Results 21 to 30 of about 1,349 (152)
Shuitu Baochi Xuebao, 2023 为揭示土壤颗粒组成在垂直和水平方向上的分布规律,采集砒砂岩区典型坡面0—100 cm剖面的土壤,运用经典统计学测定其颗粒组成。结果表明:坡面0—100 cm土壤质地主要为砂壤土(59.21%)和壤砂土(36.40%)。随土层深度增加,砂粒含量增加,粉粒和黏粒含量减少,土壤逐渐呈现粗粒化的趋势;坡面尺度上,表层0—10 cm砂粒为弱变异,其余各层各粒级均为中等程度变异,且随土层深度增加变异性增强,不同粒级的变异系数表现为砂粒＜粉粒＜黏粒。沿坡面等高线方向,样带B粗粒化程度最弱,10 cm土层以下 ...
胡健 +5 more
doaj
Integrative Conservation, Volume 3, Issue 1, Page 76-86, March 2024.Jigme Dorji National Park is the exclusive refuge for the critically endangered Bhutan poppy in Bhutan and worldwide, confined to alpine screes in Tshophu, Tshophu base and Jichudrakey base in Soe gewog, Thimphu. The primary conservation threats to this species stem from harvesting, grazing and trampling by livestock, despite the majority of Bhutan ...
Pema Dendup +3 more
wiley +1 more source
Integrative Conservation, Volume 3, Issue 1, Page 22-35, March 2024.Rubber plantations that are larger in size and remotely located have a higher probability of being linked to forest loss and degradation. The global rubber price can act as a significant driver of both deforestation and degradation. Identifying high‐risk plantations and mitigating associated threats could help curb future forest loss due to rubber ...
H. Manjari Jayathilake +4 more
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Shuitu Baochi Xuebao, 2004 定量分析评价水蚀风蚀交错带土壤侵蚀的坡向差异对于土壤侵蚀防治具有重要意义。通过对黄土高原水蚀风蚀交错带六道沟流域一个典型峁坡不同坡向及坡位土壤剖面中137Cs含量的分析研究,表明研究区内梁峁地形的坡向侵蚀差异明显,各坡向平均侵蚀速率大小依次是北坡>东坡>南坡>西坡,南北坡侵蚀差异与黄土丘陵区其它区域相反,分析认为,这与该区域水蚀、风蚀叠加的特殊侵蚀外营力有关,并根据南北坡侵蚀速率的差值估算出该区域风蚀所占比例至少大于18%;峁坡各坡向不同坡位侵蚀差异明显,坡面下部侵蚀最严重,坡面上部和中部次之 ...
李勉 李占斌 刘普灵 崔灵周 李雅琦
doaj
, 2014 本文主要探討臺灣板岩順向坡變形特性，藉由現場調查、地形分析與物理模型試驗說明板岩不同條件下之重力變形特性，並推估板岩變形過程與潛在崩壞機制。結果顯示，坡趾侵蝕透空與降雨入滲機制為板岩變形之關鍵，其將造成板岩材料強度弱化加速發生變形。此外，板岩變形初始發生於崖頂張力區，坡體將沿著高角度葉理滑移，並於侵蝕弱化帶附近形成剪切破壞或複合型破壞。而變形範圍內具有相當多葉理張開之現象，其將有助於地表水與地下水滲入，促使板岩變形區加速變形至崩壞。This paper focuses on characterizing
Chia-Ming Lo +7 more
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Effects of Different Ecological Restoration Measures on Reconstruction of Slope Vegetation in Southeastern Xizang Autonomous Region [PDF]
, 2023 [Objective] The effects of environmental factors on the plant community of a slope during ecological restoration objective of Pai-Mo Highway in Qinghai-Xizang Plateau were analyzed in order to provide theoretical basis for ecological restoration plan of ...
Huang Mengyue +9 more
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Application of Ground LiDAR for The Investigation of Outcrop Discontinuities and Estimation of Associated Engineering Characteristics [PDF]
, 2014 Reliable and direct information about rock slope materials and discontinuity parameters from field investigation are keys to engineering design, structure maintenance and soil/water conservation. Under the impact of global climate change and the surge in
Cheng-Hung Ko +15 more
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Shuitu Baochi Xuebao, 2022 选取黄土丘陵沟壑区纸坊沟小流域为研究区,利用高精度遥感影像(分辨率0.068 m)和DEM (分辨率0.34 m)数据,结合野外调查,对崩塌、滑塌、滑坡、脱落和陷穴等失稳体进行识别,通过统计学、敏感系数方法,利用识别失稳体数据,分析不同类型失稳体空间分布状况,定量研究不同类型失稳体的影响因子敏感程度,揭示不同类型失稳体的主控因子,进一步阐明流域坡体失稳体的空间分布规律和影响坡体稳定性的主控因子。结果表明:(1)利用高精度遥感影像,获取流域失稳体,主要是以小规模和浅层的脱落、崩塌和滑塌为主 ...
张庚, 王志强, 朱喆
doaj +2 more sources
Shuitu Baochi Xuebao, 2005 运用统计学方法,对黄土高原神木水蚀风蚀交错带退耕坡地土壤水分空间变异性及其影响因子进行研究. 结果表明(1)土壤水分含量在垂直剖面方向表现出随深度增加,土壤水分含量呈增加趋势,在100 cm土层内变异最大,在100 cm以下其变化的梯度基本趋于稳定;(2)土壤水分含量沿坡长方向(即坡顶到坡下)呈波浪状递增趋势,且在各坡位变异程度不一,呈现出变异程度为坡上＞坡中＞坡下的趋势;(3)土壤水分含量沿垂直于坡长方向表现为阴坡＞山脊＞阳坡的明显趋势,其变异程度表现为阳坡＞阴坡的趋势 ...
刘春利 邵明安 张兴昌 李世清
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On the Causes of landslides in Shinkai Village [PDF]
, 2014 This study combines rainfall records, geological surveys, satellite images, and digital terrain model data to explore the possible factors causing landslides in Shinkai.
Chun-Sung Chen +5 more
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