生态学报2017，Vol.37Issue(2)：367-377,11.DOI:10.5846/stxb201508031635
若尔盖沙化草地不同生态恢复模式土壤活性有机碳及碳库管理指数变化
Effects of different ecological restoration patterns on labile organic carbon and carbon pool management index of desertification grassland soil in zoige
摘要
Abstract
The changes of soil labile organic carbon and Carbon pool management index (CMPI) under different ecological restoration patterns can provide valuable information for evaluating the effects of ecological restoration measures on soil quality improvement,and screening optimized ecological restoration patterns on desertification forest and grassland.In this study,soil labile organic carbon fractions and CPMI were investigated by applying field investigations and laboratory analyses to desertification grassland receiving different patterns of ecological restoration in Zoige.Three main ecological restoration patterns were used to control desertification of grassland in Zoige,including shrub-grass intercrop pattern Ⅰ (stripe Tamarix ramosissima incteropping herbs,such as Poa pratensis,Elymus nutan and Ajuga lupulina,SGⅠ),shrubgrass intercrop pattern Ⅱ (circular Tamarix ramosissima incteropping herbs,such as Poa pratensis,Cremanthodium reniforme,Cirsiumjaponicum,Daucus carota and Vicia sepium,SGⅡ),and the sand-barrier plus shrub-grass intercrop pattern (the sand-barriers of Tamarix ramosissima plus Tamarix ramosissima incteropping herbs,such as Tamarix ramosissima,Poa pratensis,Elymus nutan,Ajuga lupulina,Daucus carota,SBSG).The results showed that the values of soil organic carbon and its labile fractions contents were higher in the three ecological restoration grasslands than in the desertification grassland without ecological restoration measures (DG).Compared to the DG,the contents of soil microbial biomass carbon (MBC),dissolved organic carbon(DOC),easily oxidized organic carbon (EOC),and particulate organic carbon(POC) in whole profile under the SGⅠ pattern were increased by 36.6％,139.0％,89.4％,130.9％,respectively,and those in the SGⅡ pattern were increased by 2.7％,-43.9％,15.0％,49.7％,respectively,and those in the SBSG pattern were increased by 82.4％,21.8％,56.2％,170.3％,respectively.This indicated that the ecological restoration patterns of SGⅠ and SBSG were similarly effective at improving soil organic carbon,and both were superior to the SGⅡ pattern.The distributed proportions of soil active organic carbon between the three ecological restoration and desertification grassland were difference,for instance the distributed proportion of DOC presented a vertical fractionation in the SGⅠ pattern.The values of CPMI under three ecological restoration patterns were exceeded 100％.This implied that soil quality can be improved by the three ecological restoration patterns,and the order of the improved level was SGⅠ (CPMI,182.5％) ＞ SGⅡ (CPMI,157.1％) ＞ SBSG (CPMI,129.9％).The results suggest that soil easily oxidized organic carbon can be used as an optimized index to reflect changes of soil quality in different ecological restoration grasslands,and soil CPMI can be used to characterize the improved effectiveness of ecological restoration measures on soil quality.关键词
若尔盖/沙化草地/生态恢复/土壤/活性有机碳/碳库管理指数Key words
Zoige/desertification grassland/ecological restoration/soil/labile organic carbon/carbon pool management index引用本文复制引用
蒲玉琳,叶春,张世熔,龙高飞,杨丽蓉,贾永霞,徐小逊,李云..若尔盖沙化草地不同生态恢复模式土壤活性有机碳及碳库管理指数变化[J].生态学报,2017,37(2):367-377,11.基金项目
四川省教育厅资助项目(14ZB0011) （14ZB0011）
国家自然科学基金资助项目(41401328) （41401328）
四川省科技支撑计划资助项目(2014NZ0044) （2014NZ0044）
