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首页> 外文期刊>Ecological indicators >Temperate grassland shifted from nitrogen to phosphorus limitation induced by degradation and nitrogen deposition: Evidence from soil extracellular enzyme stoichiometry
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Temperate grassland shifted from nitrogen to phosphorus limitation induced by degradation and nitrogen deposition: Evidence from soil extracellular enzyme stoichiometry

机译：温带草原由退化和氮沉积引起的氮素向磷素限制的转化：来自土壤细胞外化学计量的证据

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摘要

Soil extracellular enzyme activity (EEA) and enzymatic stoichiometry (ES) can provide a good indication of changes in soil nutrient availability and microbial demands for energy and nutrients. However, across different levels of degraded grasslands, whether the responses of soil EEAs to increasing nitrogen (N) deposition are consistent remains unclear. To explore the effects of N addition on soil EEAs in natural and degraded grasslands, we conducted a 3-year N addition experiment (0, 10, 20, 30, 40 and 50 g N m(-2) yr(-1)) at four sites in temperate grassland of northern China with different levels of degradation. We measured seven soil EEAs, including carbon (C)-acquiring enzyme (beta-1,4-glucosidase (BG)), N-acquiring enzymes (beta-N-acetyl-glucosaminidase (NAG) and leucine aminopeptidase (LAP)) and phosphorus (P)-acquiring enzyme (acid phosphatase (AP)) activities. The length and angle of vectors defined by ratios of enzyme activities (BG/(NAG + LAP) vs. BG/AP) were used to indicate relative microbial investments in C- (length), and N- and P- (angle) acquiring enzymes. Our results showed that N addition significantly increased AP activity by 176%, 116%, 220% and 268%, decreased LAP activity by 39%, 70%, 67% and 99%, but increased NAG activity by 185%, 137%, 164% and 118% in non-degraded, moderately degraded, severely degraded and extremely degraded grassland, respectively. Decreasing enzyme N: P and C: P ratios and increasing vector angle with the increasing levels of degradation suggested that temperate grassland could transform into P-limitation (angles 45 degrees) from N-limitation (angles 45 degrees). N addition significantly decreased the enzyme N: P ratio and increased the vector angle (angles 45 degrees), indicating that N addition further aggravated P limitation. Our findings highlight that grassland degradation would affect the responses of soil EEAs to N addition and cause nutrient limitation transformation. Soil ES might be a sensitive indicator mediated by soil microorganisms to the relative resource limitation in temperate grasslands.
机译：土壤细胞外酶活性（EEA）和酶促化学计量（ES）可以很好地表明土壤养分利用率的变化以及微生物对能量和养分的需求。但是，在退化草地的不同水平上，土壤EEA对增加的氮（N）沉积的响应是否一致尚不清楚。为了探索氮的添加对天然和退化草地土壤EEA的影响，我们进行了为期3年的氮添加实验（0、10、20、30、40和50 g N m（-2）yr（-1））在中国北方温带草原的四个地点，退化程度不同。我们测量了七个土壤EEA，包括碳（C）获取酶（β-1,4-葡萄糖苷酶（BG）），氮获取酶（β-N-乙酰氨基葡萄糖苷酶（NAG）和亮氨酸氨基肽酶（LAP））和磷（P）获取酶（酸性磷酸酶（AP））的活性。由酶活性比（BG /（NAG + LAP）与BG / AP的比值）定义的载体的长度和角度用于指示微生物在C-（长度），N-和P-（角度）获取方面的相对投资。酶。我们的结果表明，氮的添加显着提高了AP活性，分别为176％，116％，220％和268％，LAP活性分别降低了39％，70％，67％和99％，但NAG活性分别提高了185％，137％，未退化，中度退化，严重退化和极度退化的草地分别为164％和118％。酶N：P和C：P比例的降低以及矢量角随降解程度的增加而增加，表明温带草原可能会从N限制（角度<45度）转变为P限制（角度> 45度）。氮的添加显着降低了酶的氮磷比，并增加了载体角（角度> 45度），表明氮的添加进一步加剧了磷的限制。我们的研究结果表明，草地退化将影响土壤EEA对氮的响应，并导致养分限制转化。土壤ES可能是土壤微生物介导的对温带草原相对资源限制的敏感指标。

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  • 来源
    《Ecological indicators》 |2019年第6期|453-464|共12页
  • 作者

    Dong Chengcheng; Wang Wei; Liu Hongyan; Xu Xiaotian; Zeng Hui;

  • 作者单位

    Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China|Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China|Peking Univ, Shenzhen Grad Sch, Sch Urban Planning & Design, Shenzhen 518055, Peoples R China;

    Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China|Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China|Peking Univ, Shenzhen Grad Sch, Sch Urban Planning & Design, Shenzhen 518055, Peoples R China;

    Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China|Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China;

    Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China|Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China;

    Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China|Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China|Peking Univ, Shenzhen Grad Sch, Sch Urban Planning & Design, Shenzhen 518055, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Microbial activity; Enzymatic stoichiometry; Grassland degradation; Nitrogen addition; Nutrient limitation shift;

    机译：微生物活性酶化学计量法草地退化氮添加营养限度变化;

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