Structural features of Lycium ruthenicum communities and associated soil characteristics on different types of desert rangeland in the lower reaches of the Shiyang River
The species composition and soil characteristics of black wolfberry communities in four different types of desert rangeland (loose sand dunes, salt flats, gravels, vegetated or semi-vegetated dunes) in the lower reaches of the Shiyang river were studied. Key content of this paper includes: 1) Among the plant communities investigated, there were 31 species (12 shrub plants, 8 perennial herbs and 11 annual herbs) belonging to 9 families and 28 genera. Hence the community structure at each studied site typically comprised a few families represented by a single taxon from one or more genera. Lycium ruthenicum had a dominance role in each of the 4 communities with ‘importance values’ of 58. 9%, 17. 6% , 18. 2% and 38. 1% , respectively, for the above 4 site categories. Only at the gravel flats site was another species more important (Setaria viridis, 28. 9%). 2) A range of soil chemical properties are tabulated for 0-10 cm. 10-20 cm. 20-40 cm, and 40- 60 cm soil depths. Soil organic C for the 0-10 cm soil depth was 0. 30%, 1. 08%, 0. 29%, and 0. 37% (mean s. e. ±0. 05%) , respectively, for loose dune, salt flat, gravel and vegetated dune sites. The measured soil properties generally did not vary significantly with soil depth, but along with SOC, soil total P and available K were markedly higher in saline flats than at the other site categories.3) Site rankings for soil microbial biomass were saline soil (-300mg.kg-l>loose>sand>vegetated dunes>gravel ( -125 mg . kg-'). Soil enzyme activities are reported for the 4 soil depths for catalase, sucrose, urease, phosphatase and invertase, and were highest in the saline soil in each case. 4) There was a significant positive correlation between soil organic matter and microbial biomass carbon, microbial biomass nitrogen, phosphatase and sucrase (P<O. 01), and a significant positive correlation with urease and catalase (P<0. 05). Phosphorus content was significantly positively correlated with urease,phosphatase and invertase (P<O. 01) , and positively correlated with microbial biomass carbon (P<0. 05). Soil available potassium content was significantly positively correlated with microbial biomass nitrogen and phosphatase ( P<0. 01).
the lower reaches of Shiyang Riverdesert rangelandLycium. ruthenicum. communityvegetation structural featuressoil characteristics
国家科技期刊平台
NSTL
万方数据
维普
