Biomass and Carbon Sequestration by Juglans regia Plantations in the Karst Regions of Southwest China

Zhang, Hao; Wang, Kelin; Zeng, Zhongda; Du, Hu; Zeng, Fuping

doi:10.3390/f8040103

Cited by 15 publications

(11 citation statements)

References 33 publications

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“…Zhang et al (2017) noted increasing RS with increasing age for plantation-grown Juglans regia, but their RS at similar tree age (0.27-0.30) was lower compared with this study. Our above-ground C n concentrations were within the range of temperate angiosperm tree species (Thomas and Martin 2012), higher than reported by Zhang et al (2017) for J. regia (421.6-464.6 g kg -1 ) and by Cardinael et al (2017) for hybrid walnut (J. regia 9 J. nigra) (445.7 and 428.6 g kg -1 ), yet lower than reported by Lamlom and Savidge (2003) for J. nigra (491.7 g kg -1 ). The below-ground C n was within the range of J. regia reported by Zhang et al (2017).…”

Section: Discussioncontrasting

confidence: 73%

Carbon and nitrogen accumulation within four black walnut alley cropping sites across Missouri and Arkansas, USA

et al. 2020

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Agroforestry systems that integrate useful long-lived trees have been recognized for their potential in mitigating the accumulation of atmospheric fossil fuel-derived carbon (C). Black walnut (Juglans nigra) is frequently planted and cultivated in North America for its valuable lumber and edible nuts, and is highly amenable to the integration of understory crops or livestock in agroforestry systems. However, little is known about C content in black walnut trees, including the amounts of C assimilated into lignocellulosic tissues within different tree compartments. Therefore, allometric equations for above-and below-ground compartments of 10-year-old black walnut trees across diverse locations were developed. Ten grafted black walnut trees from each of four sites across the midwestern USA were destructively harvested for above-and below-ground biomass, and dry biomass weight (DW w), C (C w) and nitrogen (N; N w) stocks were quantified. Soils surrounding the harvested trees were sampled and analyzed for soil organic C (SOC) and total N (TN). Total DW w ranged from 27 to 54 kg tree-1 , with woody tissues containing an average of 467 g kg-1 C and 3.5 g kg-1 N. Woody tissues differed in C w and N w across location, and aboveground sections contained more C and less N compared with most root tissues. The slopes of the allometric equations did not differ significantly among locations, while intercepts did, indicating that trees only differed in initial size across locations. SOC and TN did not vary in distance from the trees, likely because the trees were not yet old enough to have impacted the surrounding soils. Our results establish a

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Section: Discussioncontrasting

confidence: 73%

Carbon and nitrogen accumulation within four black walnut alley cropping sites across Missouri and Arkansas, USA

et al. 2020

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“…Hence, research on the functional diversity of soil microbial communities can help in understanding the forest soil quality, preventing soil degradation, and improving the cultivation and management of the plantations [29]. The existing studies about the eucalyptus plantations in Guangxi mostly focus on biological diversity [30,31], ecological benefit evaluation [32], soil degradation and fertility [33], and biomass and productivity [34]; in addition, there are also a few studies on the microbial functional diversity comparing different forest stands [35,36]. However, the trends in the soil microflora structure with the increasing age of eucalyptus plantations have rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

Functional Diversity of the Soil Culturable Microbial Community in Eucalyptus Plantations of Different Ages in Guangxi, South China

Lan

Peng

et al. 2019

Forests

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We selected five different ages of eucalyptus plantation sites to understand the culturable microbial functional diversity and the ecological functions of the soil from the eucalyptus plantations in Guangxi. We investigated the carbon source metabolic activity and diversity features of surface soil microbes using the Biolog EcoPlate method (Biolog Inc., Hayward, CA, USA), along with the microbial functional diversity and physicochemical properties of the soil. The results suggest that the carbon source utilization capacity of the soil microbes at various forest ages manifested as 3-year-old > 5-year-old > 2-year-old > 1-year-old > 8-year-old. The abundance, Shannon–Weiner, Pielou, Simpson, and McIntosh diversity indices of the soil microbes initially increased and then decreased with further increase in forest age, with the highest levels in 3- and 5-year-old forests. As per the heatmap analysis, the 3-year-old forest could metabolize the most carbon source species, while the 1- and 8-year-old forests could metabolize the least. Carbohydrates were the most frequently metabolized carbon source. The principal component analysis (PCA) shows that PC1 and PC2 extracted from the 31 factors have 52.42% and 13.39% of the variable variance, respectively. Carbohydrates contributed most to PCA, followed by amino acids and carboxylic acids, and phenolic acids and amines, the least. Canonical correspondence analysis shows that total carbon, alkali-hydrolyzable nitrogen, total nitrogen, total potassium, and pH negatively correlate with soil microbial functional diversity, whereas total and available phosphorus positively correlate with it. To sum up, the soil microbial community structure of eucalyptus plantations at various ages reflects the soil environmental conditions and nutrient availability, which is of great significance in the efficient management and high-quality operation of their plantations in Guangxi.

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“…In this study, the root biomass, annual root increment biomass and ratio of root/aboveground biomass in the seven forest types were estimated via climate, soil, and stand characteristics, which may be used for improving the calculation accuracy of C sequestration by forest roots. Moreover, to address the rock desert or bare stone conditions in karst regions, serious soil erosion, and vegetation degradation problems, the government has implemented a large-scale Grain for Green Program (GGP) [35,37,38]. As the assessment of C sequestration by GGP is labor-intensive, costly, and time-consuming, our data and models in this study may aid for the estimation of forest biomass in the restoration region.…”

Section: Potential Of Forest Root Biomass On C Sequestration In Southmentioning

confidence: 99%

“…In the past decade, the forest biomass in this region has been influenced by excessive felling and deforestation. Meanwhile, large-scale tree plantation was carried out under the Grain for Green Program (GGP) to restore degraded vegetation and maintain the C balance [37,38]. Although there have been some studies on the relationship between forest biomass and climate variation, topographic factors, soil properties, and stand characteristics in southwestern China [34,39], it is still unclear how forest root biomass varies with environmental factors and stand characteristics across different forest types at a regional scale.…”

Section: Introductionmentioning

confidence: 99%

Multiple Factors Drive Variation of Forest Root Biomass in Southwestern China

Zhang

Wang

Zeng

et al. 2018

Forests

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The roots linking the above-ground organs and soil are key components for estimating net primary productivity and carbon sequestration of forests. The patterns and drivers of root biomass in forest have not been examined well at the regional scale, especially for the widely distributed forest ecosystems in southwestern China. We attempted to determine the spatial patterns of root biomass (RB, Mg/ha), annual increment root biomass (AIRB, Mg/ha/year), ratio of root and above-ground (RRA), and the relative contributions of abiotic and biotic factors that drive the variation of root biomass. Forest biomass and multiple factors (climate, soil, forest types, and stand characteristics) of 318 plots in this region (790,000 km2) were analyzed in this research. The AB (the mean values for forest aboveground biomass per ha, Mg/ha), RB, AIRB, and RRA were 126 Mg/ha, 28 Mg/ha, 0.69 Mg/ha and 0.22, respectively. AB, RB, AIRB, and RRA varied across all the plots and forest types. Both RB and AIRB showed significant spatial patterns of distribution, while RRA did not show any spatial patterns of distribution. Up to 28.4% of variation in total of RB, AIRB, and RRA can be attributed to the climate, soil, and stand characteristics. The explained or contribution rates of climate, soil, and stand characteristics for variation of whole forest root biomass were 6.7%, 16.9%, and 10.9%, respectively. Path analysis in structural equation model (SEM) indicated the direct influence of stand age on RB. AIRB was greater than that of the other factors. Climate, soil and stand characteristics in different forest types could explain 9.7%–96.1%, 15.4%–96.4%, and 36.7%–99.4% of variations in RB, AIRB, and RRA, respectively, which suggests that the multiple factors may be important in explaining the variations in forest root biomass. The results of the analysis of root biomass per ha, annual increment of root biomass per ha, and ratio of root and above-ground in the seven forest types categorized by climate, soil, and stand characteristics may be used for accurately determining C sequestration by the forest root and estimating forest biomass in this region.

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Biomass and Carbon Sequestration by Juglans regia Plantations in the Karst Regions of Southwest China

Cited by 15 publications

References 33 publications

Carbon and nitrogen accumulation within four black walnut alley cropping sites across Missouri and Arkansas, USA

Carbon and nitrogen accumulation within four black walnut alley cropping sites across Missouri and Arkansas, USA

Functional Diversity of the Soil Culturable Microbial Community in Eucalyptus Plantations of Different Ages in Guangxi, South China

Multiple Factors Drive Variation of Forest Root Biomass in Southwestern China

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