石漠化区不同利用类型土地养分的含量及其生态化学计量特征.

【Objective】 The aim of this paper is to provide a reference for scientific, reasonable and efficient utilization of land resources in dry-hot valley stony desertification area of Guizhou. 【Method】 The SOC, TN, TP and TK content of soil samples with 0-20 cm depth from six typical soil plots of Hylocereus undulatus, Lonicera japonica, Juglans regia, Tectona grandis, Zea mays and Zanthoxylum bugeanum in dryhot valley stony desertification area of Guizhou was determined and then the ecological stoichiometric characteristics of C, N, P and K in soils was statistically analyzed by using the ecological stoichiometric method. 【Result】 The average content of SOC, TN, TP and TK in soil samples with 0-20 cm depth from six typical soil plots is 19.16-70.17, 1.69-6.79, 0.06-3.12 and 8.60-77.04 g/kg respectively. The ratio of C:N, C:P, N:P, C:K, N:K and P:K is 6.318-21.028, 11.400-552.310, 1.804-46.354, 0.461-5.651, 0.073-0.502 and 0.003-0.040 separately. The SOC content of soil is significantly and positively correlated with C:K and P:K. The TN content of soil is significantly and positively correlated with P:K, and significantly and negatively correlated with C:N and C:P. The TP content of soil is significantly and positively correlated with P:K, and very significantly and negatively correlated with C:P and N:P. The TK content of soil is very significantly and positively correlated with P:K, very significantly and negatively correlated with C:P and N:P, and significantly and negatively correlated with C :K. The SOC has the promotion effect on C:K and N:K. The TN, TP and TK content of soil has the promotion effect on P:K in soil also. The TN, TP and TK content in soil has the inhibition effect on C:N and C:P, C:P and N:P, and C:P, N:P and C:K respectively. In addition to the S function between C:K and N:P, there is a unitary quadratic function relationship between different ecological stoichiometric ratios. 【Conclusion】 The soil fertility can be improved by applying exogenous P fertilizer in agricultural production because the quicker decomposition of organic matter in soil speeds up consumption of soil nutrients and results in TP deficiency of soil in dry-hot valley stony desertification area. The combined application pattern of organic manure and inorganic fertilizer should be used in management of soil nutrients in dry-hot valley stony desertification area. [ABSTRACT FROM AUTHOR]