摘要
为探究塔里木河下游植物群落空间分布及其影响因素,以实地调查的36个样地及植物种的重要值,运用双向指示种分析方法(TWINSPAN)对植物群落数量进行分类,通过除趋势对应分析法(DCA)、典范对应分析法(CCA)、除趋势典范对应分析法(DCCA)分析植物群落分布与影响因素关系。结果表明:①在所调查的所有样地中,多枝柽柳出现的频度最高,占总样地数的86.11%;其次是胡杨,占总样地数的41.67%;扁蓄、盐穗木、囊果薹草、薄翅猪毛菜、地肤出现频度最低,均占样地总数的2.78%。②TWINSPAN等级分类将塔里木河下游所有样点划分为9种植物群丛,其空间分布规律表现为,离河50 m范围内主要分布着以乔木植物胡杨、灌木植物多枝柽柳、草本植物芦苇为优势种的群丛;离河150—500 m范围内主要分布着以乔木植物胡杨和灌木植物骆驼刺、铃铛刺、多枝柽柳及草本植物芦苇为优势种的群丛;离河500—1050 m范围内,主要分布着以乔木植物胡杨或灌木多枝柽柳为优势种的群丛。③CCA、DCCA两种排序结果的前2轴对环境因素的累计解释率均大于50%,各因素解释率及显著性分析结果表明总盐、地下水埋深对植物群落空间分布影响较大。因此,影响塔里木河下游植物群落空间分布的主要因素是总盐,其次是地下水埋深。塔里木河下游植物群落空间分布及影响因素分析对于揭示塔里木河下生植物群落数量特征和植被保护及生态修复具有重要的意义。
In order to explore the spatial distribution of plant communities and their influencing factors in the lower reaches of Tarim River,36 sample plots and important values of plant species surveyed in the field were used to classify the number of plant communities by the two-way indicator species analysis method(TWINSPAN),and the distributions of plant communities and influencing factors were analyzed by detrended correspondence analysis(DCA),canonical correspondence analysis(CCA)and detrended canonical correspondence analysis(DCCA).The results showed that:①among all the plots investigated,T.ramosissima had the highest frequency,accounting for 86.11%of the total plots.P.euphratica accounted for 41.67%of the total plots.P.aviculare,H.caspica,C.physodes,S.pellucida and K.scoparia had the lowest frequency,accounting for 2.78%of the total plots.②TWINSPAN classification classified all samples into 9 plant clusters,and the performance of their spatial distribution showed that P.euphratica,T.ramosissima and P.australis were mainly dominant species within 50 m reaches from the river.P.euphratica,A.sparsifolia,H.halodendron,T.ramosissima and P.australis were the dominant species within 150—500 m reaches from the river.P.euphratica and T.ramosissima were the dominant species within 500—1050 m reaches from the river.③The cumulative contribution rates of the first two principal component factors on environmental factors reached more than 50%.The contribution rate of each factor and the significance analysis showed that the total salt content and the depth of groundwater were main influence factors on the spatial distribution of plant communities in the lower reaches of Tarim River,which had great significance for studying the quantitative characteristics of plant communities,vegetation protection and ecological restoration in the lower reaches of Tarim River.
作者
刘星宏
张青青
张广鹏
李宏
LIU Xinghong;ZHANG Qingqing;ZHANG Guangpeng;LI Hong(College of Grass and Environmental Sciences,Xinjiang Agricultural University,Urumqi 830054,China;Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China)
出处
《中国农业科技导报》
CAS
CSCD
北大核心
2021年第10期131-144,共14页
Journal of Agricultural Science and Technology
基金
国家自然科学基金项目(41561103)。
关键词
塔里木河下游
植物群落
空间分布
影响因素
lower reaches of Tarim River
plant community
spatial distribution
influencing factors
