野生动物学报, 2017 贵州草海湿地是中国西南地区的重要湿地,是黑颈鹤(Grus nigricollis)等珍稀水鸟的重要越冬地。近年来,黑颈鹤在草海湿地越冬种群数量呈逐年增长趋势,到2014～2015年超过1 700只,因而草海湿地对物种保存和保护物种多样性存在极其重要的作用。但草海保护区被城镇和农业区包围,当地居民长期过度依赖于草海的自然资源和生态资源,加之草海土地权属限制、资源无序开发、环境污染严重、外来物种入侵、水土流失以及社区发展与生态保护矛盾突出等问题,对草海湿地生态造成严重的破坏,影响着黑颈鹤等珍稀鸟类的生存 ...
冉景丞 蒙文萍 粟海军 张明明
doaj
[Determination of organophosphate diesters in facility vegetable soils using ultra-high performance liquid chromatography-electrostatic field orbitrap high resolution mass spectrometry]. [PDF]
Se Pu, 2023 Liu M +7 more
europepmc +1 more source
Shuitu Baochi Xuebao, 2017 探讨樟子松人工林林下土壤粒度特征随林分密度的变化及影响，以期为毛乌素沙地以樟子松为建群种的植物固沙模式提供理论依据。以陕西省榆林市珍稀沙生植物保护基地内8个密度梯度（925～2 700 株/hm2）的沙地樟子松人工林为研究对象，分别采集0—20，20—40 cm 2层土壤样本，测定土壤粒度组成，计算分析平均粒径、标准偏差、偏度、峰态值和分形维数。结果表明：研究区各层土壤粒度组成以砂粒为主，其次是粉粒、黏粒；粒度特征整体呈现粒径较粗、分选较差、偏态正和峰态为中至窄的特点，土壤分形维数分布于1.422～2 ...
马成忠, 丁国栋
doaj
[Determination of polybrominated diphenyl ethers in marine sediments by composite chromatography column purification-gas chromatography-negative chemical ionization-mass spectrometry]. [PDF]
Se Pu, 2023 Dong JY +6 more
europepmc +1 more source
野生动物学报, 1988 澳大利亚的国土总面积7,682,300平方公里,森林总面积40多万平方公里（私有林占21％）。有哺乳动物250种,其中230种为特有种;鸟类770种,530种为特有种;爬行类600多种;两栖类178种。在这些动物中,有152种属濒危种,其中哺乳类占41种,鸟类96种,爬行类6种,两栖类9种 ...
孟沙, 徐军
doaj
[Latest research progress of rare earth-magnesium alloys in orthopedics]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoSun Z, Zuo K, Zhu X, Yue H, Gao Z.
europepmc +1 more source
[Applications and prospects of biodegradable rare earth magnesium alloys as bone implant materials]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiYue H, Zhu X, Gao Z, Sun Z.
europepmc +1 more source
[Determination of 26 herbicide residues in soil， sediment， and surface water samples using modified QuEChERS method combined with ultra-high performance liquid chromatography-tandem mass spectrometry]. [PDF]
Se PuZhao L, Ma L, Huang LQ, Chen JB, Zhu WF.
europepmc +1 more source
[Evaluation of Gradient-Variant Quantum Dot Fluorescence Technology for Rapid Detection of <i>Brucella</i>]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue BanLi J +9 more
europepmc +1 more source
[Biocompatibility of 3D printed biodegradable WE43 magnesium alloy scaffolds and treatment of bone defects]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanMin S, Tian Y.
europepmc +1 more source