降水对鄂尔多斯高原克隆植物分布的影响  

Effects of precipitation on clonal plant distribution on Ordos Plateau

作　　者：朱雅娟[1] 叶学华[2] 初玉 高树琴[2] 董鸣[2,4,5] ZHU Yajuan;YE Xuehua;CHU Yu;GAO Shuqin;DONG Ming(Institute of Desertification Studies,Chinese Academy of Forestry,Beijing 100091,China;State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China;Beijing Branch,Chinese Academy of Sciences,Beijing 100190,China;Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration,College of Life and Environment Sciences,Hangzhou Normal University,Hangzhou 310036,China;Key Laboratory of Sichuan Province for Ecological Security and Protection,Mianyang Teacher′s College,Mianyang 621000,China)

机构地区：[1]中国林业科学研究院荒漠化研究所,北京100091 [2]中国科学院植物研究所植被与环境变化国家重点实验室,北京100093 [3]中国科学院北京分院,北京100190 [4]杭州师范大学生命与环境科学学院,生态系统保护与恢复杭州市重点实验室,杭州310036 [5]绵阳师范学院,生态安全与保护四川省重点实验室,绵阳621000

出　　处：《生态学报》2020年第3期952-963,共12页Acta Ecologica Sinica

基　　金：国家重点研发计划项目专题(2017YFC050450202)

摘　　要：鄂尔多斯高原地处半干旱区到干旱区的过渡带。通过沿鄂尔多斯高原从东到西的天然降水梯度的样带调查,分析了克隆植物的分布特征与降水的关系。结果表明:克隆植物的物种数量、占物种总数的比例和重要值以及根状茎型克隆植物的物种数量均与降水量呈显著正相关。5种优势植物克氏针茅、本氏针茅、黑沙蒿、赖草和短花针茅均为克隆植物,它们的分布也受降水影响。克氏针茅的密度、本氏针茅的盖度和密度、黑沙蒿的高度、盖度和密度以及赖草的高度均与降水量呈显著正相关。然而,赖草的盖度以及短花针茅的高度、盖度和密度均与降水量成负相关。因此,克隆植物在鄂尔多斯高原植被中具有重要作用,而且其作用随着降水量的增加而加强。Ordos Plateau is located in an ecotone in a semi-arid to arid region. The distribution of clonal plants on Ordos Plateau was analyzed in relation to precipitation based on a dataset from plot and line transect sampling along a natural precipitation gradient from East to West. The results showed that clonal species number, ratio of clonal to total species number, importance value of clonal species, and the species number of rhizomatous clonal plants were significantly positively related to precipitation(P<0.05). Five dominant plants were all clonal, including Stipa krylovii, S. bungeana, Artemisia ordosica, Leymus secalinus, and S. breviflora. Their distribution was also affected by precipitation. The density of S. krylovii;coverage and density of S. bungeana;height, coverage, and density of A. ordosica;and height of L. secalinus were all significantly positively related to precipitation(P<0.05). However, the coverage of L. secalinus and height, coverage, and density of S. breviflora were negatively related to precipitation(P<0.05). Therefore, in the vegetation on Ordos Plateau, clonal plants had a relatively high importance value, which increased with increasing precipitation.

关 键 词：降水 克隆植物 根状茎型克隆植物 克氏针茅 本氏针茅 黑沙蒿 赖草 

分 类 号：Q948[生物学—植物学]