荒漠草原主要植物种间关系对降水年型变化的响应
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引用本文:刘菊红,张 军,吕世杰,王忠武,韩国栋.荒漠草原主要植物种间关系对降水年型变化的响应[J].西北植物学报,2019,39(7):1289~1297
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作者单位
刘菊红1,2,张 军1,2,吕世杰1,2,王忠武1,韩国栋1* (1 内蒙古农业大学 草原与资源环境学院呼和浩特 0100192 内蒙古农业大学 理学院呼和浩特 010018) 
基金项目:内蒙古自治区自然科学基金(2017MS0120,2017MS0122);
中文摘要:该研究采用内蒙古短花针茅荒漠草原长期试验平台2004~2015年期间不同降水年型(丰水、平水、欠水)下的植被数据,分析研究区7个主要植物21个种对的种间关系及其对降水年型的响应;应用方差比率法确定物种间的总体联结性,基于χ2检验测定种对间的联结性,采用联结系数AC判断种对间联结的正负,运用共同出现百分率PC、Ochiai指数、Dice指数分析种对相伴出现的几率,以明确荒漠草原主要物种间的关系,揭示降水对种群间相互作用的影响机制。结果表明:(1) 样方内的平均物种数在平水年达到最大,主要物种的总体联结性在丰水年呈显著正相关、平水年呈不显著正相关、欠水年呈不显著负相关,表明年降水量的下降致使种对间的关系由共存为主转变为竞争为主。(2) 降水年型的变化使部分种对间的联结性发生改变,丰水年正联结的种对占57.1%,平水年降至52.4%,欠水年降至33.3%,也表明干旱胁迫导致协同共存的种对数减少,相互竞争的种对数增加。(3) 降水年型的变化主要影响狭叶锦鸡儿与其他物种的共同出现几率,并以平水年最大,而对其他种对间的正相互作用无影响。
中文关键词:荒漠草原  降水年型  种间关系  竞争  共存
 
Response of Interspecific Relationships among Main Plant Species to the Change of Precipitation Years in Desert Steppe
Abstract:In this study, vegetation data in different precipitation years (rainy years, normal years and dry years) were adopted from the long term experimental platform of Stipa breviflora desert steppe in Inner Mongolia from 2004 to 2015. Interspecific relationships among 7 major plant species (21 pairs) and their response to the change of precipitation years were studied. The overall association among species was measured by variance ratio. Based on χ2 test, pair species association was measured. Association coefficient (AC) was calculated to confirm positive or negative associations. Percentage of co occurrence (PC), Ochiai index (OI), Dice index (DI) were calculated to analyse the probability of pair species concomitant occurrence. The aim is to clarify the relationship between the main species in the desert steppe and reveal the mechanism of the influence of precipitation on the interaction between the populations. The results are as follows: (1) the average of species number in sample plots reached the maximum in normal years. The overall association among species was significantly positive in rainy years. It was not significant positive in normal years and not significant negative in dry years. The result showed that the decrease of annual precipitation changed the relationship of main species from coexistence to competition. (2) The change of precipitation years changed some of pair species associations. The species pairs with positive association in rainy years accounted for 57.1%. It fell to 52.4% in normal years and 33.3% in dry years. It showed that drought stress led to the decreasing of coexistence pairs and the increasing of competition pairs. (3) The change of precipitation years mainly affected the percentage of co occurrence of Caragana stenophylla and other species. It was the largest in normal years. There was no effect on the positive interaction among the other pairs.
keywords:desert steppe  precipitation years  interspecific relationships  competition  coexistence
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