Response of understory plant species richness and tree regeneration to thinning in Pinus tabuliformis plantations in northern China

Yang, Haijiao; Pan, Chao; Wu, You Fu; Qing, Shiqi; Wang, Zhibin; Dihai, Wang

doi:10.1016/j.fecs.2023.100105

Cited by 5 publications

(2 citation statements)

References 44 publications

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“…These four indicators were higher in the T2 and T3 treatments than CK in the 0-20 cm layer but lower in the 20-40 cm layer (Table 2). The results comply with the rule of soil nutrients content in different layers that aggregate on the soil surface in subtropical plantations [50,51] and may be related to spatial variation of litter input and organism nutrients demand: (1) the understory vegetation root system may not develop entirely in these stands, and litter is mainly concentrated on the soil surface [52]; (2) meanwhile, Eucalyptus trees usually uptake nutrients from the depth of the soil layer, and microorganisms indicate higher N demand in soil below 20 cm in subtropical forests [50]. Therefore, the amount of soil nutrients consumed is higher in the 20-40 cm layer compared to the 0-20 cm layer.…”

Section: Soil Nutrients Of Different Intensity Thinned E Grandis × E ...supporting

confidence: 82%

Thinning Promotes Soil Phosphorus Bioavailability in Short-Rotation and High-Density Eucalyptus grandis × E. urophylla Coppice Plantation in Guangxi, Southern China

Xiao,

Ali,

et al. 2023

Forests

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Thinning can improve soil nutrient supply, but the effects of thinning on soil phosphorus (P) contents and bioavailable mechanisms in high-density and short-rotation Eucalyptus coppice forests are not well reported. Therefore, we conducted five intensities of thinning treatments, which were 83% (283 tree ha−1, T1), 66% (566 tree ha−1, T2), 50% (833 tree ha−1, T3), 33% (1116 tree ha−1, T4), and 0% (1665 tree ha−1) in a 2nd 6-year-old E. grandis × E. urophylla coppice plantation with 8 years as a rotation, investigated soil nutrient contents, microbial biomass, and extracellular enzyme activities of 0–20 and 20–40 cm soil layers after two years of thinning, and analyzed the relationship between available phosphorus (AP) and other indicators. The results showed that soil total phosphorus (TP) contents in 2nd Eucalyptus coppice plantations were lower than in native forest ecosystems, but T1 significantly increased (p < 0.05) TP by 81.42% compared to CK of 0–20 cm, whereas T2 and T3 improved available phosphorus (AP) by 86.87%–212.86% compared to CK. However, soil organic carbon (SOC), dissolved organic carbon (DOC), total nitrogen (TN), and alkaline hydrolysable nitrogen (AN) were not significantly different (p < 0.05) among all treatments. According to the analysis, soil TP contents were significantly positively related (p < 0.001) to SOC; soil total nutrients and DOC contents had the highest standardized total effect on AP; meanwhile, the quotient of microbial biomass directly conducted soil AP contents. These results highlighted that thinning can be used to alleviate soil P shortages by promoting multinutrient and biological cycles in Eucalyptus coppice forests.

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Section: Soil Nutrients Of Different Intensity Thinned E Grandis × E ...supporting

confidence: 82%

Thinning Promotes Soil Phosphorus Bioavailability in Short-Rotation and High-Density Eucalyptus grandis × E. urophylla Coppice Plantation in Guangxi, Southern China

Xiao,

Ali,

et al. 2023

Forests

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“…When studying understory regeneration, many scholars have explored and analyzed the relationship between stand factors and sapling regeneration. Hai jiao Yang et al [51] found that moderate thinning, which controls stand density, can adjust the diversity of understory plants. Feng Liu et al [9] used a nonlinear mixed model to analyze the impact of different sizes of forest gaps on the biomass accumulation of understory saplings.…”

Section: Model Variable Selectionmentioning

confidence: 99%

Study on the Regeneration Probability of Understory Coniferous Saplings in the Liangshui Nature Reserve Based on Four Modeling Techniques

Zhao,

Sun,

Jia

et al. 2023

Remote Sensing

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Forests are one of the most important natural resources for humans, and understanding the regeneration probability of undergrowth in forests is very important for future forest spatial structure and forest management. In addition, the regeneration of understory saplings is a key process in the restoration of forest ecosystems. By studying the probability of sapling regeneration in forests, we can understand the impact of different stand factors and environmental factors on sapling regeneration. This could help provide a scientific basis for the restoration and protection of forest ecosystems. The Liangshui Nature Reserve of Yichun City, Heilongjiang Province, is a coniferous and broadleaved mixed forest. In this study, we assess the regeneration probability of coniferous saplings (CRP) in natural forests in 665 temporary plots in the Liangshui Nature Reserve. Using Sentinel-1 and Sentinel-2 images provided by the European Space Agency, as well as digital elevation model (DEM) data, we calculated the vegetation index, microwave vegetation index (RVI S1), VV, VH, texture features, slope, and DEM and combined them with field survey data to construct a logistic regression (LR) model, geographically weighted logistic regression (GWLR) model, random forest (RF) model, and multilayer perceptron (MLP) model to predict and analyze the CRP value of each pixel in the study area. The accuracy of the models was evaluated with the average values of the area under the ROC curve (AUC), kappa coefficient (KAPPA), root mean square error (RMSE), and mean absolute error (MAE) verified by five-fold cross-validation. The results showed that the RF model had the highest accuracy. The variable factor with the greatest impact on CRP was the DEM. The construction of the GWLR model considered more spatial factors and had a lower residual Moran index value. The four models had higher CRP prediction results in the low-latitude and low-longitude regions of the study area, and in the high-latitude and high-longitude regions of the study area, most pixels had a CRP value of 0 (i.e., no coniferous sapling regeneration occurred).

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Scale effect of landscape characteristics on undergrowth vegetation variance with different ecological traits

Li,

Wang,

Zhu

et al. 2024

Ecological Frontiers

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Response of understory plant species richness and tree regeneration to thinning in Pinus tabuliformis plantations in northern China

Cited by 5 publications

References 44 publications

Thinning Promotes Soil Phosphorus Bioavailability in Short-Rotation and High-Density Eucalyptus grandis × E. urophylla Coppice Plantation in Guangxi, Southern China

Thinning Promotes Soil Phosphorus Bioavailability in Short-Rotation and High-Density Eucalyptus grandis × E. urophylla Coppice Plantation in Guangxi, Southern China

Study on the Regeneration Probability of Understory Coniferous Saplings in the Liangshui Nature Reserve Based on Four Modeling Techniques

Scale effect of landscape characteristics on undergrowth vegetation variance with different ecological traits

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