退化草地补播草木樨、黄花苜蓿的生产力和土壤碳截获潜力  

Community productivity and soil carbon sequestration after Melilotus officinalis and Medicago falcata reseeding on degraded grassland

作　　者：李飞[1,2] 禹朴家[1] 神祥金[1,2] 宋彦涛[3] 李强[1,2] 张海艳[1,2] 周道玮[1] 

机构地区：[1]中国科学院东北地理与农业生态研究所,吉林长春130012 [2]中国科学院大学,北京100049 [3]东北师范大学,吉林长春130024

出　　处：《草业科学》2014年第3期361-366,共6页Pratacultural Science

基　　金：战略先导专项(XDA05050401);国家重点基础研究发展计划(2011CB403203)

摘　　要：通过对补播两年后的草木樨(Melilotus suaveolens)、黄花苜蓿(Medicago falcate)等5种群落的群落组成、生产力以及土壤有机碳储量的调查,分析了5种群落类型的土壤碳储量及群落生产力,探讨了补播对退化草地土壤碳截获及群落生产力的影响。结果表明,1)补播显著提高了退化草地的碳截获能力(P<0.05)。补播深根系牧草——草木樨、黄花苜蓿群落的土壤碳储量明显高于退化的芦苇(Phragmites australis)群落,而自然演替的羊草(Leymus chinensis)和轻度退化的虎尾草(Chloris virgata)群落介于二者之间,表现为芦苇<虎尾草<羊草<草木樨<黄花苜蓿;2)土壤有机碳储量和含量具有明显的垂直分布特征,且各群落之间差异明显;3)补播改善了群落组成,大大提高了群落生产力(P<0.05),其整体变化趋势为虎尾草<芦苇<羊草<黄花苜蓿<草木樨。我国草地面积大,补播可能是实现退化草地恢复和固碳功能的最经济和最具操作性的途径之一。Land usage is an important aspect for human influence on carbon process. The impact of land usage on the sequestration of carbon is one of the most important domains to global change research. The main objective of this study was to identify the effects of reseeding on soil carbon sequestration in degraded grassland. The effects of reseeding on community composition, community productivity and soil carbon sequestration in the degraded grassland were discussed. Carbon storage and productivity significantly increased （P〈0.05） in reseeding community compared with degraded community. The carbon storage of reseeding community increased in the followding order： Phragmites australis〈Chloris virgata〈Leymus chinensis〈Melilotus suaveolens〈Medicago falcate. The productivity of different reseeding community increased with the following order： C.virgata〈P.australis〈M.falcate〈L.chinensis〈M.suaveolens. Soil organic carbon was vertical distribution in the profile of soil which decreased with the depth increased. There was significant difference between communities. Our results suggested that reseeding increased the productivity of the degrade grassland and the soil carbon storage. The study demonstrated that reseeding was a valuable and feasible approach to improve the carbon sequestration of degraded grassland.

关 键 词：退化草地 补播 深根系 垂直分布 碳截获 

分 类 号：S812.68[农业科学—草业科学]