摘要
生物学肥力是土壤肥力的重要构成部分,能够指示生态恢复措施下沙化草地的土壤质量变化。以围栏禁牧草本模式(enclosure plus grass,EG)、围栏禁牧灌草间作模式(enclosure intercropping shrub-grass,ESG)和围栏禁牧沙障+灌草间作模式(enclosure plus sand-barrier and shrub-grass,ESSG)3种恢复地为研究对象,以未恢复的沙化草地(desertification grassland without restoration,CK)为对照,采用调查采样法、综合评价法研究生态恢复措施及年限对沙化草地土壤微生物数量、微生物生物量及酶活性的影响。结果表明,3种恢复模式提高了沙化草地土壤中各项生物学肥力指标,ESSG模式下土壤质量的恢复效果最优,生物学肥力指数(biological fertility index,BFI)分别显著高出EG和ESG模式41.5%和43.1%(P<0.05)。EG和ESG模式下,土壤各项生物学肥力指标随恢复年限的增加而增加,≤5、7～9和≥15a恢复地的BFI值均显著高于未恢复地(0年)(P<0.05),且≥15a的恢复地又显著高于≤5和7～9a恢复地(P<0.05)。因此,在本研究的时间范围内,时间越长生态措施下土壤质量的恢复效果越好,但其最佳恢复期有待进一步研究确定。
Soil biological fertility is sensitive to environmental changes and plays a vital role in soil fertility,which is often used as an important indicator to assess soil quality and to indicate the effect of ecological restoration on desertified grassland.This study aimed to evaluate soil biological fertility by analyzing soil microorganisms,microbial biomass C and N,enzyme activities,and biological fertility index(BFI)of grassland restoration in Zoige.The patterns of grassland restoration studied were,enclosure plus grass pattern(EG),enclosure intercropping shrub-grass pattern(ESG),and enclosure plus sand-barrier,shrub-grass pattern(ESSG).Three restoration durations under EG and ESG,including≤5 a,7~9 a,and≥15 a,were studied.The results showed that soil biological fertility of the three types of restoration grasslands improved when compared to desertified grassland without restoration,and their differences were significant.Meanwhile,the soil biological fertility index(BFI)of ESSG pattern was significantly higher than EG by 41.5%and ESG by 43.1%(P<0.05).Hence,ESSG is the best pattern for restoring desertified grassland and may be applied widely.Within the time range of this study,the soil biological fertility increased with increasing in years of restoration,under EG and ESG patterns.The BFI value of≤5 a,7~9 a and≥15 a grassland restoration were significantly higher than that of grasslands without restoration(P<0.05),while that of≥15 a restoration grassland was distinctly higher than that of≤5 a and 7~9 a(P<0.05).Further research is needed to identify the best duration of ecological restoration.Therefore,effective management practices are undertaken to maintain grassland productivity.
作者
胡嗣佳
胡容
蒲玉琳
王奥博
向双
龙高飞
张世熔
贾永霞
徐小逊
HU Sijia;HU Rong;PU Yulin;WANG Aobo;XIANG Shuang;LONG Gaofei;ZHANG Shirong;JIA Yongxia;XU Xiaoxun(College of Resources,Sichuan Agricultural University,Chengdu 611130,Sichuan,China;CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041,Sichuan,China;Chengdu Hydrogeological and Engineering Geological Team,Sichuan Bureau of Geology and Mineral Resources Exploration,Chengdu 610072,Sichuan,China;College of Environment,Sichuan Agricultural University,Chengdu 611130,Sichuan,China)
出处
《草业科学》
CAS
CSCD
2018年第11期2550-2560,共11页
Pratacultural Science
基金
中国科学院开放基金(kxysws1606)
四川省教育厅项目(14ZB0011)
国家自然科学基金(41401328)
关键词
若尔盖
沙化草地
修复模式
恢复年限
生物学肥力
Zoige
desertification grassland
restoration pattern
restoration age
biological fertility
