土壤水分对半干旱区石灰性土壤有机碳矿化的影响

发布时间：2018-06-05 12:03

本文选题：土壤水分 + 土壤有机碳矿化　；参考：《灌溉排水学报》2017年09期

【摘要】：为明确土壤水分对我国北方半干旱区域石灰性土壤有机碳矿化的影响,采用室内恒温培育试验,以栗钙土、栗褐土、褐土为研究对象,研究了不同土壤水分条件下土壤有机碳(SOC)矿化差异。土壤含水率设置为田间持水率(WHC)的40%、70%和100%。结果表明,随着土壤含水率升高,3类土壤2种利用方式(玉米地、果园)土壤有机碳累积矿化量及矿化率增大,较高水分下的增幅(70%WHC~100%WHC)小于较低水分下的增幅(40%WHC~70%WHC);土壤有机碳矿化动态符合一级动力学方程,土壤潜在矿化碳库(Cp)为33.10~193.56 mg/kg,潜在矿化率Cp/SOC为0.41%~3.35%,Cp及Cp/SOC随土壤含水率升高而增大,Cp及Cp/SOC较高水分条件下的增幅较小;40%WHC下Cp/SOC与土壤有机碳量显著负相关,70%WHC及100%WHC下则与土壤有机碳量及黏粒量显著负相关(P0.05)。半干旱区域石灰性土壤有机碳矿化及土壤有机碳固存能力在较低水分条件下(40%WHC~70%WHC)受土壤水分变化影响较大。
[Abstract]:In order to clarify the effect of soil moisture on the mineralization of organic carbon in calcareous soils in the northern part of China, the experiment was carried out with chestnut soil, chestnut cinnamon soil and cinnamon soil as the research objects. The mineralization differences of soil organic carbon (SOC) under different soil moisture conditions were studied. The soil moisture content was set as 40% and 100% of the field water holding capacity (WHCs). The results showed that with the increase of soil moisture content, soil organic carbon accumulation and mineralization rate increased in three types of soils (corn fields, orchards). The increase of 70% WHC100 under higher water content is less than that at lower water level (40% WHC70). The mineralization dynamics of soil organic carbon conform to the first-order kinetic equation. The potential mineralized carbon pool (CP) of soil is 33.10 ~ 193.56 mg / kg, and the potential mineralization rate (Cp/SOC) is 0.41 ~ 3.35%. CP and Cp/SOC increase with the increase of soil moisture content, and the increase of Cp/SOC under higher water content of Cp/SOC is significantly negative correlation with soil organic carbon content of 70WHC and 100%WHC. Soil organic carbon and clay content were negatively correlated with P 0.05. Soil organic carbon mineralization and soil organic carbon sequestration capacity of calcareous soils in semi-arid regions were greatly affected by soil moisture changes under low water conditions.
【作者单位】：山西农业大学;中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室;
【基金】：山西省自然科学基金项目(2012011033-7) 土壤与农业可持续发展国家重点实验室开放基金课题(0812201222) 山西农业大学博士后基金项目(134849);山西农业大学引进人才科研启动项目(XB2010007)
【分类号】：S153.6

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