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### 荒漠草原异质生境下猪毛蒿种群动态

1. 宁夏大学西北土地退化与生态恢复国家重点实验室培育基地/西北退化生态系统恢复与重建教育部重点实验室, 银川 750021
• 收稿日期:2019-01-04 出版日期:2019-08-15 发布日期:2019-08-15
• 通讯作者: * E-mail: songnp@163.com
• 作者简介:陈林,男,1983年生,博士研究生.主要从事恢复生态学研究.E-mail:chenlin198388@163.com
• 基金资助:
国家重点研发计划项目(2016YFC0500709)、宁夏高等学校一流学科建设(生态学)项目(NXYLXK2017B06)和宁夏青年科技人才托举工程项目(TJGC2018068)

### Population dynamics of Artemisia scoparia in heterogeneous habitats in the desert steppe

CHEN Lin, SU Ying, LI Yue-fei, SONG Nai-ping*, WANG Lei, YANG Xin-guo, QIU Kai-yang, LIU Bo

1. Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China/Ministry of Education Key Laboratory for Restoration and Reconstruction of Degra-ded Ecosystem in Northwest China, Ningxia University, Yinchuan 750021, China.
• Received:2019-01-04 Online:2019-08-15 Published:2019-08-15
• Contact: * E-mail: songnp@163.com

Abstract: To understand the intra- and inter-annual population dynamics of Artemisia scoparia in the desert steppe, we set up three treatments, i.e., increasing the precipitation by 30%, reducing the precipitation by 30%, and the control (CK) in each soil habitat of aeolian sandy soil, sierozem soil, and bedrock weathered sedimentary soil. We drew up the dynamic life table to produce population survival and death curves and analyzed the population dynamics of A. scoparia in different habitats. Results showed that the survival curve of A. scoparia was approached to Deevey-Ⅰtype. The survival rate was high in the early growth stage and tended to be relatively stable. The mortality rate maintained at a low level, but rose fast at the end of the growth stage. The individual survival number of A. scoparia in all habitats fluctuated at the early stage and declined at the later stage. The mortality rates of A. scoparia in habitats of both aeolian sandy soil and sierozem soil fluctuated greatly. There was no significant difference in the effects of increased and decreased precipitation treatments on the mortality rate of A. scoparia. Soil types had significant effects on all parameters, including the plant height, crown width, density, cover, and biomass of A. scoparia. Precipitation treatments had significant impacts on plant height, crown width and coverage of A. scoparia, and had no significant effect on plant density and biomass. The interactions between soil type and precipitation treatments had only a significant impact on plant height and crown width. The plasticity index of biomass in the habitat of bedrock weathered sedimentary soil was significantly higher than that in habitats of aeolian sandy soil and sierozem soil, while the plasticity index of plant coverage in the habitats of both sierozem soil and bedrock weathered sedimentary soil were significantly higher than that in the habitat of aeolian sandy soil. The density plasticity index of increased precipitation treatment was significantly higher than those of CK and the decreased precipitation treatments. The plasticity index of plant height and crown width were higher than other parameters, indicating that A. scoparia could respond to habitat changes by giving priority to these two parameters under different habitat pressures.