火力楠和红苞木幼林的土壤肥力研究

对选定的火力楠幼林和红苞木幼林的土壤物理性质、土壤养分特点、微生物和酶活性进行了对比研究.结果表明,火力楠林的土壤容重显著小于对照,土壤毛管孔隙和总孔隙的比例及土壤毛管持水量显著大于后者.红苞木林的土壤容重是火力楠林的115%,土壤毛管孔隙、总孔隙的比例及毛管持水量分别为后者85%,87%和76%,而二者的非毛管孔隙相近.2种林分的土壤有机质、全N、全K和水解N含量均显著大于对照,而全P、速效P和速效K含量显著小于后者.二者的土壤pH值相近,均呈强酸性.火力楠林的土壤有机质、全N、全P、全K、水解N、速效P和速效K含量分别为红苞木林的1.29,1.26,1.17,1.02,1.20,1.33和1.51倍.火力楠林的土壤细菌、真菌和放线菌数量及土壤脲酶、磷酸酶和过氧化氢酶活性分别为红苞木林的1.63,1.18,1.72,1.19,1.06和1.24倍;2种林分的3种微生物数量和3种酶活性显著大于对照.

Soil Fertilities of Young Michelia Macclurei and Rhodolcia Championii Stands

The physical characteristics , soil nutrients , microorganism amounts, and enzyme activities of soils were studied in a young Michelia macclurei stand and a young Rhodolcia championii stand .Soil density in the Michelia macclurei stand was significantly smaller than the control , whereas its capillary porosity,total porosity,and capillary moisture capacity were sig nificantly greater than the latter .Soil density in the R hodolcia championii stand was 115 %of that in the Michelia macclurei stand,whereas its capillary porosity,total porosity,and capillary moisture capacity were 85%,87%,and 76%of those of the latter,respectively,and capillary porosity of the two stands was close.The content of soil organic matter,total N,total K,and alkalized N in the tw o stands were sig nificantly greater than the control,whereas their total P,available P,and available K were significantly smaller than the latter .The soils in the two stands were rather strong in acidity .Soil nutrient contents in the Michelia macclurei stand was relatively high and its soil organic matter,total N , total P,total K,alkalized N,available P,and available K were 1.29,1.26,1.17,1.02,1.20,1.33,and 1.51 times those in the R hodolcia championii stand , respectively .The amounts of bacteria, fungi,and actinomyces and the activities of urease,acid phosphatase,and catalase in the Michelia macclurei stand were 1.63,1.18,1.75,1.19,1.06 ,and 1.24 time those of the R hodolcia championii stand,respectively ,and those in the two stands were significantly greater than the co ntrol.