headwaters

n.

源头，上游；水源；河源；

1. They were born in the headwaters of some stream.
   他们是出生在某一小河上游源头。
2. These mountain slopes feed the true headwaters of the Ganges.
   这些山脉才是恒河水的真正源头。

Headwaters of the zebrafish -- emergence of a new model vertebrate.
Disappearing Headwaters: Patterns of Stream Burial Due to Urbanization
Rain Forests of the Ok Tedi Headwaters, New Guinea: An Ecological Analysis
Stormflow generation in steep forested headwaters: a linked hydrogeomorphic paradigm.
Fire Effects on Resprouting of Shrubs in Headwaters of Southeastern Longleaf Pine Savannas
Grunwald DJ & Eisen JS.Headwaters of the zebrafish − emergence of a new model vertebrate. Nat Rev Genet 3: 717−724
Hydrologic Connectivity and the Contribution of Stream Headwaters to Ecological Integrity at Regional Scales
Ecological Linkages Between Headwaters and Downstream Ecosystems: Transport of Organic Matter, Invertebrates, and Wood Down Headwate...
Understanding Processes and Downstream Linkages of Headwater Systems Headwaters differ from downstream reaches by their close coupli...
Understanding Processes and Downstream Linkages of Headwater Systems Headwaters differ from downstream reaches by their close coupli...