养分添加与干扰对荒漠草原群落组成及构建的影响

doi:10.13866/j.azr.2023.06.11

Abstract

Abstract:

The effects of short-term nutrient additions (NPKμ, 10 g·m^-2) and disturbances on the species diversity, functional traits, soil properties, and community assembly mechanisms of the herbaceous community in the Urat desert steppe were examined. A mixed linear model, principal component analysis, and null model methods were utilized and both disturbance and interaction treatments were found to significantly reduce species richness and β diversity. Short-term nutrient additions significantly reduced soil pH but increased soil electrical conductivity. Six functional traits of the dominant species (i.e. Stipa glareosa, Peganum harmala, Salsola collina, Corispermum mongolicum) and six community-weighted mean significant changes under the disturbance and nutrient addition treatments were identified. The disturbance and nutrient additions promoted the transformation of the dominant species in the community from conservative strategies to acquisitive strategies. The results of the two null models revealed that community assembly under the control tended to be a stochastic process, while the disturbance and interaction treatments tended to be deterministic processes, and that of the nutrient addition treatments tended to be weaker deterministic processes. Plant communities in the desert steppe responded and adapted to the nutrient additions and disturbances through changes in the dominant species and their crucial functional traits.

Key words: desert steppe, nutrient addition, disturbance, species diversity, functional diversity, community assembly

QIAO Jingjuan, ZUO Xiao’an, YUE Ping, WANG Guolin, WANG Jingyuan, WANG Zezhou. Nutrient addition and disturbance effects on the community composition and assembly in a desert steppe[J].Arid Zone Research, 2023, 40(6): 958-970.

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References 41

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物种	生活型
沙生针茅 (Stipa glareosa)	多年生
猪毛菜 (Salsola collina)	一年生
蒙古虫实 (Corispermum mongolicum)	一年生
骆驼蓬 (Peganum harmala)	多年生
鸦葱 (Scorzonera austriaca)	多年生
兔唇花 (Lagochilus ilicifolium)	多年生
碱韭 (Allium polyrhizum)	多年生
蒙古韭 (Allium mongolicum)	多年生
冷蒿 (Artemisia frigida)	多年生
糙隐子草 (Cleistogenes squarrosa)	多年生
天门冬 (Asparagus cochinchinensis)	多年生
银灰旋花 (Convolvulus ammannii)	多年生
砂蓝刺头 (Echinops gmelini)	多年生
冰草 (Agropyron cristatum)	多年生

指标	处理
指标	对照	干扰	养分添加	交互处理	F 值	P 值
pH	9.44±0.02A	9.43±0.02A	9.10±0.07B	9.09±0.07B	10.36	P < 0.001
SWC/%	0.68±0.28	1.34±0.51	0.89±0.17	0.84±0.29	0.56	P > 0.05
EC/(μS·cm^-1)	76.62±5.84B	79.32±4.64B	132.17±2.28A	134.10±7.57A	27.53	P < 0.001
TNC/(g·kg^-1)	0.32±0.02	0.31±0.01	0.36±0.03	0.35±0.02	0.92	P > 0.05
TCC/(g·kg^-1)	4.52±0.14	5.58±0.52	4.98±0.54	5.22±0.28	0.96	P > 0.05

Nutrient addition and disturbance effects on the community composition and assembly in a desert steppe

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