期刊文献+

关于氮有效性影响细根生产量和周转率的四个假说 被引量:38

Four hypotheses about the effects of soil nitrogen availability on fine root production and turnover
下载PDF
导出
摘要 在全球变化如氮沉降及温度升高等可能导致土壤氮有效性增加的背景下,细根动态如何变化一直是陆地生态学研究中的一个重要内容.本文综述了前人提出的细根动态响应土壤N有效性提高的4个代表性假说:1)细根生产量和周转率都提高;2)细根生产量和周转率都下降;3)细根生产量下降,周转率提高;4)细根生产量提高,周转率下降.根据2000年以来以微根管方法为主测得的根系动态数据,笔者认为假说1)和假说2)得到的支持最为充分.此外,还探讨了树种、细根异质性、菌根真菌、细根采样方法和施肥方法等对上述各假说检验的影响. With global changes such as increasing temperature and enhanced N deposition, soil nitrogen (N) availability is predicted to increase substantially, and how fine root dynamics responds to the altered soil N has become one of the key questions in terrestrial ecology. As such, a number of hypotheses have been proposed to explain the relationship between increasing soil N availability and fine root production, mortality, and turnover. This article considered four major hypotheses: with increasing soil N availability, 1 ) both fine root production and turnover rate would increase, 2) both fine root production and turnover rate would decrease, 3 ) fine root production would decrease while fine root turnover rate would increase, and 4) fine root production would increase while fine root turnover rate would decrease. Current evidence suggests that the patterns depicted in hypothesis 1 ) and 2) could both occur in nature and may reflect characteristics of different species. Hypotheses 3 ) and 4) were thought to characterize only a transient stage of the responses of fine root dynamics to increasing N availability. To better understand the response of root dynamics to increasing soil N, future studies should consider: 1 ) the definition of fine roots and heterogeneity in fine root structure and function; 2) methods used in estimating fine root production and turnover rate ; 3 ) changes of soil N availability both in space and time. More attention should also be paid to the influences of mycorrhizal infection on root dynamic responses to soil N availability.
机构地区 北京大学生态系
出处 《应用生态学报》 CAS CSCD 北大核心 2007年第10期2354-2360,共7页 Chinese Journal of Applied Ecology
基金 国家自然科学基金资助项目(30470294 90511002).
关键词 森林 细根 氮有效性 生产量 周转率 forest fine root nitrogen availability root production turnover rate.
  • 相关文献

参考文献54

  • 1Aber JD,Melillo JM,Nadelhoffer KJ,et al.1985.Fine root turnover in forest ecosystems in relation to quantity and form of nitrogen availability:A comparison of two methods.Oecologia,66:317-321.
  • 2Albaugh TJ,Allen HL,Dougherty PM,et al.1998.Leaf area and above-and belowground growth responses of loblolly pine to nutrient and water additions.Forest Science,44:317-328.
  • 3Burton AJ,Pregitzer KS,Hendrick RL.2000.Relationships between fine root dynamics and nitrogen availability in Michigan northern hardwood forests.Oecologia,125:389-399.
  • 4Burton AJ,Pregitzer KS,Ruess RW,et al.2002.Root respiration in North American forests:Effects of nitrogen concentration and temperature across biomes.Oecologia,131:559-568.
  • 5Coleman MD,Friend AL,Kern CC.2004.Carbon allocation and nitrogen acquisition in a developing Populus deltoides plantation.Tree Physiology,24:1347-1357.
  • 6Drew MC.1975.Comparison of the effects of a localised supply of phosphate,nitrate,ammonium and potassium.New Phytologist,75:479-490.
  • 7Drew MC,Saker LR,Ashley TW.1973.Nutrient supply and the growth of the seminal root system in barley.I.The effect of nitrate concentration on the growth of axes and laterals.Jouranal of Experimental Botany,24:1189-1202.
  • 8Eissenstat DM,Yanai RD.1997.The ecology of root life span.Advances in Ecological Research,27:1-60.
  • 9Espeleta JF,Donovan LA.2002.Fine root demography and morphology in response to soil resources availability among xeric and meric sandhill tree species.Functional Ecology,16:113-121.
  • 10Fahey TJ,Hughes JW.1994.Fine root dynamics in a northern hardwood forest ecosystem,Hubbard Brook Experimental Forest,NH.Journal of Ecology,82:533-548.

二级参考文献12

共引文献49

同被引文献765

引证文献38

二级引证文献407

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部