Effects of precipitation on above-ground biomass of Peganum harmala in desert steppe in Inner Mongolia， China

doi:10.7522/j.issn.1000-694X.2021.00107

Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (2): 164-172.DOI: 10.7522/j.issn.1000-694X.2021.00107

Effects of precipitation on above-**ground biomass of Peganum harmala in desert steppe in Inner Mongolia， China**

Xinxin Guo¹^,²(), Ping Yue¹, Xiangyun Li¹^,², Jingjuan Qiao¹^,², Ya Hu¹^,², Xiaoan Zuo¹()

^1.Urat Desert-Grassland Research Station / Naiman Desertification Research Station / Key Laboratory of Stress Physiology and Ecology，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:2021-04-22 Revised:2021-08-25 Online:2022-03-20 Published:2022-03-30
Contact: Xiaoan Zuo

Abstract

Abstract:

Understanding the effects of precipitation change on plant growth and development in desert steppe is crucial for predicting the response and adaptation of desert steppe plants to climate change. Here， we conducted a 3-years experiment to examine the effects of precipitation changes （background and ±50% precipitation） on quantitative characteristics （branch number， fruit number and plant density）， aboveground biomass （AGB） and functional traits of the dominant plant Peganum harmala in Urat desert steppe. Correlation analysis was conducted to study the correlation between each factor and AGB. And structural equation model （SEM） was established to explore the influence mechanisms of precipitation change， quantitative characteristics and functional traits on AGB of P. harmala. The results showed that：（1） Under the treatment of increased 50% precipitation， the number of branches， the number of fruits and the plant height were significantly increased（P<0.05）. Under decreased 50% precipitation， AGB， specific leaf area （SLA） and plant height were significantly decreased（P<0.05）， but leaf dry matter content （LDMC） was significantly increased（P<0.05）. （2） The increase of precipitation in the early growing season （EGSP） was beneficial to the growth of branch and fruit. It also alleviated the stress of decreased precipitation on SLA， LDMC and plant height. （3） AGB was significantly positively correlated with branch number， fruit number， plant density and plant height（P<0.05）， but negatively correlated with LDMC and leaf carbon content（P<0.05）. （4） The SEM showed that increasing annual precipitation indirectly increased AGB by inducing the increase of plant height， fruit number and plant density； EGSP indirectly affected AGB by inducing the change of fruit number. Both the changes of EGSP and annual precipitation deserve more attention in studying the effect of precipitation change on plant productivity in arid steppe. Our results highlight the importance of plant quantitative characteristics and functional traits in driving the responses of plant productivity to precipitation change in desert steppe ecosystems.

Key words: precipitation, above-ground biomass, functional traits, structural equation model

CLC Number:

Q945.1

Xinxin Guo, Ping Yue, Xiangyun Li, Jingjuan Qiao, Ya Hu, Xiaoan Zuo. Effects of precipitation on above-ground biomass of Peganum harmala in desert steppe in Inner Mongolia， China[J]. Journal of Desert Research, 2022, 42(2): 164-172.

Figures/Tables 7

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性状	降水处理	年际间	降水处理 × 年际间
分枝数	36.306^***	16.321^***	4.489^**
果实数	12.357^***	7.093^**	2.350^{^}
植株密度	2.864^{^}	1.724	0.576
地上生物量	8.363^***	1.266	1.143
叶面积	0.922	12.230^***	3.959^**
叶厚度	0.449	14.284^***	0.326
比叶面积	14.302^***	1.845	9.373^***
叶干物质含量	26.902^***	4.894^*	6.954^***
叶片碳含量	2.737^{^}	19.002^***	2.42^{^}
植株高度	15.023^***	1.467	3.948^**

性状	降水处理	年际间	降水处理 × 年际间
分枝数	36.306^***	16.321^***	4.489^**
果实数	12.357^***	7.093^**	2.350^{^}
植株密度	2.864^{^}	1.724	0.576
地上生物量	8.363^***	1.266	1.143
叶面积	0.922	12.230^***	3.959^**
叶厚度	0.449	14.284^***	0.326
比叶面积	14.302^***	1.845	9.373^***
叶干物质含量	26.902^***	4.894^*	6.954^***
叶片碳含量	2.737^{^}	19.002^***	2.42^{^}
植株高度	15.023^***	1.467	3.948^**

性状	降水处理			年份
性状	-50%	Cont.	+50%	2018	2019	2020
分枝数	7.06±0.96^c	10.76±0.85^b	16.54±1.37^a	8.19±0.93^c	14.59±1.58^a	11.58±1.28^b
果实数	1.11±0.3^c	3.54±0.65^b	5.42±1^a	1.53±0.39^b	4.69±0.86^a	3.84±0.93^a
植株密度	4.94±0.49	7.67±1.21	8.28±1.26	8.44±1.43	6.72±0.78	5.72±0.88
地上生物量	2.69±0.55^b	6.8±1.27^a	9.99±1.73^a	6.7±1.34	7.79±1.71	4.97±1.23
叶面积	0.23±0.01	0.21±0.01	0.22±0.01	0.2±0.01^b	0.2±0.01b	0.25±0.01^a
叶厚度	0.57±0.02	0.58±0.02	0.56±0.02	0.51±0.02^b	0.6±0.01^a	0.61±0.02^a
比叶面积	10.84±0.77^b	13.99±0.47^a	13.62±0.49^a	13.53±1.02	12.55±0.4	12.38±0.41
叶干物质含量	373.12±26.36^a	251.08±9.05^b	257.91±8.51^b	301.15±29.17^a	261.88±8.18^b	319.07±19.6^a
叶片碳含量	409.16±2.92	403.33±5.37	398.03±4.94	388.06±5.48^c	405.22±2.24^b	417.25±2.23^a
植株高度	6.44±0.53^c	8.41±0.56^b	9.97±0.43^a	8.34±0.84	8.79±0.47	7.69±0.42

性状	降水处理			年份
性状	-50%	Cont.	+50%	2018	2019	2020
分枝数	7.06±0.96^c	10.76±0.85^b	16.54±1.37^a	8.19±0.93^c	14.59±1.58^a	11.58±1.28^b
果实数	1.11±0.3^c	3.54±0.65^b	5.42±1^a	1.53±0.39^b	4.69±0.86^a	3.84±0.93^a
植株密度	4.94±0.49	7.67±1.21	8.28±1.26	8.44±1.43	6.72±0.78	5.72±0.88
地上生物量	2.69±0.55^b	6.8±1.27^a	9.99±1.73^a	6.7±1.34	7.79±1.71	4.97±1.23
叶面积	0.23±0.01	0.21±0.01	0.22±0.01	0.2±0.01^b	0.2±0.01b	0.25±0.01^a
叶厚度	0.57±0.02	0.58±0.02	0.56±0.02	0.51±0.02^b	0.6±0.01^a	0.61±0.02^a
比叶面积	10.84±0.77^b	13.99±0.47^a	13.62±0.49^a	13.53±1.02	12.55±0.4	12.38±0.41
叶干物质含量	373.12±26.36^a	251.08±9.05^b	257.91±8.51^b	301.15±29.17^a	261.88±8.18^b	319.07±19.6^a
叶片碳含量	409.16±2.92	403.33±5.37	398.03±4.94	388.06±5.48^c	405.22±2.24^b	417.25±2.23^a
植株高度	6.44±0.53^c	8.41±0.56^b	9.97±0.43^a	8.34±0.84	8.79±0.47	7.69±0.42

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Effects of precipitation on above-**ground biomass of Peganum harmala in desert steppe in Inner Mongolia， China**

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