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中国沙漠 ›› 2017, Vol. 37 ›› Issue (1): 81-85.DOI: 10.7522/j.issn.1000-694X.2015.00195

• 生物与土壤 • 上一篇    下一篇

鄱阳湖沙山单叶蔓荆(Vitex rotundifolia)叶性状沿沙化梯度变化特征

常玲玲1, 蔡家艳1, 吴琴1, 金奇1, 周红艳1, 胡启武1,2   

  1. 1. 江西师范大学 地理与环境学院, 江西 南昌 330022;
    2. 江西师范大学 鄱阳湖湿地与流域研究教育部重点实验室, 江西 南昌 330022
  • 收稿日期:2015-10-16 修回日期:2015-12-22 出版日期:2017-01-20 发布日期:2017-01-20
  • 通讯作者: 胡启武(E-mail:huqiwu1979@gmail.com)
  • 作者简介:常玲玲(1990-),女,河南洛阳人,硕士研究生,主要从事生态化学计量学研究。E-mail:764892781@qq.com
  • 基金资助:
    江西省教育厅科技落地计划项目“鄱阳湖沙化土地与水土流失治理技术推广与示范”;国家自然科学基金项目(31460129)

Leaf Traits of Vitex rotundifolia along Desertification Gradient in a Sandy Hill of the Poyang Lake

Chang Lingling1, Cai Jiayan1, Wu Qin1, Jin Qi1, Zhou Hongyan1, Hu Qiwu1,2   

  1. 1. School of Geography and Environment;
    2. Key Laboratory of Poyang Lake Wetland and Watershed Research of Ministry of Education, Jiangxi Normal University, Nanchang 330022, China
  • Received:2015-10-16 Revised:2015-12-22 Online:2017-01-20 Published:2017-01-20

摘要: 在鄱阳湖湖滨沙山沿沙化梯度测定了单叶蔓荆(Vitex rotundifolia)叶面积、比叶面积、叶氮、叶磷等指标,以阐明单叶蔓荆主要叶性状特征,探讨叶性状对沙化程度的响应。结果表明:单叶蔓荆叶面积1.58~13.14 cm2,与湖岸线距离没有显著相关性,不能指示沙化程度对单叶蔓荆的影响。比叶面积81.6~206.3 cm2·g-1,种内差异显著(P<0.05);单位质量的叶氮、磷含量分别为16.0~23.2 mg·g-1、0.82~2.20 mg·g-1,种内差异不显著。比叶面积与叶片氮含量显著正相关(P<0.05),与叶片磷含量无显著相关性。比叶面积对沙化梯度响应敏感,随沙化程度的增加而降低;叶片氮、磷含量及其化学计量比值对沙化程度的变化不敏感,保持了相对稳定性。依据叶片氮磷比值判断,单叶蔓荆在沙山生境中更多地受磷的限制。

关键词: 鄱阳湖, 沙山, 单叶蔓荆(Vitex rotundifolia), 比叶面积, 叶氮, 叶磷

Abstract: There are some sandy hills distributed along Poyang Lake, which belong to typical southern desertification. As located in subtropical climate zone, the sandy hills differed in vegetation and soil from northern deserts. In this study, leaves of Vitex rotundifolia were sampled along desertification intensity gradient in Duobao sandy hill, Poyang Lake. Subsequently, leaf area, specific leaf area (SLA), leaf nitrogen (N) and phosphorus (P) were measured. The objective of this study was to clarify the intraspecific variation in leaf traits and the responses to desertification intensity variation. Results indicated that leaf area of V. rotundifolia ranged from 1.58 to 13.14 cm2. No significant correlation was found between leaf area and the distance away from lakeshore line. Thus, leaf area could not indicate the effects of desertification intensity on V. rotundifolia. SLA varied from 81.6 to 206.3 cm2·g-1. SLA showed significant intraspecific difference (P<0.05). Leaf N ranged from 16.0 to 23.2 mg·g-1, whereas leaf P varied from 0.82 to 2.20 mg·g-1. Both leaf N and P showed no significant intraspecific difference. SLA was significantly positively correlated with leaf N, but not with leaf P. SLA was very sensitive to desertification intensity variation, and decreased with the increase of desertification. However, leaf N and P, as well as N:P stoichiometry were not sensitive to the desertification variation, and maintained relatively stable. According to the ratio of leaf N:P, V. rotundifolia was more limited by phosphorus, rather than nitrogen.

Key words: Poyang Lake, sandy hills, Vitex rotundifolia, specific leaf area, leaf nitrogen, leaf phosphorus

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