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Sphagnum growth under N saturation: interactive effects of water level and P or K fertilization.
Plant Biology ( IF 4.2 ) Pub Date : 2020-03-04 , DOI: 10.1111/plb.13092
G Gaudig 1 , M Krebs 1 , H Joosten 1
Affiliation  

Sphagnum biomass is a promising material that could be used as a substitute for peat in growing media and can be sustainably produced by converting existing drainage-based peatland agriculture into wet, climate-friendly agriculture (paludiculture). Our study focuses on yield maximization of Sphagnum as a crop. We tested the effects of three water level regimes and of phosphorus or potassium fertilization on the growth of four Sphagnum species (S. papillosum, S. palustre, S. fimbriatum, S. fallax). To simulate field conditions in Central and Western Europe we carried out a glasshouse experiment under nitrogen-saturated conditions. A constant high water table (remaining at 2 cm below capitulum during growth) led to highest productivity for all tested species. Water table fluctuations between 2 and 9 cm below capitulum during growth and a water level 2 cm below capitulum at the start but falling relatively during plant growth led to significantly lower productivity. Fertilization had no effect on Sphagnum growth under conditions with high atmospheric deposition such as in NW Germany (38 kg N, 0.3 kg P, 7.6 kg K·ha-1 ·year-1 ). Large-scale maximization of Sphagnum yields requires precise water management, with water tables just below the capitula and rising with Sphagnum growth. The nutrient load in large areas of Central and Western Europe from atmospheric deposition and irrigation water is high but, with an optimal water supply, does not hamper Sphagnum growth, at least not of regional provenances of Sphagnum.

中文翻译:

氮饱和下的泥炭生长:水位与磷钾肥的交互作用。

泥炭生物质是一种有前途的材料,可以用作生长介质中泥炭的替代物,并且可以通过将现有的排水渠泥炭地农业转变为湿润,气候友好型农业(古生物学)来可持续地生产。我们的研究侧重于将水草作为农作物的产量最大化。我们测试了三种水位制度以及磷或钾肥对四种水藓(S. papillosum,S。palustre,S。fimbriatum,S。fallax)生长的影响。为了模拟中欧和西欧的田间条件,我们在氮饱和条件下进行了温室试验。恒定的高水位(生长过程中保持在头冠下方2 cm处)导致所有测试物种的最高生产率。在生长期间,地下水位在水平面以下2-9厘米之间波动,开始时水平面在水平面以下2 cm,但在植物生长期间相对下降,导致生产力大大降低。在德国西北部(38 kg N,0.3 kg P,7.6 kg K·ha-1·year-1)等高大气沉降条件下,施肥对泥炭藓的生长没有影响。大规模提高水藓产量需要对水进行精确的管理,水位刚好在头下部,并随着水的生长而上升。中欧和西欧大部分地区由于大气沉积和灌溉用水而产生的养分负荷很高,但在最佳供水条件下,不会阻碍泥炭藓的生长,至少不会阻碍泥炭藓的区域起源。
更新日期:2020-03-04
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