水利水电技术2018，Vol.49Issue(4)：90-98,9.DOI:10.13928/j.cnki.wrahe.2018.04.014
季节性冻融期间五台山典型植被土壤氮矿化特征
Soil nitrogen mineralization characteristics of typical vegetations of Wutai Mountain during seasonal freeze-thaw period
摘要
Abstract
Aiming at the impacts from climate warming and change of seasonal soil freeze-thaw pattern on the process of the soil nitrogen mineralization in alpine region,the soil nitrogen mineralization characteristics of the typical vegetation communities near the timberline of Wutai Mountain,such as meadow(CD),Larix principis-rupprechtii(HL),Picea meyeri(YS),etc.,are studied herein with the in-situ soil cultivation method.The result shows that the contents of NH4+ of all the communities are larger than those of NO3-.The total amount of the soil mineral nitrogen content(NH4+ + NO3-) of CD decreases in the onset of freezing period,increases in the deep freezing period,decreases in the thawing period and increases in the growing season.The total amounts of the soil mineral nitrogen contents of HL and YS decrease in the onset of freezing period and increase all along from the deep freezing period to the growing period.The net rates and amounts of the soil nitrogen mineralization of all the communities increase in the deep freezing period,decrease in the thawing period and increase in the growing period.No obvious differences are all along there between the total amounts of the soil mineral nitrogen and the net rates and amounts of the soil nitrogen mineralization of both HL and YS,while significant differences are there between CD and HL(p ＜0.05) and YS(p ＜0.05).The net rates and amounts of soil nitrogen mineralization of all the communities in the seasonal freeze-thaw period are lower than those in the growing period,but significant mineralizations exhibit as well.During the whole cultivation period (from freeze-thaw period to growing season),the nitrogen supply capability of HL is strongest,YS is the secondary and CD is the weakest.The freeze-thaw cycle can promote the soil nitrogen mineralization and increase the content of soil mineral nitrogen,thus provide the essential nutrients for the growth of plant in spring;however,this process also increases the risk of nutrients loss from soil.The study result provides a reference for the study on the soil nitrogen mineralization of ecosystem of alpine region.关键词
冻融循环/氮矿化/高山林线/高山/亚高山区/土壤冻融过程/水土保持/高寒生态系统氮循环/全球气候变化Key words
freeze-thaw cycle/nitrogen mineralization/alpine timberline/alpine/subalpine region/soil freezing and thawing process/water and soil conservation/nitrogen cycle in alpine ecosystem/global climate change分类
农业科技引用本文复制引用
赵志宏,刘楠,李殿民,李古月..季节性冻融期间五台山典型植被土壤氮矿化特征[J].水利水电技术,2018,49(4):90-98,9.基金项目
国家自然科学基金项目“基于水文过程和冻融循环的高山植被土壤氮动态研究”(31400618) （31400618）
国家自然科学基金项目“土壤冻融过程的东北黑土区切沟发育机理”(41201265) （41201265）
国家自然科学基金项目“季节性冻融期土壤蒸发规律的试验及模拟研究”(41572239) （41572239）
国家自然科学基金项目“季节性冻融期浅层潜水与土壤水转化规律的试验研究”(41502243) （41502243）
