沙质草地不同生活史植物的生物量分配对氮素和水分添加的响应

doi:10.3724/SP.J.1258.2014.00011

植物生态学报 ›› 2014, Vol. 38 ›› Issue (2): 125-133.DOI: 10.3724/SP.J.1258.2014.00011

沙质草地不同生活史植物的生物量分配对氮素和水分添加的响应

毛伟¹^,^*(), 李玉霖¹, 崔夺², 赵学勇¹, 张铜会¹, 李玉强¹

¹中国科学院寒区旱区环境与工程研究所奈曼沙漠化研究站, 兰州 730000
²清华大学地球科学系统研究中心, 北京 100084

收稿日期:2013-01-15 接受日期:2013-04-02 出版日期:2014-01-15 发布日期:2014-02-12
通讯作者: 毛伟
作者简介:*(E-mail: maow@lzb.ac.cn)
基金资助:
国家重点基础研究发展计划项目(2009CB421102);中国科学院战略性先导科技专项项目(XDA05050406-4);国家自然科学基金项目(31270501);国家自然科学基金项目(31170413);国家自然科学基金项目(30970471)

Biomass allocation response of species with different life history strategies to nitrogen and water addition in sandy grassland in Inner Mongolia

MAO Wei¹^,^*(), LI Yu-Lin¹, CUI Duo², ZHAO Xue-Yong¹, ZHANG Tong-Hui¹, LI Yu-Qiang¹

¹Naiman Desertification Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
²Center for Earth System Science, Tsinghua University, Beijing 100084, China

Received:2013-01-15 Accepted:2013-04-02 Online:2014-01-15 Published:2014-02-12
Contact: MAO Wei

摘要/Abstract

摘要：

以氮素和水分(冬季增雪和夏季增雨)为控制因子, 开展相关田间控制实验, 分析不同功能群(以生活史为划分依据)尺度和群落尺度植物生物量分配格局对氮素和水分的响应, 得出以下结论: 1)一年生植物的繁殖生物量比重明显高于多年生植物, 而多年生植物种的叶/地上生物量比值显著高于一年生植物; 2)一年生植物对氮素和水分添加的响应剧烈, 氮添加耦合夏季增雨、氮添加耦合冬季增雪显著增加了一年生植物的繁殖生物量比重和叶生物量比重。多年生植物对氮素和水分添加的响应不敏感, 表现为多年生植物的各器官生物量分配格局对氮素添加和水分添加的响应不明显。3)氮素添加和水分处理改变了群落尺度生物量分配格局: 氮素添加耦合冬季增雪处理降低了群落植物的繁殖生物量比重和茎生物量比重, 提高了群落植物的叶生物量比重。4)冬季增雪和夏季增雨与氮素添加的交互作用对群落生物量分配格局的改变不同。夏季增雨耦合氮素添加处理下群落的茎生物量比重显著提高, 群落茎生物量分配的改变引起群落的垂直结构发生改变。冬季增雪氮素处理下群落的叶生物量比重增加, 但茎生物量比重增加不明显。冬季增雪也改变了群落的结构和功能。

关键词: 生物量分配, 群落结构, 功能群, 氮素添加

Abstract:

Aims We examine how resources influence plant productivity and plant biomass allocation in dry sandy grasslands. Our specific objective is to determine whether 1) annual species and perennial species differ in biomass allocation in response to nitrogen and water addition and 2) if differentiation exists, how nitrogen- and water-induced changes in biomass allocation for species affect ecosystem functioning at the community scale.
Methods This experiment was established in 2010 in the central region of the Horqin sandy grassland in Inner Mongolia. Two treatments, nitrogen and water addition, were started in May, and we measured leaf traits, leaf biomass, stem biomass, stem:leaf ratio, reproductive biomass and vegetative height of the dominant species.
Important findings Biomass allocation in response to nitrogen and water differed between annual species and perennial species. With nitrogen addition the reproductive biomass of annual species decreased 75.6% and the leaf biomass of annual species increased 86.7%. Water addition did not alter biomass allocation, but the interaction of nitrogen and water did. The relative stem biomass values increased 6.2% with nitrogen addition × increased snow in winter treatment, and relative leaf biomass values increased 15.3%. In nitrogen addition × increased precipitation in summer treatments, relative stem biomass and relative leaf biomass increased 28.7% and 19.4%, respectively. Nitrogen and water addition did not alter the biomass allocation pattern of perennial species, but the interaction of nitrogen and water increased reproductive biomass 40%. Nitrogen addition altered biomass allocation at the community scale. Relative reproduction biomass decreased 39.4%, and relative leaf values increased 40.1% with nitrogen addition treatments. On average, relative stem biomass decreased 23.4% and relative leaf biomass increased 57.1% with water addition. The interaction of nitrogen and water addition also significantly altered biomass allocation. Community reproductive biomass decreased 48.3%, community stem biomass decreased 31% and community leaf biomass increased 57.5% in nitrogen × precipitation treatments. We also found that community plant height increased with added nitrogen or water, resulting in a change of community vertical structure.

Key words: biomass allocation, community structure, functional group, nitrogen addition

毛伟, 李玉霖, 崔夺, 赵学勇, 张铜会, 李玉强. 沙质草地不同生活史植物的生物量分配对氮素和水分添加的响应. 植物生态学报, 2014, 38(2): 125-133. DOI: 10.3724/SP.J.1258.2014.00011

MAO Wei, LI Yu-Lin, CUI Duo, ZHAO Xue-Yong, ZHANG Tong-Hui, LI Yu-Qiang. Biomass allocation response of species with different life history strategies to nitrogen and water addition in sandy grassland in Inner Mongolia. Chinese Journal of Plant Ecology, 2014, 38(2): 125-133. DOI: 10.3724/SP.J.1258.2014.00011

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链接本文: https://www.plant-ecology.com/CN/10.3724/SP.J.1258.2014.00011

https://www.plant-ecology.com/CN/Y2014/V38/I2/125

图/表 8

表1 一年生植物生物量分配的方差分析

Table 1 ANOVA of the biomass allocation of annual plant species

处理 Treatment	df	繁殖生物量比重 Relatively reproduction biomass		茎生物量比重 Relatively stem biomass		叶生物量比重 Relatively leaf biomass		茎叶比 Stem:leaf ratio
处理 Treatment	df	F	p	F	p	F	p	F	p
氮素 Nitrogen (N)	1	10.57	0.004	2.01	0.170	4.48	0.047	0.48	0.500
水分 Water (W)	2	0.33	0.730	1.61	0.230	1.19	0.330	0.30	0.750
氮素×水分 N × W	2	1.15	0.250	8.18	0.003	5.42	0.013	7.56	0.004

图1 不同处理下一年生和多年生植物生物量分配(平均值±标准误差)。N0W0, 对照; N0Ww+, 氮素对照冬季增雪; N0Ws+, 氮素对照夏季增雨; N+W0, 氮素添加水分对照; N+Ww+, 氮素添加冬季增雪; N+Ws+, 氮素添加夏季增雨。

Fig. 1 Biomass allocation between annual species and perennial species in different treatments (mean ± SE). N0W0, control; N0Ww+, snow addition in winter; N0Ws+, water addition in summer; N+W0, nitrogen addition; N+Ww+, nitrogen addition and snow addition in winter; N+Ws+, nitrogen addition and water addition in summer.

表2 多年生植物各器官生物量分配的方差分析

Table 2 ANOVA of the biomass allocation of perennial plant species

处理 Treatment	df	繁殖生物量比重 Relatively reproduction biomass		茎生物量比重 Relatively stem biomass		叶生物量比重 Relatively leaf biomass		茎叶比 Stem:leaf ratio
	df	F	p	F	p	F	p	F	p
氮素 Nitrogen (N)	1	0.33	0.58	0.81	0.38	1.18	0.30	0.92	0.35
水分 Water (W)	2	1.44	0.27	0.77	0.48	1.34	0.29	0.92	0.42
氮素×水分 N × W	2	5.10	0.02	1.06	0.37	2.24	1.14	1.29	0.30

表3 群落各器官生物量分配的方差分析

Table 3 ANOVA of the biomass allocation at community scale

处理 Treatment	df	繁殖生物量比重 Relatively reproduction biomass		茎生物量比重 Relatively stem biomass		叶生物量比重 Relatively leaf biomass		茎叶比 Stem:leaf ratio
	df	F	p	F	p	df	F	p	F
氮素 Nitrogen (N)	1	24.37	<0.001	0.52	0.480	16.69	0.001	7.54	0.130
水分 Water (W)	2	5.29	0.015	4.17	0.032	10.67	0.001	9.05	0.002
氮素×水分 N × W	2	0.87	0.440	4.68	0.020	3.48	0.510	5.14	0.016

图2 不同氮素和水分添加处理下一年生植物和多年生植物的茎叶比(平均值±标准误差)。图注同图1。

Fig. 2 Stem:leaf ratios of annual and perennial plant in different nitrogen and water addition treatments (mean ± SE). Notes see Fig. 1.

图3 不同氮素和水分添加处理下一年生植物和多年生植物的叶面积(平均值±标准误差)。图注同图1。

Fig. 3 Leaf area of annual and perennial plants in different nitrogen and water addition treatments (mean ± SE). Notes see Fig. 1.

图4 不同处理下群落生物量分配的变化(平均值±标准误差)。图注同图1。

Fig. 4 Variations of biomass allocation in different treatments at community scale (mean ± SE). Notes see Fig. 1.

图5 不同处理下群落尺度叶面积的变化(平均值±标准误差)。图注同图1。

Fig. 5 Variations of leaf area at different treatments at community scale (mean ± SE). Notes see Fig. 1.

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沙质草地不同生活史植物的生物量分配对氮素和水分添加的响应

Biomass allocation response of species with different life history strategies to nitrogen and water addition in sandy grassland in Inner Mongolia

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