Respond of Soil Nutrient to Plowing and Reseeding of Achnatherum splendens in the Qinghai Lake Region

doi:10.7525/j.issn.1673-5102.2021.02.015

Abstract

Abstract:

In order to explore the vertical variation character of soil nutrients caused by plowing and reseeding treatments， the grassland of Achnatherum splendens was used to analyze the effects of two restoration with plowing in 1958 or reseeding in 1992 nutritional distribution characteristics of 0?10， 10?20， 20?30， 30?40 and 40?60 cm soil in the zone of the Qinghai Lake of the Qinghai-Tibet Plateau. The results showed that the soil organic carbon and the content of total K， the plot under plowing and reseeding disturbance， were significantly higher than natural A.splendens grassland. Both disturbances were beneficial to the shallow layers of soil to enrich available phosphorus and organic carbon nutrients， not to the restoration of total N（P<0.05）. The contents of available K， total N and organic carbon decreased as the depth of the soil increases， but the soil bulk density， soil pH， the content of total P and K were not significantly different among each layers of plowing soil. Compared with the natural group， the content of available N was significantly decreased at each layers of reseeding soil（P<0.01）， but both disturbances caused significantly higher total K content， and significantly lower total N content in the soil 40?60 cm（P<0.05）. Compared with the natural group， there were significantly positive correlation between the contents of total N and K（P<0.05）， not significant correlation between the contents of available P and N after reseeding， both disturbances aroused the negative correlation between the soil nutrients and the soil bulk density. The pH values of the soil decreased significantly after plowing and reseeding， and plowing treatment could concentrate the soil available nutrients in the surface layer. The reseeding treatment accelerated the turnover of soil nutrients， and the increase of output promoted the restoration of aboveground vegetation， Beside the total potassium content. Both disturbances caused the recovery of total nutrients in different soil layers will be an extremely slow process.

Key words: Qinghai Lake, reseeding, plowing, soil nutrient, soil restoration

CLC Number:

S812.2

Tao LIU, Di ZHU, Ting LÜ, Rui-Fang LIANG, Feng LIU, Zi-Lan MA, Yi-Kang LI, Yu-Zhi MA, Xu SU. Respond of Soil Nutrient to Plowing and Reseeding of Achnatherum splendens in the Qinghai Lake Region[J]. Bulletin of Botanical Research, 2021, 41(2): 270-280.

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