Results 21 to 30 of about 855 (114)
Effectiveness of protected areas in the Caucasus Mountains in preventing rangeland degradation
Conservation Biology, Volume 39, Issue 3, June 2025.Abstract As land use intensifies globally, it increasingly exerts pressure on protected areas. Despite open, nonforested landscapes comprising up to 40% of protected areas globally, assessments have predominately focused on forests, overlooking the major pressures on rangelands from livestock overgrazing and land conversion.
Arash Ghoddousi +12 more
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Shuitu Baochi Xuebao, 2003 比较研究了南亚热带鼎湖山森林群落演替序列中马尾松林、针阔混交林和季风常绿阔叶林表层(0～20cm)土壤pH值、有机质、全N、速效K、交换性Ca和Mg、有效P、B、Mo、Cu、Fe、Zn和易还原Mn等营养元素的含量及其相关关系,结果表明:马尾松林土壤pH值显著高于其它两森林土壤;随着群落的进展演替,养分在土壤中的累积(Ca除外)呈不断增加的趋势 ...
欧阳学军 黄忠良 周国逸 褚国伟 李炯 史军辉 徐国良
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Gaoya dianqi, 2019 高压断路器是电力系统的核心设备,其稳定可靠运行具有重要意义。高压断路器分合闸电流曲线能够很大程度上反映高压断路器分合闸机构的运行状态,因此文中研究了在几种典型故障条件下,断路器分合闸线圈电流的变化。随机森林算法由于算法实现过程中的两次随机过程,使得算法过拟合风险大大降低,模型泛化能力大大增强。提出了使用随机森林算法识别故障电流曲线,取得了很好的效果。
刘芹 +9 more
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China's Eco‐Civilisation, Climate Leviathan, and Hobbesian Energy Transition
Antipode, Volume 57, Issue 3, Page 830-861, May 2025.Abstract Scholars have hitherto tended to theorise China's ecological civilisation project either as a form of environmental authoritarianism or as a vision of eco‐socialism. This paper contributes to the conversation by conducting a textual analysis of Chinese scholarly discussions on eco‐civilisation.
David Chen
wiley +1 more source
Integrative Conservation, Volume 4, Issue 1, Page 71-84, March 2025.Gaoligong Mountain is home to a large number of rare and endangered species, but the effectiveness of conservation measures in the Gaoligong Mountain Nature Reserve remains uncertain. We predicted the potential distribution areas of 361 rare and endangered wild plants in southern Gaoligong Mountain under current and future climate change scenarios and ...
Yong‐Jing‐Wen Yang +3 more
wiley +1 more source
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
wiley +1 more source
Landscape‐scale predictions of future grassland conversion to cropland or development
Conservation Biology, Volume 39, Issue 1, February 2025.Abstract Grassland conservation planning often focuses on high‐risk landscapes, but many grassland conversion models are not designed to optimize conservation planning because they lack multidimensional risk assessments and are misaligned with ecological and conservation delivery scales.
Kevin W. Barnes +2 more
wiley +1 more source
Dizhen xuebao针对现有的基于实际震害评估的大多研究仅限于某特定区域和某种结构类型，且所采用的数据样本量也十分有限，本文基于随机森林模型，采用2011年3月11日东日本MW9.0地震的37万8 037条建筑物实际震害数据，利用美国应用技术协会发布的地震震害等级划分标准（ATC-13）预测了建筑物地震破坏所引起的损失，对建筑物损失的影响因素进行了特征重要性分析。结果显示：通过合成少数类过采样技术（SMOTE）解决数据不均衡和贝叶斯优化超参数之后，得到了基于随机森林的预测模型测试集的准确率为68.8%，轻微破坏、中等破坏 ...
Zihao Liang +3 more
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Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 6, Page 768-775, December 2024.Abstract Objective Lower urinary tract obstruction (LUTO) is a chronic condition with a spectrum of outcomes. It is usually suspected prenatally based on ultrasound features (USFs). Given the unknown postnatal trajectory and the potential for significant morbidity and mortality, many families choose termination of pregnancy (TOP), often based on USFs ...
J. Richter +10 more
wiley +1 more source
Shuitu Baochi Xuebao, 2023 可溶性碳组分是土壤有机碳库中最活跃的部分,作为土壤碳周转初期变化的敏感指标,其含量受到凋落叶等植物残体输入、森林类型及季节性水热变化的共同调节。采用土壤原位培养法,以亚热带米槠(Castanopsis carlesii)人工林与杉木(Cunninghamia lanceolata)人工林为对象,分析生长季内土壤可溶性碳(DOC)与热水溶性碳(HWSC)含量动态变化及其对凋落叶输入的响应趋势。结果表明,凋落叶输入、森林类型和培养月份均极显著影响土壤可溶性碳组分含量(p＜0.001 ...
张可欣 +5 more
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