img

官方微信

高级检索

中国沙漠 ›› 2020, Vol. 40 ›› Issue (6): 223-232.DOI: 10.7522/j.issn.1000-694X.2020.00087

• • 上一篇    下一篇

水、氮施用量对科尔沁沙地植被特征和叶性状的影响

孙一梅1(), 田青1(), 郭爱霞2,4, 左小安3, 吕朋3, 张森溪2,4   

  1. 1.甘肃农业大学 林学院,甘肃 兰州 730070
    2.中国科学院西北生态环境资源研究院,乌拉特荒漠草原研究站,甘肃 兰州 730000
    3.中国科学院西北生态环境资源研究院,奈曼沙漠化研究站,甘肃 兰州 730000
    4.中国科学院大学,北京 100049
  • 收稿日期:2020-06-05 修回日期:2020-09-03 出版日期:2020-12-09 发布日期:2020-12-09
  • 通讯作者: 田青
  • 作者简介:田青(E-mail: 1620436081@qq.com
    孙一梅(1995—),女,甘肃张掖人,硕士研究生,主要从事水土保持与植被恢复研究。E-mail: 1142309846@qq.com
  • 基金资助:
    国家自然科学基金项目(41622103);中国科学院青年创新促进会项目(1100000036);中国科学院大学生创新实践训练计划项目

Effects of water and nitrogen changes on vegetation characteristics and leaf traits in Horqin Sandy land, Northern China

Yimei Sun1(), Qing Tian1(), Aixia Guo2,4, Xiaoan Zuo3, Peng Lv3, Senxi Zhang2,4   

  1. 1.College of Forestry,Gansu Agricultural University,Lanzhou 730070,China
    2.Urat Desert-Grasslas Land Research Station,Northwest Institute of Eco-Environment and Resource,Chinese Academy of Sciences,Lanzhou 730000,China
    3.Naiman Desertification Research Station,Northwest Institute of Eco-Environment and Resource,Chinese Academy of Sciences,Lanzhou 730000,China
    4.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2020-06-05 Revised:2020-09-03 Online:2020-12-09 Published:2020-12-09
  • Contact: Qing Tian

摘要:

为了研究降雨格局变化和氮沉降对半干旱沙质草地植被特征和优势种叶性状的影响,设置自然降雨(W0)、减雨(W-60%与W-100%)和增雨(W+60%与W+100%)5个水分处理及氮添加处理(20 g·m-2·a-1(N+)),进行水氮耦合试验。结果表明:(1)减雨(W-60%与W-100%)显著降低了群落盖度、地上生物量和凋落物量(P<0.05),增雨(W+60%)显著增加了叶面积(P<0.05),而比叶面积和叶干物质含量在不同降雨处理下无显著变化(P>0.05);(2)氮添加显著增加了植物群落盖度、高度、地上生物量和叶面积,显著降低了叶干物质含量(P<0.05),而密度、凋落物量和比叶面积无显著变化(P>0.05);(3)增雨(W+60%与W+100%)处理下,氮添加显著增加了群落盖度(P<0.05),密度、地上生物量、凋落物量、叶面积和比叶面积在增雨60%和氮添加交互处理下达到最大值,减雨60%处理下,氮添加显著降低了叶干物质含量(P<0.05)。以上结果说明氮添加能缓解干旱对植物造成的影响,且适当增雨有利于氮素肥力的激发。

关键词: 降雨变化, 氮添加, 植被特征, 功能性状, 科尔沁沙地

Abstract:

To demonstrate the effects of changes in precipitation pattern and nitrogen deposition on the vegetation community characteristics and leaf traits of dominant species in semi-arid sandy grassland, we examined water and nitrogen interactions, using five levels of water treatment [natural precipitation (W0), reduced precipitation (W-60% and W-100%) and increased precipitation (W+60% and W+100%)] and two nitrogen levels [0(N0) and 20 g·m-2·a-1(N+)]. The results showed that: (1) precipitation reduction (W-60% and W-100%) significantly reduced community coverage, aboveground biomass and litter biomass (P<0.05). The increased precipitation 60% significantly increased the leaf area (P<0.05), while the specific leaf area and leaf dry matter mass had no significant change under different precipitation treatments (P>0.05); (2) nitrogen addition significantly increased plant community coverage, height, aboveground biomass and leaf area, while significantly reduced leaf dry matter content(P<0.05). Community density, litter biomass and specific leaf area had no significant change (P>0.05); (3) nitrogen addition significantly increased the community coverage under the treatment of increasing precipitation (W+60% and W+100%, P<0.05), and the community density, aboveground biomass, litter biomass, and leaf area reached the maximum under the interactive treatment of 60% precipitation increase and nitrogen addition, while nitrogen addition significantly reduced the leaf dry matter content under the treatment of 60% precipitation reduction (P<0.05). The above results show that nitrogen addition can alleviate the impact of drought on plants, and proper precipitation increase is beneficial to the stimulation of nitrogen fertility.

Key words: precipitation change, nitrogen addition, vegetation characteristics, leaf traits, Horqin Sandy Land

中图分类号: