AmeriFlux Radiological and Meteorological Data for Tonzi Ranch Site (AmeriFlux US-Ton Tonzi Ranch)

Located in the lower foothills of the Sierra Nevada Mountains, the Tonzi Ranch site is classified as an oak savanna woodland on privately owned land. Managed by local rancher, Russell Tonzi, brush has been periodically removed for cattle grazing. The overstory is dominated by blue oak trees (40% of total vegetation) with intermittent grey pine trees (3 trees/ha). Understory species include a variety of grasses and herbs, including purple false brome, smooth cat's ear, and rose clover. These two distinctive layers operate in and out from one another. Growing season of the understory is confined to the wet season only, typically from October to early May. In contrast, the deciduous blue oak trees are dormant during the rainy winter months and reach maximum LAI in April. The blue oak ecosystem rings the Great Central Valley of California, inhabiting the lower reaches of the Sierra Nevada foothills.

Tonzi Ranch样地坐落于内华达山脉（Sierra Nevada Mountains）低海拔山麓地带，其所属私有土地被归类为橡木稀树草原林地。该场地由当地牧场主拉塞尔·通齐（Russell Tonzi）管护，为满足畜牧放牧需求，定期清理灌丛。林冠层以蓝橡树为主（占总植被量的40%），间杂少量灰松（密度为3株/公顷）。林下植被涵盖多种草本植物，包括紫色假雀麦、光滑猫耳菊以及玫瑰三叶草。这两个显著的植被层相互交错分布。林下植被的生长季仅局限于湿季，通常为10月至次年5月初。与之形成对比的是，落叶蓝橡树在多雨的冬季处于休眠状态，并于4月达到最大叶面积指数（LAI）。蓝橡树生态系统环绕加利福尼亚大中央谷，分布于内华达山脉山麓的低海拔区域。