主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

气象与环境学报 ›› 2017, Vol. 33 ›› Issue (5): 76-81.doi: 10.3969/j.issn.1673-503X.2017.05.010

• 论文 • 上一篇    下一篇

不同土壤水分控制对东北地区玉米农田土壤呼吸的影响

吕国红, 温日红, 谢艳兵, 王笑影   

  1. 中国气象局沈阳大气环境研究所, 辽宁 沈阳 110166
  • 收稿日期:2015-12-16 修回日期:2017-01-13 出版日期:2017-10-30 发布日期:2017-10-30
  • 通讯作者: 王笑影,E-mail:wangxy_0917@qq.com。 E-mail:wangxy_0917@qq.com
  • 作者简介:吕国红,女,1977年生,副研究员,主要从事生态气象研究,E-mail:ghlvme@163.com。
  • 基金资助:
    国家自然科学基金项目(31501215)和中央级公益性科研院所基本科研业务费专项(2016SYIAEZD2)共同资助。

Effects of water controls at different levels on soil respiration characteristics of maize farmland in Northeast China

LÜ Guo-hong, WEN Ri-hong, XIE Yan-bing, WANG Xiao-ying   

  1. Institute of Atmospheric Environment, Shenyang, China Meteorological Administration, Shenyang 110166, China
  • Received:2015-12-16 Revised:2017-01-13 Online:2017-10-30 Published:2017-10-30

摘要: 基于锦州地区土壤水分控制试验,研究不同土壤水分条件(土壤相对湿度分别为86%、96%和105%)对东北地区玉米农田土壤呼吸的影响,分析不同土壤水分条件下玉米农田土壤温度对土壤呼吸速率的影响。结果表明:2013年锦州地区玉米农田不同土壤水分控制影响土壤呼吸速率的大小,同时间不同土壤水分控制条件下玉米农田的土壤呼吸速率均随土壤相对湿度的增加而降低(土壤相对湿度86% < 土壤相对湿度96% < 土壤相对湿度105%)。锦州地区玉米农田土壤呼吸的日动态和季节动态变化趋势均不受土壤水分的影响,均呈单峰型,其中土壤呼吸速率日最大值出现在11-14时,土壤呼吸速率季最大值出现在8月。不同土壤水分控制影响玉米农田土壤呼吸对土壤温度的敏感性,土壤呼吸的日动态变化与10 cm土壤温度的日动态变化存在时间滞后性,8月和9月土壤温度最大值较土壤呼吸最大值滞后5-6 h。不同土壤水分条件下玉米农田土壤呼吸速率与10 cm、15 cm、30 cm和45 cm土壤温度均呈显著或极显著的正相关关系,其中土壤呼吸速率与45 cm土壤温度相关性最高。2013年锦州地区不同土壤相对湿度条件下(86%、96%和105%),玉米农田的土壤呼吸速率与45 cm土壤温度均呈指数函数关系,土壤相对湿度为86%、96%和105%时的土壤温度敏感性指数Q10分别为1.92、2.20、1.72。

关键词: 土壤呼吸, 土壤水分, 土壤温度, 土壤温度敏感性指数, 玉米农田

Abstract: Based on soil water controlling experiment conducted in Jinzhou in 2013,the effects of soil moisture and soil temperature on soil respiration of maize farmland in northeast China were investigated under three levels of soil relative water contents (SRW) of 86%,96%,and 105%,respectively.The results indicated that the intensity of soil respiration is influenced by soil moisture condition.Specifically,soil respiration rate decreases with the increasing SRW.Meanwhile,the diurnal pattern and the seasonal dynamic are not impacted by SRW and both show a variation trend of the one-peak curve.The daily and annual maximums of soil respiration rates appear at 11:00-14:00 and in August,respectively.The sensibility of soil respiration to soil temperature in maize farmland is affected by the different levels of soil water controls,which is represented as the daily dynamic of soil temperature at the soil depth of 10 cm lagging behind that of soil respiration and a 5-6 hour lagging of the daily maximum soil temperature relative to the daily maximum soil respiration in August and September.In addition,the positive correlations between soil temperature at the soil depth of 10 cm,15 cm,30 cm,45 cm and soil respiration are respectively significant or extremely significant under different soil moisture conditions and soil respiration has the highest correlation with soil temperature at the soil depth of 45 cm.Besides,under the SRW of 86%,96%,and 105%,soil respiration shows an exponential relationship with soil temperature at the soil depth of 45 cm and soil temperature sensibility indices i.e.Q10 are 1.92,2.20 and 1.72 in the studied area in 2013,respectively.

Key words: Soil respiration, Soil water controls, soil temperature, soil temperature sensibility index, Maize farmland

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