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宁南山区植被恢复对土壤团聚体养分特征及微生物特性的影响 被引量:1

Effects of vegetation restoration on nutrient and microbial properties of soil aggregates with different particle sizes in the loess hilly regions of Ningxia,Northwest China
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摘要 测定了宁夏黄土丘陵区植被恢复近30年的天然草地和农地不同粒径团聚体的土壤养分含量、微生物生物量、呼吸特性和生态化学计量比等指标,探索黄土丘陵区植被恢复对不同粒径土壤团聚体的养分特性和微生物学性质的影响.结果表明:微团聚体(粒径<0.25 mm)质量百分比、各粒径土壤团聚体养分(有机碳、全氮、速效钾)含量、C/N均表现为天然草地大于农地,其中1~2 mm粒径团聚体有机碳、全氮含量在天然草地和农地中均最高,C/N也较高,说明植被恢复能有效促进土壤团粒的形成,适宜养分积累和有机碳的汇集,且在1~2 mm粒径团聚体上表现最为突出;天然草地各粒径土壤团聚体微生物生物量(碳、氮)、基础呼吸强度均高于农地,而呼吸熵低于农地,可见植被恢复措施可有效提高各粒径土壤微生物生物量与活性,并使土壤生境趋于稳定;但由于养分特性的差异,不同粒径团聚体微生物特性对植被修复的响应存在差异,其中天然草地土壤1~2 mm粒径团聚体微生物生物量碳,<0.25、0.25~1、1~2 mm粒径团聚体微生物生物量氮,以及1~2、>5 mm粒径团聚体基础呼吸强度显著高于其他粒径,即上述粒径团聚体的微生物生物量和微生物活性在植被恢复过程中逐渐被改善.表明宁南山区植被恢复有效改善了土壤团聚体的肥力状况与结构特征,且1~2 mm粒径团聚体的改良效果最为突出. We explored the effects of vegetation restoration on the soil nutrients and microbial properties of soil aggregates with different particle size by comparing soils in a natural grassland which had been restored for nearly 30 years and in cropland in the loess hilly regions of Ningxia.We analyzed the soil organic carbon(SOC),total nitrogen(TN),microbial biomass carbon(MBC),microbial biomass nitrogen(MBN),soil basal respiration(CO2-C)and respiratory quotient(q CO2)of different particle size soil aggregates collected from cropland and natural grassland.The results showed that soil aggregates of natural grassland had more micro-aggregates(particle size<0.25 mm),higher nutrient concentrations(SOC,TN and available K)and C/N than that of cropland.The highest concentrations of SOC and TN in 1-2 mm aggregates and higher C/N in natural grassland and cropland suggested that vegetation restoration could improve the capacity of soil aggregates to reduce nutrient loss and accumulate organic matter,with the highest nutrient accumulation in 1-2 mm aggregates.Microbial biomass(MBC,MBN)and CO2-C in natural grassland were higher than in cropland,but the q CO2 was significantly lower,suggesting that vegetation restoration could effectively improve soil microbial biomass and activity,and make soil habitats more stable.The magnitude of responses of the microbial characteristics of different particle aggregates to vegetation restoration varied due to the differences in nutrient characteristics.The MBC of 1-2 mm aggregates,the MBN of<0.25 mm,0.25-1 mm and 1-2 mm aggregates,the microbial activity of1-2 mm and>5 mm aggregates were more sensitive than the rest of the particle aggregates of vegetation restoration.In conclusion,vegetation restoration could effectively improve the fertility and structural characteristics of soil aggregates,and the most prominent improvement was in 1-2 mm particle size aggregates.
作者 李秋嘉 薛志婧 周正朝 LI Qiu-jia;XUE Zhi-jing;ZHOU Zheng-chao(School of Geographical Science and Tourism,Shaanxi Normal University,Xi’an 710119,China;Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,Shannxi,China)
出处 《应用生态学报》 CAS CSCD 北大核心 2019年第1期137-145,共9页 Chinese Journal of Applied Ecology
基金 国家重点研发计划项目(2017YFC0504702) 国家自然科学基金项目(41807060,41501290) 中国科学院水利部水土保持研究所重点实验室开放基金(A314021402-1707)资助.
关键词 土壤团聚体 土壤养分 微生物生物量 土壤呼吸 植被恢复 soil aggregate soil nutrient microbial biomass soil respiration vegetation restoration
作者简介 李秋嘉,男,1994年生,硕士研究生.主要从事水土保持效益评价研究.E-mail:erostcate@foxmail.com;通讯作者:薛志婧.E-mail:xue1986@snnu.edu.cn.
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