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Effects of Cover Crops on Soil Aggregate Stability, Total Organic Carbon, and Polysaccharides

^a College of Resources and Environmental Science, Shanxi Agricultural Univ., Taigu, Shanxi, P.R. China, 030801
^b Eastern Cereal and Oilseed Research Centre, Agric. and Agri-Food Canada, 960 Carling Ave., K.W. Neatby Building, Ottawa, ON, Canada, K1A 0C6
^c Dep. of Soil Science, 2357 Main Mall, Univ. of British Columbia, Vancouver, BC, Canada, V6T 1Z4

View larger version (20K): [in a new window]   Fig. 1. Means of total organic C content, total and dilute acid-extractable polysaccharides, and total N content in different water-stable aggregate-size classes isolated after cover crop growing period in the field study. Vertical bars represent standard error of the means. The means with same letters above the error bars in the same organic components are not significantly different at p < 0.05. TOC, total organic C; TPS, total polysaccharides; DAEPS, dilute acid-extractable polysaccharides; TN, total N.

View larger version (35K): [in a new window]   Fig. 2. Influence of amendments on soil mean weight diameter after different laboratory incubation times. Vertical bars represent standard error of the means. The means with same letters above the error bars are on the same sampling date not significantly different at p < 0.05.

View larger version (29K): [in a new window]   Fig. 3. Influence of amendments on proportion of 2- to 6-mm water stable aggregates at different laboratory incubation times. Vertical bars represent standard error of the means. The means with same letters above the error bars on the same sampling date are not significantly different at p < 0.05.