文章摘要
康继月, 王世琪, 刘金彪, 李敏, 王智, 徐炳成.旱后复水条件下磷添加对白羊草根系形态及氮磷累积的影响[J].水土保持学报,2019,33(6):273~279,287
旱后复水条件下磷添加对白羊草根系形态及氮磷累积的影响
Effects of Phosphorus Addition on Root Morphology, Nitrogen and Phosphorus Accumulation of Old World Bluestems Under Re-watering After Drought
投稿时间:2019-07-04  
DOI:10.13870/j.cnki.stbcxb.2019.06.038
中文关键词: 白羊草  旱后复水  根冠比  根系形态  氮磷含量
英文关键词: Old World bluestems  re-watering after drought  root/shoot ratio  root morphology  N and P contents
基金项目:国家自然科学基金项目(41371509,41771553)
作者单位E-mail
康继月1,3, 王世琪2, 刘金彪2, 李敏2, 王智1,2, 徐炳成1,2 1. 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨凌 712100

2. 西北农林科技大学水土保持研究所
, 陕西 杨凌 712100

3. 中国科学院大学
, 北京 100049 
wangzhi712@nwafu.edu.cn;Bcxu@ms.iswc.ac.cn 
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中文摘要:
      植物生长及养分利用特征可揭示半干旱区植物对多变水肥环境条件的适应策略。在白羊草分蘖期设置2个供水条件(正常供水和干旱胁迫21天后复水)和2个磷添加水平(复水当日1 kg干土添加0,0.2 g P2O5),2周后测定其根冠生物量、根系形态以及氮磷含量。结果表明,旱后复水条件下,磷添加后白羊草根冠生物量、总生物量和根冠比无显著变化,总根长和根表面积显著增加27.1%和24.1%,比根长和比根面积分别显著增加18.3%和15.9%,根系平均直径显著降低1.3%;白羊草地上部、根系和整株磷含量分别显著增加61.1%,35.8%和49.6%,磷累积量分别显著增加68.6%,52.0%和61.3%,氮磷比显著降低。除地上部氮累积量外,各水分和磷处理下白羊草地上部、根系和整株氮磷累积量与总根长和根表面积呈显著正相关关系。本研究表明,根长和根表面积增加是白羊草响应水肥环境条件改善的主要策略。
英文摘要:
      To identify the adaptation strategies of plants in semi-arid areas to periodical changes of water and nutrient supply, a pot experiment was conducted to investigate plant growth, root morphological characteristics, N and P concentration under two soil moisture conditions (well-watered and post-drought rehydration) and two phosphorus (P) addition levels (0 and 0.2 g P2O5 per kg dry soil) of Old World bluestems at its jointing stage. Results showed that under re-watering after drought, effect of P addition on shoot and root biomass, total biomass, and root/shoot ratio of Old World bluestems have no significant difference, while total root length and root surface area increase 27.1% and 24.1%, specific root length and specific root area increase 18.3% and 15.9%, and root average diameter decrease 1.3%. P concentration in shoot, root and whole plant of Old World bluestems significantly increased 61.1%, 35.8% and 49.6%, respectively, and P accumulation significantly increased 68.6%, 52.0% and 61.3%, respectively, and, N:P ratio decreased significantly. In addition to N accumulation in shoot, N and P accumulation in shoot, root, and whole plant of Old World bluestems under different water and phosphorus treatments showed significant positive correlation with total root length and root surface area. The present study suggested that increases in root length and root surface area were the main adaptation strategies of Old World bluestems in response to periodical changes of water supply and phosphorus addition.
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