煤矸石充填重构土壤剖面温度变化对覆土厚度的响应

发布时间：2018-05-14 04:28

  本文选题：重构土壤 + 土壤温度　； 参考：《煤炭学报》2017年12期

【摘要】：为探究不同覆土厚度煤矸石充填重构土壤剖面温度变化及其对表层土壤微生物量碳(MBC)含量和土壤呼吸的影响,根据覆土厚度将研究区分为A(15~40 cm),B(40~60 cm),C(60~80 cm)和D(80~100 cm)4类监测区,分别测定重构土壤0~120 cm土壤层温度和表层土壤呼吸速率,并采集表层土壤测定其MBC的含量。结果表明:监测区表层土壤(5 cm)日最高温度和温度变幅均呈ABDC,监测区A和B年均温度要比C和D高出1℃左右。矸石层的存在会影响表层0~20 cm土壤温度的日变幅,并且随着覆土厚度的增加,表层土壤温度日变幅逐渐减小。当覆土厚度大于80 cm时,土壤层的温度变化几乎不受矸石层的影响。随着太阳辐射的增加,矸石层对土壤层温度的影响也会增强,并且随着覆土厚度的增加,矸石层对土壤层温度的影响会逐渐削弱。Tc值(矸石层对表层土壤的温度影响系数)能够准确地定量分析矸石层对土壤层温度的影响并估算重构土壤的覆土厚度。重构土壤表层土壤MBC含量与温度无显著相关性,覆土厚度过薄或过厚均不利于MBC的累积,当覆土厚度在60~80 cm时最有利于表层土壤MBC的累积,其年均MBC含量为83.46 mg/kg。重构土壤呼吸速率与土壤温度呈显著正相关,但不同覆土厚度重构土壤呼吸速率的差异主要是由矸石层引起,并且矸石层对重构土壤的影响随着覆土厚度的增加逐渐减小。
[Abstract]:In order to study the temperature change of the reconstructed soil profile with different thickness of coal gangue and its effect on the content of microbial biomass MBCs and soil respiration in the surface soil, the study was divided into two monitoring areas, namely, AH1540cm ~ (40) ~ (60) cm ~ (-1) (C ~ (6080) ~ (80) cm) and D _ (80) ~ (100) cm)4 monitoring area, according to the thickness of the covered soil. The soil temperature and the respiration rate of the surface soil were measured, and the MBC content of the surface soil was measured. The results showed that the maximum daily temperature and temperature variation of surface soil in the monitoring area were both ABDC.The average annual temperature of A and B in the monitoring area was about 1 鈩，

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