Journal of Food, Agriculture and Environment

Response of fine root growth and nitrogen and phosphorus contents to soil freezing in Calamagrostis angustifolia wetland, Sanjiang Plain, Northeast China 

Author(s):

Zhaoqing Luan, Huicong Cao *

Recieved Date: 2012-06-29, Accepted Date: 2012-10-01

Abstract:

Effects of freezing on the fine roots growth as well as the contents of nitrogen (N) and phosphorus (P) in Calamagrostis angustifolia wetland, the Sanjiang Plain in Northeast China were studied by using snow removal treatment and root in-growth core methods. The results indicate that the seasonal dynamics of the root production in Calamagrostis angustifolia wetland shows single peak, and the maximum value was 519.47±152.17g m^-2 in August. The percentages of fine root production in the belowground biomass (0-10 cm) were 50.5%, 55.9%, 25.1% and 22.5% in four months from July to October, respectively. During the growing season, the mean value of the fine root production is 404.88±81.28 g m^-2 for the CK treament and 368.13±122.97 g m^-2 for the snow treatment, respectively. Freezing alters the dynamics and production of the fine roots. For the CK treatment, the total nitrogen (TN) content in the fine roots is 7001.61±1175.20 mg kg^-1 which is not significantly different with that of the snow treatment with 6708.10±902.88 mg kg^-1; and the total phosphorus (TP) contents are 2084.19±273.87 mg kg^-1 and 2511.04±294.39 mg kg^-1 for the CK and snow treatment, respectively, and the monthly TP content of the snow treatment is higher than that of the CK treatment. The N storage in the CK treatment is higher than that in the snow treatment, while the P storage in the snow treatment is higher, but the difference is not significant. For both the treatments, the fine roots production significantly correlated with the storages of N and P (p<0.05). It indicates that increased frequency of soil freezing caused by the global climate change has a great effect on the nutrient cycling of the wetland system in the north.

Keywords:

Soil freezing, fine root production, N and P contents, Calamagrostis angustifolia, wetland system, northern wetland, Sanjiang Plain, Northeast China

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Environment
Pages: 1495-1499

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