C, N, P ecological stoichiometry characteristics of Leymus chinensis leaves at different grassland degradation succession stages

摘要

Carbon, nitrogen and phosphorus are important elements in biogeochemical cycles, they play an important role in the ecosystem, the study about the ecological stoichiometry for C, N and P in the plant leaves is a hot topic of ecological field. The characteristics of ecological stoichiometry are explored by studying the content of C, N and P in the leaves of Leymus chinense at different succession stages of grassland degradation from the Jiangjiadian grassland in Da'an city in western Jilin Province. The results show that the maximum C content appears in lightly degraded grassland, and the minimum C content appears in the very seriously degraded grassland. However, the maximum N content appears in the very seriously degraded grassland, and the minimum N content appears in the undegraded grassland. The maximum P content appears in the very seriously degraded grassland, and the minimum P content appears in the moderate degraded grassland. The maximum value of C: N appears in the undegraded grassland, the minimum value of C: N appears in the very seriously degraded grassland. The maximum value of C: P appears in the moderate degraded grassland, the minimum value of C: P appears in the undegraded grassland. The maximum value of N: P appears in the seriously degraded grassland, the minimum value of N: P appears in the undegraded grassland. The undegraded grassland is limited by both N and P; the degraded grassland is limited by P. The ecological stoichiometry characteristic provide useful guidance on different degradation succession Stages.