群体关系结构特征对流动儿童孤独感的影响外群体认同的中介作用

流动儿童是指随父母或其他监护人在流入地暂时居住半年以上6-14岁（或7-15岁）的儿童;改革开放至今,流动儿童数量不断增长,截至2013年,此规模已达到3 581万。城乡之间文化差异悬殊,流动儿童在社会适应方面面临着种种压力和困难。许多研究者认为流动严重影响了儿童的心理健康,并引发了一系列的心理问题：孤独、焦虑、抑郁等。</p

Soil physicochemical properties and influencing factors on Xiaoqin Island

belt transect and sample methods． Pearson correlation analysis，one-way ANOVA analysis and least significant difference (LSD) multiple comparison based on SPSS 24.0 were used to study the statistical characteristics of soil physical measured and chemical properties and influencing factors on Xiaoqin Island． The average soil gravel ratio and water content are 20.04% and 7.35%，respectively． The average values of ammonium nitrogen，available potassium，available phosphorus and organic matter are 23.67，212.77，16.15mg /kg and 28.4g/kg，respectively，which is cdassified as the fifth，first，third and third grade，respectively． However，most of soil belongs to the third grade． Organic matter correlated positively in high significants with water content，ammonium nitrogen and available phosphorus． The physical and chemical properties of soil are mainly affected by vegetation and aspect． This profound study on one of Miaodao Islands is aimed to provide knowlege for the ecological protection and development of the island