subsurface flow wetland是什么

subsurface flow wetland是什么 subsurface 意思? 为什么说磷P是湖泊中的主要限制性营养元素?氮N是河口中的主要限制营养元素?两者有什么区别?Nitrogen enters ground water and surface water through seepage and lateral subsurface flow primarily as NO3-N and is generall cash-flow FLOW 是什么意思 flow through FLOW怎么样 flow-through technique flow PRE-FLOW PLMM flow calibrated flow 请问下pull flow 和 push flow love will flow discounted cash flow flow cytometric analysis是什么意思 run off out flow flow into 的用法