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首页> 外文期刊>Botanica Helvetica >Biomass Production Of The Last Remaining Fen With Saxifraga Hirculus In Switzerland Is Controlled By Nitrogen Availability
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Biomass Production Of The Last Remaining Fen With Saxifraga Hirculus In Switzerland Is Controlled By Nitrogen Availability

机译：瑞士虎耳草剩下的最后芬的生物量生产受氮的供应控制

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摘要

For conservation management of endangered plants it is important to know which nutrient(s) control growth of the vegetation, because maintenance of low nitrogen (N), phosphorus (P) or potassium (K) availability requires different management measures. The aim of this study was to determine the type of nutrient limitation for the vegetation in the last remaining site with Saxifraga hirculus in Switzerland, using nutrient ratios in the aboveground vegetation as an indicator. We made vegetation relevees, collected biomass of the vascular plants, and took soil samples in three plots at this site. The biomass was very low (152-231 g m~(-2)), and all three plots were clearly N-limited with N:P ratios of 7-8. Soil extractable N concentrations were generally low, and P and K concentrations were moderate to high, which was consistent with the indicated N limitation. Hence conservation management first of all needs to prevent N-enrichment, and needs to avoid increased mineralization rates through drainage, or the accumulation of N in the system from atmospheric deposition. Therefore N output seems required through for instance grazing or mowing. The current grazing management seems to function well, since total aboveground biomass is very low and S. hirculus has a high abundance in this last remnant.%idéale car la biomasse aérienne des plantes vasculaires est très faible et S. hirculus est abondant dans sa dernière station.
机译：对于濒危植物的保护管理，重要的是要知道哪种营养素能控制植被的生长，因为要保持低氮（N），磷（P）或钾（K）的利用率需要采取不同的管理措施。这项研究的目的是利用瑞士地上植被的养分比率来确定瑞士剩下的虎耳草的剩余养分的养分限制类型。我们制作了植被相关物，收集了维管植物的生物量，并在该地点的三个样地中采集了土壤样本。生物量非常低（152-231 g m〜（-2）），所有三个样区均明显受到N限制，N：P比为7-8。土壤可提取的氮浓度通常较低，磷和钾的浓度中等至较高，这与指示的氮限量相符。因此，保护​​管理首先需要防止氮的富集，并且需要避免通过排水增加矿化率，或者避免大气沉积产生的氮在系统中的积累。因此，例如通过放牧或割草似乎需要N的输出。当前的放牧管理似乎运作良好，因为地上总生物量非常低，而水生沙棘在最后一个残留物中的丰度很高。％idéalecar la bioe eaériennedes plantes vasculaires esttrèsfaible et S. hirculus est abondant dans sadernière站。

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