TABLE 1.

Land use variables used in this studya

Variable nameDescription
NU_PASNearest upstream distance to pasture (km)
NU_DEVHINearest upstream distance to commercial and nonresidential land (km)
NU_DEVLNearest upstream distance to a residential house (km)
NU_DAINearest upstream distance to a dairy farm (km)
NU_FORESTNearest upstream distance to forest observation (km)
Q1_PASFirst quartile upstream distance to pasture (km)
Q1_DAIFirst quartile upstream distance to a dairy farm (km)
L5_CROPPercent crop land coverage in subwatershed (% of land)
L5_DEVbPercent commercial and residential building coverage in watershed (% of land)
L5_FORPercent forage coverage in watershed (% of land)
L5_PASPercent pasture coverage in watershed (% of land)
L5_SHRPercent shrub land coverage in watershed (% of land)
  • a All variables are referenced spatially with respect to all sampling sites within the study area (Fig. 1).

  • b Excluding agricultural buildings.