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Responses of soil nutrients and microbial communities to three restoration strategies in a karst area, southwest China

机译:西南喀斯特地区土壤养分和微生物群落对三种恢复策略的响应

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摘要

Ecological restoration is widespread in the karst region, southwest China, but the impacts of different restoration strategies on soil fertility indices have rarely been compared. Here soil nutrients and microbial communities were measured 16 years after agricultural abandonment in a karst area, southwest China. Three restoration strategies were included, i.e., ⅰ) restoration with an economic tree species Toona sinensis (TS), ⅱ) restoration with Guimu-1 hybrid elephant grass (GG), ⅲ) restoration with a combination of Zenia insignis and Guimu-1 hybrid elephant grass (ZG). Cropland under maize-soybean rotation (CR) was used as reference. Soil organic carbon level was more than doubled in TS, and that in GG and ZG was elevated by about 50% relative to CR, Soil total nitrogen concentration in GG was not significantly different from CR, but that in TS and ZG was increased by 93% and 55% relative to CR, Similar to nitrogen, soil total phosphorus concentration in GG was not changed relative to CR, but that in TS and ZG were significantly increased. Microbial biomass carbon and nitrogen concentrations were significantly increased in TS and GG by 124% and 82%, respectively, compared to CR, but those in ZG and CR were similar. The abundance of total PLFAs (phospholipid fatty acids) was significantly increased by 55-69% following agricultural abandonment, and there was no significant difference among the three restoration strategies. The patterns of the other microbial groups and the ratio of fungal to bacterial (F:B) PLFAs were largely similar to that of total PLFAs. Soil organic carbon was identified as the primary factor affecting the abundance of soil microbial communities. Our findings suggest that the three restoration strategies, particularly TS are efficient in improving soil fertility.
机译:生态恢复在中国西南喀斯特地区普遍存在,但很少比较不同恢复策略对土壤肥力指数的影响。在中国西南喀斯特地区农业弃耕16年后,对土壤养分和微生物群落进行了测量。包括三种恢复策略,即ⅰ)经济树种Toona sinensis(TS)的恢复,ⅱ)Guimu-1杂种象草(GG)的恢复,ⅲ)Zenia insignis和Guimu-1杂种的恢复象草(ZG)。以玉米-大豆轮作(CR)下的农田为参考。 TS的土壤有机碳水平增加了一倍以上,GG和ZG的土壤有机碳含量相对于CR升高了约50%,GG中的土壤总氮浓度与CR并无显着差异,但TS和ZG的土壤总氮浓度增加了93相对于CR分别为5%和55%,与氮相似,GG中的土壤总磷浓度相对于CR不变,但TS和ZG中的土壤总磷浓度却显着增加。与CR相比,TS和GG中的微生物生物量碳和氮浓度分别显着增加了124%和82%,但ZG和CR中的相似。农业废弃后,总PLFA(磷脂脂肪酸)的丰度显着增加了55-69%,并且三种恢复策略之间没有显着差异。其他微生物组的模式以及真菌与细菌(F:B)PLFA的比例与总PLFA的相似。土壤有机碳被确定为影响土壤微生物群落丰富度的主要因素。我们的发现表明,三种恢复策略,特别是TS,可以有效提高土壤肥力。

著录项

  • 来源
    《Journal of Environmental Management》 |2018年第1期|456-464|共9页
  • 作者单位

    Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China,Huanjiang Observation and Research Station for Karst Ecosystems, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Huanjiang 547100, Guangxi, China;

    Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China,Huanjiang Observation and Research Station for Karst Ecosystems, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Huanjiang 547100, Guangxi, China,College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China,Huanjiang Observation and Research Station for Karst Ecosystems, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Huanjiang 547100, Guangxi, China;

    Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China,Huanjiang Observation and Research Station for Karst Ecosystems, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Huanjiang 547100, Guangxi, China;

    Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China,Huanjiang Observation and Research Station for Karst Ecosystems, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Huanjiang 547100, Guangxi, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Soil organic carbon; Soil total nitrogen; Soil total phosphorus; Soil microbial biomass; Karst region; Ecological restoration;

    机译:土壤有机碳;土壤总氮;土壤总磷;土壤微生物生物量;喀斯特地区;生态修复;
  • 入库时间 2022-08-17 13:31:52

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