Effect of thinning-induced gap size on soil CO2 efflux in a reforested spruce forest in the eastern Tibetan Plateau

Pang, Xiaoyun; Hu, Bin; Bao, Weikai; Vargas, Thiago de Oliveira; Tian, Guangming

doi:10.1016/j.agrformet.2016.01.004

Cited by 40 publications

(16 citation statements)

References 35 publications

(38 reference statements)

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“…Higher soil temperatures have often been observed in harvested treatments (Baena et al, 2013;Tufekcioglu et al, 2005). Thinning opened forest canopy and allowed more solar and thermal radiation to penetrate to ground level (Pang et al, 2016). Thus, increased soil temperatures observed in the topsoil were attributed to canopy openness created by thinning.…”

Section: Response Of Soil Properties To Thinning Intensitymentioning

confidence: 99%

“…Thinning improves resistance to insects and disease (Chase, Kimsey, Shaw, & Coleman, ; Louda & Collinge, ), reduces the risk of wildfire (Schoennagel, Veblen, & Romme, ), relieves soil degradation (especially soil drought), and maintains a healthy forest (Baena et al, ) by opening the canopy and changing microclimatic conditions at ground level (Saunders et al, ). Stand responses following thinning involve modifications in understory vegetation composition (Dodson, Peterson, & Harrod, ), the quantity and quality of organic matter into the soil (Saunders et al, ), and root density (including exudates) and turnover (Pang, Hu, Bao, de Oliveira Vargas, & Tian, ; Tufekcioglu, Guner, & Tilki, ). Changes to biotic and abiotic conditions can alter the soil carbon (C) cycle and associated soil properties in forest (Borrelli, Märker, & Schütt, ; Chatterjee, Vance, Pendall, & Stahl, ; Lemenih, Kassa, Kassie, Abebaw, & Teka, ).…”

Section: Introductionmentioning

confidence: 99%

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Responses of soil organic carbon, soil respiration, and associated soil properties to long‐term thinning in a semiarid spruce plantation in northwestern China

Chen

et al. 2018

Land Degrad Dev

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Silvicultural thinning using whole‐tree harvesting (WTH) has been an important and common forest management practice for Picea crassifolia plantations in the Qilian Mountains of China. However, consequences of this silvicultural practice are still not well known. We examined the influence of three thinning levels on long‐term soil carbon storage, soil respiration (Rs), and soil properties. Our results showed that soil carbon stocks decreased significantly with increasing thinning intensity at a soil depth of 0–70 cm, whereas soil water storage increased, especially in the deep soil layers (30–70 cm). Mean Rs rates during the growing season increased significantly with increasing thinning intensity, and the dynamics of Rs coincided with that of soil temperature. Generally, 65% to 73% of the variation in Rs rates in three thinning levels was explained by the changes in soil temperature. WTH significantly increased soil bulk density at the 0‐ to 30‐cm and soil pH at the 0‐ to 20‐cm depths and significantly decreased soil nitrogen and C:N ratio in the 0‐ to 20‐cm layers. As no significant effect of WTH was detected on fine root biomass, we attributed the elevated soil respiration to accelerated decomposition of organic matter as a result of elevated soil temperature and substrate quality. Our results demonstrate the potential for WTH to relieve water deficits in spruce plantations in semiarid regions but suggest that WTH has a negative impact on carbon sequestration.

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Section: Response Of Soil Properties To Thinning Intensitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Responses of soil organic carbon, soil respiration, and associated soil properties to long‐term thinning in a semiarid spruce plantation in northwestern China

Chen

et al. 2018

Land Degrad Dev

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“…On the other hand, microorganisms can decrease the P availability through the immobilization of inorganic P into organic form, decomposition of P solubilizing organic compounds, and changing rhizophere pH decrease (Spohn and Kuzyakov, 2013). Thinning can affect soil microbial community and biomass through altering microenvironments (mainly soil moisture and temperature increase) and substrate quantity and quality (Pang et al, 2013(Pang et al, , 2016. Mosca et al (2007) and Bolat (2014) reported that soil microbial biomass increased after gaps creation due to the increase of soil organic matter.…”

Section: Introductionmentioning

confidence: 99%

“…The responses of soil respiration, carbon mineralization, nitrogen cycling, and microbial community to gap formation in a forest have been comprehensively studied (Moghaddas and Stephens, 2007;Nilsen and Strand, 2008;Pang et al, 2016). However, the impact of forest thinning on soil P fractions and availability was rarely addressed.…”

Section: Introductionmentioning

confidence: 99%

Responses of soil phosphorus fractions to gap size in a reforested spruce forest

Yang

Pang

et al. 2016

Geoderma

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“…It was reported that high-density, monoculture plantations can damage soil fertility, ecological function, and seedling regeneration [29,30]. The creation of gaps in plantations is an opportunity for the system to change in both species dynamicsand ecological processes.…”

Section: Discussionmentioning

confidence: 99%

Effect of Soil Layer and Plant–Soil Interaction on Soil Microbial Diversity and Function after Canopy Gap Disturbance

Lin

Fei

et al. 2018

Forests

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Gaps by thinning can have different microclimatic environments compared to surrounding areas, depending on the size of the gap. In addition, gaps can play important roles in biological dynamics, nutrient cycling, and seedling regeneration. The impacts of gap size on soil microbial communities and enzyme activities in different soil layers in Chinese pine plantations are not well understood. Here, we created gaps of 45 m2 (small, G1), 100 m2 (medium, G2), and 190 m2 (large, G3) by thinning unhealthy trees in an aged (i.e., 50 years old) monoculture Chinese pine plantation in 2010. Soil samples were collected in 2015. The total, bacterial, Gram-positive (G+), and Gram-negative (G−) phospholipid fatty acid (PLFA) profiles were highest in medium gaps in both the organic and mineral layers. These indicesdecreased sharply as gap size increased to 190 m2, and each of the detected enzyme activities demonstrated the same trend. Under all the gap size managements, abundances of microbial PLFAs and enzyme activities in the organic layers were higher than in the mineral layers. The soil layer was found to have a stronger influence on soil microbial communities than gap size. Redundancy analysis (RDA) based on the three systems with different gap sizes showed that undergrowth coverage, diversity, soil total nitrogen (TN), total organic carbon (TOC), and available phosphorus (AT) significantly affected soil microbial communities. Our findings highlighted that the effect of gap size on soil microenvironment is valuable information for assessing soil fertility. Medium gaps (i.e., 100 m2) have higher microbial PLFAs, enzyme activity, and soil nutrient availability. These medium gaps are considered favorable for soil microbial communities and fertility studied in a Chinese pine plantation managed on the Loess Plateau.

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Effect of thinning-induced gap size on soil CO2 efflux in a reforested spruce forest in the eastern Tibetan Plateau

Cited by 40 publications

References 35 publications

Responses of soil organic carbon, soil respiration, and associated soil properties to long‐term thinning in a semiarid spruce plantation in northwestern China

Responses of soil organic carbon, soil respiration, and associated soil properties to long‐term thinning in a semiarid spruce plantation in northwestern China

Responses of soil phosphorus fractions to gap size in a reforested spruce forest

Effect of Soil Layer and Plant–Soil Interaction on Soil Microbial Diversity and Function after Canopy Gap Disturbance

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