冻融时黑土耕层土壤活性有机碳响应特征  

Response Characteristics of Soil Labile Organic Carbon in Plough Layer of Black Soil under Simulated Freeze-thaw Conditions

作　　者：庄海艳 单博[1] 陈祥伟[1] Zhuang Haiyan;Shan Bo;Chen Xiangwei(Northeast Forestry University,Harbin 150040,P.R.China)

机构地区：[1]东北林业大学,哈尔滨150040

出　　处：《东北林业大学学报》2018年第6期77-80,共4页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(41271293);国家林业公益性行业科研专项(201404202)

摘　　要：以典型黑土区耕层土壤作为研究对象,采用室内模拟冻融的方法,研究了冻融循环次数(0、3、12次)与土壤含水量(自然含水量、饱和含水量)对土壤活性有机碳组分即可溶性有机碳(DOC)、易氧化有机碳(ROC)、颗粒有机碳(POC)、微生物量碳(MBC)、轻组有机碳(LFOC)和可矿化碳(PMC)的影响。结果表明,虽然饱和含水量处理条件下多次冻融能够显著增加MBC质量分数(P<0.05),但冻融对土壤活性有机碳组分的影响主要是通过自然含水量条件下,显著提高PMC、DOC和ROC的质量分数(P<0.05),分别较未冻融处理提高了33.3%、67.9%和68.7%。少次冻融会增加黑土耕层土壤活性有机碳的质量分数,较高的水分条件不利于活性有机碳的积累。The surface soil in typical black soil area was chosen as subject samples, by the method of indoor simulation freeze-thaw, we analyzed the influence of freeze-thaw cycles （0, 3, and 12 times） and soil water content （natural moisture content, saturated water content） on soil active organic carbon component which is dissolved organic carbon （DOC）, readily oxidation organic carbon （ROC）, particulate organic carbon （POC）, microbial biomass carbon （MBC）, light faction organic carbon （LFOC） and potential mineralized carbon （PMC）. The results showed that, although multiple freeze-thaw cycles can significantly increase the MBC content （P〈0.05） under saturated water content, the effect of freeze-thaw on soil active organic carbon composition mainly by significantly increasing the content of PMC, DOC and ROC content （P〈0.05） under natural water content condition, increased by 33.3%, 67.9% and 68.7%, respectively, compared to unfreeze-thawed treatment. It is concluded that less freeze-thaw cycles can increase the content of the active organic carbon in the top soil black soil, and higher water content conditions are not beneficial to the accumulation of active organic carbon.

关 键 词：黑土 冻融次数 前期含水量 活性有机碳 微生物量碳 

分 类 号：S153.6[农业科学—土壤学]