放牧强度对无芒隐子草空间分布的多重分形结构影响  

The effect of grazing intensity on the multifractal structure of the spatial distribution of Cleistogenes songorica

作　　者：韩朝炜 宝音贺希格[2] HAN Chaowei;Baoyinhexige(Department of Plant Sciences,College of Agricultural and Bioresources,Saskatoon,S7N5A8,Canada;Comprehensive Demonstration Center,Inner Mongolia Academy of Agriculture and Animal Husbandry,Hohhot 010031,Inner Mongolia,China)

机构地区：[1]萨斯喀彻温大学植物科学系,加拿大萨斯卡通S7N5A8 [2]内蒙古农牧业科学院综合实验示范中心,内蒙古呼和浩特010031

出　　处：《草业科学》2021年第7期1231-1239,共9页Pratacultural Science

基　　金：国家自然科学基金(31760129)。

摘　　要：以内蒙古高原短花针茅(Stipa breviflora)荒漠草原为研究对象,设置不放牧(对照区,CK)、轻度放牧(LG)、中度放牧(MG)和重度放牧(HG)4个放牧强度处理,分析丛生类禾草空间分布状态及其对放牧强度的响应。结果表明,随着放牧强度增加,无芒隐子草(Cleistogenes songorica)空间分布的多重分形度逐渐增大。无芒隐子草空间分布多重分形特征在CK处理下最为复杂,随放牧强度增加,空间分布的多重分形特征复杂程度增加,但均小于CK处理。无芒隐子草空间分布的均匀度在LG和MG处理下较大。CK处理下无芒隐子草空间分布的复杂性主要由母株株丛繁殖能力、扩散能力和群落中种群竞争决定,HG处理下无芒隐子草空间分布的复杂性由放牧家畜选择性采食、随机游走践踏和种群本身的耐受能力决定。An experiment was conducted in the Stipa breviflora desert steppe on the Inner Mongolian Plateau with four grazing intensity treatments:control with no grazing(CK),light grazing(LG),moderate grazing(MG),and heavy grazing(HG).The multifractal degree of the Cleistogenes songorica spatial distribution increased with the increase in grazing intensity,and the multifractal characteristics of C.songorica were the most complex in CK.The complexity of the multifractal characteristics increased with increasing grazing intensity across the LG,MG,and HG treatments,but were less complex than those in CK.In the LG and MG treatments,the evenness of the C.songorica spatial distribution was larger than that of the other treatments.In the CK treatment,the complexity of the C.songorica spatial distribution was mainly determined by the propagation,dispersal,and competitiveness of the mother tillers in the plant community.The complexity of the C.songorica spatial distribution was mainly determined by selective foraging due to sheep grazing,tramping by sheep movement,and plant tolerance to grazing.

关 键 词：荒漠草原 优势种群 单因素随机区组设计 统计阶距 广义维数谱 奇异性指数 多重分形奇异谱 

分 类 号：S812[农业科学—草业科学]