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Stemflow in two xerophytic shrubs and its significance to soil water and nutrient enrichment

机译：两种旱生灌木的茎流及其对土壤水分和养分富集的意义

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摘要

Shrub canopies are expected to funnel substantial amounts of intercepted rainwater with enriched nutrients as stemflow to shrub base in the desert ecosystems characterized by limited water and nutrients. However, lacking are quantitative studies on the water and nutrient enrichment of stemflow at the shrub basal area. In this study, stemflow were quantified for two xerophytic shrubs (Caragana korshinskii and Artemisia ordosica) in a revegetated desert ecosystem of Shapotou area in northwestern China. We also measured the ion concentrations of total nitrogen (TN), total phosphors (TP), NH_4~+-N, NO_3~--N, Na~+, K~+, Ca~(2+), Mg~(2+), Cl~-SO_4~(2-) and the pH and electric conductivity (EC) in stemflow, throughfall and bulk precipitation. Results indicated that stemflow accounted for 8.8 and 2.8 % of the gross rainfall for C. korshinskii and A. ordosica, respectively. Individual stemflow linearly increased with increasing rainfall depth. Stemflow increased with rainfall intensity when rainfall intensity was less than 2 mm h~(-1) but showed decreased tendency thereafter. An antecedent precipitation of 1.3 and 1.6 mm was necessary for stemflow initiation for C. korshinskii and A. ordosica, respectively. The mean (confidence intervals, α = 0.05) funneling ratio was 82 (17) for C. korshinskii and 26 (7) for A. ordosica. Ion concentrations in stem-flow were higher than in throughfall, and the concentration of most of the ions measured were significantly higher (p < 0.05) in stemflow than in bulk precipitation, with a nutrient enrichment ratio ranged 122.8-1677.0 for C. korshinskii and 12.6-1306.0 for A. ordosica among measured ions, respectively. Overall, the larger funneling ratios and enrichment ratios for the two shrubs suggest that stemflow plays a significant positive role in soil water replenishment and nutrient enrichment at deeper soil profile of root zone in the revegetated ecosystems under arid desert conditions.
机译：灌木冠层有望将大量截留的雨水与丰富的养分一起漏入沙漠生态系统中以水和养分有限为特征的灌木基地。然而，缺乏对灌木基区茎流的水分和养分富集的定量研究。在这项研究中，对西北干旱区沙坡头荒漠化生态系统中的两种旱生灌木（柠条锦鸡儿（Caragana korshinskii）和蒿蒿（Artemisia ordosica））的茎流进行了定量。我们还测量了总氮（TN），总磷（TP），NH_4〜+ -N，NO_3〜--N，Na〜+，K〜+，Ca〜（2 +），Mg〜（2 +），Cl〜-SO_4〜（2-）以及茎流，穿透和大量降水中的pH和电导率（EC）。结果表明，干流分别占C. korshinskii和A. ordosica的8.8％和2.8％。单个茎流随降雨深度的增加而线性增加。当降雨强度小于2 mm h〜（-1）时，茎流随降雨强度的增加而增加，但随后呈现下降趋势。对于C. korshinskii和A. ordosica，茎流启动之前分别需要1.3和1.6 mm的沉淀。 C. korshinskii的平均漏斗率（置信区间为α= 0.05）为82（17），而A. ordosica的漏斗率为26（7）。茎流中的离子浓度高于穿透流中的离子浓度，并且茎流中测得的大多数离子的浓度均显着高于散装降水中的离子浓度（p <0.05），C。korshinskii和C.被测离子中的A. ordosica分别为12.6-1306.0。总体而言，两种灌木的较大漏斗率和富集率表明，在干旱沙漠条件下，植被恢复的根系土壤深部土壤剖面中，茎流在土壤水分补充和养分富集中起着显著作用。

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  • 来源
    《Ecological research》 |2013年第4期|567-579|共13页
  • 作者

    Ya-feng Zhang; Xin-ping Wang; Rui Hu; Yan-xia Pan; Hao Zhang;

  • 作者单位

    Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000, China University of Chinese Academy of Sciences, Beijing 100049, China;

    Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000, China;

    Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000, China;

    Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000, China,University of Chinese Academy of Sciences, Beijing 100049, China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Stemflow; Funneling ratio; Enrichment ratio; C. korshinskii; A. ordosica;

    机译：茎流漏斗率;富集率;C. korshinskii;鄂木;

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