A field survey was carried out to determine the plant niche characteristics of degraded Carex moorcroftii steppe in the hinterland region of Qinghai-Tibetan Plateau.The results showed that the important value and niche breadth of C.moorcroftii gradually decreased as the C.moorcroftii steppe degraded,whereas the niche breadth of Kobresia pygmaea in Cyperaceae,Festuca rubra and Poa poophagorum in Gramineae,Oxytropis ochrocephala and Astragalus polycladus in Legume firstly increased and then decreased in the degradation process of C.moorcroftii steppe,and was maximal in lightly and moderately degraded steppe.The important value and niche breadth of Polygonum sibiricum increased with degraded degree of C.moorcroftii steppe.The biggest niche overlap between different plants was different among C.moorcroftii steppes in different degraded degree.The niche overlap between C.moorcroftii and Leontopodinm nanum,Festuca rubra,Polygonum viviparum and K.pygmaea was the biggest in non-degraded,lightly,moderately and highly degraded degree of C.moorcroftii steppe,respectively.The niche overlap between Lancea tibetica and Gentiana farreri was the lowest in moderately degraded degree,while Astragalus polycladus had the lowest coefficient of niche overlap in non-degraded,lightly and highly degraded degree of C.moorcroftii steppe.
NETL
NSTL
万方数据
维普
