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微生物菌剂对芦竹修复Pb污染土壤的影响
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作者 王柯懿 陈霞霞 +2 位作者 莫凌 曾丹娟 蒲高忠 《植物资源与环境学报》 CAS CSCD 北大核心 2023年第6期43-49,共7页
为了探明微生物菌剂对芦竹(Arundo donax Linn.)修复Pb污染土壤的影响,以ETS微生物菌剂为供试微生物菌剂,将对照组(未添加微生物菌剂和Pb)、微生物菌剂单一处理组(每个水泥池200 mL微生物菌剂)、Pb单一处理组(土壤Pb终质量浓度300 mg... 为了探明微生物菌剂对芦竹(Arundo donax Linn.)修复Pb污染土壤的影响,以ETS微生物菌剂为供试微生物菌剂,将对照组(未添加微生物菌剂和Pb)、微生物菌剂单一处理组(每个水泥池200 mL微生物菌剂)、Pb单一处理组(土壤Pb终质量浓度300 mg·kg^(-1))和微生物菌剂-Pb复合处理组(每个水泥池200 mL微生物菌剂,土壤Pb终质量浓度300 mg·kg^(-1))芦竹的生长情况和光合特性以及Pb的积累和迁移特征进行比较。结果显示:Pb单一处理组芦竹的株高、分蘖数和单丛地上部干质量显著(P<0.05)低于对照组,叶绿素相对含量、净光合速率和水分利用效率与对照组差异不显著(P>0.05),气孔导度、胞间CO_(2)浓度和蒸腾速率显著高于对照组;而微生物菌剂-Pb复合处理组芦竹的株高、分蘖数、单丛地上部干质量和水分利用效率显著高于Pb单一处理组,叶绿素相对含量和胞间CO_(2)浓度与Pb单一处理组差异不显著,净光合速率、气孔导度和蒸腾速率显著低于Pb单一处理组。Pb单一处理组芦竹根和茎的Pb含量显著高于对照组,叶的Pb含量和根的Pb富集系数与对照组差异不显著,茎和叶的Pb富集系数显著低于对照组;而微生物菌剂-Pb复合处理组芦竹根和茎的Pb含量以及根、茎和叶的Pb富集系数不显著高于Pb单一处理组,叶的Pb含量显著高于Pb单一处理组。从不同器官看,Pb单一处理组芦竹根的Pb含量和Pb富集系数最高,而微生物菌剂-Pb复合处理组芦竹叶的Pb含量和Pb富集系数最高。另外,芦竹的Pb转运系数在4个处理组间差异显著,其中,Pb单一处理组芦竹的Pb转运系数最低,微生物菌剂-Pb复合处理组芦竹的Pb转运系数显著高于Pb单一处理组。研究结果显示:微生物菌剂能够促进Pb胁迫下芦竹的生长,提高芦竹的Pb吸收和转运能力,进而增强其对Pb污染土壤的修复能力。 展开更多
关键词 芦竹 微生物菌剂 PB污染土壤 植物修复
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Spatial-temporal Distribution and Influencing Factors of Urban Carbon Emissions under the Background of Carbon Emission Reduction:A Case Study of Guangxi Autonomous Region
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作者 ZHOU Xinran WANG Jinye +2 位作者 HE Wen WEI Qingqing YANG Yihui 《Journal of Resources and Ecology》 CSCD 2024年第4期870-879,共10页
Based on the panel data of Guangxi from 2005 to 2017,the spatiotemporal characteristics and determinants of urban carbon emissions in Guangxi were analyzed using the extended STIRPAT model and the Geographically and T... Based on the panel data of Guangxi from 2005 to 2017,the spatiotemporal characteristics and determinants of urban carbon emissions in Guangxi were analyzed using the extended STIRPAT model and the Geographically and Temporally Weighted Regression(GTWR)model.The main findings of our research can be summarized as follows.While the total carbon emissions of cities in Guangxi consistently increased from 2005 to 2014,the growth trend slowed after 2014,leading to a stabilization in the total emissions.In addition,there are significant differences in the total carbon emissions among the cities.The central and northeastern regions have higher emissions,while the southwestern region has lower emissions.Finally,there are variations in the degrees and directions of the impacts that factors have on carbon emissions among the different time periods and cities.Urban land use is a key factor driving carbon emissions,and it has a negative impact on most cities in Guangxi.Meanwhile,factors such as industrial structure,population urbanization,population concentration,and economic growth have significant positive effects on carbon emissions in Guangxi.The influence of urban roads on carbon emissions is generally positive,while the degree of openness to the outside world and environmental regulations has relatively weaker impacts on emissions.In summary,in order to promote the low-carbon transition of Guangxi and achieve high-quality development,the cities in Guangxi should implement differentiated urban carbon reduction strategies that are focused on optimizing urban land use and industrial structure. 展开更多
关键词 urban carbon emissions GTWR model improved SPIRPAT model influencing factor GUANGXI
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