headwater

n.

（河流）上游源头；

1. Maqu Wetland is the crucial headwater of the Yellow River, whose protection counts for the sustainable regional development and safety of the whole Yellow River.
   玛曲湿地作为黄河上游的重要水源地，它的发展不仅关乎到本地区经济的可持续发展，更事关黄河水资源的安全，关系到整个国家的生态和经济安全。

The Contribution of Headwater Streams to Biodiversity in River Networks
Transport and fate of nitrate in headwater agricultural streams in Illinois.
Control of nitrogen export from watersheds by headwater streams.
Fish Community Structure and Function along Two Habitat Gradients in a Headwater Stream
Parent Lithology, Surface-Groundwater Exchange, and Nitrate Retention in Headwater Streams
INVERTEBRATE BIODIVERSITY IN AGRICULTURAL AND URBAN HEADWATER STREAMS: IMPLICATIONS FOR CONSERVATION AND MANAGEMENT
Freshwater Shrimp Effects on Detrital Processing and Nutrients in a Tropical Headwater Stream
A cross-system comparison of bacterial and fungal biomass in detritus pools of headwater streams
Understanding Processes and Downstream Linkages of Headwater Systems Headwaters differ from downstream reaches by their close coupli...
Leaf litter decomposition and microbial activity in nutrient‐enriched and unaltered reaches of a headwater stream