Shuitu Baochi Xuebao[目的] 综合评价北京山区不同植被恢复类型土壤质量,并进一步确定影响土壤质量的关键因素,为该地区植被恢复与重建提供数据支撑。[方法] 以立地条件相近的侧柏纯林、油松纯林、侧柏油松混交林、侧柏针阔混交林、油松针阔混交林、落叶阔叶混交林和无林地(对照)为研究对象,测定14个土壤理化指标作为土壤质量评价的总数据集(TDS),采用主成分分析法(PCA)和Pearson相关性分析建立土壤质量最小数据集(MDS),利用线性(L)和非线性(NL)2种评分方法计算土壤质量指数(SQI)和一般线性模型(GLM ...
李鹏 +10 more
doaj
[A clinical study on the centralized occlusal scheme for implant-supported overdentures in edentulous patients]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanDiao C, Wang S, Li M, Pan S, Liu Y.
europepmc +1 more source
[The Impact of Oral Microecology on the Development of Inflammatory Bowel Disease]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue BanWan K, Yang C, Chen N, Chen F.
europepmc +1 more source
[Key role of biomechanical properties and material selection in rotator cuff repair]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiCai X, Zhou Y.
europepmc +1 more source
[State-of-the-art in peripheral nerve injury diagnosis and therapy]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiSun J, Chen L.
europepmc +1 more source
Shuitu Baochi Xuebao[目的] 为了在大气CO2浓度不断升高的背景下准确估算植被净初级生产力(NPP)。在Carnegie-Ames-Stanford Approach (CASA)模型中引入CO2浓度因子,来模拟不同植被类型的最大光能利用率,并在此基础上对改进后模型的NPP估计潜力进行探索。[结果] 2000—2020年,年平均大气CO2浓度在中国陆地范围均表现为显著升高趋势,平均增幅为2.14 μmol/(mol·a);纳入CO2胁迫因子后,植被类型按最大光能利用率从大到小为农田＞常绿阔叶林＞混交林＞针叶林＞灌丛＞湿地 ...
郑泽豪 +5 more
doaj
[Retrospect and Prospect of Immune Caries Prevention Research in China]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue BanXu Q, Fan M.
europepmc +1 more source
2000—2020年青海河湟谷地植被NDVI时空变化及影响因素
Shuitu Baochi Xuebao[目的] 为了解青海河湟谷地植被时空变化情况,明晰气候变化、土地开发利用及人类活动等因素对植被变化的影响。[方法] 利用2000—2020年MODIS NDVI数据集表征植被变化,基于Theil-Sen Median趋势检验法、偏相关性分析、地理探测器等方法,探究青海河湟谷地NDVI时空变化情况及其与气温、降水、坡度、土壤类型和人类活动等影响因素的关系。[结果] (1)近20年河湟谷地植被NDVI呈波动增长趋势,显著增长区域面积为2.21×104 km2(p＜0.05),占河湟谷地总面积的53.39 ...
李小宇 +3 more
doaj
[Arthroscopic-assisted closed reduction and internal fixation with absorbable screws for Hawkins type <b>Ⅱ</b> talar neck fractures]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiDong Z +6 more
europepmc +1 more source
[Methodological appraisal of statistical approaches to evaluating the impact of chronic graft-versus-host disease on mortality after hematopoietic stem cell transplantation]. [PDF]
Zhonghua Xue Ye Xue Za ZhiWu JJ, Wang JF.
europepmc +1 more source