24 research outputs found

    Table1_Spatial patterns and drivers of soil total nitrogen in anthropogenic shrub encroachment in desert steppe.DOCX

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    Nitrogen is the most important driving factor in primary production and decomposition in arid and semi-arid ecosystems. The effects of shrub encroachment on nitrogen cycling have been investigated at the site scale but seldomly conducted at the landscape scale. Here, we selected 43 shrubland sites distributing across 3000 km2 area in temperate desert grassland in eastern Yanchi County of Ningxia Hui Autonomous. We investigated the spatial heterogeneity and driving factors of soil total nitrogen (STN) at the landscape scale by using geostatistical analysis and the geographical detector method. Our results showed that the average soil total nitrogen decreased in the order of 0–5 cm (0.21 g kg−1) > 5–15 cm (0.19 g kg−1) > 15–40 cm (0.18 g kg−1). Geostatistical analysis showed that soil total nitrogen exhibited the strong spatial autocorrelation in the 0–5 and 5–15 cm soil layers and the moderate spatial autocorrelation in the 15–40 cm soil layer. Furthermore, the geographic detector method indicated that soil physicochemical properties exhibited the stronger effects than these of topographic and vegetation biomass in determining the spatial distribution of soil total nitrogen. Specifically, soil water content in the 0–20 cm soil layer explained 35% of variation in soil total nitrogen spatial pattern in the 0–5 cm soil layer, while soil organic carbon content in the 15–40 cm soil layer explained 64% and 45% of variation in soil total nitrogen spatial patterns in the 5–15 cm and 15–40 cm soil layers, respectively. It was concluded that soil water content and organic carbon content primarily drove the formation of soil total nitrogen spatial heterogeneity in shrubland at the landscape scale, indicating that anthropogenic shrub encroachment evidently affected soil water content and redistribution in dryland.</p

    DataSheet1_Spatial patterns and drivers of soil total nitrogen in anthropogenic shrub encroachment in desert steppe.CSV

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    Nitrogen is the most important driving factor in primary production and decomposition in arid and semi-arid ecosystems. The effects of shrub encroachment on nitrogen cycling have been investigated at the site scale but seldomly conducted at the landscape scale. Here, we selected 43 shrubland sites distributing across 3000 km2 area in temperate desert grassland in eastern Yanchi County of Ningxia Hui Autonomous. We investigated the spatial heterogeneity and driving factors of soil total nitrogen (STN) at the landscape scale by using geostatistical analysis and the geographical detector method. Our results showed that the average soil total nitrogen decreased in the order of 0–5 cm (0.21 g kg−1) > 5–15 cm (0.19 g kg−1) > 15–40 cm (0.18 g kg−1). Geostatistical analysis showed that soil total nitrogen exhibited the strong spatial autocorrelation in the 0–5 and 5–15 cm soil layers and the moderate spatial autocorrelation in the 15–40 cm soil layer. Furthermore, the geographic detector method indicated that soil physicochemical properties exhibited the stronger effects than these of topographic and vegetation biomass in determining the spatial distribution of soil total nitrogen. Specifically, soil water content in the 0–20 cm soil layer explained 35% of variation in soil total nitrogen spatial pattern in the 0–5 cm soil layer, while soil organic carbon content in the 15–40 cm soil layer explained 64% and 45% of variation in soil total nitrogen spatial patterns in the 5–15 cm and 15–40 cm soil layers, respectively. It was concluded that soil water content and organic carbon content primarily drove the formation of soil total nitrogen spatial heterogeneity in shrubland at the landscape scale, indicating that anthropogenic shrub encroachment evidently affected soil water content and redistribution in dryland.</p

    Differentially expressed genes (DEGs) of flower buds from male sterile and male fertile plants.

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    <p>(a) DEGs between S1 (1 mm flower buds of male sterile plants) and F1(1 mm flower buds of male fertile plants); (b) DEGs between S2 (4 mm flower buds of male sterile plants) and F2 (4 mm flower buds of male fertile plants); (c) The Venn diagram showed specifically or commonly expressed DEGs in both development of flower buds. In the volcano figure, scattered dot represented each gene, blue dots indicated that the unigenes with no significant differential expression level, red dots indicated the significantly up-regulated unigenes while the green dots indicated the significantly down-regulated unigenes. In the Venn diagram, the number in the large circle represented total number of specifically expressed DEGs in 1 mm or 4 mm sized flower buds, while the number in the overlapping portion represented commonly expressed DEGs in both 1 mm and 4 mm sized flower buds.</p

    Flower buds development processes of male sterile and male fertile two-type line M525AB of <i>T</i>. <i>erecta</i>.

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    <p>(a) Developmental process of male sterile M525A’s flower buds from 0.5 mm to 8 mm in diameter; (b) Developmental process of male fertile M525B’s flower buds from 0.5 mm to 8 mm in diameter. IP: inflorescence primordium, SFP: sterile floret primordium, SF: sterile floret, SP: sepal and sepal-like petal of male sterile floret, SS: style-like stamen and stigma of male sterile floret, RFP: ray floret primordium, DFP: disc floret primordium, RF: ray floret, DF: disc floret, Se: sepal of fertile floret, Pe: petal of ray floret, St: stigma of ray floret.</p

    Floret morphology of the male sterile and male fertile two-type line M525AB of <i>T</i>. <i>erecta</i>.

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    <p>The ray florets of male sterile M525A (a-1) and male fertile M525B (b-1) had three whorls of floral organs, sepal (a-2, b-2), petal (a-3, b-3) and pistil (a-4, b-4), while the petal of ray floret in M525A developed into sepal-like structure. The disk florets of male sterile M525A (c-1) and male fertile M525B (d-1) had four whorls of floral organs, sepal (c-2, d-2), petal (c-3, d-3), stamen (c-5, d-5) and pistil (c-4, d-5). The petals of disc florets in M525A developed into sepal-like structures, while the stamens developed into yellow filaments.</p

    Scanning electron microscope observation of floret morphology of the male sterile and male fertile two-type line M525AB of <i>T</i>. <i>erecta</i>.

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    <p>The deformed petal of male sterile plant was covered by unusual pappus hairs which were typically found in sepal. The distorted stamen of male sterile plant was covered by trichomes that were only found in stigma walls. Pa: pappus hairs, Tr: trichomes.</p

    Functional classifications of the assembled unigenes according to the euKaryotic Ortholog Group categories.

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    <p>The x-axis indicated 26 groups of KOG. The y-axis indicated the percentage of the number of annotated genes under a group to the total number of annotated genes.</p
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