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毛竹Phyllostachys edulis是中国面积最广、经济价值最高的竹种[1],但其主要分布区土壤有效磷含量偏低[2],严重影响毛竹的生长和产量。研究表明:低磷胁迫降低了毛竹叶片叶绿素和金属含量[3],导致磷组分[4]和内源激素含量[5]等也发生变化,进而降低了整体生物量。常用施磷肥来增加土壤磷有效性,但过度施磷会引起水体富营养化、磷矿资源枯竭等问题[6]。因此,为应对缺磷带来的生产危机,研究植物对低磷胁迫的响应机制显得尤为重要[7]。低磷胁迫下,植物根系会分泌化学物质,影响根际土壤养分有效性[8];同时毛竹等植物会调整根冠比[5,9]等生物量分配格局来适应低磷环境。低磷胁迫还会促使植物改变自身对养分的需求,协调植物体内养分平衡[10]。但不同生长时期植物对养分的需求和获取存在差异[11]。快速生长时期,植物对养分需求较大,土壤供应可能不足,会促使植物发挥养分重吸收作用[12]。LU等[13]研究表明:低磷胁迫使紫花苜蓿Medicago sativa的磷素利用效率增强,但其效率随育苗时间延长而降低。张文元[14]研究表明:不同生长阶段毛竹对养分的需求及所处根际土壤化学性质存在差异。低磷胁迫会打破土壤原有的养分平衡,使植物体内养分调控机制发生变化。但施磷肥后不同生长时期土壤养分动态变化及毛竹实生苗适应性响应的研究尚无报道。综上,本研究模拟不同土壤磷环境,旨在探究低磷胁迫对不同生长时期根际土壤养分环境、毛竹幼苗生长和养分生理的影响及其持续效应,为植物对低磷环境的适应机制提供理论基础。
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表1所示:T1时期,与初始有效磷水平相比,P3和P4处理下的根际土壤有效磷质量分数降低,但低磷处理组(P1和P2)处理下反而增加;此时低磷处理组的根际土壤pH分别较P4显著降低了10.60%和8.55% (P<0.05);但根际土壤全氮质量分数随初始有效磷水平降低而增加,其中P1较P4显著提高了19.23% (P<0.05);此时根际土壤有机质和速效钾质量分数在不同土壤有效磷水平间均无显著差异(P>0.05)。T2时期,根际土壤有效磷质量分数与初始设置水平相比均降低,但低磷处理组降幅较P4显著减小(P<0.05);此时根际土壤pH仅在P1下较P4显著降低3.53% (P<0.05);而低磷处理组的根际土壤全氮质量分数分别较P4显著增加了30.76%和11.82% (P<0.05);此时根际土壤速效钾质量分数在不同有效磷水平间仍无显著差异(P>0.05),但低磷处理组的根际土壤有机质质量分数分别较P4均显著增加了10.70% (P<0.05)。
表 1 初始土壤有效磷水平对根际土壤养分环境的影响
Table 1. Effects of initial soil available phosphorus level on soil nutrient environment in rhizosphere
生长时期 初始土壤有效磷水平 有效磷/(mg·kg−1) 有效磷变化幅度/% pH 有机质/(g·kg−1) 全氮/(mg·kg−1) 速效钾/(mg·kg−1) T1 P1 3.05±0.11 d 22.13±4.56 a 4.81±0.07 b 5.53±0.33 a 902.26±37.64 a 65.47±0.89 a P2 6.57±0.04 c 31.47±0.75 a 4.92±0.03 b 5.90±0.31 a 805.16±38.17 ab 65.94±1.63 a P3 8.47±0.21 b −15.30±2.09 b 5.40±0.03 a 5.83±0.42 a 868.47±4.46 ab 64.94±1.13 a P4 14.98±0.87 a −25.10±4.33 b 5.38±0.04 a 5.17±0.07 a 756.77±42.93 b 63.58±0.64 a T2 P1 2.32±0.04 D −7.33±1.76 A 5.19±0.03 B 7.45±0.21 A 1013.74±29.97 A 93.92±3.87 A P2 4.34±0.12 C −13.27±2.48 A 5.42±0.04 A 7.45±0.19 A 866.91±24.09 B 82.20±1.46 A P3 7.53±0.30 B −24.73±2.99 B 5.43±0.01 A 7.21±0.03 AB 836.34±17.01 BC 75.43±2.63 A P4 12.16±0.28 A −39.20±1.39 C 5.38±0.03 A 6.73±0.23 B 775.27±6.81 C 78.91±10.97 A 说明:数据为平均值±标准误。大小写字母分别表示T2和T1时期不同处理间差异显著(P<0.05);有效磷变化幅度中的−表示土壤有效 磷质量分数与初始水平相比降低,否则表示增加 -
表2所示:T1时,低磷处理组(P1和P2)的毛竹幼苗单株生物量分别较P4显著降低了27.09%和15.93% (P<0.05);根冠比较P4分别显著降低22.22%和14.29% (P<0.05);但各土壤有效磷水平下的毛竹幼苗生物量分配率从大到小均依次为根、叶、茎。T2时,低磷处理组的单株生物量较P4分别显著降低了48.96%和43.40% (P<0.05);但根冠比较P4分别显著增加了44.30%和37.97% (P<0.05);此时毛竹幼苗生物量分配率在各土壤有效磷水平下均从大到小依次为根、茎、叶。
表 2 初始土壤有效磷水平对毛竹幼苗生物量及分配的影响
Table 2. Effects of initial soil available phosphorus level on biomass and allocation of Ph. edulis seedlings
生长时期 初始土壤
有效磷水平生物量/(g·株−1) 生物量分配/% 根冠比 根 茎 叶 T1 P1 0.197±0.005 c 49.40±1.19 d 23.35±0.74 a 27.25±0.98 a 0.98±0.05 c P2 0.227±0.003 b 52.00±0.54 c 20.14±0.04 b 27.86±0.58 a 1.08±0.02 c P3 0.264±0.005 a 60.03±0.43 a 17.00±0.42 c 22.97±0.04 b 1.50±0.03 a P4 0.270±0.009 a 55.82±0.65 b 19.50±0.46 b 24.68±0.24 b 1.26±0.03 b T2 P1 0.243±0.020 B 54.56±1.39 A 29.17±2.40 AB 16.27±1.05 B 1.14±0.10 A P2 0.270±0.025 B 52.09±1.33 A 32.06±0.67 A 15.85±1.12 B 1.09±0.06 A P3 0.307±0.012 B 53.34±1.05 A 25.02±0.83 B 21.64±1.31 A 1.14±0.05 A P4 0.477±0.050 A 43.97±1.35 B 32.37±1.43 A 23.66±0.61 A 0.79±0.04 B 说明:数据为平均值±标准误。大小写字母分别表示T2和T1时期不同处理间差异显著(P<0.05) -
由图1可见:T1时,低磷处理组(P1和P2)较P4均显著降低了毛竹各组织氮质量分数(P<0.05),也显著降低了茎和叶的磷质量分数(P<0.05),但根的磷质量分数仅在P1处理下较P4显著降低了17.01% (P<0.05);此时P1和P4处理的毛竹各组织钾质量分数均无显著差异(P>0.05),但P2处理根和叶的钾质量分数较P4显著降低了6.18%和8.05% (P<0.05)。T2时,毛竹各组织氮质量分数也均随土壤有效磷水平降低而减小,其中低磷处理显著降低了根和茎的氮质量分数(P<0.05),但叶的氮质量分数在不同土壤有效磷水平间无显著差异(P>0.05);此时低磷处理显著降低了根磷质量分数(P<0.05),叶中则显著增加(P<0.05),但茎上无显著差异(P>0.05);而低磷处理组较P4均显著降低了该时期各组织钾质量分数(P<0.05)。
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由表3显示:无论T1还是T2时期,低磷处理(P1和P2)均显著降低了毛竹幼苗各组织和整株氮、磷、钾积累量(P<0.05)。其中T1时,P1和P2处理的氮积累量较P4分别显著降低了50.28%和38.74% (P<0.05),磷积累量则分别显著降低了42.59%和28.70% (P<0.05),钾积累量则分别显著减小了27.10%和21.55% (P<0.05);T2时,P1和P2处理的氮、磷、钾养分积累量分别依次较P4显著降低了66.86%和57.03%、57.11%和43.16%、60.94%和60.42% (P<0.05)。
表 3 初始土壤有效磷水平对毛竹幼苗养分积累量的影响
Table 3. Effects of initial soil available phosphorus level on nutrient accumulation of Ph. edulis seedlings
生长
时期初始土壤有效磷水平 根养分积累量/(mg·株−1) 茎养分积累量/(mg·株−1) 氮 磷 钾 氮 磷 钾 T1 P1 0.74±0.08 b 0.025±0.001 b 2.53±0.07 b 0.31±0.02 b 0.013±0.001 b 0.89±0.03 b P2 0.91±0.07 b 0.033±0.001 b 2.82±0.06 b 0.33±0.03 b 0.015±0.000 b 0.87±0.01 bc P3 1.50±0.08 a 0.046±0.004 a 3.50±0.09 a 0.34±0.03 b 0.015±0.001 b 0.78±0.01 c P4 1.60±0.18 a 0.047±0.003 a 3.85±0.19 a 0.63±0.01 a 0.021±0.001 a 1.01±0.05 a T2 P1 1.57±0.18 B 0.073±0.009 B 2.62±0.26 B 0.89±0.02 C 0.048±0.002 B 1.49±0.03 B P2 1.81±0.06 B 0.093±0.004 B 2.61±0.18 B 1.50±0.19 B 0.065±0.008 B 1.68±0.17 B P3 2.01±0.23 B 0.133±0.003 A 2.79±0.06 B 1.66±0.05 B 0.066±0.003 B 1.48±0.06 B P4 3.36±0.42 A 0.160±0.016 A 5.08±0.62 A 3.59±0.11 A 0.109±0.015 A 4.03±0.32 A 生长
时期初始土壤有效磷水平 叶养分积累量/(mg·株−1) 整株养分积累量/(mg·株−1) 氮 磷 钾 氮 磷 钾 T1 P1 0.77±0.02 c 0.024±0.001 c 1.18±0.02 b 1.81±0.10 c 0.062±0.001 d 4.60±0.09 c P2 0.99±0.11 bc 0.029±0.001 b 1.26±0.04 b 2.23±0.19 c 0.077±0.001 c 4.95±0.08 c P3 1.16±0.07 b 0.031±0.001 b 1.29±0.04 b 2.99±0.08 b 0.092±0.004 b 5.57±0.13 b P4 1.41±0.02 a 0.039±0.001 a 1.45±0.06 a 3.64±0.20 a 0.108±0.003 a 6.31±0.28 a T2 P1 1.06±0.08 C 0.042±0.006 B 1.14±0.16 C 3.51±0.24 C 0.163±0.016 C 5.25±0.39 B P2 1.24±0.26 BC 0.059±0.010 B 1.03±0.17 C 4.55±0.46 BC 0.216±0.022 BC 5.32±0.51 B P3 2.02±0.31 B 0.058±0.005 B 2.26±0.24 B 5.69±0.57 B 0.257±0.003 B 6.54±0.33 B P4 3.65±0.38 A 0.111±0.014 A 4.33±0.54 A 10.59±0.86 A 0.380±0.045 A 13.44±1.43 A 说明:数据为平均值±标准误。大小写字母分别表示T2和T1时期不同处理间差异显著(P<0.05) 由图2显示:T1时期,氮养分主要分配在根和叶上,分别占40%,且低磷处理组(P1和P2)较P3显著降低了氮在根的分配比例(P<0.05);此时磷养分在各组织分配比例从大到小均依次为根、叶、茎,且低磷处理组也较P3显著降低了磷分配在根的比例(P<0.05);钾养分与磷相似,分配比例从大到小均依次为根、叶、茎,此时低磷处理组较P3和P4均显著降低了其在根的分配比例(P<0.05)。T2时期,氮分配在各组织比例相当,且低磷处理组的氮分配在根的比例较P4均分别显著增加了41.05%和28.85% (P<0.05);钾养分分配比例因土壤有效磷水平不同而异,其中低磷处理组的钾分配比例从大到小依次为根、茎、叶,但中适磷则为根、叶、茎,此时低磷处理组的钾养分分配在根的比例较P4分别显著增加了31.79%和30.86% (P<0.05)。
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由表4可见:T1时期,低磷处理(P1和P2)显著增加了毛竹茎、叶及整株磷素利用效率,但根的磷素利用效率仅在P1下较P4显著增加了20.31%(P<0.05)。T2时期,低磷处理显著增加了根的磷素利用效率(P<0.05),叶中则显著降低(P<0.05),茎上无显著差异(P>0.05);此时仅P1的整株磷素利用效率较P4显著增加了19.05%,P2与P4间无显著差异(P>0.05)。
表 4 初始土壤有效磷水平对毛竹幼苗磷素利用效率的影响
Table 4. Effects of initial soil available phosphorus level on phosphorus utilization efficiency of Ph. edulis seedlings
生长
时期初始土
壤有效
磷水平磷素利用效率/(g·mg−1) 根 茎 叶 整株 T1 P1 3.85±0.09 a 3.57±0.07 a 2.22±0.03 a 3.16±0.02 a P2 3.58±0.15 ab 3.07±0.11 b 2.15±0.08 ab 2.93±0.07 b P3 3.44±0.21 ab 2.97±0.08 b 1.98±0.06 b 2.86±0.07 b P4 3.20±0.09 b 2.48±0.15 c 1.71±0.03 c 2.50±0.02 c T2 P1 1.83±0.03 a 1.46±0.06 a 0.95±0.01 c 1.50±0.03 a P2 1.51±0.05 b 1.35±0.11 a 0.74±0.01 d 1.25±0.04 b P3 1.23±0.04 c 1.17±0.07 a 1.15±0.02 a 1.19±0.04 b P4 1.31±0.02 c 1.43±0.09 a 1.02±0.01 b 1.26±0.02 b 说明:磷素利用效率=生物量/磷素积累量;数据为平均值±标准误;大小写字母分别表示T2和T1时期不同处理间差异显著(P<0.05)
Effect of low phosphorus stress on growth and nutrient physiology of Phyllostachys edulis seedlings
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摘要:
目的 探究低磷胁迫对不同生长时期根际土壤养分环境、毛竹Phyllostachys edulis幼苗生长和养分生理的影响及其持续效应,分析毛竹幼苗对低磷胁迫的适应机制。 方法 通过盆栽播种育苗方式,研究了4种不同土壤有效磷水平:2.5 mg·kg−1(极低磷,P1)、5.0 mg·kg−1(低磷,P2)、10.0 mg·kg−1(中磷,P3)、20.0 mg·kg−1(适磷,P4)对当年生长季末(T1)和翌年快速生长期(T2)根际土壤养分环境、毛竹幼苗生物量及其分配、毛竹幼苗养分吸收利用和分配的影响。 结果 低磷处理组(P1, P2)显著降低T1根际土壤pH (P<0.05),并维持了根际土壤高氮质量分数;这种低磷效应趋势持续至T2,且此时P1和P2的根际土壤有机质质量分数较P4显著增加了10.70% (P<0.05)。低磷处理组均显著降低了2个时期毛竹幼苗生物量及氮、磷、钾养分积累量(P<0.05),且T2时的降幅比T1更高。T1时,低磷处理组显著降低了毛竹幼苗根冠比(P<0.05),也相对降低根系养分的分配比例;但T2时,低磷处理组的根冠比分别较P4显著增加44.30%和37.97% (P<0.05),且显著增加了氮、钾养分在根系的分配比例(P<0.05)。低磷处理组显著增加了T1毛竹幼苗整株磷素利用效率(P<0.05),随育苗时间推移,其利用效率下降,至T2时,仅P1较P4显著增加了19.05% (P<0.05)。 结论 低磷胁迫抑制了毛竹幼苗生长和养分积累,但提高了其整体磷素利用效率;随育苗时间延长至翌年快速生长期时,低磷胁迫对植株的抑制作用增强,但毛竹幼苗通过提高根冠比、根系养分分配比例来提高对低磷胁迫的适应性。图2表4参25 Abstract:Objective To explore the effects of low phosphorus (P) stress on rhizosphere soil nutrient environment, as well as the growth and nutrient physiology of Phyllostachys edulis seedlings at different growth stages and their sustained effects, so as to analyze the adaptation mechanism of Ph. edulis seedlings to low P stress. Method Seeds of Ph. edulis were sown in pots to cultivate young seedlings. Rhizosphere soil nutrient environment, the biomass and its distribution of Ph. edulis seedlings, and the nutrient absorption, utilization and distribution of Ph. edulis seedlings at the end of the current growing season (T1) and the next rapid growing season (T2) were determined under four different soil available phosphorus conditions, 2.5 mg·kg−1 (very low phosphorus, P1), 5.0 mg·kg−1 (low phosphorus, P2), 10.0 mg·kg−1 (medium phosphorus, P3), 20.0 mg·kg−1 (suitable phosphorus, P4). Result Low P treatment group (P1, P2) significantly decreased pH in rhizosphere soil (P<0.05), and maintained the high N content of the rhizosphere soil at T1; The low P effect continued to T2, and the organic matter content of rhizosphere soil of P1 and P2 was significantly increased by 10.70% compared with that of P4 at this season (P<0.05). Low P treatment group significantly reduced the biomass and the accumulation of N, P, K nutrients of Ph. edulis seedlings at both stages (P<0.05), but the decline at T2 was higher than that at T1. At T1, the low P treatment group significantly reduced the root shoot ratio (R/S) and relatively reduced the proportion ratio of nutrients in the root of Ph. edulis seedlings; However, at T2, the R/S of the low P treatment group was significantly increased by 44.30% and 37.97% compared P4 (P<0.05), and the distribution ratio of N and K nutrients in the root was also significantly increased. The low P treatment group significantly increased the phosphorus use efficiency (PUE) of the whole plant of Ph. edulis seedlings (P<0.05), the PUE decreased with the passage of seedlings time, only P1 significanlty increased by 19.05% compared with P4 at T2 (P<0.05). Conclusion Low P stress inhibited the growth and nutrient accumulation of Ph. edulis seedlings, but increased the overall PUE. With the extension of seedling time to the next rapid growing season, the inhibition effect of low P stress on the plant was enhanced, but the adaptability of Ph. edulis seedlings to low P stress was improved by increasing the root-shoot ratio and the proportion of nutrient distribution to root. [Ch, 2 fig. 4 tab. 25 ref.] -
表 1 初始土壤有效磷水平对根际土壤养分环境的影响
Table 1. Effects of initial soil available phosphorus level on soil nutrient environment in rhizosphere
生长时期 初始土壤有效磷水平 有效磷/(mg·kg−1) 有效磷变化幅度/% pH 有机质/(g·kg−1) 全氮/(mg·kg−1) 速效钾/(mg·kg−1) T1 P1 3.05±0.11 d 22.13±4.56 a 4.81±0.07 b 5.53±0.33 a 902.26±37.64 a 65.47±0.89 a P2 6.57±0.04 c 31.47±0.75 a 4.92±0.03 b 5.90±0.31 a 805.16±38.17 ab 65.94±1.63 a P3 8.47±0.21 b −15.30±2.09 b 5.40±0.03 a 5.83±0.42 a 868.47±4.46 ab 64.94±1.13 a P4 14.98±0.87 a −25.10±4.33 b 5.38±0.04 a 5.17±0.07 a 756.77±42.93 b 63.58±0.64 a T2 P1 2.32±0.04 D −7.33±1.76 A 5.19±0.03 B 7.45±0.21 A 1013.74±29.97 A 93.92±3.87 A P2 4.34±0.12 C −13.27±2.48 A 5.42±0.04 A 7.45±0.19 A 866.91±24.09 B 82.20±1.46 A P3 7.53±0.30 B −24.73±2.99 B 5.43±0.01 A 7.21±0.03 AB 836.34±17.01 BC 75.43±2.63 A P4 12.16±0.28 A −39.20±1.39 C 5.38±0.03 A 6.73±0.23 B 775.27±6.81 C 78.91±10.97 A 说明:数据为平均值±标准误。大小写字母分别表示T2和T1时期不同处理间差异显著(P<0.05);有效磷变化幅度中的−表示土壤有效 磷质量分数与初始水平相比降低,否则表示增加 表 2 初始土壤有效磷水平对毛竹幼苗生物量及分配的影响
Table 2. Effects of initial soil available phosphorus level on biomass and allocation of Ph. edulis seedlings
生长时期 初始土壤
有效磷水平生物量/(g·株−1) 生物量分配/% 根冠比 根 茎 叶 T1 P1 0.197±0.005 c 49.40±1.19 d 23.35±0.74 a 27.25±0.98 a 0.98±0.05 c P2 0.227±0.003 b 52.00±0.54 c 20.14±0.04 b 27.86±0.58 a 1.08±0.02 c P3 0.264±0.005 a 60.03±0.43 a 17.00±0.42 c 22.97±0.04 b 1.50±0.03 a P4 0.270±0.009 a 55.82±0.65 b 19.50±0.46 b 24.68±0.24 b 1.26±0.03 b T2 P1 0.243±0.020 B 54.56±1.39 A 29.17±2.40 AB 16.27±1.05 B 1.14±0.10 A P2 0.270±0.025 B 52.09±1.33 A 32.06±0.67 A 15.85±1.12 B 1.09±0.06 A P3 0.307±0.012 B 53.34±1.05 A 25.02±0.83 B 21.64±1.31 A 1.14±0.05 A P4 0.477±0.050 A 43.97±1.35 B 32.37±1.43 A 23.66±0.61 A 0.79±0.04 B 说明:数据为平均值±标准误。大小写字母分别表示T2和T1时期不同处理间差异显著(P<0.05) 表 3 初始土壤有效磷水平对毛竹幼苗养分积累量的影响
Table 3. Effects of initial soil available phosphorus level on nutrient accumulation of Ph. edulis seedlings
生长
时期初始土壤有效磷水平 根养分积累量/(mg·株−1) 茎养分积累量/(mg·株−1) 氮 磷 钾 氮 磷 钾 T1 P1 0.74±0.08 b 0.025±0.001 b 2.53±0.07 b 0.31±0.02 b 0.013±0.001 b 0.89±0.03 b P2 0.91±0.07 b 0.033±0.001 b 2.82±0.06 b 0.33±0.03 b 0.015±0.000 b 0.87±0.01 bc P3 1.50±0.08 a 0.046±0.004 a 3.50±0.09 a 0.34±0.03 b 0.015±0.001 b 0.78±0.01 c P4 1.60±0.18 a 0.047±0.003 a 3.85±0.19 a 0.63±0.01 a 0.021±0.001 a 1.01±0.05 a T2 P1 1.57±0.18 B 0.073±0.009 B 2.62±0.26 B 0.89±0.02 C 0.048±0.002 B 1.49±0.03 B P2 1.81±0.06 B 0.093±0.004 B 2.61±0.18 B 1.50±0.19 B 0.065±0.008 B 1.68±0.17 B P3 2.01±0.23 B 0.133±0.003 A 2.79±0.06 B 1.66±0.05 B 0.066±0.003 B 1.48±0.06 B P4 3.36±0.42 A 0.160±0.016 A 5.08±0.62 A 3.59±0.11 A 0.109±0.015 A 4.03±0.32 A 生长
时期初始土壤有效磷水平 叶养分积累量/(mg·株−1) 整株养分积累量/(mg·株−1) 氮 磷 钾 氮 磷 钾 T1 P1 0.77±0.02 c 0.024±0.001 c 1.18±0.02 b 1.81±0.10 c 0.062±0.001 d 4.60±0.09 c P2 0.99±0.11 bc 0.029±0.001 b 1.26±0.04 b 2.23±0.19 c 0.077±0.001 c 4.95±0.08 c P3 1.16±0.07 b 0.031±0.001 b 1.29±0.04 b 2.99±0.08 b 0.092±0.004 b 5.57±0.13 b P4 1.41±0.02 a 0.039±0.001 a 1.45±0.06 a 3.64±0.20 a 0.108±0.003 a 6.31±0.28 a T2 P1 1.06±0.08 C 0.042±0.006 B 1.14±0.16 C 3.51±0.24 C 0.163±0.016 C 5.25±0.39 B P2 1.24±0.26 BC 0.059±0.010 B 1.03±0.17 C 4.55±0.46 BC 0.216±0.022 BC 5.32±0.51 B P3 2.02±0.31 B 0.058±0.005 B 2.26±0.24 B 5.69±0.57 B 0.257±0.003 B 6.54±0.33 B P4 3.65±0.38 A 0.111±0.014 A 4.33±0.54 A 10.59±0.86 A 0.380±0.045 A 13.44±1.43 A 说明:数据为平均值±标准误。大小写字母分别表示T2和T1时期不同处理间差异显著(P<0.05) 表 4 初始土壤有效磷水平对毛竹幼苗磷素利用效率的影响
Table 4. Effects of initial soil available phosphorus level on phosphorus utilization efficiency of Ph. edulis seedlings
生长
时期初始土
壤有效
磷水平磷素利用效率/(g·mg−1) 根 茎 叶 整株 T1 P1 3.85±0.09 a 3.57±0.07 a 2.22±0.03 a 3.16±0.02 a P2 3.58±0.15 ab 3.07±0.11 b 2.15±0.08 ab 2.93±0.07 b P3 3.44±0.21 ab 2.97±0.08 b 1.98±0.06 b 2.86±0.07 b P4 3.20±0.09 b 2.48±0.15 c 1.71±0.03 c 2.50±0.02 c T2 P1 1.83±0.03 a 1.46±0.06 a 0.95±0.01 c 1.50±0.03 a P2 1.51±0.05 b 1.35±0.11 a 0.74±0.01 d 1.25±0.04 b P3 1.23±0.04 c 1.17±0.07 a 1.15±0.02 a 1.19±0.04 b P4 1.31±0.02 c 1.43±0.09 a 1.02±0.01 b 1.26±0.02 b 说明:磷素利用效率=生物量/磷素积累量;数据为平均值±标准误;大小写字母分别表示T2和T1时期不同处理间差异显著(P<0.05) -
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