Roots and the Physico‐Chemical Environment

Gregory, Peter J.

doi:10.1002/9780470995563.ch5

Plant Roots 2006

DOI: 10.1002/9780470995563.ch5

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Roots and the Physico‐Chemical Environment

Peter J. Gregory¹

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Cited by 3 publications

References 151 publications

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Consistent proportional increments in responses of belowground net primary productivity to long-term warming and clipping at various soil depths in a tallgrass prairie

Luo

Shi

et al. 2013

Oecologia

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Root distribution patterns in soil are critical to understanding the interactions between climate and vegetation. However, it is not clear how climate change and land use practices affect belowground net primary productivity (BNPP) at various soil depths. In order to explore the effects of warming and clipping on root-distribution patterns along soil profile (0-15, 15-30, and 30-45 cm), we conducted a field experiment from 2005 to 2010 in a tallgrass prairie. We used infrared heaters to elevate soil temperature by approximately 2 °C and annual clipping to mimic hay harvest. Results showed that roots were not evenly distributed through the soil profile. On average across treatments and years, 53 and 83% of the BNPP to 45 cm was distributed in the top 15- and 30-cm soil layers, respectively. Warming- and clipping-induced increases in BNPP were distributed to different soil depths at the proportions similar to those of BNPP. The proportional distribution of BNPP at various soil depths to total BNPP (0-45 cm) was little affected by warming, clipping, and their interactions, resulting in non-significant changes in the distribution of BNPP through the soil profile. These findings suggest that the proportionally vertical distribution of BNPP may remain stable even when the amount of BNPP changes simultaneously in response to climate change and land use practices.

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Consistent proportional increments in responses of belowground net primary productivity to long-term warming and clipping at various soil depths in a tallgrass prairie

Luo

Shi

et al. 2013

Oecologia

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Water Deficit Stress Effects on Corn (<i>Zea mays</i>, L.) Root:Shoot Ratio

Benjamin¹,

Nielsen²,

Vigil³

et al. 2014

OJSS

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A study was conducted at Akron, CO, USA, on a Weld silt loam in 2004 to quantify the effects of water deficit stress on corn (Zea mays, L.) root and shoot biomass. Corn plants were grown under a range of soil bulk density and water conditions caused by previous tillage, crop rotation, and irrigation management. Water deficit stress (Dstress) was quantified by the number of days when the water content in the surface 0.3 m deviated from the water content range determined by the Least Limiting Water Range (LLWR). Root and shoot samples were collected at the V6, V12, and R1 growth stages. There was no significant correlation between Dstress and shoot or root biomass at the V6 growth stage. At the V12 and R1 growth stages, there were negative, linear correlations among Dstress and both root biomass and shoot biomass. The proportional decrease of shoot biomass was greater than the proportional decrease in root biomass, leading to an increase in the root:shoot ratio as water deficit stress increased at all growth stages. Determining restrictive soil conditions using the LLWR may be useful for evaluating improvement or degradation of the soil physical environment caused by soil management.

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Influence of carbon inputs on soil respiration in aPlatycladus orientalisplantation in mountainous Beijing

XiaoWang

NanHailong

ZhuJiangang

et al. 2015

The Forestry Chronicle

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To understand carbon source characteristics of soil respiration, a trench method was used to control carbon inputs (control treatment: CK, no litter treatment: NL, no root treatment: NR, and no litter and no root treatment: NLNR) in a Platycladus orientalis (L.) Franco plantation, so that soil respiration, temperatures and moisture content could be analyzed. Results indicate that different carbon inputs created no significant variance in soil temperatures and moisture content (P>0.05), whereas soil respiration was significantly influenced (P<0.01). During the measurement period, mean soil respiration of CK, NL, NR and NLNR were 3.69, 1.41, 3.11, and 1.99 μmol/m 2 /s, respectively. Soil respiration was reduced by 36.28 ±5.79%, 15.25 ±2.62% and 25.53 ±4.95% in the NL, NR and NLNR treatments, respectively. The proportions of mineral soil, litter and root respirations were 40.95%, 46.91% and 12.14%, respectively. Different carbon inputs caused no significant R 2 variance in the temperature index model or in the temperature-water combined model. These results provide guidelines for investigating Platycladus orientalis ecosystem carbon emissions, as well as carbon input and output balance, and the role of soil respiration in the carbon cycle.

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Roots and the Physico‐Chemical Environment

Cited by 3 publications

References 151 publications

Consistent proportional increments in responses of belowground net primary productivity to long-term warming and clipping at various soil depths in a tallgrass prairie

Consistent proportional increments in responses of belowground net primary productivity to long-term warming and clipping at various soil depths in a tallgrass prairie

Water Deficit Stress Effects on Corn (<i>Zea mays</i>, L.) Root:Shoot Ratio

Influence of carbon inputs on soil respiration in aPlatycladus orientalisplantation in mountainous Beijing

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Roots and the Physico‐Chemical Environment

Cited by 3 publications

References 151 publications

Consistent proportional increments in responses of belowground net primary productivity to long-term warming and clipping at various soil depths in a tallgrass prairie

Consistent proportional increments in responses of belowground net primary productivity to long-term warming and clipping at various soil depths in a tallgrass prairie

Water Deficit Stress Effects on Corn (&lt;i&gt;Zea mays&lt;/i&gt;, L.) Root:Shoot Ratio

Influence of carbon inputs on soil respiration in aPlatycladus orientalisplantation in mountainous Beijing

Contact Info

Product

Resources

About

Water Deficit Stress Effects on Corn (<i>Zea mays</i>, L.) Root:Shoot Ratio