氮、磷和水分供给对羊草枯叶分解质量的影响

doi:10.3724/SP.J.1258.2011.00808

摘要/Abstract

摘要：

研究不同氮(N)、磷(P)和水分梯度上植物枯叶的N和P浓度及C : N和C : P的响应格局, 对于预测N沉降增加和降水格局改变对枯叶分解乃至养分循环的潜在影响具有一定的实践意义。该研究通过3个盆栽控制试验(N、P添加试验: 0、0.5、1.0、2.0、4.0、8.0、16.0、32.0、64.0和128.0 g N(P)∙m^-210个水平; 控水试验: 3 600、3 900、4 500、5 100、6 000、7 200、9 000、12 000、 18 000和36 000 mL∙pot^-110个水平), 探讨了这些环境因子改变对羊草(Leymus chinensis)枯叶分解质量的影响。结果表明, 在一定范围内, N添加提高了羊草枯叶的N浓度, 降低了C : N, 对P浓度和C : P没有明显的影响; P添加提高了枯叶的N和P浓度, 降低了C : N和C : P; 供水量增加显著降低了枯叶的N和P浓度, 提高了C : N和C : P。这表明, N、P和水分因子的改变影响了植物枯叶的性状, 且不同梯度的影响程度不同。因此, 全球气候变化可能影响植物枯叶的分解质量, 进而可能改变植被-土壤系统的养分循环。

关键词: 羊草, 枯叶分解质量, 氮供给, 磷供给, 水分供给

Abstract:

Aims Changes in atmospheric nitrogen (N) and precipitation are two important aspects of global climate change. They have altered biogeochemical cycling in ecosystems and are expected to affect plant nutrient use strategy and litter decomposition.

Methods We used three pot experiments, i.e., N addition (0, 0.5, 1.0, 2.0, 4.0, 8.0, 16.0, 32.0, 64.0 and 128.0 g N∙m^-2), phosphorus (P) addition (same levels) and water addition (3 600, 3 900, 4 500, 5 100, 6 000, 7 200, 9 000, 12 000, 18 000 and 36 000 mL∙pot^-1), to study N and P concentrations and C : N and C : P in senescing leaves of Leymus chinensis.

Important findingsN addition increased N concentration and decreased C : N, but did not significantly affect P concentration and C : P. P addition increased N and P concentrations and decreased C : N and C : P. Water addition decreased N and P concentrations and increased C : N and C : P. Therefore, changes in N, P and water availabilities affect litter decomposition quality and have effects on nutrient cycling in the plant-soil ecosystem.

Key words: Leymus chinensis, litter decomposition quality, nitrogen supply, phosphorus supply, water supply

黄菊莹, 余海龙, 袁志友, 李凌浩. 氮、磷和水分供给对羊草枯叶分解质量的影响. 植物生态学报, 2011, 35(8): 808-815. DOI: 10.3724/SP.J.1258.2011.00808

HUANG Ju-Ying, YU Hai-Long, YUAN Zhi-You, LI Ling-Hao. Effects of nitrogen, phosphorus and water supply on litter decomposition quality of senescing leaves of Leymus chinensis. Chinese Journal of Plant Ecology, 2011, 35(8): 808-815. DOI: 10.3724/SP.J.1258.2011.00808

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链接本文: https://www.plant-ecology.com/CN/10.3724/SP.J.1258.2011.00808

https://www.plant-ecology.com/CN/Y2011/V35/I8/808

图/表 6

图1 羊草枯叶N和P浓度对N添加的响应(平均值±标准误差)。

Fig. 1 Responses of N and P concentrations in senescing leaves of Leymus chinensis to N addition (mean ± SE).

图2 羊草枯叶N和P浓度对P添加的响应(平均值±标准误差)。

Fig. 2 Responses of N and P concentrations in senescing leaves of Leymus chinensis to P addition (mean ± SE).

图3 羊草枯叶N和P浓度对水分添加的响应(平均值±标准误差)。随着施N量的增加, 羊草枯叶的C : N呈降低趋势, 而C : P变化趋势不明显(图4): N水平≤16 g?m-2时, 枯叶的C : N从90.5 ± 8.7降低到29.9 ± 6.0, N水平>16 g?m -2时, C : N降低幅度变小, 仅从 20.6 ± 1.1降低到13.6 ± 1.3; 枯叶的C : P从722.7 ± 23.9降到449.9 ± 54.7, 与施N量关系不显著( 图4)。平均C : N和C : P分别为48.7和608.8。

Fig. 3 Responses of N and P concentrations in senescing leaves of Leymus chinensis to water addition (mean ± SE).

图4 羊草枯叶C : N和C : P对N添加的响应(平均值±标准误差)。随着施P量的增加, 羊草枯叶的C : N和C : P均呈降低趋势(图5): P水平≤8 g?m-2时, C : N随施P量的增加从90.5 ± 8.7降低到51.6 ± 10.5, C : P从620.0 ± 58.9降至109.4 ± 17.8, P水平>8 g?m -2时, C : N和C : P降低幅度均变小。平均C : N和C : P分别为58.2和274.2。

Fig. 4 Responses of C : N and C : P in senescing leaves of Leymus chinensis to N addition (mean ± SE).

图5 羊草枯叶C : N和C : P对P添加的响应(平均值±标准误差)。随着施水量的增加, 羊草枯叶的C : N和C : P均呈增加趋势(图6): 水分供给<12 000 mL时, 枯叶的C : N和C : P沿水分梯度增加幅度较大: 分别从27.2 ± 2.2增加至85.4 ± 9.7和从725.4 ± 57.6增加至2203.5 ± 324.9, 水分供给≥12 000 mL时, 二者增加幅度变缓。平均C : N和C : P分别为68.6和2 189.2。

Fig. 5 Responses of C : N and C : P in senescing leaves of Leymus chinensis to P addition (mean ± SE).

图6 羊草枯叶C : N和C : P对水分添加的响应(平均值±标准误差)。

Fig. 6 Responses of C : N and C : P in senescing leaves of Leymus chinensis to water addition (mean ± SE).

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