Responses of leaf morphological traits of three dominant plants to water and nitrogen in desert steppe of Inner Mongolia

doi:10.7522/j.issn.1000-694X.2020.00095

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (1): 137-144.DOI: 10.7522/j.issn.1000-694X.2020.00095

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Responses of leaf morphological traits of three dominant plants to water and nitrogen in desert steppe of Inner Mongolia

Xinxin Guo¹^,²(), Xiaoan Zuo¹(), Ping Yue¹, Xiangyun Li¹^,², Shenglong Zhao¹^,², Peng Lv¹^,², Ya Hu¹^,²

^1.Urat Desert-Grassland Research Station / Naiman Desertification Research Station，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China

Received:2020-04-22 Revised:2020-09-06 Online:2021-01-29 Published:2021-01-29
Contact: Xiaoan Zuo

Abstract

Abstract:

It’s great important to study the effects of precipitation and nitrogen deposition on leaf morphological traits in desert steppe plants， which will predict the ecological adaptation of desert steppe plants under global changes. In this experiment， the effects of increasing and decreasing precipitation （±50%）， nitrogen addition （10 g·m^-2·yr^-1）and their interactions on leaf morphological traits of different dominant species were studied in desert steppe. The results showed that： different responses of the specific leaf area （SLA） and leaf dry matter content （LDMC） of the three plants （Stipa glareosa， Allium polyrhizum and Peganum harmala） were found to increasing or decreasing precipitation and nitrogen addition. （1） The SLA of A. polyrhizum was significantly reduced under the increasing precipitation （P<0.05）. And the SLAof P. harmala was decreased significantly by decreasing precipitation （P<0.05）. However， the LDMCwas increased significantly by decreasing precipitation. Only the LDMC of P. harmala has a significant decrease under nitrogen addition （P<0.05）. （2） A significant effect on P. harmala was observed by the interaction of water and nitrogen （P<0.05）. Furthermore， nitrogen addition could change the effect of decreasing precipitation on the leaf morphological traits of A. polyrhizum. （3） It’s a significant negative correlation between SLA and LDMC under decreasing precipitation， nitrogen addition and the interaction of increasing precipitation and nitrogen addition （P<0.05）. The leaf characters of S. glareosa were relatively stable. The SLA of A. polyrhizum was sensitive to the response of increasing precipitation. The leaf morphological traits of P. harmala were sensitive to decreasing precipitation， while nitrogen addition can reduce the stress of decreasing precipitation on them. Adaptions and responses of different plants in desert steppe to regional environmental changes were mediated by different ecological strategies and plasticity.

Key words: desert steppe, precipitation change, nitrogen addition, specific leaf area, leaf dry matter content

CLC Number:

Q948.11

Xinxin Guo, Xiaoan Zuo, Ping Yue, Xiangyun Li, Shenglong Zhao, Peng Lv, Ya Hu. Responses of leaf morphological traits of three dominant plants to water and nitrogen in desert steppe of Inner Mongolia[J]. Journal of Desert Research, 2021, 41(1): 137-144.

Figures/Tables 5

Table 1 Variance analysis of the response of leaf morphological leaf traits of different dominant species to water and nitrogen

处理	针茅（Stipa glareosa）		碱韭（Allium polyrhizum）		骆驼蓬（Peganum harmala）
处理	比叶面积SLA	叶干物质量LDMC	比叶面积SLA	叶干物质量LDMC	比叶面积SLA	叶干物质量LDMC
水分	2.70	0.92	7.14^**	1.04	5.98^**	11.29^***
氮素	0.02	0.18	0.37	0.02	3.09	6.08^*
水×氮	0.49	1.50	1.05	1.65	5.04^*	13.08^***

Fig.1 The response of leaf morphological traits of different dominant species to increase and decrease precipitation

Fig.2 The response of leaf morphological traits of different dominant species to nitrogen addition

Fig.3 The response of leaf morphological traits of different dominant species to water and nitrogen

Fig.4 The relationships betweenSLA and LDMC under different treatment

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Responses of leaf morphological traits of three dominant plants to water and nitrogen in desert steppe of Inner Mongolia

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