Results 41 to 50 of about 9,812 (161)
On the marine productivity: cases in the North Western Pacific and South China Sea [PDF]
, 2016 海洋生产力相关过程(初级生产力、新生产力、再生生产力)是海洋生态系统物质循环和能量流动的重要基础，是调节大气CO2水平和全球气候的关键过程。海洋生产力与营养盐的供给和氮营养盐组成紧密相关，中尺度物理过程(冷涡、暖涡)通过改变海表营养盐状态对生产力产生重要影响，因此，系统研究不同海区以及中尺度过程下的海洋生产力过程，对深入理解海洋生产力，揭示海洋生产力对全球气候的调控具有重要意义。 本研究通过同时应用13C、15N等多种人工同位素标记示踪技术，在2014年春季和夏季 ...
何萌
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Conservation Biology, EarlyView.Abstract Illegal wildlife trade (IWT) is one of the largest global illegal activities, and it negatively affects biodiversity and sustainable development worldwide. DNA barcoding coupled with high‐throughput sequencing (i.e., metabarcoding) is useful in identifying taxa affected by IWT and has been used routinely for decades.
Maria Joana Ferreira da Silva +9 more
wiley +1 more source
晋西北丘陵风沙区50年林龄人工柠条林植被群落及其土壤特性变化
Shuitu Baochi Xuebao, 2022 为探究晋西北丘陵风沙区50年林龄人工柠条林植被群落特征及土壤环境因子的变化规律。在0(撂荒地), 12, 18, 40, 50年的时间序列上, 分析柠条生长性状、土壤含水量、土壤养分及植物群落特征等变化动态。结果表明: (1)随着人工柠条林种植年限的增加, 柠条盖度和株高在时间梯度上显著增加, 具体表现为, 种植后期(40~50年)的柠条盖度是种植前期(0~12年)的1.98倍, 柠条株高在种植后期(40~50年)是种植前期(0~12年)的1.48倍; 柠条密度随种植年限的增加而显著降低, 从种植前期 ...
刘婧 +4 more
doaj
, 2000 萼花臂尾轮虫（Ｂｒａｃｈｉｏｎｕｓ ｃａｌｙｃｉｆｌｏｒｕｓ Ｐａｌｌａｓ）休眠卵在不同萌发条件下累积萌发率的结果显示：保存在休眠卵形成的原液中，温度为２０℃－３０℃时萌发率均较高，３０℃时用过滤湖水萌发时的萌发率最高（６５％）；保存在无机培养液中的休眠卵，用曝气自来水萌发时最高，用湖水次之，无机液萌发效果较差２０℃和２５℃时三种萌发液中的萌发率接近；母体投喂小球藻形成的休眠卵的累积萌发率高于投喂混合藻组，且以过滤湖水为孵化液时效果较佳；累积萌发率与光照时间的长短并无直接关系（Ｐ＞０．０５ ...
杨家新,黄祥飞
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Previous research has established the relationships between motivation, anxiety, teachers’ support, and self‐regulated learning (SRL) in English‐as‐a‐foreign‐language (EFL) learning. Most of the studies, however, have taken a variable‐centered approach in addressing the variable correlations, while learners’ characteristics and variable links ...
Yuhong Jiao, Barry Bai, Jing Li
wiley +1 more source
The foraminiferal taxa in surface sediment and its environmental implication in Sansha Bay [PDF]
, 2016 有孔虫对所生存的环境变化较敏感。对于不同的水深、温度、盐度、pH、沉积速率等环境因子的变化，有孔虫群落特征会发生相应变化。故有孔虫群落特征能较好地反映海洋环境变化。由于季节的变化，夏季和冬季所对应的环境因子条件不同，其有孔虫群落特征也会发生相应变化。本论文根据福建三沙湾的夏冬季24个站位表层沉积物样品，进行有孔虫鉴定和沉积物粒度分析。在广泛收集前人资料及室内分析的基础上，结合表层沉积物中七种重金属含量平面分布特征，通过研究分析有孔虫种群的空间分布及其与环境因子间相互关系 ...
龚凌
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Genomic responses to increased temperature and pollinator selection in Brassica rapa L.
New Phytologist, EarlyView.Summary Rapid environmental change reshapes both abiotic stress and biotic interactions, yet it remains unclear how these combined forces structure plants' genomic adaptation. In particular, the joint influence of temperature and pollinator identity, two ecological axes undergoing simultaneous global shifts, has rarely been quantified at genomic ...
Yanqian Ding, Florian P. Schiestl
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2007 对天台大雷山4个不同生境（常绿阔叶林、灌丛、竹林和杉木林）夏蜡梅群体的果实、种子形态变异及其与环境因子的相关性进行了研究.测量的果实和种子12项形态学指标表明，果实和种子的性状以灌丛生境最优、其次是竹林生境、最差的是常绿阔叶林生境.表型性状在群体间和群体内都存在着一定程度的变异，其中群体间的变异系数的平均值从61.71（每果种子数）到7.51（种子厚）.夏蜡梅种子形态较果实形态穗定.单因素方差分析显示，夏蜡梅果实和种子形态在不同生境间差异显著，其中80%以上的变异来源于生境内 ...
ZHANGWen-biao(张文标) +1 more
doaj +1 more source
Response of stable states of simple marine plankton ecosystems to warming [PDF]
, 2016 温度是影响海洋浮游生态系统结构和功能的关键环境因子。从上个世纪初以来，受到人类排放温室气体的影响，全球海洋平均温度明显升高。但温度影响浮游生态系统变化和浮游生物生物量变动的机制还不明确。本文采用理论模型与实验生态相结合的方法探究温度对简单浮游生态系统稳态的影响，并一同考虑营养盐的输入，得到如下主要结果： 1.建立描绘以亚心形扁藻(PlatymonasSubcordiformis，绿藻)为被捕食者、海洋尖尾藻(Oxyrrhismarina，甲藻 ...
李奕慧
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Conservation Biology, Volume 40, Issue 1, February 2026.Abstract Exploring heat tolerance and acclimation capacity can provide an effective approach to evaluating species’ sensitivity to extremely high temperatures due to climate warming. Despite some work on amphibian and reptile thermophysiological adaptation, related questions remain. We reviewed the literature to provide a synthesis of worldwide data on
Zijian Sun +8 more
wiley +1 more source