浑善达克沙地榆天然更新问题-研究

《浑善达克沙地榆天然更新问题-研究》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、目录1引言....................................................................................................................................................11.1研究背景...................................................................................................................

2、...............11.2沙地榆研究现状.................................................21.2.1沙地榆生物生态学特性研究现状..................................21.2.2浑善达克沙地榆更新研究现状....................................32研究区概况.........................................................42.1浑善达克沙地概况................

3、...............................................................................................42.1.1地理位置及分布................................................42.1.2地质地貌......................................................42.1.3气候特征..............................................

4、........52.1.4水文..........................................................52.1.5土壤..........................................................52.1.6植被..........................................................62.2调查区概况......................................................63研究内容与

5、方法......................................................63.1研究内容..................................................................................................................................63.2研究方法及样地选择.....................................................................

6、......................................73.2.1野外调查样地选择及研究方法....................................73.2.2室内盆栽试验设计及研究方法....................................94结果与分析.........................................................104.1沙地榆更新现状....................................................

7、..............................................................104.1.1沙地榆种子扩散情况...........................................104.1.2各调查样地不同龄级沙地榆保存情况.............................114.2影响沙地榆更新的自然因素分析..................................................................................14

8、4.2.1种子数量与质量...............................................144.2.2地表