DATE: A handheld co-robotic device for automated tuning of emitters to enable precision irrigation

Agriculture accounts for 85% of the world's freshwater usage. Drip irrigation significantly reduces water usage and has been adopted by many farms, orchards, and vineyards. Rubber or PVC tubing is fitted with thousands of drip emitters whose water pressure and flow are controlled by a small...

Agriculture’s Contribution to Nitrate Contamination of Californian Groundwater (1945–2005)

Nitrogen (N) use in intensive agriculture can degrade groundwater resources. However, considerable time lags between groundwater recharge and extraction complicate source attribution and remedial responses. We construct a historic N mass balance of two agricultural regions of California to...

Productivity alters the scale dependence of the diversity-invasibility relationship

At small scales, areas with high native diversity are often resistant to invasion, while at large scales, areas with more native species harbor more exotic species, suggesting that different processes control the relationship between native and exotic species diversity at different spatial...

Priming the productivity pump: flood pulse driven trends in suspended algal biomass distribution across a restored floodplain

1. Chlorophyll a (Chl a) distribution across a 0.36 km2 restored floodplain (Cosumnes River, California) was analysed throughout the winter and spring flood season from January to June 2005. In addition, high temporal-resolution Chl a measurements were made in situ...

Human Impacts, Plant Invasion, and Imperiled Plant Species in California

Invasive species are one of the fastest growing conservation problems. These species homogenize the world's flora and fauna, threaten rare and endemic species, and impose large economic costs. Here, we examine the distribution of 834 of the more than 1000 exotic plant taxa that have become...

Beta diversity and the scale‐dependence of the productivity‐diversity relationship: a test in the Californian serpentine flora

  • The relationship of productivity to species diversity is usually positive at regional scales, but is often neutral, unimodal or negative at local spatial scales. Recent studies have pointed out that beta diversity, or among-locality and within-region variation in species composition, must
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Anthropogenic impacts upon plant species richness and net primary productivity in California

We assess the importance of anthropogenic land-use, altered productivity, and species invasions for observed productivity–richness relationships in California. To this end, we model net primary productivity (NPP) c. 1750 AD and at present (1982–1999) and map native and exotic vascular...

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