Effects of fragment traits, burial orientation and nutrient supply on survival and growth in Populus deltoides × P. simonii.
Effects of fragment traits, burial orientation and nutrient supply on survival and growth in Populus deltoides × P. simonii.
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碎片性状、埋藏方向和养分供给对小叶杨存活和生长的影响
DOI：
10.1038/srep21031
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发表时间：
2016-02-15
影响因子：
4.6
通讯作者：
Wang YJ
中科院分区：
文献类型：
--
作者：
Zhang P;Su ZQ;Xu L;Shi XP;Du KB;Zheng B;Wang YJ
无性系树木的根或茎段的无性繁殖在适应环境异质性，即土壤养分异质性和干扰后的埋葬中起着关键作用。然而，很少有人知道是否埋藏方向和营养供应可以改变杨树碎片性状的影响。美洲黑杨（Populus deltoides × P.）simonii在两种不同的碎片直径（0.5和2.0厘米）、两种碎片长度（5和15厘米）和三种埋葬方向（水平、向上和向下）下被埋葬。对于拍摄片段，生存和增长显着较高的较大的作品（无论是在长度或直径）和水平/向上埋葬的位置。相反，埋置位置的影响是相反的根碎片。在水平埋置的15 cm长的茎/根碎片，然后进行两个不同的碎片直径（0.5和2.0 cm）和4种类型的营养供应（无营养，低频率，高频率和斑块）。高频率和间断营养处理显著提高了2.0cm左右的枝条生长量。这些结果表明，在杨树扦插繁殖、造林或更新中，可以采用埋藏定向和养分供应的方法。
Clonal propagations of shoot or root fragments play pivotal roles in adaptation of clonal trees to environmental heterogeneity, i.e. soil nutrient heterogeneity and burials after disturbance. However, little is known about whether burial orientation and nutrient supply can alter the effects of fragment traits in Populus. Shoot and root fragments of Populus deltoides × P. simonii were subjected to burials in two different fragment diameters (0.5 and 2.0 cm), two fragment lengths (5 and 15 cm) and three burial orientations (horizontal, upward and downward). For the shoot fragments, survival and growth were significantly higher in the larger pieces (either in length or diameter) and the horizontal/upward burial position. On the contrary, the effect of burial position was reversed for the root fragments. Shoot/root fragments of 15 cm in length in horizontal burial position were then subjected to two different fragment diameters (0.5 and 2.0 cm) and four types of nutrient supplies (without nutrient, low frequency, high frequency and patchy). Growth of shoot fragments of 2.0 cm in diameter significantly increased in high frequency and patchy nutrient supplies than that of without nutrient treatment. These results suggest that burial orientation and nutrient supply could be employed in clonal propagations of cuttings, afforestation or regeneration in Populus.