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首页> 外文期刊>Arid Land Research and Management >Responses of soil organic carbon and nitrogen to land-use changes in a semiarid region of northwest China
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Responses of soil organic carbon and nitrogen to land-use changes in a semiarid region of northwest China

机译：土壤有机碳和氮对西北地区半干旱地区土地利用变化的反应

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摘要

Currently, we lack a clear understanding of how climate influences the responses of soil organic carbon (OC) and nitrogen (N) to land-use changes in semiarid regions. Thus, to clarify the mechanisms involved, we measured the soil OC and total N (TN) concentrations and stocks in the 0-100 cm soil layer in adjacent grassland, farmland, and woodland at five sites on the Loess Plateau in China, which varied in terms of the mean annual precipitation (MAP) and mean annual temperature (MAT). The farmland or woodland was converted from grassland at each site. Conversion of grassland to farmland significantly reduced the soil OC and TN, with greater decreases in sites with relatively lower MAP and MAT (-0.60 Mg OC ha(-1 )yr(-1) and -0.22 Mg TN ha(-1 )yr(-1), respectively) than sites with relatively higher MAP and MAT (-0.35 Mg OC ha(-1 )yr(-1) and -0.04 Mg TN ha(-1 )yr(-1)). Conversion of grassland to woodland increased OC and TN at sites with higher MAP and MAT, but decreased them at sites with lower MAP and MAT. OC and TN increased to a depth of 100 cm with MAP and MAT after this land-use change. OC and TN decreased at relatively drier and colder sites, but increased at relatively wetter and warmer sites. These findings provide insights into the effects of land-use changes on the soil OC and TN under different climate conditions, thereby facilitating the sustainable management of grasslands in semiarid regions.
机译：目前，我们缺乏清楚地了解气候如何影响土壤有机碳（OC）和氮气（N）对半干旱地区土地使用变化的反应。因此，为了澄清所涉及的机制，在中国黄土高原的五个地点，我们在邻近草地，农田和林地中测量了0-100cm土层中的土壤OC和总N（TN）浓度和股票。就平均年降水量（地图）和平均年度温度（垫）而言。农田或林地从每个网站的草原转换。草原转换为农田显着降低土壤OC和TN，地图相对较低的地点减少（-0.60mg OC HA（-1）Yr（-1）和-0.22mg TN Ha（-1）Yr （-1）分别比具有相对较高的地图和垫的位点（-0.35mg OC HA（-1）Yr（-1）和-0.04mg TN Ha（-1）Yr（-1））。 Grassland转换为Woodland增加了oc和Tn，在具有更高地图和垫的地点，但在带有较低地图和垫子的地点下降。在此土地使用变化之后，OC和TN增加到100厘米的深度，在地图和垫子。在相对干燥的位置和较冷的位点处，OC和TN减少，但在相对较潮湿和温暖的地点增加。这些调查结果提供了对不同气候条件下土壤OC和TN的土地使用变化的影响的见解，从而促进了半干旱地区的草原可持续管理。

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  • 来源
    《Arid Land Research and Management》 |2020年第2期|共19页
  • 作者

    Tian Haifeng; Shen Xinlei; Qiu Liping; Wei Xiaorong; Zhang Yanjiang; Liu Jian; Gao Hailong; Cheng Jimin;

  • 作者单位

    Chinese Acad Sci &

    Minist Water Esources Inst Soil &

    Water Conversat Xinong Rd 26 Yangling 712100 Shaanxi Peoples R China;

    Chinese Acad Sci &

    Minist Water Esources Inst Soil &

    Water Conversat Xinong Rd 26 Yangling 712100 Shaanxi Peoples R China;

    Chinese Acad Sci &

    Minist Water Esources Inst Soil &

    Water Conversat Xinong Rd 26 Yangling 712100 Shaanxi Peoples R China;

    Chinese Acad Sci &

    Minist Water Esources Inst Soil &

    Water Conversat Xinong Rd 26 Yangling 712100 Shaanxi Peoples R China;

    Northwest A&

    F Univ State Key Lab Soil Eros &

    Dryland Farming Loess P Yangling Shaanxi Peoples R China;

    Northwest A&

    F Univ State Key Lab Soil Eros &

    Dryland Farming Loess P Yangling Shaanxi Peoples R China;

    Northwest A&

    F Univ State Key Lab Soil Eros &

    Dryland Farming Loess P Yangling Shaanxi Peoples R China;

    Northwest A&

    F Univ State Key Lab Soil Eros &

    Dryland Farming Loess P Yangling Shaanxi Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农业基础科学;
  • 关键词

    Farmland; grassland; the Loess plateau; pine forest; shrub land;

    机译：农田;草原;黄土高原;松树林;灌木土地;

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