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Effects of ramet clipping and nutrient availability on growth and biomass allocation of yellow nutsedge

机译：分株修剪和养分有效性对黄nuts生长和生物量分配的影响

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A glasshouse experiment was conducted to examine how the interactions of nutrient availability and partial ramet clipping affect growth, reproduction and biomass allocation of Cyperus esculentus, an invasive sedge. The plants sprouting from tubers were grown at low and high nutrient levels, and were subject either to no clipping, one, two or three clippings, with each clipping cutting half of the existing ramets at soil level. Our results show that nutrient availability and clipping frequency tended to independently affect most of growth, reproduction and biomass allocation parameters of Cyperus esculentus examined in the present study. Increased supply of nutrients led to an increase in plant productivity and its associated traits. All of the traits, except for the number of ramets, displayed a decreasing pattern with increasing clipping frequency, indicating that Cyperus esculentus had undercompensatory responses to ramet clipping. It is likely that the patterns of plants' response to clipping are species specific, and depend on morphological characters of species. Its susceptibility to ramet clipping can offer opportunities for controlling this invasive species through mechanical methods such as mowing. Clipping had little effects on biomass allocation; however, root weight fraction increased with increasing clipping frequency. While nutrient availability and clipping frequency had no influence on leaf carbon concentration at harvest, both of them increased leaf nitrogen concentration, and hence reduced leaf C/N ratio.
机译：进行了温室试验，以研究养分利用率和部分partial裂修剪的相互作用如何影响莎草（入侵莎草）的生长，繁殖和生物量分配。块茎发芽的植物在低营养水平和高营养水平下生长，不修剪，只修剪一次，两个或三个，每个修剪在土壤水平上剪掉一半现有分株。我们的研究结果表明，养分有效性和截割频率倾向于独立影响本研究中所研究的香附子的大部分生长，繁殖和生物量分配参数。营养素供应的增加导致植物生产力及其相关性状的提高。除分株数量外，所有性状均表现出随修剪频率增加而降低的模式，表明香附子对分株修剪具有补偿不足的反应。植物对剪接的反应模式可能是物种特异性的，并取决于物种的形态特征。它对分枝修剪的敏感性可以为通过诸如割草的机械方法控制这种入侵物种提供机会。修剪对生物量分配几乎没有影响。然而，根重分数随修剪频率的增加而增加。尽管养分的有效性和修剪频率对收获时的叶片碳浓度没有影响，但两者都增加了叶片氮的含量，因此降低了叶片的碳氮比。

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