• 主题
高级搜索  >
历史搜索 清空历史
首页> 中文期刊> 《农业工程学报》 >科尔沁沙地草地植物群落功能性状对封育和放牧的响应

科尔沁沙地草地植物群落功能性状对封育和放牧的响应

         
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Functional traits as a link between plants and environment, express plants' physiological, phenological and morphological adaptive strategy when plants face environment changes. In recent years, some trait-based means show that plant functional traits are some of the most reliable predictors of ecosystem, increasingly used to assess and predict the ecosystem feature and succession. Grazing is one of the most common utilization methods for pasture, affecting the semiarid and arid grassland ecosystems in various ways. It not only alters individual plant growth and population dynamics, but also changes soil properties, ultimately changing the vegetation composition and structure. The influence of grazing on plant communities is much greater than that of individual plant. At the community level, herbivores have extensive range of food intake, and different plant species have different response to nibbling, and therefore, it is more reasonable to explore the influence of grazing at the community level. Based on the changes of 18 dominant species in 4 different types of grassland under grazing and enclosure in Horqin sandy land, in this study, we compared the plant community functional traits in the meadow, Stipa steppe, scattered tree grassland and sandy grassland. We measured the 6 functional traits related to the process of plant growth and photosynthesis in different types of grassland under the condition of enclosure and grazing, and these traits included the plant height, specific leaf area (SLA), leaf dry matter content (LDMC), leaf area (LA), leaf nitrogen content (LNN) and leaf carbon isotopes (δ13C). The results showed that: 1) Long term grazing increased the species richness and dominance of annuals and C4 species, as well as decreased the relative biomass of perennials; 2) The SLA and δ13C in sandy grassland were higher than the other 3 types of grassland, while LDMC showed a reversed trend; 3) Grazing decreased the plant height and LA and increased the δ13C, while the other functional traits in different grasslands did not differ due to grazing; 4) Correlation relationship analysis showed that SLA was significantly and negatively correlated with LDMC in different types of grassland under both grazing and enclosure, suggesting that long term grazing did not change the negative associations of SLA and LDMC; however, long term grazing resulted in the significant and negative correlations between plant height, SLA and δ13C, as well as a significant and positive correlation between SLA and δ13C. In Horqin sandy land, long term grazing increased the proportion of annuals and C4 species, and these species had the lower plant height and LA and the higher water use efficiency, which illustrates that the grassland community adapts to the long term grazing through the change in species competition structure and function strategy trade off. Therefore, to improve the functional traits of plant community by reducing grazing pressure is helpful and meaningful to the vegetation restoration and sustainable management in the degraded grasslands.%该研究以科尔沁沙地中草甸(meadow)、针茅草原(Stipa steppe)、疏林草地(scattered tree grassland)和沙质草地(sandy grassland)4种草地的18种优势植物为研究对象,分别测定了不同草地植物群落在封育和放牧下的高度(height)、比叶面积(specific leaf area,SLA)、叶片干物质含量(leaf dry matter content,LDMC)、叶片面积(leaf area,LA)、叶片氮含量(leaf nitrogen content,LNC)和叶片碳同位素(leaf carbon isotopes)6个相关于植物生理生态过程的功能性状指标.结果表明:1)长期放牧增加了草地中一年生植物和C4植物的丰富度和重要值,降低了沙质草地中多年生植物的相对生物量;2)沙质草地植物群落的SLA和 δ13C高于其他3种草地,LDMC小于其他3种草地;3)长期放牧降低了草地植物群落的高度和LA,增加了草地植物群落的 δ13C,SLA、LDMC和LNC则不受放牧的影响;4)植物功能性状中,SLA与LDMC极显著负相关且不受放牧的干扰;而长期放牧导致了高度与SLA和 δ13C显著负相关以及SLA和 δ13C显著正相关.科尔沁沙地长期放牧的草地中一年生植物和C4植物比例相对增加,且优势植物具有较低的高度和LA以及较高的 δ13C,表明了草地植物群落通过物种竞争结构和功能性状权衡策略的改变来适应长期放牧.因此,减轻放牧压力,改善植物群落的功能性状,对于该区域退化草地的恢复及持续管理具有一定的重要意义.

著录项

  • 来源
    《农业工程学报》 |2017年第24期|261-268|共8页
  • 作者

    张晶; 何钊全; 左小安; 杨阳; 岳喜元; 张婧; 吕朋; 周欣; 连杰; 刘良旭;

  • 作者单位

    中国科学院西北生态环境资源研究院乌拉特荒漠草原站,兰州 730000;

    中国科学院西北生态环境资源研究院奈曼沙漠化研究站,兰州 730000;

    中国科学院大学,北京 100049;

    中国科学院西北生态环境资源研究院奈曼沙漠化研究站,兰州 730000;

    中国科学院西北生态环境资源研究院乌拉特荒漠草原站,兰州 730000;

    中国科学院西北生态环境资源研究院奈曼沙漠化研究站,兰州 730000;

    中国科学院西北生态环境资源研究院乌拉特荒漠草原站,兰州 730000;

    中国科学院西北生态环境资源研究院乌拉特荒漠草原站,兰州 730000;

    中国科学院西北生态环境资源研究院乌拉特荒漠草原站,兰州 730000;

    中国科学院西北生态环境资源研究院乌拉特荒漠草原站,兰州 730000;

    中国科学院西北生态环境资源研究院奈曼沙漠化研究站,兰州 730000;

    中国科学院西北生态环境资源研究院奈曼沙漠化研究站,兰州 730000;

    中国科学院西北生态环境资源研究院乌拉特荒漠草原站,兰州 730000;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 环境生物学;
  • 关键词

    植物; 生长; 生理学; 草地; 放牧; 草地植物群落; 封育; 不同草地类型;

相似文献

  • 中文文献
  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号