摘要
选取荒石滩地4种重构土体作为研究对象,应用土壤碳通量测量系统(LI-8100),对重构土体土壤呼吸和水热影响因子进行原位监测,分析了重构土体土壤呼吸的日变化情况。结果表明,4种重构土体土壤呼吸在观测期间的日变化均呈现单峰曲线,最低值出现在6∶00或20∶00,最高值出现在10∶00、12∶00或14∶00。4种重构土体土壤呼吸值在8月份和12月份分别达到试验观测期间最大值和最小值,其中,添加蛭石、页岩、沙和砒砂岩重构土体的最大值分别为9.88、10.47、14.94μmol·m^-2·s^-1和12.19μmol·m^-2·s^-1,最小值分别为0.11、0.08、0.10μmol·m^-2·s^-1和0.00μmol·m^-2·s^-1,4种重构土体日变化幅度的排序为添加沙>页岩>砒砂岩>蛭石。4种重构土体土壤温度(指数模型)、土壤体积含水量(二次曲线模型)单因素以及土壤温度和含水量双因素(幂-指数模型)均能够解释土壤呼吸的日变化,但是解释能力不同,双因素模型解释能力一般高于50.0%,单因素模型中温度的解释能力显著高于水分;3种模型拟合下,添加蛭石重构土体水热影响因子对土壤呼吸日变化的解释能力最低,为77%~97%,指数模型和幂-指数模型下添加蛭石的重构土体土壤水热影响因子对土壤呼吸日变化的解释能力最低,分别为41%~96%和77%~97%,二次曲线模型模拟下添加页岩重构土体土壤体积含水量对土壤呼吸日变化的解释能力最高,为28%~53%。
Four kinds of reconstructed soil mass in the barren beach were selected as the research objects.The soil carbon flux measurement system(LI-8100)was used to monitor the soil respiration and hydrothermal factors of the reconstructed soil mass in situ,and the seasonal respiration changes of the reconstructed soil mass and its components were analyzed.The results showed that the daily changes of soil respiration for the four reconstructed soil masses showed a single-peak curve,and the patterns of daily changes for soil respiration were basically the same.The lowest value during the observation period appeared at 6∶00 or 20∶00,and the highest value appeared at 10∶00,12∶00,or 14∶00.The soil respiration values of the four reconstituted soil masses reached the maximum and minimum values during the experimental observation period in August and December,respectively,and the daily variation range of the four reconstituted soil masses during the observation period.Among them,the maximum values of reconstructed soil masses with meteorite,shale,sand,and soft rock were 9.88,10.47,14.94,and 12.19μmol·m^-2·s^-1,respectively,the minimum values were 0.11,0.08,0.10,and 0.00μmol·m^-2·s^-1.The order was as sand>shale>soft rock>meteorite.The four factors of soil temperature(index model),soil volume water content(quadratic model),soil temperature,and water content(power-index model)can explain the daily variation of soil respiration.However,the explanatory power was different,the explanatory power of the two-factor model was generally higher than 50.0%,and the interpretation ability of temperature in the single factor model was significantly higher than that of water.Under the fitting of three kinds of models,the hydrothermal influence factor of the addition of meteorite to reconstruct the soil mass had the lowest ability to interpret the diurnal variation of soil respiration(77%~97%).Under the exponential model and the power-exponential model,the soil hydrothermal influence factor of the addition of meteorite to reconst
作者
张剑
雷娜
ZHANG Jian;LEI Na(School of Environmental Science and Engineering,Chang'an University,Xi’an,Shaanxi 710064,China;Shaanxi Provincial Land and Engineering Construction Group Co.,Ltd,Xi’an,Shaanxi 710075,China;Institute of Soil and Water Conservation,Northwest A&F University,Yangling,Shaanxi 712100,China)
出处
《干旱地区农业研究》
CSCD
北大核心
2020年第2期251-257,共7页
Agricultural Research in the Arid Areas
基金
陕西省土地工程建设集团内部项目(DJNY2019-20)。
关键词
土壤呼吸
重构土体
水热因子
日变化
soil respiration
reconstituted soil masses
hydrothermal factor
diurnal variation
