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Analysis of water consumption of artificial sand-fixing plants and simulation of ecological moisture fitness

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The theory and simulation of niche fitness of plant species has led to a quantitative study of the niche on the distribution regularity following limited spatial-temporal precipitation. The theory examines the constraints to plants in arid regions and the relationship between precipitation and water consumption of sand-fixing plants. The degree of ecological moisture fitness of sand-fixing plants was analyzed quantitatively and the method of simulating moisture fitness degree was established. The relative computation analysis and numerical simulation were completed on the basis of experimental data. The results showed that the values of ecological moisture fitness in different experimental conditions change as a parabola, and the maximum value appears at the annual precipitation peak stage. With increasing plant densities in Caragana korshiskii (CK) or Artemisia ordosica (AO) monoculture, the value of the degree of ecological fitness decreased. The ecological fitness degree is greater in monoculture when the coverage is higher. The evapotranspiration of CK or AO in interplanted CK and AO was less than that of CK or AO monocultures. The root depth and width of AO were also less than in the monocultures. The value of ecological moisture fitness degree decreased in interplanted plants compared with that of monocultures. The root depth of CK was longer, the root width was also smaller, and the value of ecological moisture fitness degree increased in inter-planted plants as compared with those in monoculture. It is possible to use soil moisture in deep layers for CK. Therefore, interplanting is the best method of planting under experimental conditions. The percentage of vegetation coverage could reach the maximum (25.4%) when interplanting CK and AO at a density of 5000 plants per hectare, and this provides a quantitative basis for artificial planting in arid regions. In addition, the competition between CK and AO in sandy soil for water under conditions of soil moisture and precipitation are discussed. The variation of moisture fitness degree in interplanting and the mechanism of generating the stable coexistence pattern are also discussed.

Affiliations: 1: The State Key Laboratory of Arid Agroecology, Lanzhou University ; 2: The State Key Laboratory of Arid Agroecology, Lanzhou University ; 3: Department of Biology, Shaoxing College of Arts and Sciences


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