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在多年生人工胡杨林内选取生长发育良好的胡杨植株,通过野外采样和室内分析,对胡杨条形、卵形和阔卵形3种异形叶的全N、全P、全K和有机C含量等4个矿质养分指标的含量在整个生长季内不同时期的动态变化特征进行研究,结果表明:(1)除条形叶和卵形叶全N含量为弱变异外,其他各矿质养分指标含量均为中等变异,且以条形叶的全K含量变异系数最大,条形叶的全N含量变异系数最小。(2)胡杨3种形状叶片的各矿质养分含量的年内动态变化特征较为一致,即均呈先上升,后下降的趋势。条形叶的全N含量和有机C含量最大值出现在7月下旬至8月初,而卵形叶和阔卵形叶的最大值均出现在6月中旬;条形叶的全K含量和全P含量最大值均出现在6月中旬,而卵形叶和阔卵形叶最大值出现时间较晚,基本均出现在7月中上旬(3)叶片除全N含量为卵形叶>条形叶>阔卵形外,其他各养分指标含量均为条形叶>卵形叶>阔卵形叶。
Populus euphratica in the perennial artificial selection of well-developed poplar plants, field sampling and indoor analysis of Populus euphratica, Oval and broad oval three kinds of shaped leaves of all N, all P, total K and organic C content 4 The results showed that: (1) Except for the total N content of the stripe leaves and oval leaves were weakly variable, the content of other mineral nutrients of all the other mineral nutrient indicators were Medium variation, and the coefficient of variation of the total K content of the stripe leaves was the largest, and the coefficient of variation of the total N content of the stripe leaves was the smallest. (2) The dynamic changes of mineral nutrient contents of three types of leaves of Populus euphratica during the year were more consistent, that is, all showed the trend of first increasing and then decreasing. The maximum value of total N content and organic C content appeared in late July to early August in striped leaves, while the maximum of oval and broad ovoid leaves appeared in mid June. The total K content and total The maximum value of P content appeared in mid-June, while the maximum value of oval-shaped leaf and broad-ovoid leaf appeared later in mid-July. (3) The content of total N was oval leaf> Leaves> broad ovoid, the other indicators of nutrient content are striped leaves> oval leaves> broad oval leaves.