图3. 黔西南枯落物和土壤化学性质与胞外酶活性的冗余分析(RDA)。AN, 土壤氨态氮含量; AP, 酸性磷酸酶; BG, β-1, 4-葡萄糖苷酶; BX, β-1,4-木糖苷酶; CBH, 纤维素二糖水解酶; C:N, 土壤碳氮比; C:P, 土壤碳磷比; Enzyme C:N, 胞外酶碳氮比; Enzyme C:P, 胞外酶碳磷比; Enzyme N:P, 胞外酶氮磷比; LC, 枯落物碳含量; LC:P, 枯落物碳磷比; LN, 枯落物氮含量; LAP, 亮氨酸氨基肽酶; LP, 枯落物磷含量; NAG, β-1,4-乙酰-葡糖胺糖苷酶; NN, 土壤硝态氮含量; N:P, 土壤N:P; SAP, 土壤速效磷含量; SOC, 土壤有机碳含量; TN, 土壤总氮含量; TP, 土壤总磷含量。

Fig. 3. Redundancy analysis (RDA) of litter chemical content, soil chemical properties and extracellular enzyme activity in southwestern Guizhou. AN, soil ammoniacal nitrogen content; AP, acid phosphatase; BG, β-1,4-glucosidase; BX, β-1,4-xylosidase; CBH, Cellobiohydrolase; C:N, soil carbon (C):nitrogen (N); C:P, soil C:phosphorus (P); Enzyme C:N, extracellular enzyme C:N; Enzyme C:P, extracellular enzyme C:P; Enzyme N:P, extracellular enzyme N:P; LC, litter C content; LC:P, litter C:P; LN, litter N content; LAP, L-leucine aminopeptidase; LP, litter phosphorus content; NAG, β-1,4-N-acetylglucosaminidase; NN, soil nitrate N content; N:P, soil N:P; SAP, soil available phosphorus content; SOC, soil organic carbon content; TN, soil total nitrogen content; TP, soil total phosphorus content.