{"title":"邻近灌木繁殖体和灌木丛土壤对阿根廷巴塔哥尼亚蒙特干旱牧场多年生牧草发芽的影响","authors":"Giovana Magali Muñoz, Analía Lorena Carrera, Mónica Beatriz Bertiller, Hebe Saraví Cisneros","doi":"10.1111/jvs.13257","DOIUrl":null,"url":null,"abstract":"<div>\n \n \n <section>\n \n <h3> Question</h3>\n \n <p>Do shrubs negatively affect the germination of perennial grass species in regeneration microsites? We experimentally analyzed the effect of soils from plant patches dominated by two shrub species (<i>Larrea divaricata</i> and <i>Schinus johnstonii</i>) and their propagules on the germination of three co-dominant herbivore-preferred perennial grass species (<i>Poa ligularis</i>, <i>Nassella tenuis</i> and <i>Pappostipa speciosa</i>).</p>\n </section>\n \n <section>\n \n <h3> Location</h3>\n \n <p>Patagonian Monte, Chubut Province, Argentina (42°07′ S, 64°59′ W; 43°06′ S, 65°43′ W; 42°29′ S, 66°34′ W).</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>We conducted two simultaneous microcosm experiments. In the first experiment, we sowed perennial grass propagules of the three species alone and combined with non-scarified shrub propagules in Petri dishes with three substrate types (filter paper, inert soil and soil from shrub patches). In the second experiment, we sowed perennial grass propagules of each species combined with scarified and non-scarified propagules of both shrub species in Petri dishes with soil taken from plant patches dominated by <i>L. divaricata</i> and by <i>S. johnstonii</i>. Both experiments lasted 3 months. We calculated the germination proportion and mean germination time (MGT) of propagules for each perennial grass species in each treatment.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>Propagules from neighboring shrubs had a clearer negative effect on grass germination compared with shrub soils. Shrub propagules negatively affected the germination proportion of <i>P. ligularis</i> and <i>N. tenuis</i>, and induced longer MGT in the three perennial grass species. The combination of <i>S. johnstonii</i> soil and propagules negatively affected <i>P. ligularis</i> and <i>P. speciosa</i> germination. The combination of <i>L. divaricata</i> soil and scarified propagules completely inhibited <i>P. speciosa</i> germination.</p>\n </section>\n \n <section>\n \n <h3> Conclusions</h3>\n \n <p>Our results highlighted the complexity of interactions between shrubs with high phenolic contents (soils and propagules) and the germination of perennial grass species in arid environments. <i>Schinus johnstonii</i> soil and propagules had stronger effects on perennial grass germination than <i>L. divaricata</i> soil and propagules. The negative effects of shrubs on microsite quality and germination processes depended on the specific shrub/grass interaction.</p>\n </section>\n </div>","PeriodicalId":49965,"journal":{"name":"Journal of Vegetation Science","volume":"35 3","pages":""},"PeriodicalIF":2.2000,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of neighbor shrub propagules and soils from shrubby patches on perennial grass germination in arid rangelands of the Patagonia Monte, Argentina\",\"authors\":\"Giovana Magali Muñoz, Analía Lorena Carrera, Mónica Beatriz Bertiller, Hebe Saraví Cisneros\",\"doi\":\"10.1111/jvs.13257\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n \\n <section>\\n \\n <h3> Question</h3>\\n \\n <p>Do shrubs negatively affect the germination of perennial grass species in regeneration microsites? We experimentally analyzed the effect of soils from plant patches dominated by two shrub species (<i>Larrea divaricata</i> and <i>Schinus johnstonii</i>) and their propagules on the germination of three co-dominant herbivore-preferred perennial grass species (<i>Poa ligularis</i>, <i>Nassella tenuis</i> and <i>Pappostipa speciosa</i>).</p>\\n </section>\\n \\n <section>\\n \\n <h3> Location</h3>\\n \\n <p>Patagonian Monte, Chubut Province, Argentina (42°07′ S, 64°59′ W; 43°06′ S, 65°43′ W; 42°29′ S, 66°34′ W).</p>\\n </section>\\n \\n <section>\\n \\n <h3> Methods</h3>\\n \\n <p>We conducted two simultaneous microcosm experiments. In the first experiment, we sowed perennial grass propagules of the three species alone and combined with non-scarified shrub propagules in Petri dishes with three substrate types (filter paper, inert soil and soil from shrub patches). In the second experiment, we sowed perennial grass propagules of each species combined with scarified and non-scarified propagules of both shrub species in Petri dishes with soil taken from plant patches dominated by <i>L. divaricata</i> and by <i>S. johnstonii</i>. Both experiments lasted 3 months. We calculated the germination proportion and mean germination time (MGT) of propagules for each perennial grass species in each treatment.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Results</h3>\\n \\n <p>Propagules from neighboring shrubs had a clearer negative effect on grass germination compared with shrub soils. Shrub propagules negatively affected the germination proportion of <i>P. ligularis</i> and <i>N. tenuis</i>, and induced longer MGT in the three perennial grass species. The combination of <i>S. johnstonii</i> soil and propagules negatively affected <i>P. ligularis</i> and <i>P. speciosa</i> germination. The combination of <i>L. divaricata</i> soil and scarified propagules completely inhibited <i>P. speciosa</i> germination.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Conclusions</h3>\\n \\n <p>Our results highlighted the complexity of interactions between shrubs with high phenolic contents (soils and propagules) and the germination of perennial grass species in arid environments. <i>Schinus johnstonii</i> soil and propagules had stronger effects on perennial grass germination than <i>L. divaricata</i> soil and propagules. The negative effects of shrubs on microsite quality and germination processes depended on the specific shrub/grass interaction.</p>\\n </section>\\n </div>\",\"PeriodicalId\":49965,\"journal\":{\"name\":\"Journal of Vegetation Science\",\"volume\":\"35 3\",\"pages\":\"\"},\"PeriodicalIF\":2.2000,\"publicationDate\":\"2024-05-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Vegetation Science\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1111/jvs.13257\",\"RegionNum\":3,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ECOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Vegetation Science","FirstCategoryId":"93","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/jvs.13257","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ECOLOGY","Score":null,"Total":0}
引用次数: 0
摘要
灌木是否会对多年生草种在再生微地中的发芽产生负面影响？我们通过实验分析了以两种灌木（Larrea divaricata 和 Schinus johnstonii）为主的植物斑块的土壤及其繁殖体对三种食草动物偏好的多年生草种（Poa ligularis、Nassella tenuis 和 Pappostipa speciosa）发芽的影响。阿根廷丘布特省巴塔哥尼亚山（南纬 42°07′，西经 64°59′；南纬 43°06′，西经 65°43′；南纬 42°29′，西经 66°34′）。在第一个实验中，我们将三个物种的多年生禾本科繁殖体单独播种，并将其与无痕化的灌木繁殖体混合播种在装有三种基质（滤纸、惰性土壤和灌木斑块土壤）的培养皿中。在第二个实验中，我们在培养皿中播种了每个物种的多年生草繁殖体，同时还播种了两个灌木物种的痕化繁殖体和非痕化繁殖体，培养皿中的土壤取自以 L. divaricata 和 S. johnstonii 为主的植物斑块。两个实验都持续了 3 个月。与灌木土壤相比，邻近灌木的繁殖体对草地发芽的负面影响更为明显。灌木繁殖体对 P. ligularis 和 N. tenuis 的发芽率有负面影响，并导致三种多年生草种的 MGT 延长。S. johnstonii 土壤和繁殖体的组合对 P. ligularis 和 P. speciosa 的发芽有负面影响。我们的研究结果突显了酚含量高的灌木（土壤和繁殖体）与干旱环境中多年生禾本科植物发芽之间相互作用的复杂性。Schinus johnstonii的土壤和繁殖体比L. divaricata的土壤和繁殖体对多年生禾本科植物发芽的影响更大。灌木对微地质量和发芽过程的负面影响取决于灌木与草的具体相互作用。
Effects of neighbor shrub propagules and soils from shrubby patches on perennial grass germination in arid rangelands of the Patagonia Monte, Argentina
Question
Do shrubs negatively affect the germination of perennial grass species in regeneration microsites? We experimentally analyzed the effect of soils from plant patches dominated by two shrub species (Larrea divaricata and Schinus johnstonii) and their propagules on the germination of three co-dominant herbivore-preferred perennial grass species (Poa ligularis, Nassella tenuis and Pappostipa speciosa).
We conducted two simultaneous microcosm experiments. In the first experiment, we sowed perennial grass propagules of the three species alone and combined with non-scarified shrub propagules in Petri dishes with three substrate types (filter paper, inert soil and soil from shrub patches). In the second experiment, we sowed perennial grass propagules of each species combined with scarified and non-scarified propagules of both shrub species in Petri dishes with soil taken from plant patches dominated by L. divaricata and by S. johnstonii. Both experiments lasted 3 months. We calculated the germination proportion and mean germination time (MGT) of propagules for each perennial grass species in each treatment.
Results
Propagules from neighboring shrubs had a clearer negative effect on grass germination compared with shrub soils. Shrub propagules negatively affected the germination proportion of P. ligularis and N. tenuis, and induced longer MGT in the three perennial grass species. The combination of S. johnstonii soil and propagules negatively affected P. ligularis and P. speciosa germination. The combination of L. divaricata soil and scarified propagules completely inhibited P. speciosa germination.
Conclusions
Our results highlighted the complexity of interactions between shrubs with high phenolic contents (soils and propagules) and the germination of perennial grass species in arid environments. Schinus johnstonii soil and propagules had stronger effects on perennial grass germination than L. divaricata soil and propagules. The negative effects of shrubs on microsite quality and germination processes depended on the specific shrub/grass interaction.
期刊介绍：
The Journal of Vegetation Science publishes papers on all aspects of plant community ecology, with particular emphasis on papers that develop new concepts or methods, test theory, identify general patterns, or that are otherwise likely to interest a broad international readership. Papers may focus on any aspect of vegetation science, e.g. community structure (including community assembly and plant functional types), biodiversity (including species richness and composition), spatial patterns (including plant geography and landscape ecology), temporal changes (including demography, community dynamics and palaeoecology) and processes (including ecophysiology), provided the focus is on increasing our understanding of plant communities. The Journal publishes papers on the ecology of a single species only if it plays a key role in structuring plant communities. Papers that apply ecological concepts, theories and methods to the vegetation management, conservation and restoration, and papers on vegetation survey should be directed to our associate journal, Applied Vegetation Science journal.
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