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中国沙漠 ›› 2021, Vol. 41 ›› Issue (2): 145-152.DOI: 10.7522/j.issn.1000-694X.2020.00105

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降水量对连古城自然保护区荒漠植被凋落物分解和氮状态的影响

高承兵1(), 常宗强2()   

  1. 1.连古城国家级自然保护区管理局,甘肃 民勤 733300
    2.中国科学院西北生态环境资源研究院,甘肃 兰州 730000
  • 收稿日期:2020-07-23 修回日期:2020-09-23 出版日期:2021-03-20 发布日期:2021-03-26
  • 通讯作者: 常宗强
  • 作者简介:常宗强(E-mail: changzq@lzb.ac.cn
    高承兵(1972—),男,甘肃民勤人,高级工程师,主要从事荒漠生态及自然保护区研究。E-mail: gcb1972@126.com
  • 基金资助:
    国家自然科学基金项目(41871092);甘肃省科技厅重点研发项目(18YF1NA015)

Effects of water input on litter decomposition and nitrogen dynamics of desert vegetation in the Liangucheng National Nature Reserve, Gansu, China

Chengbing Gao1(), Zongqiang Chang2()   

  1. 1.Managing Bureau of Liangucheng National Reserve,Minqin 733300,Gansu,China
    2.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
  • Received:2020-07-23 Revised:2020-09-23 Online:2021-03-20 Published:2021-03-26
  • Contact: Zongqiang Chang

摘要:

对连古城自然保护区不同降雨梯度(不截留和分别截留30%、50%、80%)下荒漠典型植被土壤无机氮和原位净氮矿化的凋落物分解和养分释放进行了连续的观测分析。结果表明:(1)随着水分输入减少,凋落物的分解速率减小,凋落物分解速率与年降水量正相关。与此相反,净氮矿化与降水量无关。(2)土壤NO3-浓度随着降水输入的增加而显著降低,而土壤NH4+浓度在不同降水截留处理条件下并无显著差异。(3)在连古城自然保护区,荒漠植被凋落物分解速率与实际降雨量密切相关,并且在不同控制条件下,随时间的变化凋落物中的碳和氮含量存在同时流失的现象。

关键词: 连古城自然保护区, 荒漠生态系统, 分解, 氮释放, 降水截留

Abstract:

Based on the rainfall interception experiment of four different rainfall gradients (control and three levels:interception of 30%, 50% and 80%) in Liangucheng National Nature Reserve, the litter decomposition and nutrient release of inorganic soil nitrogen and in-situ net nitrogen mineralization of typical desert vegetation were observed and analyzed in two consecutive years. The main results are: (1) With the decrease of water input, the decomposition rate of litter also decreased, and there was a positive correlation between litter decomposition rate and annual precipitation. On the contrary, net nitrogen mineralization has nothing to do with precipitation. (2) Soil NO3- significantly decreased with increasing precipitation input, whereas soil NH4+ concentration did not differ among precipitation interception treatments. (3) In Liangucheng National Nature Reserve, the decomposition rate of desert vegetation litter is closely related to the actual rainfall, and under different control conditions, the content of carbon and nitrogen in the litter changes with time.

Key words: Liangucheng National Nature Reserve, desert ecosystem, decomposition, nitrogen release, rainfall interception

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