Effects of water and nitrogen changes on vegetation characteristics and leaf traits in Horqin Sandy land， Northern China

doi:10.7522/j.issn.1000-694X.2020.00087

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (6): 223-232.DOI: 10.7522/j.issn.1000-694X.2020.00087

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Effects of water and nitrogen changes on vegetation characteristics and leaf traits in Horqin Sandy land， Northern China

Yimei Sun¹(), Qing Tian¹(), Aixia Guo²^,⁴, Xiaoan Zuo³, Peng Lv³, Senxi Zhang²^,⁴

^1.College of Forestry，Gansu Agricultural University，Lanzhou 730070，China
^2.Urat Desert-Grasslas Land Research Station，Northwest Institute of Eco-Environment and Resource，Chinese Academy of Sciences，Lanzhou 730000，China
^3.Naiman Desertification Research Station，Northwest Institute of Eco-Environment and Resource，Chinese Academy of Sciences，Lanzhou 730000，China
^4.University of Chinese Academy of Sciences，Beijing 100049，China

Received:2020-06-05 Revised:2020-09-03 Online:2020-12-09 Published:2020-12-09
Contact: Qing Tian

Abstract

Abstract:

To demonstrate the effects of changes in precipitation pattern and nitrogen deposition on the vegetation community characteristics and leaf traits of dominant species in semi-arid sandy grassland， we examined water and nitrogen interactions， using five levels of water treatment ［natural precipitation （W0）， reduced precipitation （W-60% and W-100%） and increased precipitation （W+60% and W+100%）］ and two nitrogen levels ［0（N0） and 20 g·m^-2·a^-1（N+）］. The results showed that：（1） precipitation reduction （W-60% and W-100%） significantly reduced community coverage， aboveground biomass and litter biomass （P<0.05）. The increased precipitation 60% significantly increased the leaf area （P<0.05）， while the specific leaf area and leaf dry matter mass had no significant change under different precipitation treatments （P>0.05）；（2） nitrogen addition significantly increased plant community coverage， height， aboveground biomass and leaf area， while significantly reduced leaf dry matter content（P<0.05）. Community density， litter biomass and specific leaf area had no significant change （P>0.05）；（3） nitrogen addition significantly increased the community coverage under the treatment of increasing precipitation （W+60% and W+100%， P<0.05）， and the community density， aboveground biomass， litter biomass， and leaf area reached the maximum under the interactive treatment of 60% precipitation increase and nitrogen addition， while nitrogen addition significantly reduced the leaf dry matter content under the treatment of 60% precipitation reduction （P<0.05）. The above results show that nitrogen addition can alleviate the impact of drought on plants， and proper precipitation increase is beneficial to the stimulation of nitrogen fertility.

Key words: precipitation change, nitrogen addition, vegetation characteristics, leaf traits, Horqin Sandy Land

CLC Number:

Q948.1

Yimei Sun, Qing Tian, Aixia Guo, Xiaoan Zuo, Peng Lv, Senxi Zhang. Effects of water and nitrogen changes on vegetation characteristics and leaf traits in Horqin Sandy land， Northern China[J]. Journal of Desert Research, 2020, 40(6): 223-232.

Figures/Tables 7

Table 1 Effects of precipitation, nitrogen addition and its interactions on community characteristics and leaf traits in Horqin Sandy Land

处理	盖度	密度	地上生物量	凋落物量	高度	叶面积	比叶面积	叶干物质含量
降雨	11.846^***	2.515	8.346^***	4.397^**	1.156	1.437	0.349	1.612
氮添加	12.533^**	3.016	5.943^*	2.604	4.853^*	5.223^*	0.112	12.864^**
降雨×氮添加	1.541	0.285	1.346	0.399	0.433	0.307	1.230	0.784

Fig.1 Effect of precipitation treatments on community characteristics in Horqin Sandy Land

Fig.2 Effect of nitrogen addition on community characteristics in Horqin Sandy Land

Fig.3 Effect of water and nitrogen coupling on the community characteristics in Horqin Sandy Land

Fig.4 Effect of precipitation treatments on leaf traits of dominant species in Horqin Sandy Land

Fig.5 Effect of nitrogen addition on leaf traits of dominant species in Horqin Sandy Land

Fig.6 Effect of water and nitrogen coupling on leaf traits of dominant species in Horqin Sandy Land

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Effects of water and nitrogen changes on vegetation characteristics and leaf traits in Horqin Sandy land， Northern China

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