The role of the locoweed (Astragalus variabilis Bunge) in improving the soil properties of desert grasslands
文献类型： 外文期刊
作者： Wang, Qinghai 1 ; Chen, Chao 1 ; Pang, Zhuo 1 ; Li, Cui 1 ; Wang, Dejun 2 ; Ma, Qingcheng 3 ; Wu, Juying 1 ;
作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Res & Dev Ctr Grass & Environm, Beijing 100097, Peoples R China
2.Tenggeli Anim Hlth Supervis Stn, Alxa League 751799, Inner Mongolia, Peoples R China
3.Jilantai Anim Hlth Supervis Stn, Alxa League 750333, Inner Mongolia, Peoples R China
关键词： Astragalus; poisonous plants; rangeland; soil texture; soil available nutrient; soil microbial biomass
期刊名称：RANGELAND JOURNAL （ 影响因子：1.089； 五年影响因子：1.306 ）
ISSN： 1036-9872
年卷期：
页码：
收录情况： SCI
摘要： Astragalus variabilis Bunge is a widespread locoweed that threatens livestock production in desert grassland. No research has reported its possible ecological functions due to focus being on its negative effect on livestock production. This study aimed to assess the effects of A. variabilis on soil properties and its possible role in improving soil quality in desert grassland. Soil samples were collected in Astragalus patches and the adjacent bare patches over two successive growing seasons in Alxa desert grassland where A. variabilis was favoured to spread. Soil properties including texture, water content, dry bulk density, porosity, available nutrients, organic matter, and soil microbial biomass were determined at 15 study sites. There was no significant difference in soil texture between Astragalus-dominant and bare patches; but organic matter (OM), available N and P, and microbial biomass in surface soil (0-30 cm) were significantly higher in Astragalus patches. Furthermore, microbial biomass showed a significantly positive correlation with available nutrients and OM. Levels of water soluble salt were significantly lower in A. variabilis surface soils under drought conditions. Results suggested that A. variabilis was associated with some positive changes in soil properties, and was potentially important in improving soil chemical and microbial properties in desert grassland ecosystems. Consequently, total elimination of locoweed should not necessarily be considered the best solution to locoweed poisoning in livestock.
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