Soil stoichiometry characteristics of alpine meadow at its different degradation stages
To clarify the soil stoichiometry characteristics of alpine meadow at its different degradation stages, the native Kobresia meadow, mildly degraded meadow, and seriously degraded sandy meadow were selected to measure their soil organic carbon ( SOC ) , total nitrogen ( N) , total phosphorous (P) , and total potassium (K) contents at different soil depths. With the degradation of alpine meadow, the SOC, N, P, K, C : N, C : P, C : K, N : P, N : K, and P : K in 0-100 cm profiles presently a decreasing trend, and SOC was most sensitive to the degradation, followed by total N, P, and K. The SOC and N in top (0-20 cm) soil could be used as the most sensitive indicators for the degradation degree of alpine meadow. The vertical distribution of SOC, N, P, and K differed with the degradation stage of the alpine meadow. For native Kobresia meadow and mildly degraded meadow, the SOC ,N,P,K,C:N,C:P,C:K,N; P, N : K, and P : K in 0-40 cm soil layer decreased sharply with soil depth, but those in 40-100 cm soil layer had a slow decrease and tended to be stable; for seriously degraded sandy meadow, these stoichiometry characteristics remained unchanged with soil depth.
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