滩地人工林营林措施对钉螺种群的影响

通过对滩地不同经营措施的杨树人工林内钉螺种群影响的长期定位观测和分析研究,结果显示:①在低海拔淹水时间达60天的滩地,采用挖沟抬垄整地是确保人工林营造成功和有效抑螺的重要措施;②在幼林阶段,采用林农复合经营是抑螺防病林经营的有效措施;③随着林木的生长,树木对林地环境的改善强度加大,其对钉螺种群的抑制效果逐渐加强,使钉螺种群密度保持较低的水平。因此,对钉螺滋生的滩地采取针对性的造林技术和措施,即可增加林地的经济产出,更为重要的是可有效抑制钉螺的种群数量,同时辅以对家畜的管理,可使林地内的感染性钉螺降至零,达到了滩地利用与抑制钉螺的双重目标。

Influences of Afforestation on Population of Oncamelania hupensis in the Beach

Based on long-term observation of Oncamelania hupensis in the beaches of Dongting Lake, the influences of afforestation on its population was analyzed. Results indicated that: 1) ditching for drainage was an effective way for successful tree planting and snails control at sites submerged for 60 days; 2) agroforestry management was an important system during the juvenile period of the plantations; 3) the population density of Oncamelania hupensis was kept at low level due to improved forest environment which suppresses Oncamelania hupensis population when trees grow up.