2024年2月25日 星期日
栲树叶片中不同类型钙含量对海拔梯度和土壤因子变化的响应
Responses of contents of different forms of calcium in leaf of Castanopsis fargesii to variations of altitude gradients and soil factors
2022年 第31卷 第4期 页码[28-36]    下载全文[1MB]  
摘要

在福建郭岩山县级森林生态自然保护区海拔500~900 m范围内以100 m为间隔设置5个样地,分别测定样地内栲树(Castanopsis fargesii Franch.)叶片中不同类型钙含量及土壤理化指标,在此基础上,采用Pearson法分析叶片不同类型钙含量间的相关性,采用RDA约束排序法分析叶片不同类型钙含量与海拔和土壤因子的关系。结果表明:各样地栲树叶片中不同类型钙含量从低至高均依次为硝酸钙和氯化钙、水溶性钙、果胶酸钙、磷酸钙和碳酸钙、草酸钙、硅酸钙,均值依次为54.06、208.57、820.56、1 122.54、1 891.58、6 962.60 mg·kg-1,且除海拔900 m样地外,其他样地的硅酸钙含量显著(P<0.05)高于另5类钙含量。总体上看,随海拔升高,栲树叶片硝酸钙和氯化钙含量逐渐降低,水溶性钙含量呈“降低—升高”趋势,果胶酸钙及草酸钙含量逐渐升高,磷酸钙和碳酸钙含量呈“升高—小幅降低”趋势,而硅酸钙含量则波动变化。在海拔500 m样地中,栲树叶片硝酸钙和氯化钙及硅酸钙含量最高,果胶酸钙及磷酸钙和碳酸钙含量最低;而在海拔900 m样地中,栲树叶片硝酸钙和氯化钙含量最低,果胶酸钙及草酸钙含量最高;在海拔700 m样地中,栲树叶片水溶性钙含量最低,磷酸钙和碳酸钙含量则最高。相关性分析结果表明:栲树叶片中硝酸钙和氯化钙含量与磷酸钙和碳酸钙含量呈极显著(P<0.01)负相关,与硅酸钙含量呈显著正相关;果胶酸钙及磷酸钙和碳酸钙含量与草酸钙含量呈极显著正相关。RDA排序结果表明:海拔和土壤全钙含量的解释率分别为28.8%和9.0%,贡献率分别为48.6%和15.1%。其中,海拔和土壤全钙含量与硝酸钙和氯化钙及硅酸钙含量均呈负相关,与水溶性钙、果胶酸钙、磷酸钙和碳酸钙及草酸钙含量呈正相关。综合分析结果表明:海拔和土壤全钙含量是影响栲树叶片中不同类型钙含量的重要因子;栲树叶片中果胶酸钙、磷酸钙和碳酸钙及草酸钙含量的协同增加可应对海拔升高引起的生境变化,增加植株的抗逆性。

Abstract

 Five sample plots were set up within the altitude range of 500-900 m at the interval of 100 m in the Countylevel Forest Ecological Nature Reserve of Guoyan Mountain in Fujian. The contents of different forms of calcium in leaf of Castanopsis fargesii Franch. and soil physical and chemical indexes in sample plots were measured. On this basis, the Pearson method was used to analyze the correlations among contents of different forms of calcium in leaf, and the RDA constrained ranking method was used to analyze the relationships between contents of different forms of calcium in leaf and altitude and soil factors. The results show that the contents of different forms of calcium in leaf of C. fargesii from low to high in order are calcium nitrate and calcium chloride, water soluble calcium, calcium pectate, calcium phosphate and calcium carbonate, calcium oxalate, and calcium silicate, their average values in order are 54.06, 208.57, 820.56, 1 122.54, 1 891.58, and 6 962.60 mg·kg-1, and except for the sample plot at the altitude of 900 m, the contents of calcium silicate of the other sample plots are significantly (P<0.05) higher than those of the other five forms of calcium. In general, with the increase of altitude, the content of calcium nitrate and calcium chloride in leaf of C. fargesii gradually decreases, the content of water soluble calcium shows a “decrease-increase” tendency, the contents of calcium pectate and calcium oxalate gradually increase, the content of calcium phosphate and calcium carbonate shows an “increase-slightly decrease” tendency, while the content of calcium silicate fluctuates. In the sample plot at the altitude of 500 m, the contents of calcium nitrate and calcium chloride and calcium silicate in leaf of C. fargesii are the highest, and the contents of calcium pectate and calcium phosphate and calcium carbonate are the lowest; in the sample plot at the altitude of 900 m, the content of calcium nitrate and calcium chloride in leaf of C. fargesii is the lowest, and the contents of calcium pectate and calcium oxalate are the highest; in the sample plot at the altitude of 700 m, the content of water soluble calcium in leaf of C. fargesii is the lowest, and the content of calcium phosphate and calcium carbonate is the highest. The result of correlation analysis shows that the content of calcium nitrate and calcium chloride in leaf of C. fargesii has an extremely significant (P<0.01) negative correlation with the content of calcium phosphate and calcium carbonate, and has a significant positive correlation with the content of calcium silicate; the contents of calcium pectate and calcium phosphate and calcium carbonate have extremely significant positive correlations with the content of calcium oxalate. The result of RDA ranking shows that the interpretation rates of altitude and total calcium content in soil are 28.8% and 9.0% respectively, and their contribution rates are 48.6% and 15.1% respectively. Among them, altitude and total calcium content in soil are negatively correlated with the contents of calcium nitrate and calcium chloride and calcium silicate, and are positively correlated with the contents of water soluble calcium, calcium pectate, calcium phosphate and carbonate, and calcium oxalate. The comprehensive analysis result shows that altitude and total calcium content in soil are important factors affecting the contents of different forms of calcium in leaf of C. fargesii; the synergistic increase of contents of calcium pectate, calcium phosphate and calcium carbonate, and calcium oxalate in leaf of C. fargesii can respond to the habitat change caused by the increase of altitude, and strengthen the stress resistance of plants. 

关键词栲树; 叶片钙含量; 海拔; 土壤理化指标; 土壤钙含量
Key wordsCastanopsis fargesii Franch.; calcium content in leaf; altitude; soil physical and chemical indexes; calcium content in soil
作者柏雨萱1, 刘丹萍1, 邢郑瑜1, 苏仪1, 林仁忠2, 廖晓丽3, 靳少非3, 郑德祥1
所在单位1. 福建农林大学林学院, 福建 福州 350002; 2. 顺昌县国有林场, 福建 顺昌 353200; 3. 闽江学院地理与海洋学院, 福建 福州 350108
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基金项目国家自然科学基金面上项目(32071760); 福建农林大学科技创新基金项目(KHF190026; KHF170002)