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- Bennett, L.L.
- Agricultural economics 2000 v.24 no.1 pp. 113-125
- Southwestern United States, etc ; water allocation; water quality; international agreements; pollution control; Mexico; Show all 6 Subjects
- ... There is now a fairly substantial literature that addresses transboundary water allocation both at the international and interstate level. However, most of this literature deals almost exclusively with the question of allocation and ignores quality considerations. At the same time, there is a growing literature on transboundary pollution control and upstream/downstream externalities. What is missi ...
- Scott, R.L.; Shuttleworth, W.J.; Keefer, T.O.; Warrick, A.W.
- Water resources research 2000 v.36 no.8 pp. 2233
- Southwestern United States, etc ; soil water recharge; rhizosphere; roots; rangelands; soil water; soil water content; shrubs; grasses; vegetation cover; water use efficiency; winter; depth; vadose zone; algorithms; model validation; optimization; El Nino; semiarid zones; precipitation; hydrologic models; computer analysis; Arizona; Show all 23 Subjects
The multiyear, root zone soil moisture redistribution characteristics in a semiarid rangeland in southeastern Arizona were evaluated to determine the magnitude and variability of deep-profile, wintertime soil moisture recharge. Intermittent observations from 1990 to 1998 of average volumetric soil moisture under shrub and grass cover showed that significant recharge beyond 0.30 m principally occu ...
- Weltzin, Jake F.; McPherson, Guy R.
- Ecology 2000 v.81 no.7 pp. 1902-1913
- Southwestern United States, etc ; Quercus emoryi; adults; atmospheric precipitation; climate change; dry matter partitioning; ecotones; field experimentation; gas emissions; germination; grasses; grasslands; growing season; prediction; savannas; seedling emergence; seedlings; soil water; summer; trees; winter; woodlands; woody plants; Mexico; Show all 24 Subjects
- ... In contrast to documented increases in woody plant dominance of former savannas and grasslands of North America, ecotones between oak (Quercus L.) woodlands and semi‐desert grasslands of the southwestern United States and northwestern Mexico have been relatively stable over the past several centuries. Soil resource partitioning, wherein shallow‐rooted grasses use summer precipitation and deep‐root ...