Results 11 to 20 of about 910,922 (183)
International Journal of Applied Linguistics, EarlyView.ABSTRACT This study examines how foreign language teachers’ beliefs about the medium of instruction and translanguaging evolve over time by revisiting three in‐service teachers twelve years after their initial interviews. Using a qualitative longitudinal design, the study traces how translanguaging was initially framed as pedagogically deficient but ...
Danping Wang
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Shuitu Baochi Xuebao, 2002 根系结构不同 ,其固持土体的能力存在很大差异。利用分形理论对不同根系结构稳定土体的能力进行了量化比较 ,结果表明 :(1)长江上游暗针叶林生态系统中主要树种根系都表现出了较为明显的分形结构特征 ,高山柳(Salix sp.)的根系结构最复杂 ,具有多层次细微分枝结构 ,分形维数最大 ,达 1.73 5 6 75 ,冬瓜杨 (Populuspurdomii)次之 ,为 1.6 0 16 6 ,峨眉冷杉 (Abiesf abri)分枝结构简单 ,以侧行主根为主 ,分形维数仅为 1.4 4 93 8 ...
谢春华 罗辑 等
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Shuitu Baochi Xuebao, 2007 研究了石灰岩山区的黄栌、连翘、绣线菊和黄荆4种灌木林地根系分布特征及其固持土壤效应。结果表明：4种灌木林地根系的分布特征存在极显著差异,黄栌林地根系的生物量和长度均最大,各径级根系中直径〈1 mm的根系生物量最大;连翘林地根系的生物量和长度均较小,各径级根系中直径≥5 mm的根系生物量最大;黄荆林地根系的生物量和长度较高,主要分布在0～20 cm土壤层;绣线菊林地根系生物量最小,主要分布在0～20 cm土壤层。4种灌木林地土壤的抗侵蚀性能明显高于荒坡地,且与0～20 cm层根系生物量和根系长度显著相关 ...
杨吉华 +4 more
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New Phytologist, EarlyView.Phylogenetic distance of host does not explain phenotypic differences of Meloidogyne incognita parasitism at 25 dpi. Summary The plant–parasitic nematode Meloidogyne incognita is the pathogen with the broadest host range among all known biotrophic interactions.
Victor Hugo Moura de Souza +11 more
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Shuitu Baochi Xuebao, 2018 为研究灌木植物根系的固土护坡力学效应，探讨根系与土体间相互作用的特性。以多花木蓝为供试植物，进行植物根系切片并计算根系的表面凹凸度，选取0~0.5，0.5~1.0，1.0~1.5,1.5~2.0 mm 4种粒径的粉质黏土，在不同的土体含水率和根径条件下，制备根土复合体扰动试样，进行单根抗拔摩阻试验和直剪摩阻试验，探讨土体含水率、植物根径以及土体粒径对根土界面摩阻特性的影响。结果表明：多花木蓝根系的表面凹凸度随根径变化无显著性差异，根系的拉拔剪应力集中在17.36~32.76 kPa ...
夏振尧, 刘, 饶云康
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New Phytologist, EarlyView.Conceptual scheme of the nitrous oxide (N2O) production, consumption, and transport processes across the soil–plant–atmosphere continuum. Summary Nitrous oxide (N2O) contributes substantially to climate change and stratospheric ozone degradation, yet large uncertainties in its global budget point to overlooked sources.
Moritz Schroll +4 more
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Shuitu Baochi Xuebao, 2007 条桑在河北省东部平原沙地和丘陵梯田广泛种植,与农作物间作是其主要栽培模式。2006年在河北省迁安市进行了桑粮间作田条桑根系断面积、根量、根系直径分布特征及其对土壤水分、养分影响的研究。结果表明：根系分布主要集中在20～40 cm土层内,此范围内的根系重量占总根量的60%～80%。根系以直径小于3 mm的细根居多,占总根量的30%～40%,大于7 mm的粗根数量很少,占总根数的5%～15%。平原沙地条桑根系主要分布在距桑丛中心100 cm范围内,桑丛外缘100 cm处的根量仅为总根量的6.52 ...
张俊娥 +5 more
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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
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Shuitu Baochi Xuebao目的为探究草本植物在各生育阶段的根系形态特征、力学特性及二者间的关系。方法对在紫色土坡地生长60、90、120、150 d的狗尾草（须根系）和紫花苜蓿（直根系）取样进行根系形态扫描、单根抗拉和整株拉拔试验。结果1）随生长时间增加，上述草类根系的抗拉、抗拔强度均先增后减，同一生长时间须根系的抗拉/拔强度分别为直根系的1.21~2.89、5.34~6.01倍。2）根系的抗拉强度与根径、抗拔强度与拉拔处直径均呈幂函数关系，随生长时间增加前者的函数方程式指数绝对值均呈增大趋势 ...
陈晓华 +6 more
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Shuitu Baochi Xuebao, 1994 该文通过对海堤林带树木根系及土壤抗冲，抗蚀和渗透性的测定分析，发现同一地段土壤的抗冲，抗蚀指数表土层大于底土层。树木根系，尤其是根径≤２ｍｍ的细根有较强的固特土壤功能，抗冲指数与根长，根量间有明显的相关性，单相关系数分别为０．９３２６和０．８２５６。吸机质含量高的土壤抗蚀性强，抗蚀指数大，与有机含量间的相关系为０．８９３１，与细根的根长和根量的相关性相对较低，单相关系数分别为０．８２１６和０ ...
张金池 康立新
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