Results 21 to 30 of about 456,157 (161)
Shuitu Baochi Xuebao, 2007 选择毛乌素地区东北部梁地上3种类型的小叶杨人工林,研究了坡位对其生长和土壤养分空间差异的影响。结果表明:整体上,坡位对小叶杨和沙柳的生长均有显著影响。小叶杨人工林植被生长均表现为:坡底>坡顶≥坡中,小叶杨和柠条的混交林比其他两个林型生长好。小叶杨人工林土壤有机质含量在坡底部位多数土层中含量较高,在0.57%~1.09%之间,坡中和坡顶部位含量较小,分别在0.36%~1.07%和0.32%~0.82%之间,这与植被生长较好密切相关;土壤有机质含量在不同坡位均呈波动式减少的趋势,0~10 ...
刘鑫, 满秀玲, 陈立明, 李文影
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Shuitu Baochi Xuebao, 2022 东北黑土坡耕地受土壤侵蚀和习惯顺坡耕作措施的影响,水土流失严重,土壤有机碳含量呈逐年下降趋势。针对东北黑土坡耕地不同垄作措施水土流失及土壤有机碳变化特征不明确的问题,采用田间定位试验的方法,探究了顺坡垄作和横坡垄作对坡耕地水土流失及土壤有机碳变化的影响。结果表明:(1)横坡垄作相对于顺坡垄作能显著减少径流总量97.1%,减少泥沙总量93.1%,表现出较强的拦截地表径流和泥沙的作用。(2)横坡垄作对比顺坡垄作可减少99.9%的SOC及99.3%的DOC流出耕地,坡肩和坡背是拦截迁移土壤有机碳的主要坡位 ...
盖浩 +5 more
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American Anthropologist, Volume 127, Issue 3, Page 517-528, September 2025.ABSTRACT This article examines the contested status of “sign language” in Singapore by exploring deaf people's experiences of the “Mother Tongues”—the state's designation for the official languages of Mandarin, Malay, and Tamil—with a particular focus on the relationships that deaf Chinese Singaporeans have with Mandarin.
Timothy Y. Loh
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Effect of uneven tolerance to human disturbance on dominance interactions of top predators
Conservation Biology, Volume 39, Issue 2, April 2025.Abstract Anthropogenic activities may alter felid assemblage structure, facilitating the persistence of tolerant species (commonly mesopredators), excluding ecologically demanding ones (top predators) and, consequently, changing coexistence rules. We aimed to determine how human activities influence intraguild relationships among top predators and ...
Pablo Villalva +2 more
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Indian Pangolin in Lamjung Requires Urgent Attention 尼泊尔拉姆琼县地区的印度穿山甲急需关注
Wildlife Letters, Volume 2, Issue 4, Page 204-213, December 2024.This study documented the first evidence of the Indian pangolin in Lamjung district, Nepal, finding three burrows and rescue evidence in Simalchaur Naringhat Community Forest. The burrows identified at an elevation of 530 m and characterized by moderate crown and ground cover (26%–50%), a 25° slope, and predominantly red soil, are indicative of a ...
Asmit Neupane +4 more
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Shuitu Baochi Xuebao, 2019 以陕北黄土区吴起县合沟流域浅沟土壤水分为研究对象，通过对研究区不同深度、不同坡向、不同坡位的浅沟土壤水分空间分布特征进行研究。结果表明：（1）根据浅沟与原状坡油松生长量关系，将浅沟划分为深浅沟（40 cm ≤浅沟深度）和浅浅沟（20 cm ≤浅沟深度 上坡位 > 中坡位；深浅沟则为上坡位 > 下坡位 > 中坡位；在浅沟内，阴坡在中、下坡位土壤水分显著高于阳坡，阳坡上坡位土壤水分则高于阴坡；原状坡阴坡土壤水分显著高于阳坡。
艾宁 +4 more
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基于修正岩土体强度参数的简化纽马克位移法地震滑坡危险性快速评估技术
Dizhen xuebao, 2022 地震滑坡危险性评估可为震后应急响应等提供科学的决策依据。纽马克位移法可不依赖同震滑坡编目快速评估同震滑坡危险性。工程岩体物理力学参数是该方法的核心参数之一，但其赋值过于单一，难以反映复杂地质背景下岩体强度的空间差异性。针对上述问题，本文在分析地震滑坡影响因子的基础上，选择距断层距离、高程和距水系距离作为影响岩体强度的评价指标并建立岩体强度评价模型，获得区域岩体强度修正系数，进而修正传统方法的临界加速度。结合震后的即时地震动峰值加速度，采用简化纽马克位移法计算边坡累积位移，开展地震滑坡危险性快速评估 ...
Shuai Chen, Zelang Miao, Lixin Wu
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Conservation Biology, Volume 38, Issue 4, August 2024.Abstract Eradicating invasive predators from islands can result in substantial recovery of seabirds, but the mechanisms that drive population changes remain poorly understood. Meta‐analyses have recently revealed that immigration is surprisingly important to the recovery of philopatric seabirds, but it is not known whether dispersal and philopatry ...
Jeremy P. Bird +2 more
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Shuitu Baochi Xuebao, 2008 在重庆市中梁山岩溶区用示踪法对坡耕地进行耕作试验研究。结果表明:锄头和铁锹耕作引起的土壤位移距离、位移量与坡度呈正相关,而踩锹引起的土壤位移距离、位移量则与含水量具有一定的相关性。在顺坡耕作时铁锹引起的土壤位移距离、位移量与锄头相近,但它们远远大于踩锹;等高耕作时铁锹引起的土壤位移距离、位移量是锄头的1.3~3.8倍左右。铁锹顺坡耕作引起的土壤位移距离、位移量是它等高耕作的2~2.4倍;锄头顺坡耕作引起的土壤位移距离、位移量是它等高的3~8.8倍。引起土壤位移量的大小顺序依次是:锄头顺坡>铁锹顺坡 ...
贾红杰 +7 more
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Understanding consumers to inform market interventions for Singapore's shark fin trade
People and Nature, Volume 6, Issue 2, Page 733-748, April 2024.Abstract Sharks, rays and their cartilaginous relatives (Class Chondrichthyes, herein ‘sharks’) are among the world's most threatened species groups, primarily due to overfishing, which in turn is driven by complex market forces including demand for fins.
Christina Choy +2 more
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