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我国四川、广东等十四个省(区)都有大面积的马尾松飞播林分,因此,进行马尾松飞播林分抚育间伐定位试验,进而选择最优间伐方案,对理论研究和指导生产实践都有重要作用。该试验研究系四川农业大学林学系主持的《马尾松中幼林抚育间伐技术研究》科研课题的子项目之一,由巫山县林业局承担。经过5年的试验研究,已获初步成果。一、试验区概况试验区设在四川省巫山县飞播管理林场的错开峡播区。其地理座标约为东经109°59′,北纬30°48′。海拔高900—1,100米。年均降水量1,283毫米,年均降水日数129天,年均相对湿度77%。年均气温13.6℃,绝对最高气温37℃,绝对最低气温-11.7℃,≥10℃活动积温4,041℃,无霜期235天。土壤为发育在石灰岩上的
China’s Sichuan, Guangdong and other fourteen provinces (regions) have a large area of aerial plantation of P. massoniana, therefore, aerial seeding masson pine interval positioning test, and then select the optimal program of thinning, the theoretical study and guidance of production practices Have an important role. The pilot study of Sichuan Agricultural University, Department of Forestry chaired the “masson pine young tree tending thinning technology research project” one of the subprojects, by the Wushan Forestry Bureau. After five years of experimental research, preliminary results have been obtained. First, the pilot area Survey The pilot area is located in Wushan County, Sichuan Province, airborne forest management staggered Gorge. Its geographical coordinates are about 109 ° 59’E and 30 ° 48’N. 900-1,100 meters above sea level. The average annual rainfall of 1,283 mm, the average annual precipitation days 129 days, with an average annual relative humidity of 77%. The average annual temperature of 13.6 ℃, the absolute maximum temperature of 37 ℃, the absolute minimum temperature of -11.7 ℃, ≥ 10 ℃ active accumulated temperature 4,041 ℃, frost-free period of 235 days. Soil is developed on limestone