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首页> 外文期刊>Environmental Monitoring and Assessment >Changes in soil organic carbon and total nitrogen in croplands converted to walnut-based agroforestry systems and orchards in southeastern Loess Plateau of China
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Changes in soil organic carbon and total nitrogen in croplands converted to walnut-based agroforestry systems and orchards in southeastern Loess Plateau of China

机译：黄土高原东南部以核桃为主的农林复合系统和果园的农田土壤有机碳和总氮变化

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摘要

Limited information is available on the effects of agroforestry system practices on soil properties in the Loess Plateau of China. Over the last decade, a vegetation restoration project has been conducted in this area by converting cropland into tree-based agroforestry systems and orchards to combat soil erosion and degradation. The objective of the present study was to determine the effects of land use conversion on soil organic carbon and total nitrogen in southeastern Loess Plateau. The experiment included three treatments: walnut intercropping system (AF), walnut orchard (WO), and traditional cropland (CR). After 7 years of continual management, soil samples were collected at 0-10, 10-30, and 30-50-cm depths for three treatments, and soil organic carbon (SOC) and total nitrogen (TN) were measured. Results showed that compared with the CR and AF treatments, WO treatment decreased both SOC and TN concentrations in the 0-50-cm soil profile. However, similar patterns of SOC and TN concentrations were observed in the AF and CR treatments across the entire profile. The SOC stocks at 0-50-cm depth were 5.42, 5.52, and 4.67 kg m(-2) for CR, AF, and WO treatments, respectively. The calculated TN stocks at 0-50-cm depth were 0.63, 0.62, and 0.57 kg m(-2) for CR, AF, and WO treatments, respectively. This result demonstrated that the stocks of SOC and TN in WO were clearly lower than those of AF and CR and that the walnut-based agroforestry system was more beneficial than walnut monoculture in terms of SOC and TN sequestration. Owing to the short-term intercropping practice, the changes in SOC and TN stocks were slight in AF compared with those in CR. However, a significant decrease in SOC and TN stocks was observed during the conversion of cropland to walnut orchard after 7 years of management. We also found that land use types had no significant effect on soil C/N ratio. These findings demonstrated that intercropping between walnut rows can potentially maintain more SOC and TN stocks than walnut monoculture and that agroforestry is a sustainable management pattern for vegetation restoration in the Loess Plateau area.
机译：关于中国黄土高原农林业制度实践对土壤性质的影响的信息有限。在过去的十年中，该地区已经进行了植被恢复项目，将农田转变为以树木为主的农林业系统和果园，以抗击土壤侵蚀和退化。本研究的目的是确定黄土高原东南部土地利用转化对土壤有机碳和总氮的影响。该实验包括三种处理方法：核桃间作系统（AF），核桃园（WO）和传统农田（CR）。经过7年的持续管理，在3种处理方式下，分别在0-10、10-30和30-50 cm深度处收集了土壤样品，并测量了土壤有机碳（SOC）和总氮（TN）。结果表明，与CR和AF处理相比，WO处理可降低0-50 cm土壤剖面中的SOC和TN浓度。然而，在整个过程中，AF和CR处理中均观察到了类似的SOC和TN浓度模式。对于CR，AF和WO处理，在0-50厘米深度处的SOC储量分别为5.42、5.52和4.67 kg m（-2）。对于CR，AF和WO处理，在0-50厘米深度处计算的TN储量分别为0.63、0.62和0.57 kg m（-2）。该结果表明，WO中SOC和TN的储量明显低于AF和CR的储量，并且基于核桃的农林业体系在SOC和TN固存方面比核桃单作更为有利。由于短期间作，AF的SOC和TN储量的变化比CR的要小。但是，经过7年的管理，在农田转为核桃园期间，观察到SOC和TN存量显着下降。我们还发现，土地利用类型对土壤碳氮比没有显着影响。这些发现表明，与核桃单一种植相比，核桃行之间的间作可以保持更多的SOC和TN储量，而农林业是黄土高原地区植被恢复的可持续管理模式。

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  • 来源
    《Environmental Monitoring and Assessment》 |2015年第11期|688.1-688.9|共9页
  • 作者

    Lu Sen; Meng Ping; Zhang Jinsong; Yin Changjun; Sun Shiyou;

  • 作者单位

    Chinese Acad Forestry, Res Inst Forestry, State Forestry Adm, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China|Nanjing Forestry Univ, Collaborat Innovat Ctr Sustaintable Forestry Sout, Nanjing 210037, Jiangsu, Peoples R China;

    Chinese Acad Forestry, Res Inst Forestry, State Forestry Adm, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China|Nanjing Forestry Univ, Collaborat Innovat Ctr Sustaintable Forestry Sout, Nanjing 210037, Jiangsu, Peoples R China;

    Chinese Acad Forestry, Res Inst Forestry, State Forestry Adm, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China|Nanjing Forestry Univ, Collaborat Innovat Ctr Sustaintable Forestry Sout, Nanjing 210037, Jiangsu, Peoples R China;

    Chinese Acad Forestry, Res Inst Forestry, State Forestry Adm, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);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; Total nitrogen; Agroforestry systems; Walnut orchard; Land use change;

    机译：土壤有机碳;总氮;农林业系统;核桃园;土地利用变化;

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