Results 101 to 110 of about 27,177 (219)

Seasonal Changes in Fine Root Biomass in a Chamaecyparis obtusa Endl. Forest [PDF]

open access: yes, 1991
滋賀県大津市の奥比叡に位置する40年生のヒノキ人工林において1989年4月から11月まで土壌コアー法を用いて細根の調査を行った。水洗により選別した根の現存量の65-75%を1mm以下の微細根が占め, 残り25-35%を1-3mmの細根が占めていた。微細根は形態, 物理性をもとに, 生きた微細根と枯死した微細根に区別した。本調査地においてヒノキの微細根, 細根は, 林内において比較的均一に分布しており, さらに垂直分布の検討から細根, 微細根の現存量の95%以上が土壌の20cmまでに分布することが示された。
今吉, 直俊   +2 more
core  

Legacies of consecutive summer droughts on soil‐borne plant parasitic protists (Oomycota: Stramenopila and Phytomyxea: Rhizaria) and protistan consumers (Cercozoa: Rhizaria) along an experimental plant diversity gradient

open access: yesNew Phytologist, Volume 249, Issue 4, Page 2010-2024, February 2026.
Summary Increasing frequencies of severe summer droughts and plant diversity loss disrupt ecosystem functioning and stability of European grasslands. Understanding how these factors interact with pathogens is crucial. We investigated the effects of plant diversity and repeated summer drought on soil‐borne parasites within a grassland biodiversity ...
Marcel Dominik Solbach   +8 more
wiley   +1 more source

Loss of E3 ligase HvST1 function substantially increases distal crossover frequency

open access: yesNew Phytologist, Volume 249, Issue 3, Page 1325-1341, February 2026.
Summary This study characterizes the function of a grass‐specific E3 ubiquitin ligase, HvST1, in regulating synapsis and crossover (CO) formation during meiosis in barley (Hordeum vulgare). In large‐genome cereals, COs are predominantly restricted to distal chromosomal regions, limiting genetic recombination and breeding flexibility.
Jamie Neil Orr   +8 more
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  

A novel mechanism of auxin habituation: upregulation of auxin receptor TRANSPORT INHIBITOR RESPONSE 1 allows cell proliferation independent of external auxin

open access: yesNew Phytologist, Volume 249, Issue 3, Page 1268-1282, February 2026.
Summary Exogenously applied auxins are essential for establishing cell lines in tissue cultures and maintaining their proliferation. Cell lines may develop the ability to proliferate even in media lacking auxin, they may become auxin‐habituated. This study investigated the mechanisms underlying this process.
Pavel Jelínek   +11 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  

Community‐driven variations in snow algae color modulate snow albedo reduction

open access: yesNew Phytologist, Volume 249, Issue 4, Page 1739-1752, February 2026.
Summary Snow algae blooms visibly alter snow color and surface energy balance, yet the biological basis of this variability remains unclear. We investigated how pigment composition and community structure shape the optical properties of snow algae blooms of distinct colors – red, orange, and green – co‐occurring within the same snowfield in Glacier ...
Pablo Almela   +4 more
wiley   +1 more source

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  

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  

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