Dynamics of soil organic carbon and total nitrogen contents in short-rotation triploid<i>Populus tomentosa</i>plantations

Xuemei, 赵雪梅 Zhao; Xiangyang, 孙向阳 Sun; Xiangyang, 康向阳 Kang; Haiyan, 王海燕 Wang

doi:10.5846/stxb201106160816

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…This phenomenon had been observed during the early cultivation of artificial pine forests 76 . Due to the influences of afforestation species and growth phase, organic carbon and total N content sometimes showed a significant negative correlation 23 . In this study, the analysis revealed that the negative correlation between SOC and TN in Pinus sylvestris var.…”

Section: Discussionmentioning

confidence: 99%

Changes in soil organic carbon and its influencing factors in the growth of Pinus sylvestris var. mongolica plantation in Horqin Sandy Land, Northeast China

Ze-yong

Zhou³

et al. 2019

Sci Rep

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The change of soil organic carbon and its influencing factors after afforestation in sandy land should be taken into account. Here, the factors would be revealed which would influence the SOC dynamics to a depth of 100 cm during the development of Mongolian pine plantations in Horqin sandy land, northeast China. The chronosequence method was used to quantify the change of SOC in vertical distribution and influencing factors following conversion grassland to Pinus sylvestris var. mongolica forest in semi-arid sandy land, northeast China. Then the traditional statistical approaches were used to assessed the influence of the identified factors. Stand age played a major role in SOC dynamics. It took 38 years for SOC in 0–10 cm layer to recover to its initial level after afforestation, and 46 years for 10–20 cm layer. SOC accumulation increased with the age of Mongolian pine plantation. Over-mature forest fully embodied the advantage of SOC accumulation. In addition, the changes of SOC in 0–10 cm layer were also affected by TN, TP, TK and soil moisture, and those below 10 cm soil layers were related to the effects of TN, TP, TK, BD and CS.

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Section: Discussionmentioning

confidence: 99%

Changes in soil organic carbon and its influencing factors in the growth of Pinus sylvestris var. mongolica plantation in Horqin Sandy Land, Northeast China

Ze-yong

Zhou³

et al. 2019

Sci Rep

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“…Therefore it is important to determine the factors influencing litter decomposition, nutrient release and energy cycling in triploid P. tomentoza plantations so that we can employ appropriate management techniques to achieve sustainable soil productivity. Currently, studies on triploid P. tomentoza plantation management have focused on the influence of different planting densities on biomass production [21] , soil nutrient and organic content dynamic [18,22] . A pilot study was previously carried out on nutrient management using the Diagnosis and Recommendation Integrated System (DRIS) [23] , but the report on litter decomposition is insufficient [17] .…”

Section: Introductionmentioning

confidence: 99%

The Influence of Silviculture Treatments on the Leaf Litter Decomposition Rate of Triploid <i>Populus tomentoza</i>

Song

Xie

2014

AMR

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Leaf litter decomposition is a fundamental mechanism for self-fertilization in forest ecosystems. Decomposition rate is an important factor in this process. Understanding how silvicultural treatments affect leaf litter decomposition rate can aid in plantation management. In order to reveal the effects of silvicultural treatments on litter decomposition in triploid Populus tomentoza pulp plantations, a litterbag technique was employed in a range of experimental conditions: with/without tree canopy cover (inter or intra forest belts), intercropping, and embedment in the soil. The results showed treatments had varying affects on leaf litter decomposition. The micro-environment created by the forest belt had no significant impact on leaf litter decomposition. The rate of decomposition of embedded leaf litter was significantly higher than litter on the soil surface, indicating that litter buried by tillage or hoeing would promote faster decomposition. Leaf litter decomposition was also enhanced by mixing with cotton (Gossypium sp.) leaf, showing that intercropping sped up the nutrient cycle in triploid P. tomentoza pulp plantations, thereby maintaining and improving soil productivity.

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Study on Associations between Root and Aboveground Growth of Mixed-Planting Seedlings of Populus tomentosa and Pinus tabuliformis under Soil Nutrient Heterogeneity

Wei,

Yao,

Guo

et al. 2024

Forests

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Near-natural transformation can convert artificial monoculture forests into mixed forests with diverse ages, multi-layered structures, and enhanced ecological functions. This transformation optimizes stand structure, improves soil physical and chemical properties, and enhances stand productivity and species diversity. This study aimed to explore the relationship between the underground roots and aboveground growth of Pinus tabuliformis and Populus tomentosa under conditions of nutrient heterogeneity, with the goal of advancing plantation transformation. This research focused on 1-year-old Populus tomentosa and 5-year-old Pinus tabuliformis, employing two planting densities (25 cm and 50 cm) and three fertilization levels, low (50 g·m−2), medium (100 g·m−2), and high (200 g·m−2), using Stanley Potassium sulfate complex fertilizer (N:P:K = 15:15:15). Each treatment had three replicates, resulting in a total of nine experimental groups, all planted in circular plots with a radius of 1 m. Standard major axis (SMA) regression was used to analyze the allometric relationship between underground fine root biomass and aboveground organ biomass. This study further explored correlations between fine root length, root surface area, volume, biomass, and aboveground biomass, culminating in a mixed-effects model. The mixed-effects model quantified the relationships between underground roots and aboveground growth in varying soil nutrient environments. The results indicated optimal root growth in Populus tomentosa and Pinus tabuliformis, characterized by maximum root length, surface area, and volume, under conditions of 200 g·m−2 soil nutrient concentration and 50 cm planting distance; Populus tomentosa fine roots had a vertical center at a depth of 8.5 cm, whereas Pinus tabuliformis roots were centered at depths of 5–7.5 cm, indicating differing competitive strategies. Pinus tabuliformis exhibited competitive superiority in the soil’s surface layer, in contrast to Populus tomentosa, which thrived in deeper layers. The study of the allometric growth model revealed that under conditions where the nutrient gradient was 200 g·m−2 and the planting distance was 25 cm, Populus tomentosa demonstrated its highest allometric growth index (2.801), indicative of positive allometric growth. Furthermore, there was a notable inclination of resource allocation towards the aboveground, which enhances the accumulation of aboveground biomass. The mixed-effects model equation showed a clear linear relationship between underground roots and aboveground biomass. The final fitting coefficient of the model was high, providing a robust theoretical basis for future management practices. The mixed-effects model revealed the following hierarchy of fixed-effect coefficients for root system characteristics affecting aboveground biomass: fine root volume (132.11) > fine root biomass (6.462) > root surface area (−4.053) > fine root length (0.201). In subsequent plantation reconstruction and forest management, increasing soil fertility and planting distance can promote the growth of underground roots and biomass accumulation. Appropriately increasing soil fertility and reducing planting distance can effectively promote aboveground biomass accumulation, achieving sustainable forest development.

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Dynamics of soil organic carbon and total nitrogen contents in short-rotation triploidPopulus tomentosaplantations

Abstract: 年连续 4 年测定了不同造林密度(2 m伊2 m、2 m伊3 m、2 m伊3. 5 m、2 m伊4 m、2 m伊5 m、 3 m伊3 m、3 m伊4 m) 下 2 年生三倍体毛白杨(B304) 和对照二倍体(1319) 人工林土壤有机碳和全氮含量,以明确不同密度林分

Cited by 4 publications

References 2 publications

Changes in soil organic carbon and its influencing factors in the growth of Pinus sylvestris var. mongolica plantation in Horqin Sandy Land, Northeast China

Changes in soil organic carbon and its influencing factors in the growth of Pinus sylvestris var. mongolica plantation in Horqin Sandy Land, Northeast China

The Influence of Silviculture Treatments on the Leaf Litter Decomposition Rate of Triploid <i>Populus tomentoza</i>

Study on Associations between Root and Aboveground Growth of Mixed-Planting Seedlings of Populus tomentosa and Pinus tabuliformis under Soil Nutrient Heterogeneity

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