Results 21 to 30 of about 1,565 (118)
Our research allows us to understand the predictors of extinction risk in traditional Chinese medicinal (TCM) plant species with known threat status, and incorporate this knowledge to predict other TCM plants with unknown conservation status in China so as to improve the overall effectiveness of conservation strategies.
Yuhan Zheng +4 more
wiley +1 more source
为了探究海拔高度与土壤理化性质之间的关系,对秦岭火地塘林区不同海拔高度土壤理化性质进行研究。在不同海拔高度设置样地,对土壤进行分层取样,室内测定土壤pH值、有机质、全氮、全磷、全钾、有效氮、有效磷和有效钾含量。结果表明:(1)在不同采样深度下,随着土壤深度增加,除土壤pH值逐渐升高外,有机质、全氮、有效磷和有效钾的含量逐渐降低,其他指标无明显变化规律;(2)土壤pH值、有机质、全氮和有效磷含量与海拔之间有显著的相关关系,土壤pH值随海拔升高先逐渐升高,最高点出现在海拔1 800~2 000m ...
张巧明 +3 more
doaj
Read the free Plain Language Summary for this article on the Journal blog. Abstract The nested subset pattern (nestedness) has been widely used to explain species distributions in island and fragmented systems. Mountain sky islands serve as critical natural laboratories for understanding the evolutionary consequences of geographic isolation and climate
Caiwen Zhang +5 more
wiley +1 more source
为了深入研究海拔03 000 m范围海拔对交流输电线路导线起始电晕特性的影响,基于可移动式电晕笼,在武汉、西宁、海北进行了交流6×LGJ-400/50导线的电晕特性试验,用紫外成像仪记录导线电晕放电后产生的光子数。利用"切线法"求取导线的电晕起始电压。通过武汉、西宁和海北3个海拔点导线在晴朗天气下的电晕起始电压测量结果,发现导线起晕电压随海拔升高而显著下降。海拔每升高1 000 m,导线起晕电压降低8.12%。且它们不适合用GB/T 2317.2—2000或GB/T 775.2 ...
律方成 +4 more
doaj
Abstract Large old trees are important ecological entities in human settlements, providing cultural values and ecological services that are threatened by current and future changes in global climate, land use and disturbance regimes. Some studies suggest incorporating social and cultural significance into the conservation of large old trees.
Zhuo Cheng +5 more
wiley +1 more source
高海拔下比平原地区气体密度小,放电电压降低。因此,高海拔应增加线路的绝缘强度。在绝缘子串中多采用几片绝缘子来改善绝缘子串电压分布。本文依据架空线路设计规程计算了高低海拔500 kV线路采用U210B瓷质绝缘子应当选取的片数,并依此搭建了高低海拔绝缘子串的等效电路,计算并比较了其电压分布。在高低海拔的等效电路中,通过改变劣化绝缘子的位置和数目,计算劣化绝缘子的电压降,对比分析研究劣化绝缘子对不同海拔电压分布的影响。结果表明:相同情况下,高海拔劣化绝缘子的电压降百分比更大 ...
罗浩 +7 more
doaj
The impact of various restoration strategies on biodiversity and biomass in degraded savannas was evaluated across different elevation gradients. Natural regeneration co‐benefits the increasing in biodiversity and biomass in savannas, while active restoration exhibits altitude‐dependent efficacy and lower biomass accumulation capacity.
Han Zhang +10 more
wiley +1 more source
利用舟山浮标站和海岛自动站2011年全年测风数据资料,对舟山海域浮标风力和附近非遮蔽高海拔海岛站以及不同海域无遮蔽海岛站、遮蔽海岛站的风力进行了对比分析,结果表明:1)浮标站大风日数比非遮蔽海拔较高海岛站以及传统大风指标站嵊泗明显偏少,比遮蔽海区海岛站多.2)浮标站年平均风速小于非遮蔽高海拔站,同嵊泗、西磨盘接近,大于遮蔽海区海岛站.3)浮标站大风日数和平均风速具有明显的月际变化特征,秋冬季明显多于春夏季.4)对比不同风向的大风过程可得:浮标站与其他海岛站的风速差值不仅与季节变化、海拔高度有关 ...
LIYun(李云) +3 more
doaj +1 more source
The leaf functional traits of angiosperms and gymnosperms in mountain ecosystems significantly influence phyllosphere fungal diversity. These traits are critical for understanding fungal stress resistance and elevational adaptation, which aids in predicting plant responses to climate change.
Xiaocheng Yu +7 more
wiley +1 more source
粉红胸鹨(Anthus roseatus)是卧龙自然保护区的夏候鸟,高山草甸的优势种类。笔者自1979年以来,在春季对比鸟的垂直迁移进行了一些观察。1988年春季,又进行专题观察,现报告如下: 观察区概况卧龙自然保护区位于四川盆地向青藏高原过渡的高山峡谷地带;东南低,西北高;最低海拔1 200米,最高海拔6 250米。海拔1 600米以下为山地亚热带常绿阔叶林带;海拔1 600—2 000米为山地暖温带常绿,落叶阔叶林带;海拔2 000—2 600米为山地温带针阔叶混交林带;海拔2 600—3 ...
李洪成
doaj

