Results 51 to 60 of about 831 (92)
Development characteristics and risk assessment of geological hazards in the mountainous and hilly areas of western Zhengzhou City [PDF]
Objective The mountainous and hilly areas of western Zhengzhou City have a complex geological environment, affected by rainfall and human engineering activities. Geological hazards such as collapses, landslides, and debris flows occur frequently.
LIU Songbo +4 more
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Shuitu Baochi Xuebao, 2007 对黄土丘陵区土壤有机碳在不同粒级团聚体中的分布特征及其对植被恢复的响应进行了研究。结果表明:(1)黄土丘陵区不同植被覆盖条件下,土壤有机碳的分布具有一定的表聚性,0~20 cm土层中有机碳的含量均高于20~40 cm中有机碳的含量,不同植被群落下有机碳的含量大小为:大针茅群落>长芒草群落>铁杆蒿群落>百里香群落;(2)同一深度土壤各粒级团聚体中有机碳的分布特征是:0.5~0.25 mm与1~0.5 mm两个粒级中有机碳的含量最高,>1 mm的团聚体中有机碳的含量有随粒级增大而减小的趋势;(3 ...
安韶山, 张玄, 张扬, 郑粉莉
doaj +2 more sources
Shuitu Baochi Xuebao, 2020 人工灌草复合植被是黄土高原植被恢复与重建的主要植被类型，在该区域水土保持中发挥着重要的作用。以定西市安定区为例，基于InVEST模型对该区人工灌草生态系统的水土保持功能进行定量化评估，以期为黄土高原丘陵区生态恢复与水土资源的可持续利用提供决策支撑。评估结果为：（1）人工灌草地单位面积的水源涵养量为369.25 m3/hm2，是草地的90.5%、林地的134%和耕地的110%；该区的水源涵养总量为3 970.99×104 m3，人工灌草地水源涵养量占该区总水源涵养量的29.9%。（2 ...
刘宥延, 刘兴元, 张博, 李妙莹
doaj
Effects of different land use types on soil structure and hydraulic characteristics of reclaimed coal mines in semi-arid areas [PDF]
In order to explore the water characteristics of soil in reclaimed coal mines in semi-arid areas and make better use of the land in reclaimed mining areas, the basic physical properties, water characteristic curves, unsaturated water conductivity and ...
Duomei LI +5 more
core +1 more source
湘中低山丘陵区坡面产流输沙对降雨、土壤类型及水保措施的综合响应特征
Shuitu Baochi Xuebao, 2019 针对湘中低山丘陵区地形地貌条件多样、水土流失影响机制复杂的问题，选取湖南省中部井头（黄壤）、秋波（紫色土）以及莲荷（红壤）3个径流场不同水土保持措施径流小区，综合探究湘中丘陵区不同土壤类型、水土保持措施以及侵蚀性雨型等因子对坡面产流输沙规律的影响特征。结果表明：在年降水量相近的条件下，年径流深和年侵蚀量均为红壤 > 紫色土 > 黄壤；各水保措施小区的减流效益较差，但其减沙效益较好，以黄壤草地措施、紫色土水保林以及红壤经果林和草地措施减沙效益较为明显，年侵蚀减沙率分别达87.89%，55.88%，37 ...
彭浩 +6 more
doaj
The Terraced Walls Significantly Influence the Spatial Distribution of Soil Water in Terraced Areas on the Loess Plateau [PDF]
[Objective] Converting slopes into terraces is a crucial soil and water conservation and agricultural measure on the Loess Plateau. Understanding the impact of terraced walls on soil water is conducive to preserving soil water and enhancing terrace ...
BAI Chenyun +5 more
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Shuitu Baochi Xuebao, 2002 通过野外调查和室内资料分析表明,黄土丘陵沟壑区土壤可划分为扰动人为新成土、干润冲积新成土、黄土正常新成土和红色正常新成土4个土类;有机质缺乏,养分含量低,阳离子代换量小,淋溶作用弱,碳酸钙含量高,剖面发育差,土壤质地粗是试区土壤的共同特征.提出了合理开发利用和培肥改良土壤的方法与途径.
刘京 常庆瑞 寇宝平 张鹏飞
doaj
Shuitu Baochi Xuebao, 2005 通过定位观测和实地调查,对陕北黄土丘陵区已建乡村聚落的水力侵蚀、新建窑洞(房)过程中的弃土侵蚀及窑洞坍塌形成的侵蚀进行了研究,结果表明:①观测期间(2004.6~2004.10),乡村聚落的平均水力侵蚀强度为5434.3 t/km2,已达到强度级侵蚀,其中户间道路为7 348.0 t/km2,户间空地为6 873.2 t/km2,院落为2 081.7 t/km2;②新建1孔(间)窑洞或平房,平均弃土34.9 m3,相当于动土量的23.6%;延安以北丘陵区近20年新建窑(房)平均每年弃土7 957 ...
甘枝茂 岳大鹏 查小春 甘锐
doaj +2 more sources
Shuitu Baochi Xuebao, 2021 为探讨植被类型及生长季阶段对土壤碳氮磷生态化学计量特征的影响，揭示黄土丘陵区陆地生态系统养分限制及循环规律。以黄土丘陵区典型荒草地（Grassland）、苜蓿（Medicago Sativa）地、沙棘（Hippophae rhamnoides）灌木地、文冠果（Xanthoceras sorbifolium）林地、云杉（Picea asperata）林地为研究对象，分析其0—60 cm土壤有机碳（SOC）、全氮（TN）、全磷（TP）含量及化学计量比特征在植被类型间及生长季阶段内的差异。结果表明：（1 ...
刘帅楠 +5 more
doaj
Effect of Southeast Coastal Upwelling in Haitan Island of Northwestern Taiwan Strait on Surface Sedimentary Diatom [PDF]
, 2012 [目的]探讨台湾海峡西北部海坛岛东南沿岸上升流对表层沉积硅藻的影响。[方法]以台湾海峡西北部海坛岛东南沿岸的表层沉积硅藻为材料,对其进行筛选、制片、观察,研究其属种分布特征和上升流对其的影响。[结果]按照表层沉积硅藻的丰度分布特征,将其分为三个研究区,以柱状小环藻、具槽直链藻和波状辐裥藻为主要的优势种群。结合温度、盐度的资料,可以得出海坛岛东南沿岸海域存在上升流。[结论]该研究为进一步探讨海坛岛东南沿岸海域表层沉积硅藻与上升流的关系提供了科学依据。[Objective] To discuss the ...
吴翔恩, 李超, 范彦斌
core