Spatial pattern of typical annual herbaceous species under planted Haloxylon ammodendron forest in a desert-oasis ecotone
Received date: 2024-07-15
Revised date: 2024-09-27
Online published: 2025-03-26
As a key taxon under the plantations in a desert-oasis ecotone, analyzing the spatial pattern of annual herbaceous species can help to reveal the structural characteristics of the community, and gain a deeper understanding of their ecological processes, intra and inter specific relationships, and Mechanism of environmental adaptation. In this study, we took three typical annual herbaceous species of the Agriophyllum squarrosum, Bassia dasyphylla and Halogeton arachnoideus under different plantation ages (5, 10, 20, 30 and 40 a) in a desert-oasis ecotone of the Hexi Corridor as the research objects, and analyzed the spatial pattern of the populations by point pattern analysis. The results showed that: (1) With the increase of the plantation ages of Haloxylon ammodendron plantations, the dominant species of annual herbaceous species under the plantation changed, from the 5-year-old community of Agriophyllum squarrosum-Bassia dasyphylla to the community of Bassia dasyphylla-Halogeton arachnoideus at 40 years. (2) With the increase of the plantation ages, the initial aggregation distribution of Agriophyllum squarrosum changed to random distribution. The initial aggregation distribution of Bassia dasyphylla changed from the initial aggregation distribution to the random distribution, and then from the random distribution to the aggregation distribution. The aggregation distribution of Halogeton arachnoideus changed from local scale to large-scale aggregation distribution. The uncorrelated scale of Agriophyllum squarrosum and Bassia dasyphylla gradually expanded with the increase of plantation ages, while the scale of the positive correlation between Bassia dasyphylla and Halogeton arachnoideus expanded. There was no spatial correlation between Agriophyllum squarrosum and Halogeton arachnoideus at all time and scales. (3) With the increase of plantation ages, the soil water content increased significantly, and the soil total nitrogen content decreased first and then increased, reaching the maximum value at 40 year-old. When the soil pH decreased, the electrical conductivity, Na+ and Ca2+ content changed consistently, and all of them increased significantly after 30 year-old. (4) In addition to the characteristics of annual herbaceous species, the environmental factors were mainly affected by the soil water content (2~5 cm), Ca2+ and Na+, and were also restricted by the spatial correlation between different herbaceous plants. In general, the annual herbaceous species in a desert-oasis ecotone were mainly aggregated, and different populations were independent or mutually promoted.
Jiaqi Wang , Guohua Wang , Qianqian Gou . Spatial pattern of typical annual herbaceous species under planted Haloxylon ammodendron forest in a desert-oasis ecotone[J]. Journal of Desert Research, 2025 , 45(2) : 83 -96 . DOI: 10.7522/j.issn.1000-694X.2024.00091
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