Results 101 to 110 of about 24,941 (203)

Potential drivers of fast growth in Paulownia

open access: yesPLANTS, PEOPLE, PLANET, Volume 8, Issue 2, Page 516-529, March 2026.
Trees in the genus Paulownia play a crucial role in sustainable forestry, rural economic development, and carbon mitigation due to their rapid growth, exceptional hardwood properties, and prominent carbon sequestration capacity. This review highlights the societal value of Paulownia trees and synthesizes several potential drivers of extraordinarily ...
Yang Zhao, Marjorie R. Lundgren
wiley   +1 more source

黄土高原典型灌草植物根系生物力学特性及其相互关系

open access: yesShuitu Baochi Xuebao
目的为探究不同灌草植物根系生物力学特性的差异性及其相互关系。方法选取黄土高原地区6种常见的水土保持灌草植物,系统研究其根系形态、化学成分和抗拉力学特性及其相互关系。结果1)6种灌草植物根系直径(D)主要以细根(<2 mm)为主,根长密度(RLD)、根表面积密度(RSAD)和根生物量密度(RMD)不同土层深度分布呈显著差异性(p<0.05);白羊草的D、RLD、RSAD和RMD与其他5种植物存在显著差异性(p<0.05)。2)6种植物根系平均抗拉强度(Tr),白羊草根系平均Tr分别是苔草、
苏雪萌   +4 more
doaj  

Studies on the expression of genes during early root development in sweetpotato (Ipomoea batatas (L.) Lam.) [PDF]

open access: yes, 2006
Thesis (Ph. D. in Bioresource Engineering)--University of Tsukuba, (A), no.
Lalusin Antonio Garcia
core  

Getting hands‐on with hedges—Does experiential engagement in plant science experiments affect secondary school pupils' environmental perceptions?

open access: yesPLANTS, PEOPLE, PLANET, Volume 8, Issue 2, Page 712-726, March 2026.
In towns and cities, vegetation growing around streets and buildings can lessen the risks posed by extreme heat, rainfall and poor air quality. However, the urban public (and particularly, youth) have limited awareness of these environmental benefits.
Chloe Sutcliffe   +3 more
wiley   +1 more source

土壤水分对植物根-土界面相互作用特性的影响

open access: yesShuitu Baochi Xuebao, 2018
为研究不同土壤水分下不同植物根系与土壤界面的摩阻特性,使用直剪仪对内蒙古中西部的5种典型乡土植物(柠条、沙棘、杨柴、紫花苜蓿和沙打旺)的根系在不同土壤含水率下进行根-土界面直剪摩擦试验。结果表明:当土壤含水率在4.5%~24.5%时,5种植物根-土界面摩擦系数均大于素土的土-土界面的值,且随着土壤含水率的增加,根-土界面和土-土界面摩擦系数均呈下降趋势,其中沙棘根-土界面的摩擦系数和黏聚力均大于其他4种植物的值,表明仅从根系与土壤间的相互作用特性来看,沙棘根系固土抗蚀的作用明显优于其他4种植物。根 ...
格日乐   +4 more
doaj  

洱海流域水生态分区 [PDF]

open access: yes, 2012
分区边界的确定是生态分区的重要步骤,但目前多数水生态分区的边界确定以定性分析、专家判断为主。本研究以洱海流域为例,建立了一套两级分区体系。该体系基于GIS技术,用子流域作为分区基本单元,并用相关分析法,定量筛选一、二级分区指标。其中,一级分区指标为高程、坡度和植被归一化指数(NDVI),二级分区指标为农田百分比和城镇百分比。通过指标图层的叠加和重分类,合并同质性子流域,从而将洱海流域划分为5个一级区和9个二级区。藻类群落分布的验证结果表明分区合理。本研究将定量分析和子流域边界应用于水生态分区 ...
唐佳   +6 more
core  

Hybrid Crisis Governance: A Systematic Review of Control‐Based and Collaborative Governance of the COVID‐19 Pandemic

open access: yesRisk, Hazards &Crisis in Public Policy, Volume 17, Issue 1, March 2026.
ABSTRACT Hybrid crisis governance – combining hierarchical control with networked collaboration – has gained increasing attention in the public policy and crisis management literatures. Yet, the concept of hybridity remains crude and underdefined, limiting its analytical utility.
Svante Aasbjerg Thygesen   +2 more
wiley   +1 more source

Multiple pregnancy with complete hydatidiform mole and coexisting normal fetus: systematic review and meta‐analysis of clinical outcomes from non‐randomized studies

open access: yesUltrasound in Obstetrics &Gynecology, Volume 67, Issue 3, Page 272-282, March 2026.
ABSTRACT Objective Complete hydatidiform mole and coexisting normal fetus (CHMCF) is a rare condition for which there is significant heterogeneity in diagnosis, counseling and management of complications. The objective of this study was to summarize the prevalence of clinical outcomes in reported cases of CHMCF.
N. Salmeri   +8 more
wiley   +1 more source

不同生长阶段的香根草-红土复合体混合物法则本构关系建模

open access: yesShuitu Baochi Xuebao
目的构建适用于不同生长阶段的香根草根土复合体本构模型,以精确模拟和预测根土复合体力学行为。方法选取3组不同生长阶段(20、40、60 d)的香根草-红土复合体作为研究对象,通过三轴试验获取力学参数。基于混合物法则,分别采用邓肯-张模型和线弹性模型计算土体和植物根系的本构关系,并按照体积分数进行叠加。结果1)基于混合物法则理论所构建的两相叠加本构模型在模拟根土复合体的力学行为方面表现出色(R²>0.89)。该模型的应力-应变曲线能够准确地反映根土复合体在三轴试验中的抗剪强度及应力 ...
吴锐斌, 及金楠, 李思岑
doaj  

黄土丘陵区4种典型植物根系分布特征及对土壤分离速率的影响

open access: yesShuitu Baochi Xuebao, 2017
以黄土丘陵区4种典型植物种群(狼牙刺、白羊草、铁杆蒿、达乌里胡枝子)为研究对象,采用野外采样、室内模拟试验与分析相结合的方法,对0—30 cm土层的各径级根系密度参数(根长密度、根体积密度、根表面积密度)与土壤理化性质、土壤分离速率间的关系进行了研究。结果表明:(1)4种植物的根系径级主要集中在0<D≤1.0 mm之间,86%~93%的根长和46%~61%的根系表面积分布在此范围内,且根系径级越大,根系各密度参数越小;(2)4种植物各径级根密度参数对土壤理化性质(容重、有机质、团聚体)的影响各不相同 ...
葛芳红   +5 more
doaj  

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