1 材料与方法
1.1 材料
1.2 方法
1.3 数据分析
2 结果与分析
2.1 不同施氮量对菠萝蜜苗干物质量的影响
表1 不同施氮水平菠萝蜜苗干物质量变化Tab. 1 Biomass of jackfruit seedlings under different N levels |
| 处理 Treatment | 叶片 Leaf/g | 茎秆 Stem/g | 根系 Root/g | 地上部 Shoot/g | 整株 Total plant/g | 根冠比 Ratio of root/shoot/% |
|---|---|---|---|---|---|---|
| N0 | 2.86±0.06b | 1.17±0.09c | 1.98±0.43a | 4.03±0.11b | 6.01±0.53b | 0.49±0.09a |
| N1 | 4.61±0.44a | 2.41±0.09a | 1.11±0.12b | 7.02±0.39a | 8.13±0.51a | 0.16±0.01b |
| N2 | 2.23±0.64bc | 1.36±0.10b | 1.58±0.15ab | 3.59±0.74bc | 5.17±0.71b | 0.46±0.12a |
| N3 | 1.73±0.29c | 1.18±0.07c | 1.96±0.72a | 2.91±0.36c | 4.87±1.07b | 0.66±0.16a |
Note: Values followed by different lowercase letters indicate significantly different for the same growth stage at 0.05 level. | |
注:数据后不同小写字母表示不同处理间差异显著(P<0.05)。 |
2.2 不同施氮量对菠萝蜜幼苗不同器官氮素养分积累的影响
表2 菠萝蜜幼苗不同器官中的氮素积累量和比例Tab. 2 Accumulation and percentage of nitrogen in different organs of jackfruit |
| 处理 Treament | 叶片 Leaf | 茎秆 Stem | 根系 Root | 总氮素累积 Total nitrogen accumulation | |||||
|---|---|---|---|---|---|---|---|---|---|
| 积累量Accumulation/ (mg∙plant-1) | 比例Percentage/% | 积累量Accumulation/ (mg∙plant-1) | 比例Percentage/% | 积累量Accumulation/ (mg∙plant-1) | 比例Percentage /% | 积累量Accumulation/ (mg∙plant-1) | 比例Percentage /% | ||
| N0 | 25.43±2.14c | 57.14 | 6.62±0.87c | 14.87 | 12.86±5.31b | 27.99 | 44.91±6.07c | 100.00 | |
| N1 | 104.67±9.30a | 59.71 | 44.32±5.21a | 25.28 | 26.13±2.49ab | 15.01 | 175.13±12.26a | 100.00 | |
| N2 | 56.22±16.45b | 45.27 | 27.88±3.37b | 22.92 | 38.69±3.40a | 31.81 | 122.80±18.54b | 100.00 | |
| N3 | 51.44±14.38b | 41.65 | 33.54±4.60b | 27.85 | 38.72±16.51a | 30.51 | 123.70±35.48b | 100.00 | |
Note: Values followed by different lowercase letters indicate significantly different for the same growth stage at 0.05 level. | |
注:数据后不同小写字母表示不同处理间差异显著(P<0.05)。 |
2.3 不同施氮量对菠萝蜜苗根系生长的影响
2.4 不同施氮量下菠萝蜜幼苗营养指标与根系生长指标相关性分析
图2 不同施氮量下菠萝蜜幼苗营养指标与根系生长指标相关性分析TRL:总根长;TRSA:根系总表面积;TRV:根系总体积;SN:地上部氮累积量;RN:地下部氮累积量;TN:总氮素累积量;DWS:地上部干重;DWR:地下部干重;TDW:总干重;RRS:根冠比。*表示不同处理间差异显著(P<0.05);**表示不同处理间差异极显著(P<0.01)。蓝色表示正相关,红色表示负相关,圆形的大小也说明了相关性的大小。 Fig. 2 Correlation between the nutritional indices and root growth indices of jackfruit in different N levels TRL: total root length; TRSA: total root surface area; TRV: total root volume; SN: shoot nitrogen; RN: root nitrogen; TN: total nitrogen; DWS: dry weight of shoot; DWR: dry weight of root; TDW: total dry weight; RRS: ratio of root/shoot. *indicates significant difference at 0.05 level; **indicates extremely significant difference at 0.01 level. Blue indicates a positive correlation, red indicates a negative correlation. The size of the circle indicates the magnitude of the correlation. |
2.5 施肥、根系生长指标、氮素累积量对菠萝蜜苗生物量变化的贡献
图3 菠萝蜜苗生物量变化的驱动力分析每个顶点为单个因子的解释量,3条边上的数值为因子间共同解释量,中心点为三者共同解释量,底部矩形框内数值为不能解释的量。 Fig. 3 Variation partitioning analysis (VPA) was used to quantify the effects of soil fertilizer (N), nitrogen accumulation of shoot (SN), total root length (TRL), and interactions among them on jackfruit biomass Circles on the edges of the triangle show the percentage of variation explained by each factor alone. The percentage of variation explained by interactions between two or three of the factors is shown as rectangles on the sides and as a circle at the center of the triangle. The unexplained variation is depicted in the rectangle on the bottom. |
