A Natural History of California (California Natural History - download pdf or read online
By Allan A. Schoenherr
During this finished and abundantly illustrated booklet, Allan Schoenherr describes a nation with a better diversity of landforms, a greater diversity of habitats, and extra varieties of vegetation and animals than any region of similar dimension in all of North the United States. A normal heritage of California will familiarize the reader with the weather, rocks, soil, crops and animals in each one specific zone of the kingdom.
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Additional info for A Natural History of California (California Natural History Guides)
For example, an acre of corn transpires the equivalent of 11 inches (28 cm) per year. A deficiency of water therefore severely limits ecosystems. In California, 85% of the water is used by agriculture. Agriculture does best where it is sunny, but where there is abundant sunlight, it doesn't rain much. Therefore, California's agriculture depends on imported water. In the San Joaquin Valley, most of the water is supplied by groundwater pumping, which is akin to mining water. < previous page page_32 If you like this book, buy it!
It is an artificial situation created, most likely temporarily, by government-subsidized long-distance water transport systems such as < previous page page_31 If you like this book, buy it! next page > < previous page page_32 next page > Page 32 the California Aqueduct, the Colorado Aqueduct, and the All American Canal, which have enabled farmers to develop lands that are normally not suitable for growing crops. Several factors may change in the near future as Arizona continues to lay claim to its share of the Colorado River.
Humans have a tendency to cause simplification of ecosystems and thus produce unstable ecosystems. Agriculture, for example, creates a simple ecosystem that is not < previous page page_24 If you like this book, buy it! next page > < previous page page_25 next page > Page 25 only energetically inefficient because of the laws of thermodynamics, but unstable as well. Suppose a logging company clears and replants a forest. This is an example of agriculture because frequently only the economically important species is replanted.
A Natural History of California (California Natural History Guides) by Allan A. Schoenherr