INTERACTIONS OF WATER AND NITROGEN ON PRIMARY PRODUCTIVITY ACROSS SPATIAL AND TEMPORAL SCALES IN GRASSLAND AND SHRUBLAND ECOSYSTEMS
作者： Howard E. EPSTEIN , José M. PARUELO , Gervasio PIÑEIRO , Ingrid C. BURKE , William K. LAUENROTH3
关键词: Precipitation 、 Primary production 、 Shrubland 、 Grassland 、 Steppe 、 Ecosystem 、 Environmental science 、 Ecology 、 Nitrogen cycle 、 Temporal scales
摘要: Soil moisture, and hence precipitation, exerts a dominant control on net primary productivity (NPP; the rate of carbon accumulation by autotrophs) in semiarid to subhumid ecosystems, such as grasslands shrublands. At global scale, mean annual precipitation has been shown account for >50% variance aboveground production (ANPP) grassland ecosystems (Lauenroth 1979; Le Houerou et al. 1988). Within specific regions, numerous investigators have demonstrated strong positive relationships between (MAP) (or some surrogate variable) various globally, including Great Plains (Sala 1988; Knapp 2001; Epstein 2002), Patagonian steppe (Austin Sala 2002; Jobbagy African savannas (Breman de Wit 1983; McNaughton 1993; Scanlon shrublands Inner Mongolia northeastern China (Gao Yu 1998; 2004).
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