加勒比松林地土壤对凋落物的响应

摘要

研究了保留凋落物和去除凋落物的加勒比松林的土壤特性,以了解凋落物对加勒比松林土壤的影响.与去除凋落物的加勒比松林相比,保留凋落物的加勒比松林林木平均胸径和平均树高分别增加了27%和12%,土壤的容重、土壤毛管孔隙度、非毛管孔隙度和总孔隙度无显著变化.保留凋落物土壤的有机质、全N、全K、水解N含量比去除凋落物的加勒比松林分别高66%、48%、12%和160%,全P、速效P和速效K含量变化不明显.保留凋落物林分土壤的细菌、真菌和放线菌数量比去除凋落物林分土壤分别高18%、29%和41%,土壤脲酶、土壤磷酸酶和过氧化氢酶活性分别高1.2、1.1和5.1倍.%The response of soil to litter in a Pinus caribaea woodland in Foshan City was studied in an experiment comparing a P. caribaea stand with and without litter. Results showed that compared with the P.caribaea stand without litter, the mean diameter at breast height (DBH) and mean tree height in the P.caribaea stand with litter significantly increased by 27％ and 12％ ,respectively,whereas its soil bulk density, capillary porosity, non-capillary porosity, total porosity and capillary water did not change significantly. Contents of soil organic matter,total N,total K and alkalized N in the P. caribaea stand with litter were 66％ ,48％ ,12％ and 160％ greater than those in the P. caribaea stand without litter,respectively,whereas contents of total P, available P and available K were close to the latter. Number of bacteria, fungi and actinomyces in the P. caribaea stand with litter were 18％ ,29％ and 41％ greater than those in the P.caribaea stand without litter,respectively,and activities of its urease,acid phosphatase and catalase were 1.2,1.1 and 5.1 times greater than the latter, respectively.