MAT) and MAP across sites, however, temporal relationships of root fraction and climatic variables within sites were more complicated and site-specific.…”

Section: Introductionmentioning

confidence: 94%

Proportion of Root Production in Several Temperate Grasslands of Central Europe

Fiala¹,

Tůma²,

Holub³

2014

Ekologia

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Fiala K., Tůma I., Holub P.: Proportion of root production in several temperate grasslands of Central Europe. Ekológia (Bratislava), Vol. 33, No. 3, p. 232-241, 2014. Variability in f RNPP , defined as the fraction of root net primary productivity (RNPP) to total net primary productivity (TNPP) [above-ground net primary productivity (ANPP) + RNPP] were examined through synthesis of 40 samples from available field biomass data assessed by in-growth core and obtained at 13 grassland sites situated in different altitudes in the Czech and Slovak Republics. Results indicate that f RNPP varied from 0.05 to 0.59 across the compared sites. Submontane wet meadows had larger f RNPP and dry lowland grasslands had smaller f RNPP. However, extreme conditions of mountain sites were reflected in a decrease of f RNPP . Thus the relationship between values of f RNPP at different sites and altitudes was indicated by quadratic regression with the highest f RNPP coefficients in middle altitudes, where there were sufficient amounts of precipitation together with not so extremely cold temperatures. Results also indicate a high variability in f RNPP at a regional scale and along increasing altitude. These data show how important and different roles grasslands can play in accumulation and turnover of root biomass.

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Pattern and process in above‐ground and below‐ground components of grassland ecosystems

Cited by 92 publications

References 16 publications

Effect of fertilization on root growth in the wet submontane meadow

Effect of fertilization on root growth in the wet submontane meadow

Organic matter dynamics along a salinity gradient in Siberian steppe soils

Proportion of Root Production in Several Temperate Grasslands of Central Europe

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