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应用生态学报 ›› 2016, Vol. 27 ›› Issue (8): 2467-2476.doi: 10.13287/j.1001-9332.201608.037

• 目次 • 上一篇    下一篇

施氮频率和强度对内蒙古温带草原土壤pH及碳、氮、磷含量的影响

周纪东1,2, 史荣久1, 赵峰1, 韩斯琴1, 张颖1*   

  1. 1中国科学院沈阳应用生态研究所污染生态与环境工程重点实验室, 沈阳 110016;
    2中国科学院大学, 北京 100049
  • 收稿日期:2015-12-30 发布日期:2016-08-18
  • 通讯作者: * E-mail: yzhang@iae.ac.cn
  • 作者简介:周纪东,男,1989年生,硕士研究生.主要从事环境微生物学和分子生态学研究.E-mail:zjdxuesong@163.com
  • 基金资助:
    本文由国家重点基础研究发展计划项目(2011CB403205)和国家自然科学基金重点项目(41330530)资助

Effects of the frequency and intensity of nitrogen addition on soil pH, the contents of carbon, nitrogen and phosphorus in temperate steppe in Inner Mongolia, China.

ZHOU Ji-dong1,2, SHI Rong-jiu1, ZHAO Feng1, HAN Si-qin1, ZHANG Ying1*   

  1. 1Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
    2University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-12-30 Published:2016-08-18
  • Contact: * E-mail: yzhang@iae.ac.cn
  • Supported by:
    This work was supported by the National Key Basic Research and Development Plan (2011CB403205) and the National Natural Science Foundation of China (41330530).

摘要: 以内蒙古温带典型草原为研究对象,通过 9 个氮沉降梯度以及一年 12 次和一年 2 次的施氮频率比对,经过4年的氮沉降模拟,研究不同氮沉降强度和频率对不同土层土壤 pH 及碳、氮、磷含量的影响.结果表明: 随着施氮强度的增加,土壤 pH 及全磷含量逐渐降低,但土壤有效氮和有效磷的含量呈增加趋势,可溶性有机碳(DOC)含量无明显变化规律,而土壤全碳、全氮含量基本保持不变.与更接近于自然氮沉降状况的一年 12 次施氮相比,一年 2 次施氮明显高估了氮沉降在降低土壤 pH和增加有效磷含量上的作用,低估了氮沉降在增加土壤有效氮含量上的作用,其中0~5 cm土层差异显著.

关键词: 土壤pH, 氮沉降, 碳、氮、磷, 温带草原

Abstract: A four-year simulated nitrogen (N) deposition experiment involving nine N gradients and two N deposition frequencies (N was added either twice yearly or monthly) was conducted in Inner Mongolian grassland, to examine the effects of frequency and intensity of N addition on pH and the contents of carbon, nitrogen and phosphorus in soil. The results indicated that the soil pH and total phosphorus content, regardless of the N addition frequency, gradually decreased with the increase of N addition intensity. By contrast, the contents of soil available nitrogen and available phosphorus showed an increasing trend, while no significant variation in dissolved organic carbon (DOC) content was observed, and the contents of soil total carbon and total nitrogen had no change. Compared with the monthly N addition, the twice-a-year N addition substantially overestimated the effects of N deposition on decreasing the soil pH and increasing the available phosphorus content, but underestimated the effects of N deposition on increasing the soil available nitrogen content, and the significant difference was found in 0-5 cm soil layer.

Key words: temperate steppe, carbon, nitrogen and phosphorus., nitrogen deposition, soil pH