干湿交替及凋落物对若尔盖泥炭土可溶性有机碳的影响  

Effect of Wetting-drying Cycle and Litter on Dissolved Organic Carbon in Peat Soil in Zoigê Plateau

作　　者：张雪雯[1] 莫熠 张博雅[1] 高居娟 高俊琴[1] 

机构地区：[1]北京林业大学自然保护区学院,北京100083

出　　处：《湿地科学》2014年第2期134-140,共7页Wetland Science

基　　金：国家自然科学基金项目(41071329);国家林业公益性行业科研专项项目(200804005)资助

摘　　要：干湿交替对湿地土壤可溶性有机碳（DOC）有重要影响。以若尔盖泥炭土为研究对象，设置湿处理（100％田间持水量）、干处理f60％田间持水量）和干湿交替处理3种土壤水分条件，研究泥炭土可溶性有机碳含量对3种处理以及凋落物添加的响应。结果表明，相对于干处理，干湿交替处理增加了泥炭土可溶性有机碳含量，而在持续的水分饱和条件下，泥炭土的可溶性有机碳含量最高。凋落物添加对泥炭土可溶性有机碳含量有激发效应，导致泥炭土的可溶性有机碳含量显著增加，达到峰值后缓慢下降。湿处理条件下，泥炭土的可溶性有机碳含量对凋落物添加的响应更为迅速，增加率最大，最高可达到350．5％；干湿交替处理次之，泥炭土的可溶性有机碳含量增加率最高可达156％；干处理条件下，泥炭土的可溶性有机碳含量对凋落物添加的响应强度最小，只有18％～57％。土壤水分、凋落物添加和培养时间及其交互作用都对泥炭土的可溶性有机碳含量有显著影响。Wetting-drying cycle has significant effect on the dissolved organic carbon （DOC） in the soil in the wetlands. To investigate the effect of the wetting-drying cycle on dissolved organic carbon in the soil in the presence of the litter, Carex muliensis and Carex lasiocarpa litters were added in the peat soil in Zoig~ Plateau under the treatments of two constant moistures （60% and 100% water holding capacity） or wetting-drying cy- cle. The results showed that compared to the treatment of 60% water holding capacity, the content of dis- solved organic carbon in the soil was significantly higher at the wetting-drying treatment, and the highest oc- curred in the treatment of 100% water holding capacity. Adding litter stimulated the production of the dis- solved organic carbon in the soil, which increased to its peak rapidly and then decreased slowly in all treat- ments during the incubation period. Compared to the soils without litter, the increment of the dissolved organ- ic carbon in the soil with the litter was the highest occurred in the treatment of 100% water holding capacity （350.5%）, higher occurred in the drying and wetting treatment （156%）, and 18%-57% in the treatment of 60% water holding capacity. There were significant effects of the soil water content, adding litter, incubation time and their interaction on thedissolved organic carbon content in the soil.

关 键 词：泥炭土 可溶性有机碳(DOC) 凋落物 干湿交替 若尔盖高原 

分 类 号：S152.5[农业科学—土壤学]