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一、材料与方法 试验林设在湖南省汉寿县和常德县丘陵地区,试验地坡度平缓,土壤系第四纪红色粘土发育而成的红壤。pH值5.1～5.6,结构紧密,总孔隙度一般在50％以下,养分含量低,有机质一般在2％以下,全量氮在0.1％至0.15％,速效氮在30～50PPM,速效磷在10PPM以下。林木生长势差。试验林多为多代萌芽或落籽成林,品种混杂,寒露类型占90％以上。管理粗放,试验前一般3～5年垦复一次,病害严重,常年亩产油量3～4kg,根据上述情
I. Materials and Methods The experimental forests were set up in the hilly areas of Hanshou County and Changde County in Hunan Province. The test slopes were gentle, and the soil was red soil developed from Quaternary red clay. The pH value of 5.1 ~ 5.6, compact structure, the total porosity is generally below 50%, low nutrient content, organic matter generally below 2%, total nitrogen in 0.1% to 0.15%, available nitrogen in 30 ~ 50PPM, available phosphorus in 10PPM below . Forest growth potential difference. The experimental forest is mostly multi-generation sprout or fall seed into forests, varieties mixed, cold dew types accounted for more than 90%. Extensive management, before the test generally 3 to 5 years reclamation once, serious disease, perennial mu yield 3 ~ 4kg, according to the above situation