Effect of Stellera chamaejasme removal on the nutrient resorption of plants in an alpine grassland community

doi:10.11686/cyxb2019548

Abstract

Abstract: Control of Stellera chamaejasme is one of the main methods used to promote recovery of degraded grasslands in the Qinghai-Tibetan Plateau. Limited studies have been conducted on the nutrient resorption of plants during this recovery period. This study investigated the effects of S. chamaejasme removal (SR) on the nutrient resorption efficiency (NuR) from species level, to functional group level, and to community level of the alpine grassland ecosystem. It was found that: At the species level, SR decreased NuR (Nirogen, N) of Poa alpigena and Festuca ovina; SR decreased NuR (Phosphorus, P) of P. alpigena and Stipa aliena, but increased NuR (P) of Koeleria litvinowii, Kobresia capillifolia and Kobresia humilis. At the functional group level, SR induced increased N content in green and senesced leaves of forbs, and the decline of NuR (N) in forbs. The NuR (N) and NuR (P) of Poaceae and Fabaceae all decreased after SR treatment, however, the NuR (P) of sedges increased after SR. At the community level, N content of green leaves and P content of senesced leaves were significantly lower, but the NuR (P) was significantly higher in the SR treatment, compared to CK. In conclusion, different species and functional groups have different NuR responses to SR, but SR promoted P use efficiency at the plant community level. These results may provide basic data for the study of nutrient utilization mechanisms in the recovery of degraded grassland, and provide a theoretical framework for developing effective and sustainable measures for S. chamaejasme control in the Qinghai-Tibetan Plateau.

Key words: Stellera chamaejasme, nutrient resorption, alpine grassland, removal, community

SONG Mei-ling, WANG Yu-qin, BAO Gen-sheng, WANG Hong-sheng. Effect of Stellera chamaejasme removal on the nutrient resorption of plants in an alpine grassland community[J]. Acta Prataculturae Sinica, 2020, 29(10): 47-57.

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