Results 31 to 40 of about 1,380,922 (181)
不同土地利用方式对三江平原湿地土壤酶分布特征及相关肥力因子的影响
Shuitu Baochi Xuebao, 2007 以中国科学院三江平原湿地生态试验站为对象,研究了不同利用方式(湿地草甸、旱田系统、退耕成草、退耕成林)对土壤酶分布特征及相关肥力因子的影响.结果表明:土壤利用方式不同,土壤酶活性(转化酶、脲酶、磷酸酶和过氧化氢酶)、有机碳含量和土壤养分含量有较大差异.未开垦的湿地草甸,土壤酶活性、有机碳和土壤养分含量均为最高,开垦20年后,上述各种指标含量均有较大幅度降低;由耕地恢复为湿地后,土壤酶活性、有机碳和土壤养分含量有较大幅度的回升,而耕地恢复为林地后,上述各种成分也有不同程度地增加.因此 ...
王树起 +4 more
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Shuitu Baochi Xuebao, 2022 为探究黄土高原不同区域典型植被生长对土壤表面电化学性质的影响,以黄土高原自南向北的3个典型区域(永寿墚、坊塌、六道沟)及2种典型乡土草本植物(铁杆蒿(Artemisia gmelinii Web.)、长芒草(Stipa bungeanaTrin.))为研究对象,以退耕1年的撂荒地作为对照,通过土壤样品采集和土壤表面电化学性质的测定,研究典型植被群落对土壤表面电化学性质的影响及其空间差异。结果表明:(1)在黄土高原地区,相较于撂荒地,典型植被群落生长使土壤黏粒、粉粒、有机质含量增加,土壤pH、容重 ...
影响及其空间差异杨亚楠 +4 more
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Effects of Grass Cover on the Overland Soil Erosion Mechanism Under Simulated Rainfall
Water Resources Research, Volume 61, Issue 2, February 2025.Abstract Existing research on soil erosion primarily focuses on the individual effects of factors such as rainfall intensity, slope gradient, grass cover, and soil characteristics, with limited exploration of the interactions among these factors. This study investigated the mechanisms of soil erosion on overland covered with vegetation in the Loess ...
Mingwang Zhang +4 more
wiley +1 more source
Shuitu Baochi Xuebao, 2005 土壤侵蚀预测预报的目的是为治理水土流失、合理利用土地资源而服务的,所以说土壤侵蚀的预测预报单元应落实到一个具体的土地利用生态地形面上。以黄土高原风蚀水蚀交错带的六道沟为研究区,基于土壤侵蚀的发生学原理,首先将各主要发生因子的图件数字化,并通过GPS对数字化图进行校正;然后,对地形条件、物质组成、土壤相三图件进行制图综合,生成流域侵蚀地块图;在此基础上,迭置土地利用类型图,在GIS平台上,生成土壤侵蚀预测最小单元图——生态地形面图。在每类生态单元内,系统分析土壤侵蚀发生的各环境要素,并确定其权重 ...
张丽萍 张登荣 张锐波 杨勤科
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Functional Ecology, Volume 39, Issue 2, Page 621-634, February 2025.Read the free Plain Language Summary for this article on the Journal blog. Abstract Tropical forests are generally characterized by high species diversity and low soil phosphorus (P) availability. Although tropical plants have evolved adaptations to low soil P availability, we know relatively little about the strategies of different groups of species ...
Yingxu Fan +11 more
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Functional Ecology, Volume 39, Issue 2, Page 635-652, February 2025.Read the free Plain Language Summary for this article on the Journal blog. Abstract Invasive plants are a major cause of the global biodiversity crisis; it is therefore crucial to understand mechanisms that contribute to their success. South‐western Australia is a global biodiversity hotspot with extremely low soil phosphorus (P) concentrations.
Dan Tang +7 more
wiley +1 more source
Shuitu Baochi Xuebao, 2019 高原鼢鼠是青藏高原的优势地下啮齿动物，掘洞造丘是其独特的行为之一。高原鼢鼠新生土丘属于次生裸地容易导致水土流失，研究高原鼢鼠新生土丘水土流失对于合理评价其对生态系统的影响具有重要意义。利用径流小区法和风蚀桥法，测定不同地形（平地和坡地）、不同直径大小（大土丘：直径>75 cm，中等土丘：直径50~75 cm，小土丘 ...
马素洁 +8 more
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, 2012 以黄土高原水平方向的4种主要草地类型为研究对象,分析了不同草地类型土壤有机碳(SOC)的分布特征及其影响因素。结果表明:土壤有机碳含量随土壤深度的增加而降低,其中0～20 cm土壤有机碳含量与20～40、40～60、60～80、80～100 cm有机碳含量差异显著。4种草地类型土壤有机碳含量分布规律:0～40 cm为高山草甸草原>典型草原>森林草原>荒漠草原,40～100 cm为高山草甸草原>森林草原>典型草原>荒漠草原 ...
程积民 +4 more
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Ecology and Evolution, Volume 14, Issue 12, December 2024.Greenhouse gas (GHG) emissions from soils play a significant role in contributing to global warming. Vegetation types especially affect soil GHG production. Our findings suggest that the restoration of natural grassland and artificial N‐fixing shrubland like Caragana korshinskii should be encouraged to alleviate GHG emissions, with the practical ...
Jihai Zhou +7 more
wiley +1 more source
工程施工技术变电站接地网性能受土壤条件影响较大，在复杂的土壤环境中施工和检测属于电力工程的技术难题。研究发现复杂土壤条件下接地网性能受土壤电阻率分布、土层结构不同、材料腐蚀等影响。从施工工艺、检测技术、质量控制三个方面对复杂土壤条件下采取的关键措施进行了系统的整理。施工上给出分层土壤接地体敷设方案和材料匹配原则，在检测上给出接地电阻测量、接触电压检测、腐蚀诊断的适用方法。根据非均匀土壤模型进行接地参数优化设计，采用施工过程精细化控制和在线监测的方法，是提高接地网工程安全性的一种途径。
红霖 胡, 云龙 李
semanticscholar +1 more source