Nurse plants are trees that serve as protection to smaller plants. Xeric environments can experience extreme high temperatures and extreme low temperatures. In these environments, nurse plants provide shaded microhabitats for the survival of several other plant species. In the Sonoran Desert, nurse plants canopies provide reduced summer daytime temperatures, soil surface temperatures, and direct sunlight, higher soil fertility, protection from the wind and browsing animals, reduced evapotranspiration rates in the nursed species, elevated nighttime temperatures, and post-fire resprouting in some species... This means that nurse plants provide a positive interaction between itself and the organisms in which it protects, and are often crucial in maintaining biodiversity in water-scarce enviro
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| - Nurse plants are trees that serve as protection to smaller plants. Xeric environments can experience extreme high temperatures and extreme low temperatures. In these environments, nurse plants provide shaded microhabitats for the survival of several other plant species. In the Sonoran Desert, nurse plants canopies provide reduced summer daytime temperatures, soil surface temperatures, and direct sunlight, higher soil fertility, protection from the wind and browsing animals, reduced evapotranspiration rates in the nursed species, elevated nighttime temperatures, and post-fire resprouting in some species... This means that nurse plants provide a positive interaction between itself and the organisms in which it protects, and are often crucial in maintaining biodiversity in water-scarce enviro (en)
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| - Nurse plants are trees that serve as protection to smaller plants. Xeric environments can experience extreme high temperatures and extreme low temperatures. In these environments, nurse plants provide shaded microhabitats for the survival of several other plant species. In the Sonoran Desert, nurse plants canopies provide reduced summer daytime temperatures, soil surface temperatures, and direct sunlight, higher soil fertility, protection from the wind and browsing animals, reduced evapotranspiration rates in the nursed species, elevated nighttime temperatures, and post-fire resprouting in some species... This means that nurse plants provide a positive interaction between itself and the organisms in which it protects, and are often crucial in maintaining biodiversity in water-scarce environments. Additionally, nurse plants aid with recovery after herbivore grazing, because they provide higher levels of resources to the plant. The effect of nurse plants on any particular species is dependent upon species richness and the dispersal strategy of the organism. Nurse plants can help with seedling recruitment and protect plants from granivory. A saguaro's root system is restricted to 15 cm of soil surface and the Palo Verde's (Cercidium microphyllum) roots go deeper under the surface. Studies suggest that a saguaro's network of roots intercept moisture before it can reach a Palo Verde's roots. When analyzing the contributions of Nurse trees, the prevention of herbivory is reduced in arid environments because the herbivores are at a much lower density, so the contribution of herbivore defense is excluded from arid environments. Nurse plants also have better soil under their canopies than what is out in the open. “Soil properties under nurse plants were always better than outside them, which are in concordance with the generalized existence of fertility islands in high mountains" Palo Verde (Cercidium spp.), mesquite (Prosopis spp.), and ironwood (Olneya tesota) trees all provide positive interactions among other plants species like facilitating seedling survival and germination. The richness and abundance of many plant species is greater under the canopies of these trees than in surrounding areas The density of plant species that depend on nurse plants depends on the number of nurse plants in a community. For example, the density of the senita cactus (Pachycereus schottii) was higher when there was a higher density of nurse plants. But the study by Holland et al., found that “there was not a significant main factor effect of nurse plants on the germination and seedling recruitment of senita cacti.” The positive effects of nurse plants with this plant species depended on rainfall (en)
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