Total nonstructural carbohydrates of one temperate and two tropical grasses under varying clipping and soil moisture regimes

G. Misra, K.P. Singh
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引用次数: 5

Abstract

The distribution of total nonstructural carbohydrate (TNC) concentration and accumulation was analysed in various components of three selected grasses, a perennial C4 (Dichanthium annulatum) and two annuals, Echinochloa colonum (C4) and Polypogon monspeliensis (C3). The first two species were grown during dry summer and first and third during the winter season. Three moisture regimes were chosen, viz. full field capacity, half field capacity and unirrigated condition. The plants were clipped three times; each time 40 and 80% of the current live green was removed. In all the four instances, the TNC levels increased with greater soil moisture availability. Dichanthium grown in winter showed a drastic reduction in both concentration and accumulation due to soil moisture deficit while irrigated plants reflected higher TNC compared to Polypogon. Dichanthium grown in the summer had a higher value of TNC than Echinochloa in all the components. Clipping reduced the TNC levels in all the instances except in the spike. The extent of recovery from clipping seemed to depend upon the phenophase; plants in vegetative growth recovered earlier in summer Dichanthium compared to Echinochloa and Polypogon in which spike development delayed the build-up of TNC in the leaves.

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一种温带和两种热带禾草在不同修剪和土壤湿度下的总非结构性碳水化合物
分析了多年生C4双硫磷(Dichanthium annulatum)和一年生棘球藻(Echinochloa colonum, C4)和monspeliensis (Polypogon monspeliensis, C3) 3种禾草不同组分中总非结构碳水化合物(TNC)的浓度和积累分布。前两种生长在干燥的夏季,第一种和第三种生长在冬季。选择了三种水分状态,即满田、半田和不灌溉条件。这些植物被剪了三次;每次都有40%和80%的活绿被移除。在所有四个例子中,TNC水平随着土壤湿度的增加而增加。由于土壤水分亏缺,冬季生长的双硫磷浓度和积累量均急剧下降,而灌溉植株的TNC高于水草。夏季生长的双硫磷各组分的TNC值均高于紫藻。除尖峰外,剪辑降低了所有实例的TNC水平。剪枝恢复的程度似乎取决于物候期;营养生长的植物在夏季恢复得较早,与棘藻和水蛭相比,棘藻的穗发育延迟了TNC在叶片中的积累。
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