Whether the Rock Fragment Content Should Be Considered When Investigating Nitrogen Cycle in Stony Soils?

2019 ◽  
Vol 124 (3) ◽  
pp. 521-536 ◽  
Author(s):  
Kaihua Liao ◽  
Xiaoming Lai ◽  
Zhiwen Zhou ◽  
Xiankui Zeng ◽  
Wenyi Xie ◽  
...  
Keyword(s):  
Nitrogen Cycle ◽  
Rock Fragment ◽  
Rock Fragment Content

scholarly journals Rock Fragment Content in Soils Shift Root Foraging Behavior in Xerophytic Species

2021 ◽  
Author(s):  
Hui Hu ◽  
Weikai Bao ◽  
David M. Eissenstat ◽  
Long Huang ◽  
Fanglan Li
Keyword(s):  
Root Hair ◽  
Fine Root ◽  
Root Hairs ◽  
Root Traits ◽  
Rock Fragment ◽  
Hair Density ◽  
Root Branching ◽  
Root Hair Density ◽  
Branching Intensity ◽  
Rock Fragment Content

Abstract Aims Root traits associated with resource foraging, including fine-root branching intensity, root hair and mycorrhiza, may change in soils with various physical structure indicated by rock fragment content (RFC), while how these traits covariate at the level of individual root branching order is largely unknown.Methods We subjected two xerophytic species, Artemisia vestita (subshrub) and Bauhinia brachycarpa (shrub), to increasing RFC gradients (0%, 25%, 50% and 75%, v v-1) in an arid environment and measured fine-root traits related to resource foraging.Results Root hair density and mycorrhizal colonization of both species decreased with increasing root order, but increased in 3rd- and 4th-order roots at high RFCs (50% or 75%). The two species tend to produce more root hairs than mycorrhizas under the high RFCs. For both species, root hair density and mycorrhizal colonization intensity were negatively correlated with root length and root diameter. Rockiness reduced root branching intensity in both species comparing with rock-free soil. At the same level of RFC, A. vestita had thicker roots and lower branching intensity than B. brachycarpa, and tended to produce more root hairs.Conclusion Our results suggest the high RFC soil conditions stimulated greater foraging functions in higher root orders. We found evidence for a greater investment in root hairs and mycorrhizal symbioses as opposed to building an extensive root system in rocky soils. The subshrub and shrub species took different approaches to foraging in the rocky soil through distinctive trait syndromes of fine-root components.

Pore size distribution and pore functional characteristics of soils as affected by rock fragments in the hilly regions of the Sichuan Basin, China

2020 ◽  
pp. 1-10
Author(s):  
Jiangwen Li ◽  
Zhen Han ◽  
Shouqin Zhong ◽  
Pengfei Gao ◽  
Chaofu Wei
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Sichuan Basin ◽  
Total Porosity ◽  
Rock Fragment ◽  
Functional Characteristics ◽  
Rock Fragments ◽  
Hilly Region ◽  
Rock Fragment Content

Soil pore size distribution and pore functional characteristics are the most important for soil physical properties, water retention, and transmission. Furthermore, considerable amounts of rock fragments are present in hilly region soils. In this study, we discuss the pore size distribution and pore functional characteristics of soils as affected by rock fragments in the hilly regions of Sichuan Basin, China. The soil water characteristic curve was measured to calculate the soil total porosity and the ratio of equivalent pores in each diameter class. The results suggest that the soil total porosity decreases with increasing rock fragments size. The proportion of transmission pores increased gradually with increasing rock fragment content, whereas the fractions of storage pores and residual-bonding pores decrease gradually. Furthermore, the ratio of effective soil porosity to total porosity is higher than that of ineffective porosity to total porosity with increasing rock fragment content. In summary, increasing the rock fragment content can notably increase the proportion of soil transmission pores, thereby increasing soil aeration and water permeability. However, a high rock fragment content is not conducive to maintaining the water needed for normal plant growth.

Hydric properties of some Spanish soils in relation to their rock fragment content: implications for runoff and vegetation

CATENA ◽  
1994 ◽  
Vol 23 (1-2) ◽  
pp. 73-85 ◽  
Author(s):  
F. Ingelmo ◽  
S. Cuadrado ◽  
A. Iban˜ez ◽  
J. Hernandez
Keyword(s):  
Rock Fragment ◽  
Rock Fragment Content

scholarly journals Soil organic carbon stocks are systematically overestimated by misuse of the parameters bulk density and rock fragment content

SOIL ◽  
2017 ◽  
Vol 3 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Christopher Poeplau ◽  
Cora Vos ◽  
Axel Don
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Bulk Density ◽  
Agricultural Soils ◽  
Soil Layer ◽  
Rock Fragment ◽  
Rock Fragments ◽  
Soil Organic Carbon Stocks ◽  
Soc Stocks ◽  
Rock Fragment Content

Abstract. Estimation of soil organic carbon (SOC) stocks requires estimates of the carbon content, bulk density, rock fragment content and depth of a respective soil layer. However, different application of these parameters could introduce a considerable bias. Here, we explain why three out of four frequently applied methods overestimate SOC stocks. In soils rich in rock fragments (> 30 vol. %), SOC stocks could be overestimated by more than 100 %, as revealed by using German Agricultural Soil Inventory data. Due to relatively low rock fragments content, the mean systematic overestimation for German agricultural soils was 2.1–10.1 % for three different commonly used equations. The equation ensemble as re-formulated here might help to unify SOC stock determination and avoid overestimation in future studies.

scholarly journals Spatial variation of global surface soil rock fragment content and its roles on hydrological and ecological patterns

CATENA ◽  
2022 ◽  
Vol 208 ◽  
pp. 105752
Author(s):  
Xiaoming Lai ◽  
Ya Liu ◽  
Liuyang Li ◽  
Qing Zhu ◽  
Kaihua Liao
Keyword(s):  
Spatial Variation ◽  
Surface Soil ◽  
Rock Fragment ◽  
Ecological Patterns ◽  
Global Surface ◽  
Rock Fragment Content

Aggregate stability of cultivated vineyard soils with high rock fragment content in the Mosel area, Germany

2021 ◽  
Author(s):  
Teresa Benzing ◽  
Paula Hauter ◽  
Thomas Iserloh ◽  
Manuel Seeger
Keyword(s):  
Aggregate Stability ◽  
Rock Fragment ◽  
Horizon 2020 ◽  
Percolation Method ◽  
First Results ◽  
Drop Technique ◽  
Aromatic Herbs ◽  
Wet Sieving ◽  
Rock Fragment Content

<p>Within the European project Diverfarming (Horizon 2020, no 728003), which investigates crop diversification and low-input farming across Europe, we study the aggregate stability variability of soils with high rock fragment content on steep sloping vineyards in the upper Saar valley of the Mosel area (Wawern, Rhineland-Palatinate, Germany).</p><p>In the framework of the case study researched by Trier University and their partners, aromatic herbs (Oregano and Thyme) are planted in rows underneath the grapevines to minimize soil erosion, suppress unwanted weeds and to be harvested for further use. Additionally, this cultivation affects different soil characteristics such as aggregate stability.</p><p>We analyse the aggregate stability using and comparing three different methods:</p><ul><li>wet sieving which is executed in two different ways – slaked and rewetted treatment,</li> <li>percolation method and</li> <li>single drop technique.</li> </ul><p>Aim of the study is to understand the effect of soil treatments underneath the grapevines, and to identify the method(s) being able to quantify the differences best.</p><p>Regarding the different methods, first results indicate that the quantified aggregate stabilities of each method are comparable. With this, we could identify differences between uncultivated rows (control areas), and the rows intercropped with aromatic herbs. In the latter ones, the aggregate stability underneath the grapevines is affected positively. Furthermore, there is a clear difference between slaked and rewetted treatment within the wet sieving method, where less stable aggregates are isolated.</p><p>The results indicate that the accomplished management (vine intercropped with Oregano and Thyme) improves the aggregate stability and therefore it improves the soil quality in general.</p>

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