连续两年桉树林下间种3种牧草对土壤肥力及地表径流的影响与评价

采用山毛豆（Tephrosia candida）、184柱花草（Styiosanthes guianensis）和桂牧1号杂交象草（ Pennisetun americanum × Pennlsetum purpureum ）×Pennisetum purpureum cv．Mott在桉树林下间种，间种方式有2种：桉树...

Effects and Evaluation of Three Pastures Interplanting in Eucalyptus Plantation for Two Consecutive-Years on Soil Fertility and Runoff

Such 3 pastures as Tephrosia candida , StyIosanthes guianensis and （ Penniseturn arneri- canu x Pennisetumpurpureurn ） x Penniseturn purpureurn cv. Mort were interplanted in Eucalyptus plantation. After 2 years, compared with baseline survey, soil pH, organic matter, total N, total P2O5, available P and exchangeable Mg increased at different levels, ranging from 7.59% to 110.00 % with the density of 3m x 2m. Content of organic matter in A layer of soil averagely increased by 14.47 % than that of Eucalyptus pure plantation, 35.54 % higher than baseline survey. Soil pH, organic matter, total N, total P2O5, available P and exchangeable Mg increased at different levels,ranging from 2.78 % to 135.71% with the density of 6m × 2m. Content of organic matter in A layer of soil averagely increased by 57.45 % than that of Eucalyptus pure plantation, 36.76 % higher than baseline survey. Compared with pure plantation of Eucalyptus, runoff of 2-year-old Eucalyptus plantation interplanted with （Pennisetun arnericanum × Pennisetum purpureum ） x Pennisetum purpureum cv. Mort decreased by 30.82% and 21.07% respectively. The model of growing pasture in Eucalyptus plantation not only increased the content of soil mineral substance, but also improved the growth of Eucalyptus, decreased soil and water erosion and protected ecological environment.