Effects of precipitation on the stability of aboveground biomass in desert steppe

doi:10.11686/cyxb2022135

Abstract

Abstract:

Based on the field precipitation control experiment from 2019 to 2021， this research studied the effects of different precipitation levels； Namely， simulated increased （+50%） precipitation， natural precipitation （CK） and precipitation reduction （-50%） on the stability of above-ground biomass in desert grasslands. This field study was conducted at Dashuikeng Grassland Research Station， Yanchi County （106°58' E， 37°24' N， average elevation， 1560 m）， Ningxia Hui Autonomous Region， China. It was found that： 1） Agropyron mongolicum determined its dominant position in the community through its adaptability to different rainfall regimes. Lespedeza davurica had the best drought resistance performance. Extreme drought led to a significant decline in the dominance status of Artemisia scoparia and Stipa breviflora， which are perennial species. Poaceous plants were more sensitive to rainfall. 2） Precipitation enhancement significantly improved the stability of the aboveground biomass of communities， perennial legumes， some annual plants or perennial weeds， and L. davurica and A. scoparia （P<0.001）. Extreme drought treatment significantly reduced the stability of the aboveground biomass of perennial grasses， A. mongolicum and S. breviflora （P<0.001）， but a compensation effect among different response functional groups maintained community stability. 3） The response mechanism of compensation between species to maintain the stability of the above-ground biomass determined the response of the desert steppe to extreme drought. By reducing the temporal variability of above-ground biomass under drought conditions， these responses， including compensation among functional groups， promote and maintain the stability of the desert grassland ecosystem.

Key words: stability, asynchrony, resistance, functional groups, precipitation levels, desert steppe

Xu-dong WU, Qi JIANG, Zhan-jun WANG, Bo JI, Xiao-bin REN. Effects of precipitation on the stability of aboveground biomass in desert steppe[J]. Acta Prataculturae Sinica, 2023, 32(11): 30-39.

Figures/Tables 5

References 41

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分组 Grouping	物种 Species	年份 Year									年际间差异性 Inter-annual differences
		2019			2020			2021			年际间差异性 Inter-annual differences
		-50%	CK	+50%	-50%	CK	+50%	-50%	CK	+50%	-50%	CK	+50%
优势植物Dominant species	蒙古冰草 A. mongolicum	16.05±5.28B	15.45±0.80B	34.52±3.09A	0.00B	18.23±1.92A	18.46±2.50A	34.19±3.36NS	28.61±4.16NS	35.29±2.98NS	P<0.001 F=179.53 CV=21.56	P<0.001 F=52.37 CV=12.94	P<0.001 F=87.69 CV=9.75
	达乌里胡枝子 L. davurica	15.98±4.53NS	21.75±1.76NS	14.22±1.74NS	25.07±4.60A	25.63±2.76A	17.51±2.55B	36.99±4.91A	28.02±3.51B	17.43±2.08C	P<0.001 F=40.50 CV=18.00	P>0.001 F=10.46 CV=11.01	P>0.01 F=6.14 CV=13.10
	猪毛蒿 A. scoparia	38.40±10.11NS	49.73±2.46NS	39.30±3.25NS	63.35±5.94A	42.37±2.46C	51.16±4.62B	5.84±1.47C	29.59±3.33A	22.75±3.44B	P<0.001 F=143.01 CV=19.02	P<0.001 F=107.43 CV=6.85	P<0.001 F=111.62 CV=10.12
	短花针茅 S. breviflora	8.05±2.40A	5.82±0.61B	3.74±0.47C	5.84±0.77A	3.19±0.29C	4.54±0.87B	2.33±0.80B	1.17±0.37C	5.39±1.39A	P<0.001 F=28.59 CV=28.25	P<0.001 F=219.43 CV=13.13	P>0.01 F=5.61 CV=21.62
功能群Functional groups	多年生禾本科植物Perennial gramineae grasses	25.89±8.09B	22.50±1.18B	38.67±3.02A	6.54±1.62B	21.87±2.27A	23.90±2.55A	39.97±2.85A	29.78±4.34B	40.76±2.96A	P<0.001 F=88.77 CV=20.88	P<0.001 F=18.26 CV=11.77	P<0.001 F=82.92 CV=8.29
	多年生豆科植物Perennial leguminous grasses	19.27±5.44NS	26.31±1.69NS	20.27±1.60NS	26.59±3.67B	33.38±2.02A	21.52±3.33C	50.64±2.90A	34.00±4.86B	33.42±3.04B	P<0.001 F=125.60 CV=12.88	P>0.001 F=14.35 CV=10.21	P<0.001 F=55.30 CV=11.01
	一、二年生植物或多年生杂草Annual & biennial plants or perennial forbs	42.13±11.34NS	51.18±1.85NS	41.06±3.07NS	68.34±4.98A	44.75±2.02C	54.58±3.26B	9.39±4.15C	36.22±6.68A	25.82±3.55A	P<0.001 F=122.70 CV=18.87	P<0.001 F=25.93 CV=9.47	P<0.001 F=152.15 CV=8.15
群落Community	地上生物量Aboveground biomass （g·m^-2）	96.41±5.04C	123.83±4.30B	147.01±7.27A	4.47±0.34C	65.32±2.03B	91.72±7.57A	21.07±2.94C	41.24±3.61B	63.47±5.30A	P<0.001 F=1688.31 CV=8.30	P<0.001 F=1215.20 CV=4.49	P<0.001 F=313.45 CV=6.74

分组 Grouping	物种 Species	年份 Year									年际间差异性 Inter-annual differences
		2019			2020			2021			年际间差异性 Inter-annual differences
		-50%	CK	+50%	-50%	CK	+50%	-50%	CK	+50%	-50%	CK	+50%
优势植物Dominant species	蒙古冰草 A. mongolicum	16.05±5.28B	15.45±0.80B	34.52±3.09A	0.00B	18.23±1.92A	18.46±2.50A	34.19±3.36NS	28.61±4.16NS	35.29±2.98NS	P<0.001 F=179.53 CV=21.56	P<0.001 F=52.37 CV=12.94	P<0.001 F=87.69 CV=9.75
	达乌里胡枝子 L. davurica	15.98±4.53NS	21.75±1.76NS	14.22±1.74NS	25.07±4.60A	25.63±2.76A	17.51±2.55B	36.99±4.91A	28.02±3.51B	17.43±2.08C	P<0.001 F=40.50 CV=18.00	P>0.001 F=10.46 CV=11.01	P>0.01 F=6.14 CV=13.10
	猪毛蒿 A. scoparia	38.40±10.11NS	49.73±2.46NS	39.30±3.25NS	63.35±5.94A	42.37±2.46C	51.16±4.62B	5.84±1.47C	29.59±3.33A	22.75±3.44B	P<0.001 F=143.01 CV=19.02	P<0.001 F=107.43 CV=6.85	P<0.001 F=111.62 CV=10.12
	短花针茅 S. breviflora	8.05±2.40A	5.82±0.61B	3.74±0.47C	5.84±0.77A	3.19±0.29C	4.54±0.87B	2.33±0.80B	1.17±0.37C	5.39±1.39A	P<0.001 F=28.59 CV=28.25	P<0.001 F=219.43 CV=13.13	P>0.01 F=5.61 CV=21.62
功能群Functional groups	多年生禾本科植物Perennial gramineae grasses	25.89±8.09B	22.50±1.18B	38.67±3.02A	6.54±1.62B	21.87±2.27A	23.90±2.55A	39.97±2.85A	29.78±4.34B	40.76±2.96A	P<0.001 F=88.77 CV=20.88	P<0.001 F=18.26 CV=11.77	P<0.001 F=82.92 CV=8.29
	多年生豆科植物Perennial leguminous grasses	19.27±5.44NS	26.31±1.69NS	20.27±1.60NS	26.59±3.67B	33.38±2.02A	21.52±3.33C	50.64±2.90A	34.00±4.86B	33.42±3.04B	P<0.001 F=125.60 CV=12.88	P>0.001 F=14.35 CV=10.21	P<0.001 F=55.30 CV=11.01
	一、二年生植物或多年生杂草Annual & biennial plants or perennial forbs	42.13±11.34NS	51.18±1.85NS	41.06±3.07NS	68.34±4.98A	44.75±2.02C	54.58±3.26B	9.39±4.15C	36.22±6.68A	25.82±3.55A	P<0.001 F=122.70 CV=18.87	P<0.001 F=25.93 CV=9.47	P<0.001 F=152.15 CV=8.15
群落Community	地上生物量Aboveground biomass （g·m^-2）	96.41±5.04C	123.83±4.30B	147.01±7.27A	4.47±0.34C	65.32±2.03B	91.72±7.57A	21.07±2.94C	41.24±3.61B	63.47±5.30A	P<0.001 F=1688.31 CV=8.30	P<0.001 F=1215.20 CV=4.49	P<0.001 F=313.45 CV=6.74

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