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土壤呼吸有着明显的时间变异,呈现小时、日、季节、年际的变化,对土壤呼吸制定最佳的监测频率非常必要.为选取土壤呼吸的最佳监测频率,以太岳山油松人工林为研究对象,于2011-2012年5-10月测定土壤呼吸速率的动态变化,以每周2次(天)的观测数据作为长期定位观测土壤呼吸速率的数据(CK),依此区划为不同监测频率:每周1次(SF2)、每两周1次(SF4)、每月1次(SF8),并分析不同监测频率的土壤呼吸速率与对照相比产生的偏差以及对生长季土壤呼吸速率值的估计概率.结果显示:油松人工林土壤呼吸速率季节变化明显,9:00-11:00土壤呼吸值与24 h日平均土壤呼吸值相关性最大(R2=0.978).降低监测频率使土壤呼吸速率与土壤温湿度的拟合效果(R2)以及土壤呼吸速率对温度的敏感性指数Q10的波动范围呈扩大趋势.随着监测频率的降低,所测的土壤呼吸速率与对照的离散程度呈增大趋势.在给定精度下,随着监测频率的降低,所测的土壤呼吸速率对生长季土壤呼吸速率值估计概率呈下降趋势,2011、2012、2011-2012年SF2在5%精度下估计概率均为100%,而SF4在5%的精度下估计概率分别为50%、75%、100%,SF8则在5%的精度下估计概率依次为50%、62.5%、87.5%.研究表明,整个生长季可使用9:00-10:00作为土壤呼吸速率测定代表性时段;对于单年观测期每周1次(天)的监测频率可以得到可靠的生长季土壤呼吸估算量(与对照相比偏差<5%),而对于两年观测期每两周1次(天)的监测频率可以得到可靠的生长季土壤呼吸估算量(与对照相比偏差<5%).本研究结果为准确测定土壤呼吸并减少工作量提供了方法和依据.
It is very necessary to establish the best monitoring frequency for soil respiration in order to select the best monitoring frequency of soil respiration and to study the Pinus tabulaeformis plantation , The dynamic change of soil respiration rate was measured from May to October in 2011-2012, and the data of soil respiration rate (CK) observed by long-term positioning were taken as 2 times (days) per week as the data of different monitoring frequencies (SF2), once every two weeks (SF4), once a month (SF8), and analyzed the deviation of soil respiration rate from the control at different monitoring frequency and the effect on the soil respiration rate The results showed that the soil respiration rate of Pinus tabulaeformis plantation changed obviously in the seasons, and the correlation between the soil respiration value at 9: 00-11: 00 and the average soil respiration value at 24 h was the highest (R2 = 0.978) The fitting effect of respiration rate and soil temperature and humidity (R2) and the range of fluctuation of soil respiration rate and temperature sensitivity index Q10 showed an increasing trend.With the decrease of monitoring frequency, the measured soil respiration rate and the control dispersion Increase trend At a given accuracy, with the decrease of monitoring frequency, the estimated probability of soil respiration rate measured during the growing season showed a decreasing trend, and the estimated probability of SF2 at 5% accuracy in 2011, 2012 and 2011-2012 was Is 100%, while SF4 is estimated to be 50%, 75%, 100% respectively at 5% accuracy and SF8 is 50%, 62.5%, 87.5% at 5% accuracy.The research shows that the whole The growing season may use 9: 00-10: 00 as a representative period of soil respiration rate measurement; a reliable estimate of growing season soil respiration may be obtained for monitoring frequency of 1 (day) per week in a single year of observation (compared to controls (<5% deviation), and a reliable estimate of growing season soil respiration (<5% deviation from control) was obtained for each biweekly biweekly (two days) monitoring frequency in the two-year observation period.The results of this study were accurate Soil respiration and reduce the workload provided the method and basis.