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岷江干旱河谷土壤水、氮和磷对小马鞍羊蹄甲幼苗生长的影响
引用本文:宋成军,马克明,傅伯杰,曲来叶,刘杨,钟剑飞.岷江干旱河谷土壤水、氮和磷对小马鞍羊蹄甲幼苗生长的影响[J].应用生态学报,2009,20(8):1797-1804.
作者姓名:宋成军  马克明  傅伯杰  曲来叶  刘杨  钟剑飞
作者单位:1. 中国科学院生态环境研究中心城市与区域生态国家重点实验室,北京,100085
2. 北京林业大学,北京,100083
基金项目:,国家自然科学基金创新研究群体基金,国家自然科学基金,中国科学院西部行动计划(二期)项目
摘    要:资源阈值对植物的影响是恢复生态学的重要议题.通过近似模拟岷江干旱河谷自然干旱条件下水、氮和磷的阈值,设计析因实验,研究了一个生长季节内小马鞍羊蹄甲幼苗生长、生物生产量、资源利用效率和存活率的变化.结果表明:高水(40%田间持水量)、高磷(24 mg P·kg-1)和低氮(100 mg N·kg-1)处理分别促进了幼苗生长,增加了生物生产量,提高了存活率和水分利用效率,氮磷交互作用显著,水分和养分交互作用不明显.高氮(240 mg N·kg-1)有强烈的负效应,高磷可以增大根面积、根长和根生物量,提高对氮和磷的吸收,缓解高氮的抑制作用.养分利用效率和幼苗根茎比呈显著正相关,并保持相对稳定.高水、高磷和低氮耦合有效地促进了幼苗的生长,而低水、低磷和高氮耦合则明显抑制了幼苗生长.

关 键 词:小马鞍羊蹄甲  干旱河谷  水养互作  资源阈值  生长
收稿时间:2009-03-25

Influence of soil moisture, nitrogen and phosphorus contents on Bauhinia faberi seedlings growth characteristics in arid valley of Minjiang River
SONG Cheng-jun,MA Ke-ming,FU Bo-jie,QU Lai-ye,LIU Yang,ZHONG Jian-fei.Influence of soil moisture, nitrogen and phosphorus contents on Bauhinia faberi seedlings growth characteristics in arid valley of Minjiang River[J].Chinese Journal of Applied Ecology,2009,20(8):1797-1804.
Authors:SONG Cheng-jun  MA Ke-ming  FU Bo-jie  QU Lai-ye  LIU Yang  ZHONG Jian-fei
Institution:State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085 China;Beijing Forestry University, Beijing 100083, China
Abstract:To study the influence of resources thresholds on plant growth is a major theme in restoration ecology. Based on the simulation of the natural thresholds of soil moisture, nitrogen (N), and phosphorus (P) under drought condition in the arid valley of Mingjiang River, a full factorial experiment was designed to study the dynamics of Bauhinia faberi seedlings survival rate, growth, biomass production, and resources use efficiency across one growth season. High soil moisture (40% field water capacity), high soil P (24 mg P·kg-1), and low N (100 mg N·kg-1) increased the seedlings survival rate, and promoted the seedlings growth, biomass production, and water use efficiency. There was a significant coupling effect between soil N and P, but the interactions between soil moisture and soil N and P were not obvious. High N (240 mg N·kg-1) restrained the seedlings growth markedly, while high P mitigated the negative effects of high N via increasing root area, root length, and root mass to promote the seedlings N and P uptake. The N and P use efficiency across one growth season kept steady, and had significant positive correlation with root/shoot mass ratio. The combination of high soil moisture, low N, and high P promoted the seedlings growth effectively, while that of low soil moisture, low P, and high N inhibited the seedlings growth markedly.
Keywords:Bauhinia faberi  arid valley  water-nutrients interaction  resources thresholds     growth
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