Results 1 to 10 of about 741 (148)

Ceramide changes in abdominal subcutaneous and visceral adipose tissue among diabetic and nondiabetic patients 糖尿病和非糖尿病患者腹部皮下和内脏脂肪组织神经酰胺的变化

open access: yesJournal of Diabetes, Volume 14, Issue 4, Page 271-281, April 2022., 2022
Highlights The gender‐specific role of sphingolipids in obesity‐related metabolic dysfunctions is unclear. The aim of this study is to identify ceramide species by liquid chromatography‐mass spectrometry that accumulate in central fat in relation to status of diabetes and gender for subjects with a body mass index ≥40 kg/m2 or > 35 kg/m2 with ...
Michelle Brusatori   +7 more
wiley   +1 more source

青藏高原东北边缘云杉属-冷杉属林火烧迹地枯落物持水特征

open access: yesShuitu Baochi Xuebao, 2023
以青藏高原东北边缘云杉属-冷杉属林火烧迹地为研究对象,基于典型抽样法于2020年8月和2021年7—8月在火烧迹地和未过火天然林采集枯落物样品,采用室内浸泡法测定分析枯落的蓄积量、持水量、有效拦蓄量等指标,探究林火干扰下不同坡位枯落物的水文效应,为更好地促进森林水源涵养以及水土保持功能提供依据。结果表明:(1)在植被恢复过程中,枯落物的厚度和蓄积量随着恢复年限的增加而增加,且厚度为3.75~8.31 cm,蓄积量为6.16~8.13 t/hm2。恢复5,15年火烧迹地上、中 ...
贺万鹏   +6 more
doaj  

不同林分枯落物层的水文生态功能

open access: yesShuitu Baochi Xuebao, 2005
分析了八达岭林场4种林分枯落物层的蓄积量、持水能力、阻滞径流速度和减流减沙的效应。结果表明:①油松的总蓄积量为29 20t/hm2,最大持水量为61 36t/hm2,有效拦蓄量为19 38t/hm2;侧柏总蓄积量为4 62t/hm2,最大持水量为57 84t/hm2,有效拦蓄量为16 58t/hm2;元宝枫总蓄积量为17 76t/hm2,最大持水量为30 92t/hm2,有效拦蓄量为71 73t/hm2;刺槐总蓄积量为10 26t/hm2,最大持水量为43 12t/hm2,有效拦蓄量为24 63t ...
张振明 余新晓 牛健植 鲁绍伟 宋维峰 刘秀萍 张颖
doaj   +2 more sources

工程堆积体上不同植被类型枯落物和土壤水文效应

open access: yesShuitu Baochi Xuebao, 2021
为探讨工程堆积体不同植被类型的枯落物特征、枯落物持水及拦蓄能力、土壤物理性状和土壤涵水性能,采用室内浸水法和环刀法分别对工程堆积体植被与原生植被的枯落物及0—20 cm土层的持水能力进行研究。结果表明:(1)不同植被类型枯落物厚度及蓄积量均存在显著差异(P灌木林>乔木林。(3)各植被类型土壤最大持水量及毛管持水量均存在显著差异(P灌木林>乔木林。从堆积体枯落物和土壤持水能力角度来看,草灌混交这一搭配模式可以作为工程堆积体的先锋植被,用于在堆积体初期构建稳定群落生态结构 ...
丁鹏玮   +3 more
doaj  

不同密度马尾松人工林枯落物输入对土壤理化性质的影响

open access: yesShuitu Baochi Xuebao, 2022
为研究不同密度马尾松人工林枯落物输入对土壤理化性质和林分生长影响,选择适宜的人工林经营措施提供参考。以2 500,3 300,4 500,6 000株/hm2(分别记为M1、M2、M3和M4)4种造林密度的马尾松人工林为研究对象,利用结构方程探究不同密度马尾松林枯落物输入对土壤性质的影响。结果表明:林分密度对枯落物和土壤理化性质均具有显著影响,其中枯落物总蓄积量和持水量表现为M2密度最大,显著高于其他密度;同时M2密度中枯落物碳、氮、磷、钾养分储量最大,以有机碳为主,占总储量的96.98 ...
李鹏   +6 more
doaj  

Do public works programmes foster climate resilience? Conceptual framework and review of empirical evidence

open access: yesInternational Social Security Review, Volume 78, Issue 2-3, Page 145-171, April-September 2025.
Abstract Public works programmes (PWPs) are pervasively used to tackle poverty and unemployment, and to build infrastructure and skills in low‐ and middle‐income countries. While their impacts on poverty, food security and labour outcomes have been widely documented, there is little research focusing on the role of PWPs in supporting household climate ...
Francesco Burchi   +3 more
wiley   +1 more source

Understanding teacher professional commitment from a positive psychology perspective: A case from Myanmar's Chinese language teachers

open access: yesThe Modern Language Journal, Volume 108, Issue 1, Page 222-242, Spring 2024.
Abstract In response to the issue of Chinese language teacher attrition in Myanmar, this study aimed to examine the professional commitment of these teachers, with a focus on how their commitment is constructed and shaped within the local context. The study adopted a theoretical lens of positive psychology and utilized a hermeneutic phenomenological ...
Yue Peng, Kaiyang Lou, Tao Xiong
wiley   +1 more source

两种贻贝对麻痹性贝类毒素蓄积代谢及生理应激的比较研究

open access: yesHaiyang yu huzhao
贻贝是我国沿海常见的经济贝类,作为监测海洋污染情况的前哨物种对多种贝类毒素均具有较强的蓄积能力,但不同贻贝蓄积能力的种间差异尚不清晰。基于贝类软组织质量比原则,将紫贻贝与厚壳贻贝分别暴露于链状亚历山大藻,研究两种贻贝对麻痹性贝类毒素(paralytic shellfish toxins, PSTs)的蓄积代谢与生理应激差异。结果表明,紫贻贝和厚壳贻贝中PSTs最高蓄积量分别为889.1和358.6 μg STXeq/kg,前者超出后者的2倍。代谢3天后,厚壳贻贝PSTs的清除率为88.8 ...
杨 越聪   +6 more
doaj   +1 more source

合肥市森林碳储量及碳密度研究

open access: yesShuitu Baochi Xuebao, 2011
利用合肥市第7次森林资源清查资料,对各县(区)森林面积、生物量及其年龄结构进行统计,依据建立的不同森林类型生物量和蓄积量之间的回归方程,估算全市森林蓄积量,并根据含碳率推算森林碳储量和碳密度。结果表明:全市森林多集中在三县,以中幼林为主,森林总面积为47 983.4 hm2,蓄积量为523 239 m3,生物量为231 260.87 t,碳储量为115 630.43 t,碳密度为2.41 t/hm2;以杨类的面积最大,马尾松的生物量、蓄积量和碳储量最大;森林面积以幼龄林最大,随年龄增加而减少 ...
刘西军, 徐小牛, 洪安东
doaj  

关帝山不同林分结构华北落叶松林枯落物水文效应

open access: yesShuitu Baochi Xuebao, 2021
为研究北方山区典型人工林水源涵养效应和更新状况,选取吕梁山脉落叶松纯林为研究对象,采用室内浸水法测定不同林分密度下枯落物的持水性能,用RDA冗余度分析法探究林分结构对枯落物厚度和拦蓄功能的相关关系。结果表明:(1)不同密度华北落叶松样地的枯落物厚度为0.84~4.50 cm,蓄积量范围为9.64~24.14 t/hm2,350株/hm2样地蓄积量最大,200株/hm2样地最小。(2)样地最大持水量范围为27.12~62.07 t/hm2,500株/hm2样地持水量最大,150株/hm2样地最小 ...
梁文俊   +5 more
doaj  

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