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学者姓名：葛宏力
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[目的]探究福建省崩壁碎屑层土壤在不同硫酸钙施用条件下的力学强度及微观特征，为今后崩壁土壤恢复和水土保持治理提供数据支撑。[方法]以福建省典型花岗岩崩岗碎屑层土壤为研究对象，以硫酸钙为改良剂，设置0,5,10,15 g/kg 4个浓度梯度，通过室内重塑土试验，使用直剪试验获得了不同剂量下改良土壤的黏聚力和内摩擦角，采用扫描电子显微镜获得了不同浓度下土壤的表观孔隙率。[结果]添加15 g/kg硫酸钙土壤抗剪强度提升效果最佳，在300 kPa垂直荷载条件下，抗剪强度增加9.04%。随着使用量增加，土壤黏聚力比对照处理依次增加27.24%,53.57%,49.39%。改良后土壤内摩擦角变化均不显著，但随着施用浓度的增加均表现出先降低再增加的趋势，且低于空白对照，依次降低8.73%,17.35%,3.91%。添加硫酸钙通过促进土壤形成大团聚体改变了碎屑层土壤的微观结构，低浓度硫酸钙添加下，土壤颗粒呈现大块片状为主，各颗粒之间相距较远且孔隙度大，添加量为15 g/kg时，土壤形成特殊堆叠书页状为主的结构，随着施用浓度增加，土壤表观孔隙率依次减小了15%,25%,47.5%。[结论]添加硫酸钙可以增加碎屑层土壤的力学强度，对治理崩岗有重要指导意义。
Keyword ：
土壤侵蚀 土壤侵蚀 土壤改良剂 土壤改良剂 崩岗 崩岗 扫描电子显微镜 扫描电子显微镜 直剪试验 直剪试验
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| GB/T 7714 | 李晓非 , 张越 , 吴云博 et al. 添加硫酸钙对崩壁碎屑层土壤抗剪强度的影响 [J]. | 水土保持研究 , 2024 , 31 (06) : 161-167 . |
| MLA | 李晓非 et al. "添加硫酸钙对崩壁碎屑层土壤抗剪强度的影响" . | 水土保持研究 31 . 06 (2024) : 161-167 . |
| APA | 李晓非 , 张越 , 吴云博 , 杨璐 , 林金石 , 蒋芳市 et al. 添加硫酸钙对崩壁碎屑层土壤抗剪强度的影响 . | 水土保持研究 , 2024 , 31 (06) , 161-167 . |
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Soil bacterial communities play a crucial role in the evaluation of soil ecosystem stability. Vegetation restoration is a key determinant of soil bacterial communities in areas affected by soil erosion. However, it remains unclear how the structure and diversity of soil bacterial communities vary with soil depth. In this study, we collected soil samples from 0 to 10 cm, 10 to 20 cm, 20 to 30 cm, and 30 to 40 cm depths in vegetation restoration sites located in typical soil erosion areas in China. We compared and analyzed the differences in bacterial community characteristics among different soil depths, using untreated areas as controls. Compared to the untreated areas, the abundance of soil bacteria in the 0-10 cm, 10-20 cm, and 20-30 cm depths of the vegetation restoration sites increased by 1.63, 1.04, and 1.29 times, respectively. Furthermore, vegetation restoration enhanced soil bacterial diversity at the 0-10 cm, 10-20 cm, and 20-30 cm depths. Soil organic carbon (OC) was the main explanatory factor (53.50%, p = 0.000) for the decrease in soil bacterial diversity with soil depth. Additionally, after vegetation restoration in soil erosion areas, the dominant bacterial community composition shifted from Chloroflexi to Actinobacteria at the 0-10 cm, 10-20 cm, and 20-30 cm depths and to Proteobacteria at the 30-40 cm depth. The differences in soil bacterial communities among different soil depths were primarily driven by soil total nitrogen (TN) content, which explained up to 34.5% of the variation. In conclusion, in the subsequent management of vegetation restoration sites, increasing OC and TN content can enhance soil bacterial diversity, improve bacterial community composition, and ultimately enhance the stability of soil ecosystems.
Keyword ：
bacterial community bacterial community ecological restoration ecological restoration organic carbon organic carbon soil depth soil depth soil erosion soil erosion
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| GB/T 7714 | Wang, Xiaopeng , Zhou, Man , Wang, He et al. Depth-dependent responses of the soil bacterial community under vegetation restoration in soil erosion areas of southern China [J]. | LAND DEGRADATION & DEVELOPMENT , 2024 , 35 (3) : 1142-1154 . |
| MLA | Wang, Xiaopeng et al. "Depth-dependent responses of the soil bacterial community under vegetation restoration in soil erosion areas of southern China" . | LAND DEGRADATION & DEVELOPMENT 35 . 3 (2024) : 1142-1154 . |
| APA | Wang, Xiaopeng , Zhou, Man , Wang, He , Yue, Hui , Zhang, Yue , Jiang, Fangshi et al. Depth-dependent responses of the soil bacterial community under vegetation restoration in soil erosion areas of southern China . | LAND DEGRADATION & DEVELOPMENT , 2024 , 35 (3) , 1142-1154 . |
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Soil cracks thoroughly affect the soil shear strength, which is a critical parameter in the analysis and modeling of slope stability. However, the relationship between soil cracks and shear strength in collapsing gullies remains inadequately studied. In this study, soil collected from collapsing gully areas was used to quantitatively investigate the parameters of soil desiccation cracks and the effects of soil cracks on shear strength. The results showed that the development degree of soil cracks increased gradually with decreasing soil water content. During desiccation, surface crack evolution was dominated by the formation of more cracks when soil water content was higher than 20%, and then experienced crack width extension for at lower soil water content. Three-dimensional crack analysis showed that cracks in the undisturbed soil of the red soil layer were very densely developed, and the cracks rates were all greater than 9%. Soil water content and cracks controlled the shear failure characteristics under triaxial compression, and the characteristics of soil shear failure can be summarized into three categories: composite softened soil, ideal elastoplastic soil, and curve-softened soil. The shear strength (tau c) of undisturbed red soil samples had significant negative correlations with the crack rate (CR), total crack length (CL), crack connectivity (CC), and crack fractal dimension (FD). Linear fitting analysis showed that the effect of cracks on soil shear strength could be described as follows: tau c = 1548.8-22.4 x WR-2.67 x CR-4.65xCC, which is helpful for the numerical simulation analysis of the stability of collapsing gully walls.
Keyword ：
3D crack parameters 3D crack parameters Computed tomography Computed tomography Crack evolution Crack evolution Stress-strain curves Stress-strain curves
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| GB/T 7714 | Zhang, Yue , Huang, Yimin , Wang, Zumei et al. A quantitative study on the characteristics of desiccation cracks and their effect on the shear failure characteristics of granite red soil [J]. | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2024 , 83 (1) . |
| MLA | Zhang, Yue et al. "A quantitative study on the characteristics of desiccation cracks and their effect on the shear failure characteristics of granite red soil" . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 83 . 1 (2024) . |
| APA | Zhang, Yue , Huang, Yimin , Wang, Zumei , Shi, Menglu , Lin, Jinshi , Jiang, Fangshi et al. A quantitative study on the characteristics of desiccation cracks and their effect on the shear failure characteristics of granite red soil . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2024 , 83 (1) . |
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【目的】研究游离氧化铁对崩岗不同土层土壤胀缩特性的影响。【方法】利用无荷膨胀试验、线性收缩试验和计算土壤胶体扩散双电层中滑动层厚度，分析游离氧化铁对崩岗不同土层土壤胀缩特性的影响。【结果】游离氧化铁含量与崩岗土壤无荷膨胀率呈线性递增关系(P<0.01),与土壤线性收缩率呈线性递减关系(P<0.05);在电解质浓度相同的条件下，崩岗土壤滑动层厚度随着游离氧化铁含量的提高而增大；游离氧化铁含量不同的红土层、砂土层的土壤滑动层厚度与无荷膨胀率均呈显著正相关(P<0.05),与线性收缩率呈显著负相关(P<0.05)。【结论】游离氧化铁含量影响土壤滑动层厚度，进而影响土壤的胀缩性能。
Keyword ：
崩岗 崩岗 扩散双电层滑动层 扩散双电层滑动层 无荷膨胀率 无荷膨胀率 游离氧化铁 游离氧化铁 线性收缩率 线性收缩率
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| GB/T 7714 | 卢政铧 , 陈文祥 , 李灿娥 et al. 游离氧化铁对崩岗不同土层土壤胀缩特性的影响 [J]. | 福建农林大学学报(自然科学版) , 2024 , 53 (01) : 106-113 . |
| MLA | 卢政铧 et al. "游离氧化铁对崩岗不同土层土壤胀缩特性的影响" . | 福建农林大学学报(自然科学版) 53 . 01 (2024) : 106-113 . |
| APA | 卢政铧 , 陈文祥 , 李灿娥 , 章智 , 张越 , 蒋芳市 et al. 游离氧化铁对崩岗不同土层土壤胀缩特性的影响 . | 福建农林大学学报(自然科学版) , 2024 , 53 (01) , 106-113 . |
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The collapse of collapsing walls is a key process during the Benggang development in southeast China and is closely related to the soil shear strength. Plant root reinforcement can effectively improve the soil shear strength. However, there are few studies on the effect of roots on the soil shear strength of collapsing walls. To explore the influence of roots on the soil shear strength of collapsing walls, the roots of Neyraudia reynaudiana was selected as the research object. This paper studies the tensile properties of the roots through root tensile tests and performs a direct shear test to study the influence of the roots on the soil shear strength by setting different mass moisture contents (15%~30%) and root weight densities (0 ~ 1.25 g 100 cm(-3)). Root tensile force is positively correlated with root diameter by a power function, while tensile strength is negatively correlated with diameter by a power function. Roots could increase the soil shear strength, and which was mainly reflected in cohesive force. The shear strength and cohesive force increase first then decrease with the increasing root density, while root density has no effect on the internal friction. The shear strength, cohesive force and internal friction of root-soil complex all decreased with increasing moisture content. The WWM (Wu and Waldron model) greatly overestimated the cohesion of herbaceous roots, and a new prediction model of the shear strength of root-soil composites was obtained by revising the WWM model by introducing the moisture content and root density (NSE = 0.94). In conclusion, Neyraudia reynaudiana roots could improve the soil shear strength, whereas the strengthening effect decreased under the condition of high moisture content. The results provide a basis for the selection and allocation of vegetation restoration measures in Benggang erosion in southern China.
Keyword ：
Root-soil complex Root-soil complex Shear strength Shear strength Soil and water conservation Soil and water conservation Tensile strength Tensile strength Vegetation restoration Vegetation restoration
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| GB/T 7714 | Huang, Mengyuan , Sun, Shujun , Feng, Kaijun et al. Effects of Neyraudia reynaudiana roots on the soil shear strength of collapsing wall in Benggang, southeast China [J]. | CATENA , 2022 , 210 . |
| MLA | Huang, Mengyuan et al. "Effects of Neyraudia reynaudiana roots on the soil shear strength of collapsing wall in Benggang, southeast China" . | CATENA 210 (2022) . |
| APA | Huang, Mengyuan , Sun, Shujun , Feng, Kaijun , Lin, Mengqi , Shuai, Fang , Zhang, Yue et al. Effects of Neyraudia reynaudiana roots on the soil shear strength of collapsing wall in Benggang, southeast China . | CATENA , 2022 , 210 . |
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'Benggang' is a local term for a widespread type of severgully erosion with steep collapsing walls in granitic, low, hilly areas of southern China, and its development and expansion are closely related to the shear strength of the collapsing wall. Plant roots play an important role in improving soil shear strength. However, the shear strength of root-soil complexes in different layers of collapsing walls remains obscure. We selected Dicranopteris linearis fern roots and adopted the direct shear method to evaluate the effect of root weight density (RWD) (0-1.25 g 100 cm(-3)) on the shear properties of the lateritic, sandy and detritus layers. The results showed that roots could enhance soil shear strength, and the maximum increase in the lateritic layer was 11.53%, higher than that in the sandy (5.84%) and detritus layers (3.17%). As the root content increased, the cohesion of the sandy and detritus layers increased and then decreased, and their maximum increase in cohesion and the fitting optimal RWD were lower than those of the lateritic layer. The internal friction angle was not affected by roots. When the root content was constant, the shear strength and cohesion of the lateritic layer were significantly higher than those of the sandy and detritus layers, while their internal friction angle was significantly lower than that of the latter two layers. The average increment of soil cohesion calculated by the Wu-Waldron model (WWM) was 10.52 kPa, which was 0.30, 3.75 and 19.38 times the measured average values of the lateritic, sandy and detritus layers, respectively. The correction coefficient k ' was 0.02-1.18, and the k' over bar $$ \overline{k\hbox{'}} $$ in the lateritic layer was the highest (0.82), followed by that in the sandy and detritus layers. By combining the modified WWM with Coulomb's formula, new shear strength equations for root-soil complexes of D. linearis were established. The predicted shear strength compared well with the measured shear strength (R-2 > 0.90, NSE >0.90). Overall, the roots only had a significant reinforcement effect on the lateritic layer, and they could still not change the mechanical properties of the collapsing wall, which were more stable in the upper layers and weaker in the bottom. Therefore, other measures should be taken in the bottom layers to improve the stability of Benggangs. Highlights Effect of D. linearis roots on the shear strength of collapsing walls in Benggang was studied. Roots could improve collapsing-wall soil shear strength, mainly reflected in the cohesion. The roots enhancement effect in lateritic layer was better than that of sandy and detritus layers. New shear strength equations of root-soil complexes were established based on the Wu-Waldron model.
Keyword ：
ecological restoration ecological restoration pteridophyte plant pteridophyte plant root-soil complex root-soil complex soil strength soil strength WWM WWM
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| GB/T 7714 | Zhou, Man , Shuai, Fang , Chen, Libo et al. Impact of Dicranopteris linearis roots on the shear strength of different soil layers in collapsing wall of Benggang [J]. | EUROPEAN JOURNAL OF SOIL SCIENCE , 2022 , 73 (6) . |
| MLA | Zhou, Man et al. "Impact of Dicranopteris linearis roots on the shear strength of different soil layers in collapsing wall of Benggang" . | EUROPEAN JOURNAL OF SOIL SCIENCE 73 . 6 (2022) . |
| APA | Zhou, Man , Shuai, Fang , Chen, Libo , Huang, Mengyuan , Lin, Jinshi , Zhang, Yue et al. Impact of Dicranopteris linearis roots on the shear strength of different soil layers in collapsing wall of Benggang . | EUROPEAN JOURNAL OF SOIL SCIENCE , 2022 , 73 (6) . |
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Accurately calculating detachment capacity is the most fundamental issue when establishing a soil erosion process model. Colluvial deposits of Benggang are typical soil-gravel mixtures, whereas the understanding of the soil detachment of colluvial deposits is limited. This work investigated the effects of the gravel contents on the soil detachment capacity of colluvial deposits and its hydrodynamic mechanism. The colluvial sample was collected in Anxi County, Fujian Province, Southeast China, and a small-sample scouring test was used. The slope steepness ranged from 18% to 84%, unit discharge ranged from 0.56x10(-3) to 2.22x10(-3) m(2) s(-1), and gravel content ranged from 0% to 70%. The results indicated that the gravel content is the primary factor that influences the detachment capacity, followed by the discharge and then the slope. The detachment capacity trend with the gravel content varied over different slopes and discharges. Stream power represents the best hydrodynamic parameter for modelling the detachment capacity of colluvial deposits and can be used to establish a fitting equation for the colluvium together with the mean weight diameter (MWD) (Nash-Sutcliffe efficiency (NSE)=0.96). As the gravel content increased, the soil erodibility parameters increased several folds, in some cases more than 10 folds, mainly because the soil shear strength decreased gradually. Meanwhile, as the gravel content increased, the gravel specific surface area increased, the obstruction of gravel to runoff increased, and the energy needed for runoff to overcome gravel obstruction increased, leading to 2-3 folds higher critical shear stress of runoff for soil-gravel mixtures compared with pure soil. In summary, gravel can influence the detachment capacity by changing the soil properties, and the gravel content also affects the relationship between soil detachment capacity and the hydrodynamic parameters. These findings deepen the understanding of the influence of gravel on soil erosion and provide a basis for establishing a soil erosion process model in colluvial deposits.
Keyword ：
Benggang Benggang Erosion resistance Erosion resistance Gravel content Gravel content Hydraulic erosion Hydraulic erosion Hydrodynamics Hydrodynamics Soil detachment Soil detachment
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| GB/T 7714 | Zhang Li-ting , Shuai Fang , Chen Li et al. Effect of gravel content on the detachment of colluvial deposits in Benggang [J]. | JOURNAL OF MOUNTAIN SCIENCE , 2022 , 19 (11) : 3088-3104 . |
| MLA | Zhang Li-ting et al. "Effect of gravel content on the detachment of colluvial deposits in Benggang" . | JOURNAL OF MOUNTAIN SCIENCE 19 . 11 (2022) : 3088-3104 . |
| APA | Zhang Li-ting , Shuai Fang , Chen Li , Huang Yan-he , Lin Jin-shi , Zhang Yue et al. Effect of gravel content on the detachment of colluvial deposits in Benggang . | JOURNAL OF MOUNTAIN SCIENCE , 2022 , 19 (11) , 3088-3104 . |
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Benggang with steep collapsing walls is one of the worst soil erosion problems in South China. The collapse of walls is the most critical process in Benggang development. This is mainly due to the soil water properties. The soil water characteristic curve (SWCC) is a key indicator for analyzing soil moisture, but the SWCC and its mechanism of influence in collapsing walls remain obscure. A pressure plate meter was used for drying experiments to research the SWCCs of undisturbed soils of five layers (from top to bottom: red soil layer, transition layer I, sand soil layer, transition layer II and detrital layer) of two typical collapsing walls. The van Genuchten (VG) model can be fitted to the SWCCs for different layers (NSE ??? 0.90). With increasing soil depth, the parameters a and ??s first decreased and then increased, the parameters n first increased and then decreased, ??r declined as the soil depth increased. These findings illustrate that soil water holding capacity decreases with increasing soil depth. The bottom of the soil is weak in water retention and water can easily reach saturation, resulting in a decline in soil stability, thus promoting soil collapse and finally inducing upper soil collapse. Furthermore, gravel content and particle morphology are factors that should not be neglected for SWCCs. The results of this study provide a theoretical basis for understanding the process of wall collapse in Benggang landforms in South China.
Keyword ：
Gravity erosion Gravity erosion Soil physics Soil physics Soil water potential Soil water potential Undisturbed soil Undisturbed soil Weathering crust Weathering crust
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| GB/T 7714 | Zhang, Liting , Sun, Shujun , Lin, Mengqi et al. Study on soil-water characteristic curves in the profiles of collapsing walls of typical granite Benggang in southeast China [J]. | PEERJ , 2022 , 10 . |
| MLA | Zhang, Liting et al. "Study on soil-water characteristic curves in the profiles of collapsing walls of typical granite Benggang in southeast China" . | PEERJ 10 (2022) . |
| APA | Zhang, Liting , Sun, Shujun , Lin, Mengqi , Feng, Kaijun , Zhang, Yue , Lin, Jinshi et al. Study on soil-water characteristic curves in the profiles of collapsing walls of typical granite Benggang in southeast China . | PEERJ , 2022 , 10 . |
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【目的】探究干燥温度对土壤水分的蒸发速率及其崩壁土壤干缩裂隙的发育过程的影响，为准确认识崩壁土壤裂隙的形态及其对揭示崩岗的发展过程提供理论依据。【方法】研究选取典型崩岗区崩壁的红土层土壤，模拟干缩裂隙发育过程，通过图像处理技术，定量分析裂隙表面参数，探讨温度对崩壁红土层土壤裂隙发育的影响。【结果】温度降低，土壤水分蒸发速率下降，裂隙面积和裂隙总长度增大，裂隙率提高，同时块区面积降低，块区个数以及裂隙条数、节点数显著增加，整个土体呈现出越发破碎的状态。由于裂隙条数的显著增加，低温状态下（40℃）裂隙的平均长度小于高温条件（80℃）的试样，即低温条件较高温条件土壤裂隙发育数量更多，平均长度更小；土壤裂隙的平均宽度随温度升高呈现增大的趋势；分形维数随着温度的降低呈现增大的趋势。黏粒含量显著影响土壤干缩裂隙发育的温度效应。【结论】在较低温度条件下，崩壁红土层表层土壤水分蒸发时间长，裂隙发育过程更缓慢，但发育程度高，裂隙结构更复杂。
Keyword ：
分形维数 分形维数 定量分析 定量分析 崩岗 崩岗 裂隙率 裂隙率
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| GB/T 7714 | 黄奕铭 , 张越 , 杨茂进 et al. 温度对崩壁红土层土壤干缩裂隙形态影响的定量研究 [J]. | 土壤通报 , 2022 , 53 (04) : 805-814 . |
| MLA | 黄奕铭 et al. "温度对崩壁红土层土壤干缩裂隙形态影响的定量研究" . | 土壤通报 53 . 04 (2022) : 805-814 . |
| APA | 黄奕铭 , 张越 , 杨茂进 , 郑勤敏 , 林金石 , 蒋芳市 et al. 温度对崩壁红土层土壤干缩裂隙形态影响的定量研究 . | 土壤通报 , 2022 , 53 (04) , 805-814 . |
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采用ST-1固化剂对典型崩岗洪积泥沙进行固化，通过击实试验和三轴剪切试验分析ST-1固化剂掺量、养护龄期与固化泥沙抗剪强度的关系.结果表明，固化泥沙的最优含水率为12.83 g·kg~(-1),所对应的最大干密度为1.88 g·cm~(-3);固化泥沙的应力—应变曲线为应变软化型，土样表现出脆性破坏特征；抗剪强度随着围压的增大而增大，围压为200 kPa时抗剪强度最大，达到3 707 kPa;随着养护龄期的延长，黏聚力先增大后保持稳定，第14天黏聚力达到最大值，为381 kPa,内摩擦角整体也呈现增大趋势，最大值可达53°;随着ST-1浓度的增大固化土黏聚力增大，但内摩擦角变化不明显.因此修筑拦砂坝时可适当增加围压，并且养护龄期选择7～14 d,固化剂浓度选择0.03%,以达到较高强度.
Keyword ：
ST-1固化剂 ST-1固化剂 三轴剪切试验 三轴剪切试验 养护龄期 养护龄期 击实试验 击实试验 崩岗洪积泥沙 崩岗洪积泥沙
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| GB/T 7714 | 黎造宇 , 罗泉达 , 朱昱 et al. ST-1固化剂对崩岗洪积固化泥沙抗剪特性的影响 [J]. | 福建农林大学学报(自然科学版) , 2022 , 51 (06) : 843-849 . |
| MLA | 黎造宇 et al. "ST-1固化剂对崩岗洪积固化泥沙抗剪特性的影响" . | 福建农林大学学报(自然科学版) 51 . 06 (2022) : 843-849 . |
| APA | 黎造宇 , 罗泉达 , 朱昱 , 姚友植 , 张越 , 蒋芳市 et al. ST-1固化剂对崩岗洪积固化泥沙抗剪特性的影响 . | 福建农林大学学报(自然科学版) , 2022 , 51 (06) , 843-849 . |
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