Evaluation of the establishment of the sámota bush (Coursetia glandulosa A. Gray) from seeds, under different conditions in degraded arid land of Hermosillo, Sonora, México
DOI:
https://doi.org/10.18387/polibotanica.59.8Keywords:
Desertification, Livestock, Ranch management, Ecological successionAbstract
The objective of this work was to evaluate the effect of germination, survival, and growth of the first year, of the native forage shrub Coursetia glandulosa, from seeds sown in different conditions of degraded land and as a control in agricultural soil with drip irrigation in Hermosillo, Sonora, Mexico. 100 seeds were established in each patch of degraded soil: bare, bare soil adding pruning branches, under tree, and with protective plastic mesh, only at the expense of precipitation, in addition to control treatment patches in agricultural ecosystem where irrigation was applied. drip. The results after one year show that the highest germination was in the control treatment with irrigation and in the bare soil patches with mesh protection (44% and 40% germination respectively, χ² = 76.34, p = 0.0032). The one-year survival was higher in the agricultural ecosystem with 86.36% (χ² = 41.02, p = 0.0001) followed by 50% in the bare soil protected with mesh and 20% in the bare soil covered with branches, there was no one-year survival of the plants that were born under a tree and on bare soil. Plant growth was greater in the control treatment under irrigation, both in height and width of the leaf canopy, exceeding 150 cm and 145 cm respectively per year (p < 0.0001), while in the degraded ecosystem both with meshes as with branches the growths were less than 42 cm high and 10 cm wide. The establishment of C. glandulosa in arid degraded lands in northwest Mexico is far below its potential, limited by soil water availability and herbivory.
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