西南喀斯特和非喀斯特地区典型植物叶片养分特征-湖南生态科学学报-CSCIED科技核心评价数据库-手机版

西南喀斯特和非喀斯特地区典型植物叶片养分特征

Nutrient Characteristics of Typical Plant Leaves in Karst and Non-karst Regions of Southwest China

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DOI	10.3969/j.issn.2095-7300.2024.02.002
刊名	湖南生态科学学报 Journal of Hunan Ecological Science
年，卷(期)	2024, 11(2)
作者	刘清扬,王忠诚*,
作者单位	中南林业科技大学林学院,湖南长沙
摘要	【目的】喀斯特地区与非喀斯特地区森林之间环境条件差别大,通过比较研究两个地区典型植物叶片的养分特征,探究植物是如何改变元素之间的平衡性来适应不同环境。【方法】在广西和贵州沿纬度梯度选取7组喀斯特与非喀斯特的配对样地,采集优势物种植物叶片,测定其N、P、K、Ca、Mg元素含量,分析西南喀斯特与非喀斯特地区典型植物叶片养分特征、化学计量特征、元素之间相互关系以及随纬度的变化特征。【结果】(1)喀斯特地区植物叶片Ca、Mg含量(2.19g/kg、0.33g/kg)显著高于非喀斯特地区(0.92g/kg、0.20g/kg),K含量(6.53g/kg)显著低于非喀斯特地区(10.03g/kg)(P<0.05),N、P元素含量并无显著性差异。(2)在喀斯特地区和非喀斯特森林中,N与P、K、Mg之间均呈显著正相关关系(P<0.05),非喀斯特地区中P与K、Mg元素呈显著正相关关系(P<0.05),P与K元素之间的相关关系在不同岩性下有着显著的不同。(3)在喀斯特地区,N、P元素与纬度显著正相关,在非喀斯特地区,N、P、Ca、Mg与纬度有着显著相关性(P<0.05);P元素对纬度变化的响应都是最敏感的;喀斯特地区与非喀斯特地区的植物叶片N/P、N/K、K/P比与纬度均显著相关(P<0.05)。【结论】喀斯特与非喀斯特植物均为低钙型植物,P元素对纬度变化的响应最敏感,喀斯特地区和非喀斯特地区植物的N与P、K、Mg吸收,K与Mg吸收成一定的比例。在西南地区,随着纬度的升高,喀斯特与非喀斯特植物在生长过程中都受到了N元素的限制,不受K元素的限制。
Abstract	【Objective】Environmental conditions vary greatly between karst and non-karst forests. By comparing the nutrient characteristics of typical plant leaves in the two regions, we explored how plants change the balance between elements to adapt to different environments. 【Method】Seven groups of paired plots of karst and non-karst were selected along the latitudinal gradient in Guangxi and Guizhou, and the leaves of dominant species were collected, and their contents of N, P, K, Ca, and Mg elements were de- termined, and the nutrient characteristics, stoichiometric characteristics, interrelationships between ele- ments and the variation characteristics of typical plants in karst and non-karst regions of southwest China were analyzed. 【Result】The results showed that: (1) The contents of Ca and Mg in leaves in karst areas (2. 19 g / kg and 0. 33 g / kg) were significantly higher than those in non-karst areas (0. 92 g / kg and 0. 20 g / kg), and the contents of K (6. 53 g / kg) in karst areas were significantly lower than those in non-karst areas (10. 03 g / kg), and there was no significant difference in the contents of N and P. (2) There was a significant positive correlation between N and P, K and Mg in karst and non-karst areas, and P was significantly positively correlated with K and Mg in non-karst areas, and the correlation between P and K was significantly different under different lithologies. (3) In karst areas, N and P were significant- ly positively correlated with latitude, and in non-karst areas, N, P, Ca and Mg were significantly correla- ted with latitude. P was the most sensitive to latitudinal changes; the NP ratio, NK ratio and KP ratio of plant leaves in karst and non-karst areas were significantly correlated with latitude. 【Conclusion】Both karst and non-karst plants are low-calcium plants, and P is the most sensitive to latitudinal changes. The absorption of N and P, K , Mg in plants in karst and non-karst areas is in a certain proportion, and so is the absorption of K and Mg. In southwest China, with the increase of latitude, both karst and non-karst plants are limited by N but not by K during their growth.
关键词	喀斯特;典型植物叶片;叶片化学计量特征;纬度
KeyWord	karst; typical plant leaves; stoichiometric characteristics of leaves; latitude
基金项目
页码	10-17

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刘清扬,王忠诚*. 西南喀斯特和非喀斯特地区典型植物叶片养分特征 [J]. 湖南生态科学学报. 2024; 11; (2). 10 - 17.

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