塔里木河上游典型荒漠植物叶片性状及其与土壤因子的关系
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新疆维吾尔自治区自然科学基金(2020D01C053);国家自然科学基金(32001145);新疆维吾尔自治区教育厅"天池博士计划"(TCBS202054)


Leaf characteristics of typical desert plants in the upper reaches of Tarim River and their relationship with soil factors
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    摘要:

    为了了解塔里木河上游地区荒漠植物叶片的功能性状及其对不同生境的生态适应性,以花花柴(Karelinia caspica)和骆驼刺(Alhagi sparsifolia)两种典型荒漠植物为研究对象,分析沙地和盐碱地等不同生境下两种荒漠植物叶片的结构性状和化学性状,并结合冗余分析探讨了其与土壤因子的关系。结果表明:(1)研究区花花柴、骆驼刺两种荒漠植物的叶厚度(LT)、叶面积(LA)、比叶面积(SLA)及叶组织密度(LTD)等结构性状在不同物种之间存在显著差异(P<0.05),而叶片有机碳(LOC)、氮(LN)、磷(LP)含量等化学性状在不同生境之间存在显著差异(P<0.05),其平均值分别为417.67g/kg、15.14g/kg及1.12g/kg,低于全球植物叶片平均水平。(2)在沙地和盐碱地等不同生境下两种荒漠植物叶片LA、SLA及LTD等均呈极显著负相关(P<0.01),LA和N/P是两种生境下植物叶片性状中综合排名前三的共同指标因子。(3)冗余分析结果表明,土壤因子中的土壤含水量(SWC)、土壤有机碳(SOC)和土壤氮(SN)对荒漠植物叶片性状变异起到了较好的解释。本研究表明不同荒漠植物在长期进化过程中形成了相对稳定的叶片结构性状特征,而叶片化学性状对生境土壤因子的变化则较为敏感。

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    In the context of global climate change, plant functional traits changes are the hot research area in the ecology field concerning by a lot of researchers. As the most direct organ in contact with the external environment, plant leaf exhibits a greater plasticity and sensitivity, which can be represented by diverse responses in plant leaf functional traits to environmental changes. The upper reaches of Tarim River was a typical arid region, distributing many desert plants, which playing important roles in maintaining local ecological security, sandy land and saline alkali land are the most common habitats for these desert plants growing. In order to understand the functional traits of desert plant leaves and their ecological adaptability to different habitats in the upper reaches of Tarim River, two typical desert plants, Karelinia caspica and Alhagi sparsifolia, were chosen in this study. Their leaf structural and chemical traits in different habitats (including sandy land and saline alkali land) were analyzed and the relationship between these traits and soil factors were discussed combining with redundancy analysis. The results showed that:(1) there were significant differences in leaf structural traits between two studied species (P < 0.05), including leaf thickness (LT), leaf area (LA), specific leaf area (SLA), and leaf tissue density (LTD); while the differences in chemical traits were significant between two different habitats (P < 0.05), including the leaf organic carbon content (LOC), leaf nitrogen content (LN), and leaf phosphorus content (LP), their average values were 417.67 g/kg, 15.14 g/kg and 1.12 g/kg, respectively, which were lower than the average level of global plant leaves (464g/kg、18.3 g/kg、1.80 g/kg, respectively). (2) In sandy land and saline alkali land habitats, the LA of two studied plants both showed extremely significant positive correlations with SLA (P < 0.01), while the LA, SLA of two studied plants both showed significant negative correlations with LTD (P < 0.01), and LA as well as N/P were the top three common index factors of plant leaf functional traits in different habitats. (3) Redundancy analysis showed that soil factors, including soil water content (SWC), soil organic carbon (SOC), and soil nitrogen (SN) had significant effects on desert plant leaf traits. This study demonstrated that desert plants have developed relatively stable leaf structural traits in the long-term evolution, and leaf chemical traits were more sensitive to the changes in soil factors of their habitats.

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李蕊希,吴雪,贡璐.塔里木河上游典型荒漠植物叶片性状及其与土壤因子的关系.生态学报,2022,42(13):5360~5370

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