This field study investigated the nitrogen concentrations in the shallow groundwater from an ephemeral stream and four l......

该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生......

在理清林地集约利用概念的基础上,从经济、社会、生态等方面选择了12个指标,构建了1套科学的林地集约利用评价指标体系.为了消除不......

Measurements of concentrations of easily extractable soil nitrogen(N)were carried out on samples collected at the Heron ......