| 释义 |
standing cropnoun1A growing crop, especially of a cereal: we have to avoid livestock and standing crops...- Ridges are usually reformed yearly by cultivation of the standing crop in June.
- Before tax was levied on the harvested crop, the land was surveyed and the standing crop was measured.
- Crop circles are areas of standing crops that have been flattened in the shape of a circle, or more complex designs
2 Ecology The total biomass of an ecosystem or any of its components at a given time: the low standing crop of phytoplankton in oceanic areas...- The early downward drift of carbon dioxide levels may be explained as the gradual accumulation of a standing crop of plant biomass in and around fresh waters and tidal regions.
- Importance of grazing as a cause of spatial variation in food abundance is further supported by substantially greater removal of vegetation by geese in areas with lowest standing crops.
- Low water temperatures in early spring also result in lower standing crops of macro-invertebrates in prairie wetlands than after conditions become more moderate.
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