自然降水变异调控荒漠草原常见植物的养分回收对长期增温和氮素添加的响应
DOI:
作者:
作者单位:

1.草原与资源环境学院;2.内蒙古农业大学草原与资源环境学院

作者简介:

通讯作者:

中图分类号:

基金项目:

国家重点研发计划项目(2016YFC0500504);国家自然科学基金(31760146,31760143);教育部草地资源重点实验室和农业部饲草加工、教育部创新团队(IRT17R59);内蒙古自治区重大科技专项和西部之光项目资助


Responses of Two Common Plant Nutrient Resorption to Long-term Warming and Nitrogen Addition are Regulated by Natural Precipitation Variations In Desert Grassland
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    摘 要:气温升高和大气氮沉降作为全球变化的两个重要成分,会影响植物—土壤之间的养分循环过程。为了探讨荒漠草原植物养分回收特征对长期增温和氮素添加的响应及自然降水对其的调控作用,本研究依托开展了12年的模拟增温和氮素添加实验平台,在相对多雨的2016年(超过长期均值52%)和相对少雨的2017年(低于长期均值16%),以两种常见植物为研究对象:包括C3植物银灰旋花(Convolvulus ammannii)和C4植物木地肤(Kochia prostrata),测定了绿叶和枯叶的氮磷浓度及土壤无机氮、有效磷和土壤含水量。结果显示:(1)在相对多雨年(2016),增温和氮素添加分别使土壤无机氮显著增加43.1%和52.1%,使土壤有效磷显著增加20.3%和27.55% (P < 0.01);增温、氮素添加、增温与氮素添加共同处理使两种植物绿叶、枯叶氮磷浓度显著增加,使氮磷回收效率显著降低;(2)在相对少雨年(2017),增温、氮素添加、增温与氮素添加共同处理对土壤无机氮、有效磷及植物叶片氮磷浓度、回收效率均无显著影响;(3)回归分析表明植物叶片氮磷浓度随着土壤无机氮、有效磷及含水量的增加而增加,植物氮磷回收效率则随着土壤养分有效性、土壤湿度的提高而降低。这些结果表明植物养分回收对全球变化的响应受到自然降水变异的调控。

    Abstract:

    Abstract:Climate warming and increased nitrogen (N)deposition, as two important components of global change, can influence the nutrient cycle between plants and soils. Based on a 12-year simulated warming and N addition experiment, we explored the effects of warming and N addition on nutrient resorption for two common species, C3 plant Convolvulus ammannii and C4 plant Kochia prostrata, in 2016 with 52% above the long-term mean precipitation and in 2017 with 16% below the long-term mean. Plant N and phosphorus (P),soil inorganic N and soil available P and soil water content were measured. Our results showed that:(1)In the wet year(2016),warming and N addition significantly increased soil inorganic N by 43.1% and 52.1% ,respectively(P < 0.001), and enhanced available P by 20.3% and 27.55% ,respectively(P < 0.001).Compared to the control, warming, N addition and combined warming and N addition significantly enhanced N and P concentrations in green and senesced leaves of the studied two plants and reduced resoption efficiency of N and P;(2)In the dry year(2017), warming and N addition, had no significant effect on the plant and soil nutrient characteristics;(3)Regression analysis indicated that soil available N, P and water were positively correlated with plant N and P concentrations, but negatively with nutrient resorption. These findings suggest that the responses of nutrient resorption to warming and N addition could be mediated by variations of natural precipitation.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2019-05-12
  • 最后修改日期:2019-08-03
  • 录用日期:2019-08-01
  • 在线发布日期:
  • 出版日期:

微信公众号二维码

手机版网站二维码