封育措施下荒漠草原针茅植物-土壤C、N、P化学计量特征

doi:10.11686/cyxb2019523

摘要/Abstract

摘要： 以内蒙古希拉穆仁典型荒漠草原封育措施(完全封育、季节封育)下优势植物短花针茅及克氏针茅为研究对象,通过测定其叶片、枯落物和土壤C、N、P 含量及化学计量特征,分析封育措施下两种针茅养分变化特征及养分限制因素。结果表明:1)两种针茅叶片及枯落物C、N、P含量均表现为完全封育>季节封育,土壤N含量为完全封育(2.54 g·kg^-1)<季节封育(2.75 g·kg^-1);2)两种针茅植物叶片C/N、C/ P表现为季节封育>完全封育(P<0.05),说明完全封育降低了两种植物的固碳能力,土壤C/N与C/P均表现为完全封育(6.03、39.80)>季节封育(4.92、36.58)且差异显著(P<0.05);3)不同封育措施两种针茅叶片N/P>16,说明封育下两种针茅植物在研究区内主要受P的限制。研究结果进一步为荒漠草原可持续恢复管理提供科学指导。

关键词: 叶片, 枯落物, 土壤, 生态化学计量, 希拉穆仁荒漠草原

Abstract: This research was conducted at Xilamuren in Inner Mongolia on typical desert steppe grassland dominated by Stipa breviflora and Stipa krylovii with the objective of defining the C, N, and P stoichiometry of leaves, litter and soil under two management regimes (year-round grazing exclusion and seasonal grazing exclusion). It was found that: 1) The content of C, N and P in the leaves and litter in year-round exclusion were all greater than in the seasonal exclusion, while the content of soil N in year-round exclusion (2.54 g·kg^-1) was less than that in the seasonal exclusion (2.75 g·kg^-1). 2) The C∶N and C∶P ratios of the leaves in seasonal exclusion was greater than that in the year-round exclusion, which showed that the carbon sequestration ability of the two grasses was reduced under year-round exclusion. However, the soil C∶N and C∶P ratios in seasonal exclusion (4.92 and 36.58, respectively) were less (P<0.05) than those in year-round exclusion (6.03 and 39.80, respectively). 3) The N∶P ratio of leaves were typically greater than 16. Therefore, this is an obvious indication that the two grasses studied were mainly restricted by lack of P at the study site. These results provide scientific data assist decisions on the sustainable recovery management of the desert grassland.

Key words: leanes, litter, soil, ecological stoichiometry, Xilamuren desert steppe

万芳, 蒙仲举, 党晓宏, 王瑞东, 张慧敏. 封育措施下荒漠草原针茅植物-土壤C、N、P化学计量特征[J]. 草业学报, 2020, 29(9): 49-55.

WAN Fang, MENG Zhong-ju, DANG Xiao-hong, WANG Rui-dong, ZHANG Hui-min. C, N and P ecological stoichiometry characteristics of a Stipa species plant-soil system subject to grazing exclusion in a desert steppe[J]. Acta Prataculturae Sinica, 2020, 29(9): 49-55.

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