Results 41 to 50 of about 25,197 (189)
Shuitu Baochi Xuebao, 2017 为揭示三峡库区紫色土坡耕地草本植物根系对地埂土壤的固结作用的土力学机制，选取库区3种草本地埂植物为研究对象，对3种地埂植物根系的分布特征及抗拉性能研究，并分析3种地埂土壤的抗冲性和抗剪强度。研究结果表明，紫花苜蓿、蓑草、桂牧一号的根系总生物量分别为（79.37±1.26）,（97.99±1.66）,（71.76±1.96） g/m2，紫花苜蓿根系在0—10 cm土层分布最多，蓑草主要根系分布深度集中在10—20 cm，桂牧一号根系分布在0—30 cm土层深度范围内呈现出递增的趋势，在30—40 ...
周 萍 +4 more
doaj
[宮崎演習林]B.本年度おこなつた試験調査 : 天然更新に関する研究 [PDF]
(1)植生調査 (2)伐根調査 (3)モミ球果着生状態調査 (4)根系調査目次ページに「no.10 ...
椎葉, 康喜 +2 more
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土壤呼吸作用时空动态变化及其影响机制研究与展望. [PDF]
, 2009 测定不同陆地生态系统土壤呼吸速率及其时空波动,阐明其影响因子,对于全球碳素平衡预算和全球变化潜在效应估计是最为基本的数据。然而,有关土壤呼吸作用变异性及其影响因素的知识仍存在局限性,一些关键的过程和机制还有待阐明。该文综述了近年来土壤呼吸作用时空动态规律、影响机制和模拟方面的研究进展,指出环境因子和生物因子共同驱动着土壤呼吸作用的时间动态变化;土壤呼吸作用在不同时间尺度上还具有明显的空间异质性,这主要是植被覆盖、根系分布、主要的环境因素和土壤特性空间分布的异质性造成的 ...
周广胜., 韩广轩
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There Is Always a Bigger Fish. Determinants of Power Perceptions in Swiss Biodiversity Policy
Policy Studies Journal, EarlyView.ABSTRACT The Advocacy Coalition Framework (ACF) views power as crucial in policy processes, but the nature of coalition power, its determinants, and how to empirically measure it remain understudied. In this article, we use a mixed method approach and social network analysis to explore power relationships in the biodiversity policy subsystem in ...
Alix d'Agostino +2 more
wiley +1 more source
Response of Avicennia marina rhizosphere to arsenic stress and arsenic accumulation and distribution in plants [PDF]
, 2016 红树林是生长在热带、亚热带河口海湾地区的木本植物群落，具有极高的生态价值和经济价值，但红树林湿地由于其独特的生境特征及强烈的人为干扰，面临着日益严重的重金属污染问题。其中，砷（As）由于具有强烈的致癌作用且影响植物正常新陈代谢，成为近几年红树林污染生态学研究的重要内容。目前，红树林As污染的研究主要集中于As在红树林湿地系统中的空间分布、生态风险评估以及As在沉积物中的赋存状态三个方面，有关As胁迫下红树植物的响应机制及红树植物生长对沉积环境中As迁移转化的影响鲜有报道 ...
范缙
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Governing by Ambiguity: Sociotechnical Imaginaries of Platforms in China
Policy &Internet, Volume 18, Issue 2, June 2026.ABSTRACT Besides clear policy directives, the unresolved and open‐ended elements in policy communication also create discursive politics. This article argues that ambiguity in policy communication reflects the state's exercise of power within a fractured sociocultural landscape.
Fangyu Qing, Ngai Keung Chan
wiley +1 more source
Effects of Simulated Sea Level Rise on Storage and Origins of Sediment Organic Carbon and Decomposition of Fine Roots in Kandelia obovata Mangrove Ecosystem [PDF]
, 2016 本研究以厦门曾营海岸三个不同高程样地的秋茄（Kandeliaobovata，以前学名为Kandeliacandel）红树林为研究对象。在模拟海平面上升80cm红树林（SLR80cm）、模拟海平面上升40cm红树林（SLR40cm）以及对照红树林（SLR0cm，相当于福建九龙江口红树林的滩面高程），探讨海平面上升对秋茄红树林生态系统地下部分有机碳过程的影响。 随海平面高度的增加，秋茄红树林底质有机碳和活性有机碳含量均逐渐增加；随着深度的增加，三块样地的底质有机碳含量、TN含量及C/N呈现逐渐减少的趋势 ...
黄莺莺
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Shaping future forests: how can ecophysiology support climate‐smart forest management?
New Phytologist, Volume 250, Issue 5, Page 2778-2813, June 2026.Summary Climate change, particularly the associated increase in extreme events and disturbances, threatens the numerous environmental, social, and economic benefits that forests provide, both locally and globally. Heat and drought pose significant risks to forest ecosystems; the anticipated future climate is expected to exacerbate this trend ...
Arthur Gessler +18 more
wiley +1 more source
Shuitu Baochi Xuebao, 2017 为探讨草本植物根系对崩岗洪积扇土壤抗剪强度的影响，以巨菌草（Pennisetum sp.）和宽叶雀稗（Paspalum wettsteinii）为研究对象，采用WinRHIZO根系分析系统对根系特征进行定量分析，并采用原位剪切试验测定崩岗洪积扇各土层的抗剪强度。结果表明：（1）根系能够改善土壤的结构及水分状况。（2）2种草本植物根系均主要分布在0—5 cm土层，该层巨菌草根系各参数值是该草种根系均值的3.1~4.39倍，宽叶雀稗的则为2.23~2.57倍；随着土层深度的增加，巨菌草根系参数呈对数函数减小，
李 +6 more
doaj
Da Vinci's mischief: xylem conduits in the stems of woody plants do not furcate
New Phytologist, Volume 250, Issue 5, Page 3001-3013, June 2026.Summary The hydraulic architecture of plants is often modeled as a ‘furcating’ network, in which xylem conduits proliferate in number toward the stem apex, analogous to animal circulatory systems. Yet whether furcation actually occurs within woody stems remains untested, despite major implications for carbon costs and hydraulic efficiency.
Gilberto Alemán‐Sancheschúlz +4 more
wiley +1 more source