{"title":"[中国内蒙古灌木侵蚀草地 Caragana microphylla 的种群特征及其土壤影响因素]。","authors":"Yi-Yao Wen, Jiang Zhu, Huan Wang, Meng-di Zhang, Shun-Bao Lu, Shu-Xia Zheng","doi":"10.13287/j.1001-9332.202406.001","DOIUrl":null,"url":null,"abstract":"<p><p>We studied the population characteristics of <i>Caragana microphylla</i> and related soil factors across diffe-rent stages of shrub encroachment (<i>i.e</i>., light, moderate, and severe) on the Xilingol Grassland of Inner Mongolia. The results showed that the density and height of <i>C. microphylla</i> gradually increased during the process of grassland shrub-encroachment from light to moderate to severe. The density and height were increased by 196.0% and 34.5% from light to moderate stage of shrub encroachment, and were increased by 25.4% and 17.6% from moderate to severe stage. Crown size, basal diameter, tiller number per clump, and aboveground productivity of <i>C. microphylla</i> tented to decrease first and then increase, while the proportion of aboveground biomass allocation to leaves decreased across the stages of shrub encroachment. The competition between <i>C. microphylla and</i> herbaceous species was strongest in the moderate encroachment stage. <i>C. microphylla</i> reduced its lateral growth (such as crown size, basal diameter, and tiller number per clump) and increased density and height to get competitive advantage. Limi-ting soil factors for <i>C. microphylla</i> varied significantly at different stages of shrub encroachment. In the light encroachment stage, soil factors had little effect on the growth of <i>C. microphylla</i>. In the moderate encroachment stage, soil moisture in the deep layer (20-50 cm) and soil pH were the key factors limiting shrub density. In the severe encroachment stage, soil moisture in the deep layer and pH limited the vertical growth of <i>C. microphylla</i>, while soil moisture of shallow layer (0-20 cm) and nutrients were the limiting factors for the lateral expansion of shrubs.</p>","PeriodicalId":35942,"journal":{"name":"应用生态学报","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"[Population characteristics of <i>Caragana microphylla</i> and the influencing soil factors in shrub-encroached grassland of Inner Mongolia, China].\",\"authors\":\"Yi-Yao Wen, Jiang Zhu, Huan Wang, Meng-di Zhang, Shun-Bao Lu, Shu-Xia Zheng\",\"doi\":\"10.13287/j.1001-9332.202406.001\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>We studied the population characteristics of <i>Caragana microphylla</i> and related soil factors across diffe-rent stages of shrub encroachment (<i>i.e</i>., light, moderate, and severe) on the Xilingol Grassland of Inner Mongolia. The results showed that the density and height of <i>C. microphylla</i> gradually increased during the process of grassland shrub-encroachment from light to moderate to severe. The density and height were increased by 196.0% and 34.5% from light to moderate stage of shrub encroachment, and were increased by 25.4% and 17.6% from moderate to severe stage. Crown size, basal diameter, tiller number per clump, and aboveground productivity of <i>C. microphylla</i> tented to decrease first and then increase, while the proportion of aboveground biomass allocation to leaves decreased across the stages of shrub encroachment. The competition between <i>C. microphylla and</i> herbaceous species was strongest in the moderate encroachment stage. <i>C. microphylla</i> reduced its lateral growth (such as crown size, basal diameter, and tiller number per clump) and increased density and height to get competitive advantage. Limi-ting soil factors for <i>C. microphylla</i> varied significantly at different stages of shrub encroachment. In the light encroachment stage, soil factors had little effect on the growth of <i>C. microphylla</i>. In the moderate encroachment stage, soil moisture in the deep layer (20-50 cm) and soil pH were the key factors limiting shrub density. In the severe encroachment stage, soil moisture in the deep layer and pH limited the vertical growth of <i>C. microphylla</i>, while soil moisture of shallow layer (0-20 cm) and nutrients were the limiting factors for the lateral expansion of shrubs.</p>\",\"PeriodicalId\":35942,\"journal\":{\"name\":\"应用生态学报\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"应用生态学报\",\"FirstCategoryId\":\"1087\",\"ListUrlMain\":\"https://doi.org/10.13287/j.1001-9332.202406.001\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"Environmental Science\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"应用生态学报","FirstCategoryId":"1087","ListUrlMain":"https://doi.org/10.13287/j.1001-9332.202406.001","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"Environmental Science","Score":null,"Total":0}
引用次数: 0
摘要
我们研究了内蒙古锡林郭勒草原在不同灌木侵占阶段(即轻度、中度和重度)小穗花荠的种群特征及相关土壤因子。结果表明,在草原灌木蚕食由轻度到中度再到重度的过程中,小冠花的密度和高度逐渐增加。从灌木蚕食轻度到中度,密度和高度分别增加了196.0%和34.5%;从中度到重度,密度和高度分别增加了25.4%和17.6%。在灌木侵占的各个阶段,小花杉的树冠大小、基部直径、每丛分蘖数和地上生产力先减小后增大,而叶片的地上生物量分配比例则有所下降。在中度侵占阶段,小花杉与草本物种之间的竞争最为激烈。为了获得竞争优势,C. microphylla 减少了侧向生长(如树冠大小、基部直径和每丛分蘖数),增加了密度和高度。在灌木蚕食的不同阶段,小花翠菊的土壤限制因子有显著差异。在轻度侵占阶段,土壤因子对 C. microphylla 的生长影响不大。在中度侵占阶段,深层土壤水分(20-50 厘米)和土壤 pH 值是限制灌木密度的关键因素。在严重侵占阶段,深层土壤水分和 pH 值限制了 C. microphylla 的垂直生长,而浅层土壤水分(0-20 厘米)和养分是限制灌木横向扩展的因素。
[Population characteristics of Caragana microphylla and the influencing soil factors in shrub-encroached grassland of Inner Mongolia, China].
We studied the population characteristics of Caragana microphylla and related soil factors across diffe-rent stages of shrub encroachment (i.e., light, moderate, and severe) on the Xilingol Grassland of Inner Mongolia. The results showed that the density and height of C. microphylla gradually increased during the process of grassland shrub-encroachment from light to moderate to severe. The density and height were increased by 196.0% and 34.5% from light to moderate stage of shrub encroachment, and were increased by 25.4% and 17.6% from moderate to severe stage. Crown size, basal diameter, tiller number per clump, and aboveground productivity of C. microphylla tented to decrease first and then increase, while the proportion of aboveground biomass allocation to leaves decreased across the stages of shrub encroachment. The competition between C. microphylla and herbaceous species was strongest in the moderate encroachment stage. C. microphylla reduced its lateral growth (such as crown size, basal diameter, and tiller number per clump) and increased density and height to get competitive advantage. Limi-ting soil factors for C. microphylla varied significantly at different stages of shrub encroachment. In the light encroachment stage, soil factors had little effect on the growth of C. microphylla. In the moderate encroachment stage, soil moisture in the deep layer (20-50 cm) and soil pH were the key factors limiting shrub density. In the severe encroachment stage, soil moisture in the deep layer and pH limited the vertical growth of C. microphylla, while soil moisture of shallow layer (0-20 cm) and nutrients were the limiting factors for the lateral expansion of shrubs.