Multifunctional Forestry on the Loess Plateau

Wang, Yanhui; Yu, Pengtao; Wang, Junzhong; Xu, Lihong; Feger, Karl‐Heinz; Xiong, Wei

doi:10.1007/978-3-319-54957-6_6

Cited by 4 publications

(5 citation statements)

References 26 publications

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“…The modeling indicated that if the topography was more suitable and the stand structure was more favorable then soil moisture and fertility conditions would be better. This finding was consistent with the initial empirical assumption [1][2][3][4][5][6][7]47,50], with the results of this study offering a more statistically accurate expression than previously determined. The stand structure had little effect on soil properties, all of which were negatively and directly affected, indicating that it imposed certain restrictions on the retained moisture and nutrients in the soil.…”

Section: Discussionsupporting

confidence: 82%

“…Other scholars have also presented research results on some factors related to the stand structure, soil moisture [4,5], and soil nutrients [6] in the Loess Plateau. However, research on the multi-factor coupling relationships between stand structure and soil moisture and nutrients [7] is relatively lacking. Traditionally, the main functions of water and soil conservation in gully areas of this type are regarded as water resource conservation and erosion reduction [8].…”

Section: Introductionmentioning

confidence: 99%

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Relationship between Soil Characteristics and Stand Structure of Robinia pseudoacacia L. and Pinus tabulaeformis Carr. Mixed Plantations in the Caijiachuan Watershed: An Application of Structural Equation Modeling

Wei

Liang

et al. 2018

Forests

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Abstract:In order to study the multi-factor coupling relationships between typical Robinia pseudoacacia L. and Pinus tabulaeformis Carr. mixed plantations in the Caijiachuan basin of the Loess Plateau of Shanxi Province, West China, 136 sample plots were selected for building a structural equation model (SEM) of three potential variables: terrain, stand structure, and soil characteristics. Additionally, the indicators (also known as observed variables) were studied in this paper, including slope, altitude, diameter at breast height (DBH), tree height (TH), tree crown area, canopy density, stand density, leaf area index (LAI), soil moisture content, soil maximum water holding capacity (WHC), soil organic matter (SOM), total nitrogen (TN), total phosphorus (TP), ammonia-nitrogen (NH 3 -N), nitrate-nitrogen (NO 3 -N), and available phosphorus (AP). The results showed that terrain was the most important factor influencing soil moisture and nutrients, with a total impact coefficient of 1.303 and a direct path coefficient of 0.03, which represented mainly positive impacts; while correspondingly stand structure had a smaller negative impact on soil characteristics, with a total impact coefficient of −0.585 and a direct path coefficient of −0.01. The terrain also had a positive impact on the stand structure, with a total impact coefficient of 0.487 and a direct path coefficient of 0.63, indicating that the topography factors were more suitable for site conditions and both the stand structure and the soil moisture and nutrient conditions were relatively superior. By affecting the stand structure, terrain could restrict some soil, water, and nutrient functions of soil and water conservation. The influence coefficients of the four observed variables of DBH, stand density, soil water content, and organic matter, and potential variable topography reached 0.686, −0.119, 1.117, and 0.732, respectively; and the influence coefficients of soil moisture, organic matter and stand structure were −0.502 and −0.329, respectively. Therefore, besides observing the corresponding latent variables, the observed variables had a considerable indirect influence on other related latent variables. These relationships showed that the measures, such as changing micro-topography and adjusting stand density, should effectively maintain or enhance soil moisture and nutrient content so as to achieve improved soil and water conservation benefits in the ecologically important Loess Area.

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Relationship between Soil Characteristics and Stand Structure of Robinia pseudoacacia L. and Pinus tabulaeformis Carr. Mixed Plantations in the Caijiachuan Watershed: An Application of Structural Equation Modeling

Wei

Liang

et al. 2018

Forests

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“…The modern forestry oriented management for maximizing the total value of all FES to communities (Wang et al, ) requires a FES‐oriented management based on the basic information of stand structure parameters (Chazdon, ) and their relationships to individual services. However, traditional forest inventories focus on overstory timber production, resulting in a shortage of UV data (Timilsina, Cropper, Escobedo, & Lima, ).…”

Section: Discussionmentioning

confidence: 99%

“…However, traditional plantation management, with the sole aim of maximizing timber production, does not consider the balance supply of forest ecosystem services (FESs) for meeting the increasing and diverse service demand by society. Therefore, traditional forest management has being amended to a FES‐oriented approach (Wang et al, ; Wang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Optimizing stand structure for trade‐offs between overstory timber production and understory plant diversity: A case‐study of a larch plantation in northwest China

et al. 2018

Self Cite

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Trade-offs are often required for an optimal and sustainable supply of competing services from forests. A study was conducted in northwest China to explore a practical trade-off approach, for promoting the rehabilitation of service-degraded plantation, focusing on the two main competing services of timber production and understory plant diversity conservation (expressed by understory vegetation species number [UVSN]). To describe the stand structure parameter variation with age and tree density, the logistic growth model and power function were coupled and fit with field data from 82 plots of larch (Larix principis-rupprechetii Mayr) plantation within the estimated age range of 12-33 years. The UVSN variation with canopy density and tree density were also quantified. These models and relations developed can serve as a tool for estimating trade-offs. The results showed that with rising tree density, the single tree timber volume decreased but the stand timber volume increased.The UVSN increased until its maximum, at the canopy density range of 0.6-0.7, and then decreased quickly. A proper tree density corresponding to the optimal canopy density of around 0.7 should be kept for maintaining higher UVSN and adequate timber production. In case of the larch plantation studied, optimal tree densities were found around 2,600, 2,000, 1,600, 1,250, and 1,000 trees/ha for the ages of 15, 20, 25, 30, and 35 years, respectively. Although only two main services were considered, the trade-off approach developed here can be a reference for future studies to guide the rehabilitation and multifunctional management of service-degraded plantation.

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“…Therefore, microcracks, pores, cracks, and joints are frequently and randomly distributed in loess. Vertical joints and cracks are frequently developed in loess, which result in the collapse of the loess under the condition of rainfall or irrigation [3][4][5]. Various construction project applications in the Loess Plateau of China provide many development opportunities.…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Numerical Investigation of the Characteristics and Mechanism of Spacing Cracks in Loess Considering the Size Effect

Wei,

Zhou,

Chen

2023

Sustainability

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Loess is a special soil with high water sensitivity which covers a large area in Northwest China. Cracks are prone to generate in loess under the arid and semiarid climates, which will provide a preferential channel for water and reduce the mechanical properties of soils. It is of great significance to understand the evolution characteristics and mechanisms of the cracks in loess areas. At present, research on cracks in soils mainly concentrates on the characteristics of different cracking patterns. However, spacing cracks are mostly discussed in materials like rock and concrete rather than soils. The cracking characteristics and mechanisms of spacing cracks in loess are still inadequate. In this research, drying tests of loess are carried out with different sizes of specimens. The parameters of spacing cracks and local strain distributions of the loess samples are obtained via PCAS and DIC methods during desiccation, respectively. The cracking modes, spacing cracking laws like insertion, and the saturation of spacing cracks are revealed. Finally, the size effect on the characteristics of spacing cracks is verified with the discrete element software MatDEM.

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Multifunctional Forestry on the Loess Plateau

Cited by 4 publications

References 26 publications

Relationship between Soil Characteristics and Stand Structure of Robinia pseudoacacia L. and Pinus tabulaeformis Carr. Mixed Plantations in the Caijiachuan Watershed: An Application of Structural Equation Modeling

Relationship between Soil Characteristics and Stand Structure of Robinia pseudoacacia L. and Pinus tabulaeformis Carr. Mixed Plantations in the Caijiachuan Watershed: An Application of Structural Equation Modeling

Optimizing stand structure for trade‐offs between overstory timber production and understory plant diversity: A case‐study of a larch plantation in northwest China

An Experimental and Numerical Investigation of the Characteristics and Mechanism of Spacing Cracks in Loess Considering the Size Effect

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