内蒙古草地叶片磷含量与土壤有效磷的关系

doi:10.3724/SP.J.1258.2011.00001

摘要/Abstract

摘要：

植物体内特别是叶片的P含量特征及其与环境的关系一直是植物生理生态学研究的一个热点。已有研究发现, 与全球植物数据相比, 中国植物叶片的P含量相对较低, 导致N/P高于全球平均水平, 并推测这是由于中国土壤全P含量较低引起的。该研究选取内蒙古草地来验证这一假设, 分析了36个样地57种优势植物叶片的P含量与土壤全P和有效P含量的关系。主要结果如下: 内蒙古草地叶片P含量较低而N/P较高, 与之前的研究结论一致; 在种群、样地和物种3个水平上, 叶片P含量、N/P与土壤P含量都没有显著的相关关系, 尽管土壤有效P含量的解释力高于土壤全P; 另一方面, 内蒙古草地土壤的有效P含量与全国土壤普查的结果接近, 高于美国及澳大利亚的平均值, 但低于世界土壤信息库里报道的全球土壤有效P平均值。鉴于内蒙古草地土壤的全P和有效P含量都不能准确反映叶片P含量, 且土壤的有效P含量也并不明显低于世界其他地区, 因此植物叶片P含量低、N/P高是由于土壤P含量低引起的这一假设在内蒙古草地不成立, 而且叶片P含量也与土壤P的可利用性无关。

关键词: 内蒙古草地, 叶片N/P, 叶片P含量, 土壤有效P含量, 土壤全P含量

Abstract:

Aims Phosphorus status and N/P stoichiometry in plant leaves have been studied intensively with recent focus on large-scale patterns and driving factors. Studies of Chinese terrestrial plants found that leaf P was considerably lower than the global average, resulting in a higher N/P, probably due to the low soil total P content at the national scale. Inner Mongolia grassland offers a diverse array of taxa and soil conditions to examine the correlation between leaf and soil P concentrations. Our objective was to determine how and to what extent soil total and available P modify leaf P across the study region.
Methods Leaf samples of 57 species were collected at 36 sites across Inner Mongolia grassland during July and August 2007. We determined leaf P concentration, N/P, soil total and available P concentrations and tested pairwise relationships between leaf and soil variables at species-by-site, inter-specific and inter-site levels.
Important findings Findings of relatively low leaf P and high N/P across Inner Mongolia grassland were consistent with previous findings. Neither soil total nor available P appeared to be related with leaf P concentration, although soil available P had a stronger explanatory power than soil total P content. Moreover, Inner Mongolian grassland did not show a great shortage of soil available P compared with USA, Australia and the global average. The hypothesis that low leaf P and high N/P of plants are caused by low soil P content do not hold in Inner Mongolian grassland. Instead, neither soil total nor available P shapes the pattern of leaf P and N/P across this grassland.

Key words: Inner Mongolia grassland, leaf N/P, leaf P concentration, soil available P content, soil total P content

耿燕, 吴漪, 贺金生. 内蒙古草地叶片磷含量与土壤有效磷的关系. 植物生态学报, 2011, 35(1): 1-8. DOI: 10.3724/SP.J.1258.2011.00001

GENG Yan, WU Yi, HE Jin-Sheng. Relationship between leaf phosphorus concentration and soil phosphorus availability across Inner Mongolia grassland. Chinese Journal of Plant Ecology, 2011, 35(1): 1-8. DOI: 10.3724/SP.J.1258.2011.00001

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图/表 6

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	叶片P Leaf P (mg·g^-1)	叶片N/P Leaf N/P	土壤全P Soil total P (mg·g^-1)	土壤有效P Soil available P (mg·kg^-1)
全部 Overall	1.51 ± 0.06	18.5 ± 0.44	0.33 ± 0.02	3.53 ± 0.14
标准偏差 SD	0.60	4.51	0.15	1.33
变异系数 CV	0.40	0.24	0.43	0.37
功能群 Functional group
禾草 Grass	1.25 ± 0.04^a	19.2 ± 0.61^b	0.34 ± 0.02^a	3.46 ± 0.19^a
杂类草 Forb	1.90 ± 0.09^b	16.3 ± 0.52^a	0.37 ± 0.03^a	3.56 ± 0.21^a
木本植物 Woody	1.51 ± 0.20^ab	19.0 ± 2.27^b	0.31 ± 0.04^a	2.72 ± 0.43^a
草地类型 Grassland type
荒漠草原 Desert steppe	1.60 ± 0.16^a	17.9 ± 1.00^a	0.28 ± 0.02^a	2.22 ± 0.17^a
典型草原 Typical steppe	1.21 ± 0.07^a	17.4 ± 0.55^a	0.35 ± 0.02^b	3.61 ± 0.15^b
草甸草原 Meadow steppe	1.56 ± 0.10^a	18.9 ± 1.10^a	0.39 ± 0.03^b	4.12 ± 0.36^b

	叶片P Leaf P (mg·g^-1)	叶片N/P Leaf N/P	土壤全P Soil total P (mg·g^-1)	土壤有效P Soil available P (mg·kg^-1)
全部 Overall	1.51 ± 0.06	18.5 ± 0.44	0.33 ± 0.02	3.53 ± 0.14
标准偏差 SD	0.60	4.51	0.15	1.33
变异系数 CV	0.40	0.24	0.43	0.37
功能群 Functional group
禾草 Grass	1.25 ± 0.04^a	19.2 ± 0.61^b	0.34 ± 0.02^a	3.46 ± 0.19^a
杂类草 Forb	1.90 ± 0.09^b	16.3 ± 0.52^a	0.37 ± 0.03^a	3.56 ± 0.21^a
木本植物 Woody	1.51 ± 0.20^ab	19.0 ± 2.27^b	0.31 ± 0.04^a	2.72 ± 0.43^a
草地类型 Grassland type
荒漠草原 Desert steppe	1.60 ± 0.16^a	17.9 ± 1.00^a	0.28 ± 0.02^a	2.22 ± 0.17^a
典型草原 Typical steppe	1.21 ± 0.07^a	17.4 ± 0.55^a	0.35 ± 0.02^b	3.61 ± 0.15^b
草甸草原 Meadow steppe	1.56 ± 0.10^a	18.9 ± 1.10^a	0.39 ± 0.03^b	4.12 ± 0.36^b

	种群水平 Population level			样地水平 Site-mean level			物种水平 Species-mean level
	r	p	n	r	p	n	r	p	n
Leaf P-STP	<0.001	0.99	124	0.036	0.85	33	0.083	0.56	57
Leaf P-SAP	0.094	0.38	121	0.136	0.46	31	0.223	0.12	57
Leaf NP-STP	0.091	0.39	124	0.123	0.50	33	0.085	0.55	57
Leaf NP-SAP	0.247	0.19	121	0.223	0.24	31	0.140	0.33	57

	种群水平 Population level			样地水平 Site-mean level			物种水平 Species-mean level
	r	p	n	r	p	n	r	p	n
Leaf P-STP	<0.001	0.99	124	0.036	0.85	33	0.083	0.56	57
Leaf P-SAP	0.094	0.38	121	0.136	0.46	31	0.223	0.12	57
Leaf NP-STP	0.091	0.39	124	0.123	0.50	33	0.085	0.55	57
Leaf NP-SAP	0.247	0.19	121	0.223	0.24	31	0.140	0.33	57

	土壤有效P Soil available P (mg·g^-1) (no. of observations)	Reference
内蒙古草地 Inner Mongolia grassland	3.53 (36)	本研究 This study
中国土壤 Chinese soils	3.83 (2 174)	全国土壤普查办公室, 1998 National Soil Survey Office of China, 1998
美国土壤 US soils	3.41 (27 715)	US Geological Survey, 2001
澳大利亚土壤 Australian soils	2.17 (38 895)	Gecscience Australia, 2007
全球土壤 Global soils	7.65 (1 125)	Batjes, 1995