湿地松林和加勒比松林的土壤特性研究

Soil Characteristics of Pinus elliottii and Pinus caribaea Stands

研究比较了湿地松Pinus elliottii林和加勒比松Pinus caribaea林的土壤特性.研究表明,湿地松土壤容重略大于加勒比松,土壤毛管孔隙度、总孔隙度和毛管持水量分别比后者小14%、3%和16%,而非毛管孔隙度比后者大9%.湿地松林的土壤有机质、全N、全P、土壤水解N含量分别比加勒比松高170%、90%、71%和27%,而土壤全K和速效K含量分别比后者低30%和14%,二者的速效P含量相近.湿地松土壤细菌、真菌和放线菌数量和脲酶活性分别为加勒比松的1.2、3.8和3.8倍,脲酶活性比后者高43%,而土壤磷酸酶和过氧化氢酶活性分别比后者低15%和8%.

Soil characteristics in Pinus elliottii and Pinus caribaea stands were investigated in order to understand the mechanism of their effects on soils. Results showed that soil bulk density in the P. elliottii stand was slightly greater than that in the P. caribaea stand, and capillary porosity, total porosity and capillary water of the P. elliottii stand were 14% ,3% and 16% greater than the latter,respectively,whereas non-capillary porosity was 9% smaller than the latter. Contents of soil organic matter,total N ,total P and alkalized N in P. elliottii stand were 170% ,90% ,71% and 27% greater than those in the P. caribaea stand, respectively, whereas its total K and available K were 30% and 14% smaller than the latter, and available P content in both stands was close. The numbers of bacteria, fungi and actinomyces, and urease activity in the P. elliottii stand were 1.2,3.8,3.8 times and 43 % greater than those in the P. caribaea stand,respectively,whereas activities of acid phosphatase and catalase were 15% and 8% smaller than the latter, respectively.