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首页> 外文期刊>Ecological research >Dynamics of soil respiration in sparse Ulmus punila woodland under semi-arid climate
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Dynamics of soil respiration in sparse Ulmus punila woodland under semi-arid climate

机译：半干旱气候下稀疏榆树林地土壤呼吸动力学

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摘要

Sparse Ulmus pumila woodlands play an important role in contributing to ecosystem function in semi-arid grassland of northern China. To understand the key attributes of soil carbon cycling in U. pumila woodland, we studied dynamics of soil respiration in the canopy field (i.e., the projected crown cover area) and the open field at locations differing in distance (i.e., at 1-1.5, 3-4, 10, and >15m) to tree stems from July through September of 2005, and measured soil biotic factors (e.g., fine root mass, soil microbial biomass, and activity) and abiotic factors [e.g., soil water content (SWC) and organic carbon] in mid-August. Soil respiration was further separated into root component and microbial component at the end of the field measurement in September. Results showed that soil respiration had a significant exponent relationship with soil temperature at 10-cm depth. The temperature sensitivity index of soil respiration, Q_(10), was lower than the global average of 2.0, and declined significantly (P < 0.05) with distance. The rate of soil respiration was generally greater in the canopy field than in the open field; monthly mean of soil respiration was 305.5-730.8 mg CO_2m~(-2) h~(-1) in the canopy field and 299.6-443.1 mg CO_2 m~(-2) h~(-1) in the open field from July through September; basal soil respiration at 10℃ declined with distance, and varied from ～250 mg CO_2 m~(-2) h~(-1) near tree stems to <200 mg CO_2 m~(-2) h~(-1) in the open field. Variations in soil respiration with distance were consis-rntent with patterns of SWC, fine root mass, microbial biomass and activities. Regression analysis indicated that soil respiration was tightly coupled with microbial respiration and only weakly related to root respiration. Overall, variations in SWC, soil nutrients, microbial biomass, and microbial activity are largely responsible for the spatial heterogeneity of soil respiration in this semi-arid U. pumila woodland.
机译：稀疏的榆树林地在中国北方半干旱草原的生态系统功能中发挥着重要作用。为了了解U. pumila林地土壤碳循环的关键属性，我们研究了在不同距离（即1-1.5）处的冠层场（即预计的树冠覆盖面积）和开阔地中土壤呼吸的动力学2005年7月至2005年9月，对树木的茎杆分别施加3-4、10和15m以上的距离，并测量了土壤生物因子（例如细根质量，土壤微生物生物量和活性）和非生物因子（例如土壤水分（ SWC）和有机碳]。 9月田间测量结束时，土壤呼吸进一步分为根成分和微生物成分。结果表明，土壤呼吸与10 cm深度的土壤温度有显着的指数关系。土壤呼吸温度敏感性指数Q_（10）低于全球平均水平2.0，并且随着距离的增加而显着下降（P <0.05）。冠层田间的土壤呼吸速率通常比空旷田间高。从7月开始，冠层农田的土壤呼吸的月平均数为305.5-730.8 mg CO_2m〜（-2）h〜（-1），而露天农田的土壤呼吸的月平均值为299.6-443.1 mg CO_2 m〜（-2）h〜（-1）到九月； 10℃的基础土壤呼吸作用随着距离的增大而下降，从靠近树干的约250 mg CO_2 m〜（-2）h〜（-1）到小于200 mg CO_2 m〜（-2）h〜（-1）不等。开放领域。土壤呼吸的距离随SWC，细根质量，微生物生物量和活性的变化而变化。回归分析表明，土壤呼吸与微生物呼吸紧密相关，而与根系呼吸之间的关系却微弱。总体而言，SWC，土壤养分，微生物生物量和微生物活性的变化是造成半干旱U. pumila林地土壤呼吸空间异质性的主要原因。

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  • 来源
    《Ecological research》 |2009年第4期|731-739|共9页
  • 作者

    Hong-Mei Jin; Osbert Jianxin Sun; Zhong-Kui Luo; Jin Liu;

  • 作者单位

    State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, 100093 Beijing, China Graduate University of Chinese Academy of Sciences. 100049 Beijing, China;

    Key Laboratory for Silviculture and Conservation of Ministry of Education, College of Forest Science, Beijing Forestry University, 100083 Beijing, China;

    State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, 100093 Beijing, China Graduate University of Chinese Academy of Sciences. 100049 Beijing, China;

    State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, 100093 Beijing, China Graduate University of Chinese Academy of Sciences. 100049 Beijing, China;

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  • 正文语种 eng
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  • 关键词

    ulmus pumila woodland; grassland; semi-arid region; soil respiration; microbial activity;

    机译：乌尔姆斯·普米拉林地草原;半干旱地区土壤呼吸微生物活性;

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