Results 51 to 60 of about 13,871 (159)
ABSTRACT This paper examines the features of metadiscourse across different teacher moves in university linguistics classroom discourse and the teaching strategies reflected in its use. The results reveal that teachers employ diverse metadiscourse during classroom interactions to support student reasoning.
Jingjie Li, Wenjie Hu
wiley +1 more source
为对比分析林分密度对枯落物层水文生态功能的影响,以晋西黄土区6种不同密度(475,900,1 200,1 575,1 825,2 350株/hm2)刺槐(Robinia pseucdoacacia)人工林为对象,采用样地调查与室内试验相结合的方法,对其枯落物层总厚度、总蓄积量、最大持水量、有效拦蓄量、枯落物持水量与浸水时间的关系、枯落物吸水速率与浸水时间的关系等水文特征进行研究,以期从中提出该区刺槐林经营的合理密度,为充分发挥水土保持功能、实现功能导向型植被调控与优化配置提供理论依据。结果表明:(1 ...
周巧稚 +5 more
doaj
Abstract Identifying refugia from emerging threats is vital to ensure the persistence of rare and threatened species, but modeling habitat distribution for these species is challenging and the role of people in refuge management is rarely considered. Myrtle rust is an emerging infectious disease that represents a grave threat to the rare wetland tree ...
Sarah M. Herbert +7 more
wiley +1 more source
研究黄土区高标准梯田生态服务功能的变化特征,探讨坡改梯工程对高标准梯田生态服务功能价值的影响趋势和潜力,可为黄土丘陵区探索低投入、高效用和可持续农业发展模式提供理论基础。在庄浪县采用机会成本法和影子工程法等生态经济学方法,界定了黄土区高标准梯田的生态服务功能,选取土壤肥力保持功能、水土保持功能、土壤水分涵养功能3类生态服务功能,构建了高标准梯田生态功能的物质量模型和价值量模型,评估了高标准梯田的生态服务功能和价值。结果表明:每公顷高标准梯田每年为人类提供了约119 667.00 kg的总物质量和114 ...
王彦武 +5 more
doaj
Abstract Profiles of parental reflective functioning (PRF) may offer valuable insights into individual differences in PRF. Previous studies have identified PRF profiles; however, further validation is needed. This study aimed to investigate the convergent validity of the identified PRF profiles by examining their association with a related measure of ...
Eva Back Madsen +6 more
wiley +1 more source
为了研究大伙房水库流域森林生态系统枯落物层和土壤层水文效应,以流域内3种不同植被类型为研究对象,采用浸泡法、环刀法对其枯落物层和土壤层水文功能进行定量研究。结果表明:(1)3种植被类型枯落物蓄积量为23.20~39.11 t/hm2,表现为刺槐天然次生林 > 油松人工林 > 落叶松人工林,且阔叶林枯落物半分解层蓄积量大于未分解层,而针叶林则相反。(2)枯落物层最大持水量为50.24~109.19 t/hm2,有效拦蓄量为41.70~90.71 t/hm2,均表现为刺槐天然次生林 > 油松人工林 ...
涂志华 +8 more
doaj
ABSTRACT Groundwater governance is complex due to several externalities associated with groundwater being an invisible natural resource tied to the land with millions of extractors and limited means of exclusion. The paper traces the evolution of groundwater irrigation in India and the corresponding change in groundwater laws and policies to address ...
Anindita Sarkar, Amrita Sarkar
wiley +1 more source
Exploring the importance of aromatic plants' extrafloral volatiles for pollinator attraction
Summary Aromatic plants occur in many plant lineages and have widespread ethnobiological significance. Yet, the ecological significance and evolutionary origins of aromatic volatile emissions remain uncertain. Aromatic emissions have been implicated in defensive interactions but may also have other important functions.
Aphrodite Kantsa +3 more
wiley +1 more source
森林土壤具有良好的水文生态功能,其结构特征影响土壤的水分物理性质。研究了长江上游地区的贡嘎山东坡亚高山不同林型下土壤的结构特征,并采用平均结构直径和结构分形特征进行评价,同时还研究了土壤渗透性、持水性等水分特性。研究结果表明:成熟阶段的混交林地土壤结构性最好,具有较强的水文生态功能;采伐迹地最差;其他林地类型介于其间。在该地区生态环境受到较好的保护,成熟混交林和过熟林占80%以上,因此总体上说该区的土壤结构状况和水分效应也较好,但由于该区生态环境脆弱,仍需加强管护。
张保华 何毓蓉 等
doaj +2 more sources
Occurrences of dust storms and long‐distance movement of dust across landscapes is constantly increasing in south Asia. This dust is expected to have profound impact on vegetation health and sustainability as dust may contribute to nutrient budgets of the forest ecosystems, while it could impart various stresses to the plants.
Shree P. Pandey +2 more
wiley +1 more source

