Results 111 to 120 of about 2,191 (179)

黄土丘陵区两典型森林生态系统生物量、 碳氮库和碳固存特征研究

, 2015
黄土高原是我国水土流失最为严重的地区之一。主要突出的环境问题是水土 流失和植被退化。 植被恢复和重建是防止水土流失、改善生态环境的根本途径。 植被恢复重建技术主要为天然恢复和人工重建（即人工林种植）。为此国家在该 区域开展了“三北”防护林工程、天然林保护工程和退耕还林还草等一系列重大 生态工程。这些生态项目实施以来, 生态环境得到明显改善；黄土丘陵区作为植 被建设重点区，也是重要的增汇潜力区。森林碳汇是当前生态学研究热点，且黄 土丘陵区正面临植被恢复后固碳氮现状 ...
宋变兰
core  

[Aerobic exercise regulates macrophage polarization and improves insulin resistance in mice: the mediating role of miR-221-3p]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Li N, Zhang L, Guo Q, Zhou Y, Liu C.
europepmc   +1 more source

开垦对绿洲农田碳氮累积及其与作物产量关系的影响

, 2011
以新疆策勒绿洲近百年来不同开垦年限农田为研究对象，采用空间序列换算时间序列的方法，研究绿洲农田开垦过程中土壤有机碳和全氮密度、碳氮比( C/N) 及速效氮含量的垂直变化特征，并探讨了农田土壤碳氮变化与作物产量的关系。结果表明: 荒漠土壤开垦后，显著增加了表层土壤( 0—20 cm) 有机碳和全氮密度，随开垦年限延长对深层土壤( 40—200 cm) 有机碳密度也有一定的影响，如在开垦30 a 左右时下降了36． 4%，但在100 a 左右时则增加了52． 0%。耕层土壤C/N 随开垦年限延长而明显增加 ...
刘镇, 安桂香, 曾凡江, 雷加强, 黄彩变   +4 more
core  

[Research progress on ionic liquid-functionalized magnetic Fe₃O₄ nanomaterials in sample pretreatment- chromatographic analysis]. [PDF]

Se Pu
Li JX, Zhao LZ, Sun XM, He ZQ, Cao HL, Luo YJ, Yang B.   +6 more
europepmc   +1 more source

干旱区典型城市群不透水地表扩张对土壤有机碳的影响

, 2016
城市化对生态系统碳循环有重要影响，人工不透水地表(Impervious Surface Area，ISA)是城市地表的主要组成。由于对ISA所封存土壤有机碳(SOCISA)含量及分布格局缺乏认识，导致全球和区域碳评估中大量采用高度简化的假说来估计城市土壤碳库，这些假设直接影响到碳循环研究中对城市化效应的评估精度。为揭示不透水地表下的土壤理化性状，量化城市建设对土壤碳库的影响，本研究采集天山北坡城市群在建工程ISA下100-cm深土壤样本，并与其邻近透水面(Pervious Surface Area ...
艳燕
core  

[Exercise-induced hyperinsulinism: genetic basis and clinical management]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Zhang QT, Hou L.
europepmc   +1 more source

[He<b>'</b>s Yangchao recipe ameliorates premature ovarian insuf-ficiency by remodeling intestinal microbiota to promote granulosa cell glycolysis]. [PDF]

Zhejiang Da Xue Xue Bao Yi Xue Ban
Lin F, Liu Q, Zhao Y, Chen Y, Wang R, Miao C, Zhang Q.   +6 more
europepmc   +1 more source

[<i>Poria cocos</i> polysaccharide alleviates cyclophosphamide-induced intestinal barrier dysfunction and inflammation in mice by modulating gut flora]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Zhang Y, Duan Y, Zhang C, Yu L, Liu Y, Xing L, Wang L, Yu N, Peng D, Chen W, Wang Y.   +10 more
europepmc   +1 more source

[Guidelines for the diagnosis and treatment of common neonatal diseases in primary healthcare institutions: neonatal jaundice (2025)]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Subspecialty Group of Neonatology, Society of Pediatrics, Chinese Medical Association; Editorial Board of ChineseJournal of Contemporary Pediatrics.   +2 more
europepmc   +1 more source

[Determination of 18 Perfluorinated Compounds in Tea Leaves by a Quick, Easy, Cheap, Effective, Rugged, and Safe Method Combined With Ultra-High Performance Liquid Chromatography-Tandem Mass Spectrometry]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban
Sun W, Chuai Y, Zhou X, Zhang T, Yong L, Ren L, Luo X, Zou X.   +7 more
europepmc   +1 more source