Calcium content and high calcium adaptation of plants in karst areas of southwestern Hunan, China
Calcium content and high calcium adaptation of plants in karst areas of southwestern Hunan, China
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DOI：
10.5194/bg-15-2991-2018
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发表时间：
2017-11
期刊：
影响因子：
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通讯作者：
Xiaocong Wei;X. Deng;W. Xiang;P. Lei;S. Ouyang;H. Wen;Liang Chen
中科院分区：
文献类型：
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作者：
Xiaocong Wei;X. Deng;W. Xiang;P. Lei;S. Ouyang;H. Wen;Liang Chen
抽象。石漠化是喀斯特地区土地退化的主要生态问题。在这些地区，土壤钙含量高已成为影响植被恢复的重要环境因子。因此，筛选适应高钙土壤环境的植物种类是植被恢复的关键。在湘西南喀斯特地区选取了3个等级的石漠化样区（LRD：轻度石漠化; MRD：中度石漠化; IRD：重度石漠化）。每个等级样地在不同坡位设3块样地，每块样地设4个小样方（1个在石质边坡区，3个在非石质边坡区）。测定了41种植物的叶、枝、根的钙含量，以及0-15、15-30和30-45 cm土层的土壤全钙和交换性钙含量。结果表明，多岩地区土壤Ca 2+含量显著高于非多岩地区（p <0.05）。土壤TCa和ECa平均含量随石漠化程度的增加而沿着增加，其顺序为IRD > MRD > LRD。在所有功能组中，地上部分的植株钙含量显著高于地下部分（p <0.01）。土壤ECa含量对植株地上部Ca含量影响不显著，而对地下部Ca含量影响显著。在41种植物中，有17种植物占优势（重要值> 1）。计算了17种优势植物地上部和地下部Ca 2+含量的差异，并分析了其与土壤ECa含量的相关性。结果表明，这17种植物可分为钙中性植物、高钙植物和低钙植物3大类。研究结果为石漠化地区植被恢复和生态系统重建提供了重要的理论依据和实践指导。
Abstract. Rocky desertification is a major ecological problem of land degradation in karst areas. In these areas, the high soil calcium (Ca) content has become an important environmental factor that can affect the restoration of vegetation. Consequently, the screening of plant species that can adapt to high Ca soil environments is a critical step in vegetation restoration. In this study, three grades of rocky desertification sample areas were selected in karst areas of southwestern Hunan, China (LRD: light rocky desertification; MRD: moderate rocky desertification; and IRD: intense rocky desertification). Each grade of these sample areas had three sample plots in different slope positions, each of which had four small quadrats (one in rocky-side areas, three in non-rocky-side areas). We measured the Ca content of leaves, branches, and roots from 41 plant species, as well as soil total Ca (TCa) and exchangeable Ca (ECa) at depths of 0–15, 15–30, and 30–45 cm in each small quadrat. The results showed that the soil Ca2+ content in rocky-side areas was significantly higher than that in non-rocky-side areas ( p ). The mean soil TCa and ECa content increased gradually along with the grade of rocky desertification, in the order IRD > MRD > LRD. For all plant functional groups, the plant Ca content of aboveground parts was significantly higher than that of the belowground parts ( p ). The soil ECa content had significant effects on plant Ca content of the belowground parts but had no significant effects on plant Ca content of the aboveground parts. Of the 41 plant species that were sampled, 17 were found to be dominant (important value > 1). The differences in Ca2+ content between the aboveground and belowground parts of the 17 dominant species were calculated, and their correlations with soil ECa content were analyzed. The results showed that these 17 species can be divided into three categories: Ca-indifferent plants, high-Ca plants, and low-Ca plants. These findings provide a vital theoretical basis and practical guide for vegetation restoration and ecosystem reconstruction in rocky desertification areas.